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var.c revision 1.5
      1  1.1  cgd /*
      2  1.1  cgd  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
      3  1.1  cgd  * Copyright (c) 1988, 1989 by Adam de Boor
      4  1.1  cgd  * Copyright (c) 1989 by Berkeley Softworks
      5  1.1  cgd  * All rights reserved.
      6  1.1  cgd  *
      7  1.1  cgd  * This code is derived from software contributed to Berkeley by
      8  1.1  cgd  * Adam de Boor.
      9  1.1  cgd  *
     10  1.1  cgd  * Redistribution and use in source and binary forms, with or without
     11  1.1  cgd  * modification, are permitted provided that the following conditions
     12  1.1  cgd  * are met:
     13  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
     14  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     15  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     17  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     18  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     19  1.1  cgd  *    must display the following acknowledgement:
     20  1.1  cgd  *	This product includes software developed by the University of
     21  1.1  cgd  *	California, Berkeley and its contributors.
     22  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     23  1.1  cgd  *    may be used to endorse or promote products derived from this software
     24  1.1  cgd  *    without specific prior written permission.
     25  1.1  cgd  *
     26  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  1.1  cgd  * SUCH DAMAGE.
     37  1.1  cgd  */
     38  1.1  cgd 
     39  1.1  cgd #ifndef lint
     40  1.5  cgd /* from: static char sccsid[] = "@(#)var.c	5.7 (Berkeley) 6/1/90"; */
     41  1.5  cgd static char *rcsid = "$Id: var.c,v 1.5 1994/03/05 00:35:17 cgd Exp $";
     42  1.1  cgd #endif /* not lint */
     43  1.1  cgd 
     44  1.1  cgd /*-
     45  1.1  cgd  * var.c --
     46  1.1  cgd  *	Variable-handling functions
     47  1.1  cgd  *
     48  1.1  cgd  * Interface:
     49  1.1  cgd  *	Var_Set	  	    Set the value of a variable in the given
     50  1.1  cgd  *	    	  	    context. The variable is created if it doesn't
     51  1.1  cgd  *	    	  	    yet exist. The value and variable name need not
     52  1.1  cgd  *	    	  	    be preserved.
     53  1.1  cgd  *
     54  1.1  cgd  *	Var_Append	    Append more characters to an existing variable
     55  1.1  cgd  *	    	  	    in the given context. The variable needn't
     56  1.1  cgd  *	    	  	    exist already -- it will be created if it doesn't.
     57  1.1  cgd  *	    	  	    A space is placed between the old value and the
     58  1.1  cgd  *	    	  	    new one.
     59  1.1  cgd  *
     60  1.1  cgd  *	Var_Exists	    See if a variable exists.
     61  1.1  cgd  *
     62  1.1  cgd  *	Var_Value 	    Return the value of a variable in a context or
     63  1.1  cgd  *	    	  	    NULL if the variable is undefined.
     64  1.1  cgd  *
     65  1.5  cgd  *	Var_Subst 	    Substitute named variable, or all variables if
     66  1.5  cgd  *			    NULL in a string using
     67  1.1  cgd  *	    	  	    the given context as the top-most one. If the
     68  1.1  cgd  *	    	  	    third argument is non-zero, Parse_Error is
     69  1.1  cgd  *	    	  	    called if any variables are undefined.
     70  1.1  cgd  *
     71  1.1  cgd  *	Var_Parse 	    Parse a variable expansion from a string and
     72  1.1  cgd  *	    	  	    return the result and the number of characters
     73  1.1  cgd  *	    	  	    consumed.
     74  1.1  cgd  *
     75  1.1  cgd  *	Var_Delete	    Delete a variable in a context.
     76  1.1  cgd  *
     77  1.1  cgd  *	Var_Init  	    Initialize this module.
     78  1.1  cgd  *
     79  1.1  cgd  * Debugging:
     80  1.1  cgd  *	Var_Dump  	    Print out all variables defined in the given
     81  1.1  cgd  *	    	  	    context.
     82  1.1  cgd  *
     83  1.1  cgd  * XXX: There's a lot of duplication in these functions.
     84  1.1  cgd  */
     85  1.1  cgd 
     86  1.1  cgd #include    <ctype.h>
     87  1.1  cgd #include    "make.h"
     88  1.1  cgd #include    "buf.h"
     89  1.1  cgd 
     90  1.1  cgd /*
     91  1.1  cgd  * This is a harmless return value for Var_Parse that can be used by Var_Subst
     92  1.1  cgd  * to determine if there was an error in parsing -- easier than returning
     93  1.1  cgd  * a flag, as things outside this module don't give a hoot.
     94  1.1  cgd  */
     95  1.1  cgd char 	var_Error[] = "";
     96  1.1  cgd 
     97  1.1  cgd /*
     98  1.1  cgd  * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
     99  1.1  cgd  * set false. Why not just use a constant? Well, gcc likes to condense
    100  1.1  cgd  * identical string instances...
    101  1.1  cgd  */
    102  1.5  cgd static char	varNoError[] = "";
    103  1.1  cgd 
    104  1.1  cgd /*
    105  1.1  cgd  * Internally, variables are contained in four different contexts.
    106  1.1  cgd  *	1) the environment. They may not be changed. If an environment
    107  1.1  cgd  *	    variable is appended-to, the result is placed in the global
    108  1.1  cgd  *	    context.
    109  1.1  cgd  *	2) the global context. Variables set in the Makefile are located in
    110  1.1  cgd  *	    the global context. It is the penultimate context searched when
    111  1.1  cgd  *	    substituting.
    112  1.1  cgd  *	3) the command-line context. All variables set on the command line
    113  1.1  cgd  *	   are placed in this context. They are UNALTERABLE once placed here.
    114  1.1  cgd  *	4) the local context. Each target has associated with it a context
    115  1.1  cgd  *	   list. On this list are located the structures describing such
    116  1.1  cgd  *	   local variables as $(@) and $(*)
    117  1.1  cgd  * The four contexts are searched in the reverse order from which they are
    118  1.1  cgd  * listed.
    119  1.1  cgd  */
    120  1.1  cgd GNode          *VAR_GLOBAL;   /* variables from the makefile */
    121  1.1  cgd GNode          *VAR_CMD;      /* variables defined on the command-line */
    122  1.1  cgd 
    123  1.1  cgd #define FIND_CMD	0x1   /* look in VAR_CMD when searching */
    124  1.1  cgd #define FIND_GLOBAL	0x2   /* look in VAR_GLOBAL as well */
    125  1.1  cgd #define FIND_ENV  	0x4   /* look in the environment also */
    126  1.1  cgd 
    127  1.1  cgd typedef struct Var {
    128  1.1  cgd     char          *name;	/* the variable's name */
    129  1.1  cgd     Buffer	  val;	    	/* its value */
    130  1.1  cgd     int	    	  flags;    	/* miscellaneous status flags */
    131  1.1  cgd #define VAR_IN_USE	1   	    /* Variable's value currently being used.
    132  1.1  cgd 				     * Used to avoid recursion */
    133  1.1  cgd #define VAR_FROM_ENV	2   	    /* Variable comes from the environment */
    134  1.1  cgd #define VAR_JUNK  	4   	    /* Variable is a junk variable that
    135  1.1  cgd 				     * should be destroyed when done with
    136  1.1  cgd 				     * it. Used by Var_Parse for undefined,
    137  1.1  cgd 				     * modified variables */
    138  1.1  cgd }  Var;
    139  1.1  cgd 
    140  1.5  cgd typedef struct {
    141  1.5  cgd     char    	  *lhs;	    /* String to match */
    142  1.5  cgd     int	    	  leftLen;  /* Length of string */
    143  1.5  cgd     char    	  *rhs;	    /* Replacement string (w/ &'s removed) */
    144  1.5  cgd     int	    	  rightLen; /* Length of replacement */
    145  1.5  cgd     int	    	  flags;
    146  1.5  cgd #define VAR_SUB_GLOBAL	1   /* Apply substitution globally */
    147  1.5  cgd #define VAR_MATCH_START	2   /* Match at start of word */
    148  1.5  cgd #define VAR_MATCH_END	4   /* Match at end of word */
    149  1.5  cgd #define VAR_NO_SUB	8   /* Substitution is non-global and already done */
    150  1.5  cgd } VarPattern;
    151  1.5  cgd 
    152  1.5  cgd static int VarCmp __P((Var *, char *));
    153  1.5  cgd static Var *VarFind __P((char *, GNode *, int));
    154  1.5  cgd static void VarAdd __P((char *, char *, GNode *));
    155  1.5  cgd static Boolean VarHead __P((char *, Boolean, Buffer));
    156  1.5  cgd static Boolean VarTail __P((char *, Boolean, Buffer));
    157  1.5  cgd static Boolean VarSuffix __P((char *, Boolean, Buffer));
    158  1.5  cgd static Boolean VarRoot __P((char *, Boolean, Buffer));
    159  1.5  cgd static Boolean VarMatch __P((char *, Boolean, Buffer, char *));
    160  1.5  cgd static Boolean VarSYSVMatch __P((char *, Boolean, Buffer, VarPattern *));
    161  1.5  cgd static Boolean VarNoMatch __P((char *, Boolean, Buffer, char *));
    162  1.5  cgd static Boolean VarSubstitute __P((char *, Boolean, Buffer, VarPattern *));
    163  1.5  cgd static char *VarModify __P((char *, Boolean (*modProc )(), ClientData));
    164  1.5  cgd static int VarPrintVar __P((Var *));
    165  1.5  cgd 
    166  1.1  cgd /*-
    167  1.1  cgd  *-----------------------------------------------------------------------
    168  1.1  cgd  * VarCmp  --
    169  1.1  cgd  *	See if the given variable matches the named one. Called from
    170  1.1  cgd  *	Lst_Find when searching for a variable of a given name.
    171  1.1  cgd  *
    172  1.1  cgd  * Results:
    173  1.1  cgd  *	0 if they match. non-zero otherwise.
    174  1.1  cgd  *
    175  1.1  cgd  * Side Effects:
    176  1.1  cgd  *	none
    177  1.1  cgd  *-----------------------------------------------------------------------
    178  1.1  cgd  */
    179  1.1  cgd static int
    180  1.1  cgd VarCmp (v, name)
    181  1.1  cgd     Var            *v;		/* VAR structure to compare */
    182  1.1  cgd     char           *name;	/* name to look for */
    183  1.1  cgd {
    184  1.1  cgd     return (strcmp (name, v->name));
    185  1.1  cgd }
    186  1.1  cgd 
    187  1.1  cgd /*-
    188  1.1  cgd  *-----------------------------------------------------------------------
    189  1.1  cgd  * VarFind --
    190  1.1  cgd  *	Find the given variable in the given context and any other contexts
    191  1.1  cgd  *	indicated.
    192  1.1  cgd  *
    193  1.1  cgd  * Results:
    194  1.1  cgd  *	A pointer to the structure describing the desired variable or
    195  1.1  cgd  *	NIL if the variable does not exist.
    196  1.1  cgd  *
    197  1.1  cgd  * Side Effects:
    198  1.1  cgd  *	None
    199  1.1  cgd  *-----------------------------------------------------------------------
    200  1.1  cgd  */
    201  1.1  cgd static Var *
    202  1.1  cgd VarFind (name, ctxt, flags)
    203  1.1  cgd     char           	*name;	/* name to find */
    204  1.1  cgd     GNode          	*ctxt;	/* context in which to find it */
    205  1.1  cgd     int             	flags;	/* FIND_GLOBAL set means to look in the
    206  1.1  cgd 				 * VAR_GLOBAL context as well.
    207  1.1  cgd 				 * FIND_CMD set means to look in the VAR_CMD
    208  1.1  cgd 				 * context also.
    209  1.1  cgd 				 * FIND_ENV set means to look in the
    210  1.1  cgd 				 * environment */
    211  1.1  cgd {
    212  1.1  cgd     LstNode         	var;
    213  1.1  cgd     Var		  	*v;
    214  1.1  cgd 
    215  1.1  cgd 	/*
    216  1.1  cgd 	 * If the variable name begins with a '.', it could very well be one of
    217  1.1  cgd 	 * the local ones.  We check the name against all the local variables
    218  1.1  cgd 	 * and substitute the short version in for 'name' if it matches one of
    219  1.1  cgd 	 * them.
    220  1.1  cgd 	 */
    221  1.1  cgd 	if (*name == '.' && isupper(name[1]))
    222  1.1  cgd 		switch (name[1]) {
    223  1.1  cgd 		case 'A':
    224  1.1  cgd 			if (!strcmp(name, ".ALLSRC"))
    225  1.1  cgd 				name = ALLSRC;
    226  1.1  cgd 			if (!strcmp(name, ".ARCHIVE"))
    227  1.1  cgd 				name = ARCHIVE;
    228  1.1  cgd 			break;
    229  1.1  cgd 		case 'I':
    230  1.1  cgd 			if (!strcmp(name, ".IMPSRC"))
    231  1.1  cgd 				name = IMPSRC;
    232  1.1  cgd 			break;
    233  1.1  cgd 		case 'M':
    234  1.1  cgd 			if (!strcmp(name, ".MEMBER"))
    235  1.1  cgd 				name = MEMBER;
    236  1.1  cgd 			break;
    237  1.1  cgd 		case 'O':
    238  1.1  cgd 			if (!strcmp(name, ".OODATE"))
    239  1.1  cgd 				name = OODATE;
    240  1.1  cgd 			break;
    241  1.1  cgd 		case 'P':
    242  1.1  cgd 			if (!strcmp(name, ".PREFIX"))
    243  1.1  cgd 				name = PREFIX;
    244  1.1  cgd 			break;
    245  1.1  cgd 		case 'T':
    246  1.1  cgd 			if (!strcmp(name, ".TARGET"))
    247  1.1  cgd 				name = TARGET;
    248  1.1  cgd 			break;
    249  1.1  cgd 		}
    250  1.1  cgd     /*
    251  1.1  cgd      * First look for the variable in the given context. If it's not there,
    252  1.1  cgd      * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
    253  1.1  cgd      * depending on the FIND_* flags in 'flags'
    254  1.1  cgd      */
    255  1.1  cgd     var = Lst_Find (ctxt->context, (ClientData)name, VarCmp);
    256  1.1  cgd 
    257  1.1  cgd     if ((var == NILLNODE) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
    258  1.1  cgd 	var = Lst_Find (VAR_CMD->context, (ClientData)name, VarCmp);
    259  1.1  cgd     }
    260  1.1  cgd     if (!checkEnvFirst && (var == NILLNODE) && (flags & FIND_GLOBAL) &&
    261  1.1  cgd 	(ctxt != VAR_GLOBAL))
    262  1.1  cgd     {
    263  1.1  cgd 	var = Lst_Find (VAR_GLOBAL->context, (ClientData)name, VarCmp);
    264  1.1  cgd     }
    265  1.1  cgd     if ((var == NILLNODE) && (flags & FIND_ENV)) {
    266  1.1  cgd 	char *env;
    267  1.1  cgd 
    268  1.1  cgd 	if ((env = getenv (name)) != NULL) {
    269  1.1  cgd 	    /*
    270  1.1  cgd 	     * If the variable is found in the environment, we only duplicate
    271  1.1  cgd 	     * its value (since eVarVal was allocated on the stack). The name
    272  1.1  cgd 	     * doesn't need duplication since it's always in the environment
    273  1.1  cgd 	     */
    274  1.1  cgd 	    int	  	len;
    275  1.1  cgd 
    276  1.1  cgd 	    v = (Var *) emalloc(sizeof(Var));
    277  1.1  cgd 	    v->name = name;
    278  1.1  cgd 
    279  1.1  cgd 	    len = strlen(env);
    280  1.1  cgd 
    281  1.1  cgd 	    v->val = Buf_Init(len);
    282  1.1  cgd 	    Buf_AddBytes(v->val, len, (Byte *)env);
    283  1.1  cgd 
    284  1.1  cgd 	    v->flags = VAR_FROM_ENV;
    285  1.1  cgd 	    return (v);
    286  1.1  cgd 	} else if (checkEnvFirst && (flags & FIND_GLOBAL) &&
    287  1.1  cgd 		   (ctxt != VAR_GLOBAL))
    288  1.1  cgd 	{
    289  1.1  cgd 	    var = Lst_Find (VAR_GLOBAL->context, (ClientData)name, VarCmp);
    290  1.1  cgd 	    if (var == NILLNODE) {
    291  1.1  cgd 		return ((Var *) NIL);
    292  1.1  cgd 	    } else {
    293  1.1  cgd 		return ((Var *)Lst_Datum(var));
    294  1.1  cgd 	    }
    295  1.1  cgd 	} else {
    296  1.1  cgd 	    return((Var *)NIL);
    297  1.1  cgd 	}
    298  1.1  cgd     } else if (var == NILLNODE) {
    299  1.1  cgd 	return ((Var *) NIL);
    300  1.1  cgd     } else {
    301  1.1  cgd 	return ((Var *) Lst_Datum (var));
    302  1.1  cgd     }
    303  1.1  cgd }
    304  1.1  cgd 
    305  1.1  cgd /*-
    306  1.1  cgd  *-----------------------------------------------------------------------
    307  1.1  cgd  * VarAdd  --
    308  1.1  cgd  *	Add a new variable of name name and value val to the given context
    309  1.1  cgd  *
    310  1.1  cgd  * Results:
    311  1.1  cgd  *	None
    312  1.1  cgd  *
    313  1.1  cgd  * Side Effects:
    314  1.1  cgd  *	The new variable is placed at the front of the given context
    315  1.1  cgd  *	The name and val arguments are duplicated so they may
    316  1.1  cgd  *	safely be freed.
    317  1.1  cgd  *-----------------------------------------------------------------------
    318  1.1  cgd  */
    319  1.5  cgd static void
    320  1.1  cgd VarAdd (name, val, ctxt)
    321  1.1  cgd     char           *name;	/* name of variable to add */
    322  1.1  cgd     char           *val;	/* value to set it to */
    323  1.1  cgd     GNode          *ctxt;	/* context in which to set it */
    324  1.1  cgd {
    325  1.1  cgd     register Var   *v;
    326  1.1  cgd     int	    	  len;
    327  1.1  cgd 
    328  1.1  cgd     v = (Var *) emalloc (sizeof (Var));
    329  1.1  cgd 
    330  1.1  cgd     v->name = strdup (name);
    331  1.1  cgd 
    332  1.5  cgd     len = val ? strlen(val) : 0;
    333  1.1  cgd     v->val = Buf_Init(len+1);
    334  1.1  cgd     Buf_AddBytes(v->val, len, (Byte *)val);
    335  1.1  cgd 
    336  1.1  cgd     v->flags = 0;
    337  1.1  cgd 
    338  1.1  cgd     (void) Lst_AtFront (ctxt->context, (ClientData)v);
    339  1.1  cgd     if (DEBUG(VAR)) {
    340  1.1  cgd 	printf("%s:%s = %s\n", ctxt->name, name, val);
    341  1.1  cgd     }
    342  1.1  cgd }
    343  1.1  cgd 
    344  1.1  cgd /*-
    345  1.1  cgd  *-----------------------------------------------------------------------
    346  1.1  cgd  * Var_Delete --
    347  1.1  cgd  *	Remove a variable from a context.
    348  1.1  cgd  *
    349  1.1  cgd  * Results:
    350  1.1  cgd  *	None.
    351  1.1  cgd  *
    352  1.1  cgd  * Side Effects:
    353  1.1  cgd  *	The Var structure is removed and freed.
    354  1.1  cgd  *
    355  1.1  cgd  *-----------------------------------------------------------------------
    356  1.1  cgd  */
    357  1.1  cgd void
    358  1.1  cgd Var_Delete(name, ctxt)
    359  1.1  cgd     char    	  *name;
    360  1.1  cgd     GNode	  *ctxt;
    361  1.1  cgd {
    362  1.1  cgd     LstNode 	  ln;
    363  1.1  cgd 
    364  1.1  cgd     if (DEBUG(VAR)) {
    365  1.1  cgd 	printf("%s:delete %s\n", ctxt->name, name);
    366  1.1  cgd     }
    367  1.1  cgd     ln = Lst_Find(ctxt->context, (ClientData)name, VarCmp);
    368  1.1  cgd     if (ln != NILLNODE) {
    369  1.1  cgd 	register Var 	  *v;
    370  1.1  cgd 
    371  1.1  cgd 	v = (Var *)Lst_Datum(ln);
    372  1.1  cgd 	Lst_Remove(ctxt->context, ln);
    373  1.1  cgd 	Buf_Destroy(v->val, TRUE);
    374  1.1  cgd 	free(v->name);
    375  1.1  cgd 	free((char *)v);
    376  1.1  cgd     }
    377  1.1  cgd }
    378  1.1  cgd 
    379  1.1  cgd /*-
    380  1.1  cgd  *-----------------------------------------------------------------------
    381  1.1  cgd  * Var_Set --
    382  1.1  cgd  *	Set the variable name to the value val in the given context.
    383  1.1  cgd  *
    384  1.1  cgd  * Results:
    385  1.1  cgd  *	None.
    386  1.1  cgd  *
    387  1.1  cgd  * Side Effects:
    388  1.1  cgd  *	If the variable doesn't yet exist, a new record is created for it.
    389  1.1  cgd  *	Else the old value is freed and the new one stuck in its place
    390  1.1  cgd  *
    391  1.1  cgd  * Notes:
    392  1.1  cgd  *	The variable is searched for only in its context before being
    393  1.1  cgd  *	created in that context. I.e. if the context is VAR_GLOBAL,
    394  1.1  cgd  *	only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
    395  1.1  cgd  *	VAR_CMD->context is searched. This is done to avoid the literally
    396  1.1  cgd  *	thousands of unnecessary strcmp's that used to be done to
    397  1.1  cgd  *	set, say, $(@) or $(<).
    398  1.1  cgd  *-----------------------------------------------------------------------
    399  1.1  cgd  */
    400  1.1  cgd void
    401  1.1  cgd Var_Set (name, val, ctxt)
    402  1.1  cgd     char           *name;	/* name of variable to set */
    403  1.1  cgd     char           *val;	/* value to give to the variable */
    404  1.1  cgd     GNode          *ctxt;	/* context in which to set it */
    405  1.1  cgd {
    406  1.1  cgd     register Var   *v;
    407  1.1  cgd 
    408  1.1  cgd     /*
    409  1.1  cgd      * We only look for a variable in the given context since anything set
    410  1.1  cgd      * here will override anything in a lower context, so there's not much
    411  1.1  cgd      * point in searching them all just to save a bit of memory...
    412  1.1  cgd      */
    413  1.1  cgd     v = VarFind (name, ctxt, 0);
    414  1.1  cgd     if (v == (Var *) NIL) {
    415  1.1  cgd 	VarAdd (name, val, ctxt);
    416  1.1  cgd     } else {
    417  1.1  cgd 	Buf_Discard(v->val, Buf_Size(v->val));
    418  1.1  cgd 	Buf_AddBytes(v->val, strlen(val), (Byte *)val);
    419  1.1  cgd 
    420  1.1  cgd 	if (DEBUG(VAR)) {
    421  1.1  cgd 	    printf("%s:%s = %s\n", ctxt->name, name, val);
    422  1.1  cgd 	}
    423  1.1  cgd     }
    424  1.1  cgd     /*
    425  1.1  cgd      * Any variables given on the command line are automatically exported
    426  1.1  cgd      * to the environment (as per POSIX standard)
    427  1.1  cgd      */
    428  1.1  cgd     if (ctxt == VAR_CMD) {
    429  1.3  cgd 	setenv(name, val, 1);
    430  1.1  cgd     }
    431  1.1  cgd }
    432  1.1  cgd 
    433  1.1  cgd /*-
    434  1.1  cgd  *-----------------------------------------------------------------------
    435  1.1  cgd  * Var_Append --
    436  1.1  cgd  *	The variable of the given name has the given value appended to it in
    437  1.1  cgd  *	the given context.
    438  1.1  cgd  *
    439  1.1  cgd  * Results:
    440  1.1  cgd  *	None
    441  1.1  cgd  *
    442  1.1  cgd  * Side Effects:
    443  1.1  cgd  *	If the variable doesn't exist, it is created. Else the strings
    444  1.1  cgd  *	are concatenated (with a space in between).
    445  1.1  cgd  *
    446  1.1  cgd  * Notes:
    447  1.1  cgd  *	Only if the variable is being sought in the global context is the
    448  1.1  cgd  *	environment searched.
    449  1.1  cgd  *	XXX: Knows its calling circumstances in that if called with ctxt
    450  1.1  cgd  *	an actual target, it will only search that context since only
    451  1.1  cgd  *	a local variable could be being appended to. This is actually
    452  1.1  cgd  *	a big win and must be tolerated.
    453  1.1  cgd  *-----------------------------------------------------------------------
    454  1.1  cgd  */
    455  1.1  cgd void
    456  1.1  cgd Var_Append (name, val, ctxt)
    457  1.1  cgd     char           *name;	/* Name of variable to modify */
    458  1.1  cgd     char           *val;	/* String to append to it */
    459  1.1  cgd     GNode          *ctxt;	/* Context in which this should occur */
    460  1.1  cgd {
    461  1.1  cgd     register Var   *v;
    462  1.1  cgd 
    463  1.1  cgd     v = VarFind (name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
    464  1.1  cgd 
    465  1.1  cgd     if (v == (Var *) NIL) {
    466  1.1  cgd 	VarAdd (name, val, ctxt);
    467  1.1  cgd     } else {
    468  1.1  cgd 	Buf_AddByte(v->val, (Byte)' ');
    469  1.1  cgd 	Buf_AddBytes(v->val, strlen(val), (Byte *)val);
    470  1.1  cgd 
    471  1.1  cgd 	if (DEBUG(VAR)) {
    472  1.1  cgd 	    printf("%s:%s = %s\n", ctxt->name, name,
    473  1.5  cgd 		   (char *) Buf_GetAll(v->val, (int *)NULL));
    474  1.1  cgd 	}
    475  1.1  cgd 
    476  1.1  cgd 	if (v->flags & VAR_FROM_ENV) {
    477  1.1  cgd 	    /*
    478  1.1  cgd 	     * If the original variable came from the environment, we
    479  1.1  cgd 	     * have to install it in the global context (we could place
    480  1.1  cgd 	     * it in the environment, but then we should provide a way to
    481  1.1  cgd 	     * export other variables...)
    482  1.1  cgd 	     */
    483  1.1  cgd 	    v->flags &= ~VAR_FROM_ENV;
    484  1.1  cgd 	    Lst_AtFront(ctxt->context, (ClientData)v);
    485  1.1  cgd 	}
    486  1.1  cgd     }
    487  1.1  cgd }
    488  1.1  cgd 
    489  1.1  cgd /*-
    490  1.1  cgd  *-----------------------------------------------------------------------
    491  1.1  cgd  * Var_Exists --
    492  1.1  cgd  *	See if the given variable exists.
    493  1.1  cgd  *
    494  1.1  cgd  * Results:
    495  1.1  cgd  *	TRUE if it does, FALSE if it doesn't
    496  1.1  cgd  *
    497  1.1  cgd  * Side Effects:
    498  1.1  cgd  *	None.
    499  1.1  cgd  *
    500  1.1  cgd  *-----------------------------------------------------------------------
    501  1.1  cgd  */
    502  1.1  cgd Boolean
    503  1.1  cgd Var_Exists(name, ctxt)
    504  1.1  cgd     char	  *name;    	/* Variable to find */
    505  1.1  cgd     GNode	  *ctxt;    	/* Context in which to start search */
    506  1.1  cgd {
    507  1.1  cgd     Var	    	  *v;
    508  1.1  cgd 
    509  1.1  cgd     v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
    510  1.1  cgd 
    511  1.1  cgd     if (v == (Var *)NIL) {
    512  1.1  cgd 	return(FALSE);
    513  1.1  cgd     } else if (v->flags & VAR_FROM_ENV) {
    514  1.1  cgd 	Buf_Destroy(v->val, TRUE);
    515  1.1  cgd 	free((char *)v);
    516  1.1  cgd     }
    517  1.1  cgd     return(TRUE);
    518  1.1  cgd }
    519  1.1  cgd 
    520  1.1  cgd /*-
    521  1.1  cgd  *-----------------------------------------------------------------------
    522  1.1  cgd  * Var_Value --
    523  1.1  cgd  *	Return the value of the named variable in the given context
    524  1.1  cgd  *
    525  1.1  cgd  * Results:
    526  1.1  cgd  *	The value if the variable exists, NULL if it doesn't
    527  1.1  cgd  *
    528  1.1  cgd  * Side Effects:
    529  1.1  cgd  *	None
    530  1.1  cgd  *-----------------------------------------------------------------------
    531  1.1  cgd  */
    532  1.1  cgd char *
    533  1.1  cgd Var_Value (name, ctxt)
    534  1.1  cgd     char           *name;	/* name to find */
    535  1.1  cgd     GNode          *ctxt;	/* context in which to search for it */
    536  1.1  cgd {
    537  1.1  cgd     Var            *v;
    538  1.1  cgd 
    539  1.1  cgd     v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
    540  1.1  cgd     if (v != (Var *) NIL) {
    541  1.1  cgd 	return ((char *)Buf_GetAll(v->val, (int *)NULL));
    542  1.1  cgd     } else {
    543  1.1  cgd 	return ((char *) NULL);
    544  1.1  cgd     }
    545  1.1  cgd }
    546  1.1  cgd 
    547  1.1  cgd /*-
    548  1.1  cgd  *-----------------------------------------------------------------------
    549  1.1  cgd  * VarHead --
    550  1.1  cgd  *	Remove the tail of the given word and place the result in the given
    551  1.1  cgd  *	buffer.
    552  1.1  cgd  *
    553  1.1  cgd  * Results:
    554  1.1  cgd  *	TRUE if characters were added to the buffer (a space needs to be
    555  1.1  cgd  *	added to the buffer before the next word).
    556  1.1  cgd  *
    557  1.1  cgd  * Side Effects:
    558  1.1  cgd  *	The trimmed word is added to the buffer.
    559  1.1  cgd  *
    560  1.1  cgd  *-----------------------------------------------------------------------
    561  1.1  cgd  */
    562  1.1  cgd static Boolean
    563  1.1  cgd VarHead (word, addSpace, buf)
    564  1.1  cgd     char    	  *word;    	/* Word to trim */
    565  1.1  cgd     Boolean 	  addSpace; 	/* True if need to add a space to the buffer
    566  1.1  cgd 				 * before sticking in the head */
    567  1.1  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    568  1.1  cgd {
    569  1.1  cgd     register char *slash;
    570  1.1  cgd 
    571  1.5  cgd     slash = strrchr (word, '/');
    572  1.1  cgd     if (slash != (char *)NULL) {
    573  1.1  cgd 	if (addSpace) {
    574  1.1  cgd 	    Buf_AddByte (buf, (Byte)' ');
    575  1.1  cgd 	}
    576  1.1  cgd 	*slash = '\0';
    577  1.1  cgd 	Buf_AddBytes (buf, strlen (word), (Byte *)word);
    578  1.1  cgd 	*slash = '/';
    579  1.1  cgd 	return (TRUE);
    580  1.1  cgd     } else {
    581  1.1  cgd 	/*
    582  1.1  cgd 	 * If no directory part, give . (q.v. the POSIX standard)
    583  1.1  cgd 	 */
    584  1.1  cgd 	if (addSpace) {
    585  1.1  cgd 	    Buf_AddBytes(buf, 2, (Byte *)" .");
    586  1.1  cgd 	} else {
    587  1.1  cgd 	    Buf_AddByte(buf, (Byte)'.');
    588  1.1  cgd 	}
    589  1.1  cgd 	return(TRUE);
    590  1.1  cgd     }
    591  1.1  cgd }
    592  1.1  cgd 
    593  1.1  cgd /*-
    594  1.1  cgd  *-----------------------------------------------------------------------
    595  1.1  cgd  * VarTail --
    596  1.1  cgd  *	Remove the head of the given word and place the result in the given
    597  1.1  cgd  *	buffer.
    598  1.1  cgd  *
    599  1.1  cgd  * Results:
    600  1.1  cgd  *	TRUE if characters were added to the buffer (a space needs to be
    601  1.1  cgd  *	added to the buffer before the next word).
    602  1.1  cgd  *
    603  1.1  cgd  * Side Effects:
    604  1.1  cgd  *	The trimmed word is added to the buffer.
    605  1.1  cgd  *
    606  1.1  cgd  *-----------------------------------------------------------------------
    607  1.1  cgd  */
    608  1.1  cgd static Boolean
    609  1.1  cgd VarTail (word, addSpace, buf)
    610  1.1  cgd     char    	  *word;    	/* Word to trim */
    611  1.1  cgd     Boolean 	  addSpace; 	/* TRUE if need to stick a space in the
    612  1.1  cgd 				 * buffer before adding the tail */
    613  1.1  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    614  1.1  cgd {
    615  1.1  cgd     register char *slash;
    616  1.1  cgd 
    617  1.1  cgd     if (addSpace) {
    618  1.1  cgd 	Buf_AddByte (buf, (Byte)' ');
    619  1.1  cgd     }
    620  1.1  cgd 
    621  1.5  cgd     slash = strrchr (word, '/');
    622  1.1  cgd     if (slash != (char *)NULL) {
    623  1.1  cgd 	*slash++ = '\0';
    624  1.1  cgd 	Buf_AddBytes (buf, strlen(slash), (Byte *)slash);
    625  1.1  cgd 	slash[-1] = '/';
    626  1.1  cgd     } else {
    627  1.1  cgd 	Buf_AddBytes (buf, strlen(word), (Byte *)word);
    628  1.1  cgd     }
    629  1.1  cgd     return (TRUE);
    630  1.1  cgd }
    631  1.1  cgd 
    632  1.1  cgd /*-
    633  1.1  cgd  *-----------------------------------------------------------------------
    634  1.1  cgd  * VarSuffix --
    635  1.1  cgd  *	Place the suffix of the given word in the given buffer.
    636  1.1  cgd  *
    637  1.1  cgd  * Results:
    638  1.1  cgd  *	TRUE if characters were added to the buffer (a space needs to be
    639  1.1  cgd  *	added to the buffer before the next word).
    640  1.1  cgd  *
    641  1.1  cgd  * Side Effects:
    642  1.1  cgd  *	The suffix from the word is placed in the buffer.
    643  1.1  cgd  *
    644  1.1  cgd  *-----------------------------------------------------------------------
    645  1.1  cgd  */
    646  1.1  cgd static Boolean
    647  1.1  cgd VarSuffix (word, addSpace, buf)
    648  1.1  cgd     char    	  *word;    	/* Word to trim */
    649  1.1  cgd     Boolean 	  addSpace; 	/* TRUE if need to add a space before placing
    650  1.1  cgd 				 * the suffix in the buffer */
    651  1.1  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    652  1.1  cgd {
    653  1.1  cgd     register char *dot;
    654  1.1  cgd 
    655  1.5  cgd     dot = strrchr (word, '.');
    656  1.1  cgd     if (dot != (char *)NULL) {
    657  1.1  cgd 	if (addSpace) {
    658  1.1  cgd 	    Buf_AddByte (buf, (Byte)' ');
    659  1.1  cgd 	}
    660  1.1  cgd 	*dot++ = '\0';
    661  1.1  cgd 	Buf_AddBytes (buf, strlen (dot), (Byte *)dot);
    662  1.1  cgd 	dot[-1] = '.';
    663  1.1  cgd 	return (TRUE);
    664  1.1  cgd     } else {
    665  1.1  cgd 	return (addSpace);
    666  1.1  cgd     }
    667  1.1  cgd }
    668  1.1  cgd 
    669  1.1  cgd /*-
    670  1.1  cgd  *-----------------------------------------------------------------------
    671  1.1  cgd  * VarRoot --
    672  1.1  cgd  *	Remove the suffix of the given word and place the result in the
    673  1.1  cgd  *	buffer.
    674  1.1  cgd  *
    675  1.1  cgd  * Results:
    676  1.1  cgd  *	TRUE if characters were added to the buffer (a space needs to be
    677  1.1  cgd  *	added to the buffer before the next word).
    678  1.1  cgd  *
    679  1.1  cgd  * Side Effects:
    680  1.1  cgd  *	The trimmed word is added to the buffer.
    681  1.1  cgd  *
    682  1.1  cgd  *-----------------------------------------------------------------------
    683  1.1  cgd  */
    684  1.1  cgd static Boolean
    685  1.1  cgd VarRoot (word, addSpace, buf)
    686  1.1  cgd     char    	  *word;    	/* Word to trim */
    687  1.1  cgd     Boolean 	  addSpace; 	/* TRUE if need to add a space to the buffer
    688  1.1  cgd 				 * before placing the root in it */
    689  1.1  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    690  1.1  cgd {
    691  1.1  cgd     register char *dot;
    692  1.1  cgd 
    693  1.1  cgd     if (addSpace) {
    694  1.1  cgd 	Buf_AddByte (buf, (Byte)' ');
    695  1.1  cgd     }
    696  1.1  cgd 
    697  1.5  cgd     dot = strrchr (word, '.');
    698  1.1  cgd     if (dot != (char *)NULL) {
    699  1.1  cgd 	*dot = '\0';
    700  1.1  cgd 	Buf_AddBytes (buf, strlen (word), (Byte *)word);
    701  1.1  cgd 	*dot = '.';
    702  1.1  cgd     } else {
    703  1.1  cgd 	Buf_AddBytes (buf, strlen(word), (Byte *)word);
    704  1.1  cgd     }
    705  1.1  cgd     return (TRUE);
    706  1.1  cgd }
    707  1.1  cgd 
    708  1.1  cgd /*-
    709  1.1  cgd  *-----------------------------------------------------------------------
    710  1.1  cgd  * VarMatch --
    711  1.1  cgd  *	Place the word in the buffer if it matches the given pattern.
    712  1.1  cgd  *	Callback function for VarModify to implement the :M modifier.
    713  1.1  cgd  *
    714  1.1  cgd  * Results:
    715  1.1  cgd  *	TRUE if a space should be placed in the buffer before the next
    716  1.1  cgd  *	word.
    717  1.1  cgd  *
    718  1.1  cgd  * Side Effects:
    719  1.1  cgd  *	The word may be copied to the buffer.
    720  1.1  cgd  *
    721  1.1  cgd  *-----------------------------------------------------------------------
    722  1.1  cgd  */
    723  1.1  cgd static Boolean
    724  1.1  cgd VarMatch (word, addSpace, buf, pattern)
    725  1.1  cgd     char    	  *word;    	/* Word to examine */
    726  1.1  cgd     Boolean 	  addSpace; 	/* TRUE if need to add a space to the
    727  1.1  cgd 				 * buffer before adding the word, if it
    728  1.1  cgd 				 * matches */
    729  1.1  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    730  1.1  cgd     char    	  *pattern; 	/* Pattern the word must match */
    731  1.1  cgd {
    732  1.1  cgd     if (Str_Match(word, pattern)) {
    733  1.1  cgd 	if (addSpace) {
    734  1.1  cgd 	    Buf_AddByte(buf, (Byte)' ');
    735  1.1  cgd 	}
    736  1.1  cgd 	addSpace = TRUE;
    737  1.1  cgd 	Buf_AddBytes(buf, strlen(word), (Byte *)word);
    738  1.1  cgd     }
    739  1.1  cgd     return(addSpace);
    740  1.1  cgd }
    741  1.1  cgd 
    742  1.5  cgd 
    743  1.5  cgd 
    744  1.5  cgd /*-
    745  1.5  cgd  *-----------------------------------------------------------------------
    746  1.5  cgd  * VarSYSVMatch --
    747  1.5  cgd  *	Place the word in the buffer if it matches the given pattern.
    748  1.5  cgd  *	Callback function for VarModify to implement the System V %
    749  1.5  cgd  *	modifiers.
    750  1.5  cgd  *
    751  1.5  cgd  * Results:
    752  1.5  cgd  *	TRUE if a space should be placed in the buffer before the next
    753  1.5  cgd  *	word.
    754  1.5  cgd  *
    755  1.5  cgd  * Side Effects:
    756  1.5  cgd  *	The word may be copied to the buffer.
    757  1.5  cgd  *
    758  1.5  cgd  *-----------------------------------------------------------------------
    759  1.5  cgd  */
    760  1.5  cgd static Boolean
    761  1.5  cgd VarSYSVMatch (word, addSpace, buf, pat)
    762  1.5  cgd     char    	  *word;    	/* Word to examine */
    763  1.5  cgd     Boolean 	  addSpace; 	/* TRUE if need to add a space to the
    764  1.5  cgd 				 * buffer before adding the word, if it
    765  1.5  cgd 				 * matches */
    766  1.5  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    767  1.5  cgd     VarPattern 	  *pat; 	/* Pattern the word must match */
    768  1.5  cgd {
    769  1.5  cgd     int len;
    770  1.5  cgd     char *ptr;
    771  1.5  cgd 
    772  1.5  cgd     if (addSpace)
    773  1.5  cgd 	Buf_AddByte(buf, (Byte)' ');
    774  1.5  cgd 
    775  1.5  cgd     addSpace = TRUE;
    776  1.5  cgd 
    777  1.5  cgd     if ((ptr = Str_SYSVMatch(word, pat->lhs, &len)) != NULL)
    778  1.5  cgd 	Str_SYSVSubst(buf, pat->rhs, ptr, len);
    779  1.5  cgd     else
    780  1.5  cgd 	Buf_AddBytes(buf, strlen(word), (Byte *) word);
    781  1.5  cgd 
    782  1.5  cgd     return(addSpace);
    783  1.5  cgd }
    784  1.5  cgd 
    785  1.5  cgd 
    786  1.1  cgd /*-
    787  1.1  cgd  *-----------------------------------------------------------------------
    788  1.1  cgd  * VarNoMatch --
    789  1.1  cgd  *	Place the word in the buffer if it doesn't match the given pattern.
    790  1.1  cgd  *	Callback function for VarModify to implement the :N modifier.
    791  1.1  cgd  *
    792  1.1  cgd  * Results:
    793  1.1  cgd  *	TRUE if a space should be placed in the buffer before the next
    794  1.1  cgd  *	word.
    795  1.1  cgd  *
    796  1.1  cgd  * Side Effects:
    797  1.1  cgd  *	The word may be copied to the buffer.
    798  1.1  cgd  *
    799  1.1  cgd  *-----------------------------------------------------------------------
    800  1.1  cgd  */
    801  1.1  cgd static Boolean
    802  1.1  cgd VarNoMatch (word, addSpace, buf, pattern)
    803  1.1  cgd     char    	  *word;    	/* Word to examine */
    804  1.1  cgd     Boolean 	  addSpace; 	/* TRUE if need to add a space to the
    805  1.1  cgd 				 * buffer before adding the word, if it
    806  1.1  cgd 				 * matches */
    807  1.1  cgd     Buffer  	  buf;	    	/* Buffer in which to store it */
    808  1.1  cgd     char    	  *pattern; 	/* Pattern the word must match */
    809  1.1  cgd {
    810  1.1  cgd     if (!Str_Match(word, pattern)) {
    811  1.1  cgd 	if (addSpace) {
    812  1.1  cgd 	    Buf_AddByte(buf, (Byte)' ');
    813  1.1  cgd 	}
    814  1.1  cgd 	addSpace = TRUE;
    815  1.1  cgd 	Buf_AddBytes(buf, strlen(word), (Byte *)word);
    816  1.1  cgd     }
    817  1.1  cgd     return(addSpace);
    818  1.1  cgd }
    819  1.1  cgd 
    820  1.1  cgd 
    821  1.1  cgd /*-
    822  1.1  cgd  *-----------------------------------------------------------------------
    823  1.1  cgd  * VarSubstitute --
    824  1.1  cgd  *	Perform a string-substitution on the given word, placing the
    825  1.1  cgd  *	result in the passed buffer.
    826  1.1  cgd  *
    827  1.1  cgd  * Results:
    828  1.1  cgd  *	TRUE if a space is needed before more characters are added.
    829  1.1  cgd  *
    830  1.1  cgd  * Side Effects:
    831  1.1  cgd  *	None.
    832  1.1  cgd  *
    833  1.1  cgd  *-----------------------------------------------------------------------
    834  1.1  cgd  */
    835  1.1  cgd static Boolean
    836  1.1  cgd VarSubstitute (word, addSpace, buf, pattern)
    837  1.1  cgd     char    	  	*word;	    /* Word to modify */
    838  1.1  cgd     Boolean 	  	addSpace;   /* True if space should be added before
    839  1.1  cgd 				     * other characters */
    840  1.1  cgd     Buffer  	  	buf;	    /* Buffer for result */
    841  1.1  cgd     register VarPattern	*pattern;   /* Pattern for substitution */
    842  1.1  cgd {
    843  1.1  cgd     register int  	wordLen;    /* Length of word */
    844  1.1  cgd     register char 	*cp;	    /* General pointer */
    845  1.1  cgd 
    846  1.1  cgd     wordLen = strlen(word);
    847  1.1  cgd     if ((pattern->flags & VAR_NO_SUB) == 0) {
    848  1.1  cgd 	/*
    849  1.1  cgd 	 * Still substituting -- break it down into simple anchored cases
    850  1.1  cgd 	 * and if none of them fits, perform the general substitution case.
    851  1.1  cgd 	 */
    852  1.1  cgd 	if ((pattern->flags & VAR_MATCH_START) &&
    853  1.1  cgd 	    (strncmp(word, pattern->lhs, pattern->leftLen) == 0)) {
    854  1.1  cgd 		/*
    855  1.1  cgd 		 * Anchored at start and beginning of word matches pattern
    856  1.1  cgd 		 */
    857  1.1  cgd 		if ((pattern->flags & VAR_MATCH_END) &&
    858  1.1  cgd 		    (wordLen == pattern->leftLen)) {
    859  1.1  cgd 			/*
    860  1.1  cgd 			 * Also anchored at end and matches to the end (word
    861  1.1  cgd 			 * is same length as pattern) add space and rhs only
    862  1.1  cgd 			 * if rhs is non-null.
    863  1.1  cgd 			 */
    864  1.1  cgd 			if (pattern->rightLen != 0) {
    865  1.1  cgd 			    if (addSpace) {
    866  1.1  cgd 				Buf_AddByte(buf, (Byte)' ');
    867  1.1  cgd 			    }
    868  1.1  cgd 			    addSpace = TRUE;
    869  1.1  cgd 			    Buf_AddBytes(buf, pattern->rightLen,
    870  1.1  cgd 					 (Byte *)pattern->rhs);
    871  1.1  cgd 			}
    872  1.1  cgd 		} else if (pattern->flags & VAR_MATCH_END) {
    873  1.1  cgd 		    /*
    874  1.1  cgd 		     * Doesn't match to end -- copy word wholesale
    875  1.1  cgd 		     */
    876  1.1  cgd 		    goto nosub;
    877  1.1  cgd 		} else {
    878  1.1  cgd 		    /*
    879  1.1  cgd 		     * Matches at start but need to copy in trailing characters
    880  1.1  cgd 		     */
    881  1.1  cgd 		    if ((pattern->rightLen + wordLen - pattern->leftLen) != 0){
    882  1.1  cgd 			if (addSpace) {
    883  1.1  cgd 			    Buf_AddByte(buf, (Byte)' ');
    884  1.1  cgd 			}
    885  1.1  cgd 			addSpace = TRUE;
    886  1.1  cgd 		    }
    887  1.1  cgd 		    Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
    888  1.1  cgd 		    Buf_AddBytes(buf, wordLen - pattern->leftLen,
    889  1.1  cgd 				 (Byte *)(word + pattern->leftLen));
    890  1.1  cgd 		}
    891  1.1  cgd 	} else if (pattern->flags & VAR_MATCH_START) {
    892  1.1  cgd 	    /*
    893  1.1  cgd 	     * Had to match at start of word and didn't -- copy whole word.
    894  1.1  cgd 	     */
    895  1.1  cgd 	    goto nosub;
    896  1.1  cgd 	} else if (pattern->flags & VAR_MATCH_END) {
    897  1.1  cgd 	    /*
    898  1.1  cgd 	     * Anchored at end, Find only place match could occur (leftLen
    899  1.1  cgd 	     * characters from the end of the word) and see if it does. Note
    900  1.1  cgd 	     * that because the $ will be left at the end of the lhs, we have
    901  1.1  cgd 	     * to use strncmp.
    902  1.1  cgd 	     */
    903  1.1  cgd 	    cp = word + (wordLen - pattern->leftLen);
    904  1.1  cgd 	    if ((cp >= word) &&
    905  1.1  cgd 		(strncmp(cp, pattern->lhs, pattern->leftLen) == 0)) {
    906  1.1  cgd 		/*
    907  1.1  cgd 		 * Match found. If we will place characters in the buffer,
    908  1.1  cgd 		 * add a space before hand as indicated by addSpace, then
    909  1.1  cgd 		 * stuff in the initial, unmatched part of the word followed
    910  1.1  cgd 		 * by the right-hand-side.
    911  1.1  cgd 		 */
    912  1.1  cgd 		if (((cp - word) + pattern->rightLen) != 0) {
    913  1.1  cgd 		    if (addSpace) {
    914  1.1  cgd 			Buf_AddByte(buf, (Byte)' ');
    915  1.1  cgd 		    }
    916  1.1  cgd 		    addSpace = TRUE;
    917  1.1  cgd 		}
    918  1.1  cgd 		Buf_AddBytes(buf, cp - word, (Byte *)word);
    919  1.1  cgd 		Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
    920  1.1  cgd 	    } else {
    921  1.1  cgd 		/*
    922  1.1  cgd 		 * Had to match at end and didn't. Copy entire word.
    923  1.1  cgd 		 */
    924  1.1  cgd 		goto nosub;
    925  1.1  cgd 	    }
    926  1.1  cgd 	} else {
    927  1.1  cgd 	    /*
    928  1.1  cgd 	     * Pattern is unanchored: search for the pattern in the word using
    929  1.1  cgd 	     * String_FindSubstring, copying unmatched portions and the
    930  1.1  cgd 	     * right-hand-side for each match found, handling non-global
    931  1.1  cgd 	     * subsititutions correctly, etc. When the loop is done, any
    932  1.1  cgd 	     * remaining part of the word (word and wordLen are adjusted
    933  1.1  cgd 	     * accordingly through the loop) is copied straight into the
    934  1.1  cgd 	     * buffer.
    935  1.1  cgd 	     * addSpace is set FALSE as soon as a space is added to the
    936  1.1  cgd 	     * buffer.
    937  1.1  cgd 	     */
    938  1.1  cgd 	    register Boolean done;
    939  1.1  cgd 	    int origSize;
    940  1.1  cgd 
    941  1.1  cgd 	    done = FALSE;
    942  1.1  cgd 	    origSize = Buf_Size(buf);
    943  1.1  cgd 	    while (!done) {
    944  1.1  cgd 		cp = Str_FindSubstring(word, pattern->lhs);
    945  1.1  cgd 		if (cp != (char *)NULL) {
    946  1.1  cgd 		    if (addSpace && (((cp - word) + pattern->rightLen) != 0)){
    947  1.1  cgd 			Buf_AddByte(buf, (Byte)' ');
    948  1.1  cgd 			addSpace = FALSE;
    949  1.1  cgd 		    }
    950  1.1  cgd 		    Buf_AddBytes(buf, cp-word, (Byte *)word);
    951  1.1  cgd 		    Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
    952  1.1  cgd 		    wordLen -= (cp - word) + pattern->leftLen;
    953  1.1  cgd 		    word = cp + pattern->leftLen;
    954  1.1  cgd 		    if (wordLen == 0) {
    955  1.1  cgd 			done = TRUE;
    956  1.1  cgd 		    }
    957  1.1  cgd 		    if ((pattern->flags & VAR_SUB_GLOBAL) == 0) {
    958  1.1  cgd 			done = TRUE;
    959  1.1  cgd 			pattern->flags |= VAR_NO_SUB;
    960  1.1  cgd 		    }
    961  1.1  cgd 		} else {
    962  1.1  cgd 		    done = TRUE;
    963  1.1  cgd 		}
    964  1.1  cgd 	    }
    965  1.1  cgd 	    if (wordLen != 0) {
    966  1.1  cgd 		if (addSpace) {
    967  1.1  cgd 		    Buf_AddByte(buf, (Byte)' ');
    968  1.1  cgd 		}
    969  1.1  cgd 		Buf_AddBytes(buf, wordLen, (Byte *)word);
    970  1.1  cgd 	    }
    971  1.1  cgd 	    /*
    972  1.1  cgd 	     * If added characters to the buffer, need to add a space
    973  1.1  cgd 	     * before we add any more. If we didn't add any, just return
    974  1.1  cgd 	     * the previous value of addSpace.
    975  1.1  cgd 	     */
    976  1.1  cgd 	    return ((Buf_Size(buf) != origSize) || addSpace);
    977  1.1  cgd 	}
    978  1.1  cgd 	/*
    979  1.1  cgd 	 * Common code for anchored substitutions: if performed a substitution
    980  1.1  cgd 	 * and it's not supposed to be global, mark the pattern as requiring
    981  1.1  cgd 	 * no more substitutions. addSpace was set TRUE if characters were
    982  1.1  cgd 	 * added to the buffer.
    983  1.1  cgd 	 */
    984  1.1  cgd 	if ((pattern->flags & VAR_SUB_GLOBAL) == 0) {
    985  1.1  cgd 	    pattern->flags |= VAR_NO_SUB;
    986  1.1  cgd 	}
    987  1.1  cgd 	return (addSpace);
    988  1.1  cgd     }
    989  1.1  cgd  nosub:
    990  1.1  cgd     if (addSpace) {
    991  1.1  cgd 	Buf_AddByte(buf, (Byte)' ');
    992  1.1  cgd     }
    993  1.1  cgd     Buf_AddBytes(buf, wordLen, (Byte *)word);
    994  1.1  cgd     return(TRUE);
    995  1.1  cgd }
    996  1.1  cgd 
    997  1.1  cgd /*-
    998  1.1  cgd  *-----------------------------------------------------------------------
    999  1.1  cgd  * VarModify --
   1000  1.1  cgd  *	Modify each of the words of the passed string using the given
   1001  1.1  cgd  *	function. Used to implement all modifiers.
   1002  1.1  cgd  *
   1003  1.1  cgd  * Results:
   1004  1.1  cgd  *	A string of all the words modified appropriately.
   1005  1.1  cgd  *
   1006  1.1  cgd  * Side Effects:
   1007  1.1  cgd  *	None.
   1008  1.1  cgd  *
   1009  1.1  cgd  *-----------------------------------------------------------------------
   1010  1.1  cgd  */
   1011  1.1  cgd static char *
   1012  1.1  cgd VarModify (str, modProc, datum)
   1013  1.1  cgd     char    	  *str;	    	    /* String whose words should be trimmed */
   1014  1.1  cgd     Boolean    	  (*modProc)();     /* Function to use to modify them */
   1015  1.1  cgd     ClientData	  datum;    	    /* Datum to pass it */
   1016  1.1  cgd {
   1017  1.1  cgd     Buffer  	  buf;	    	    /* Buffer for the new string */
   1018  1.1  cgd     register char *cp;	    	    /* Pointer to end of current word */
   1019  1.1  cgd     char    	  endc;	    	    /* Character that ended the word */
   1020  1.1  cgd     Boolean 	  addSpace; 	    /* TRUE if need to add a space to the
   1021  1.1  cgd 				     * buffer before adding the trimmed
   1022  1.1  cgd 				     * word */
   1023  1.1  cgd 
   1024  1.1  cgd     buf = Buf_Init (0);
   1025  1.1  cgd     cp = str;
   1026  1.1  cgd     addSpace = FALSE;
   1027  1.1  cgd 
   1028  1.5  cgd     for (;;) {
   1029  1.1  cgd 	/*
   1030  1.1  cgd 	 * Skip to next word and place cp at its end.
   1031  1.1  cgd 	 */
   1032  1.1  cgd 	while (isspace (*str)) {
   1033  1.1  cgd 	    str++;
   1034  1.1  cgd 	}
   1035  1.5  cgd 	for (cp = str; *cp != '\0' && !isspace (*cp); cp++)
   1036  1.5  cgd 	    continue;
   1037  1.1  cgd 	if (cp == str) {
   1038  1.1  cgd 	    /*
   1039  1.1  cgd 	     * If we didn't go anywhere, we must be done!
   1040  1.1  cgd 	     */
   1041  1.1  cgd 	    Buf_AddByte (buf, '\0');
   1042  1.1  cgd 	    str = (char *)Buf_GetAll (buf, (int *)NULL);
   1043  1.1  cgd 	    Buf_Destroy (buf, FALSE);
   1044  1.1  cgd 	    return (str);
   1045  1.1  cgd 	}
   1046  1.1  cgd 	/*
   1047  1.1  cgd 	 * Nuke terminating character, but save it in endc b/c if str was
   1048  1.1  cgd 	 * some variable's value, it would not be good to screw it
   1049  1.1  cgd 	 * over...
   1050  1.1  cgd 	 */
   1051  1.1  cgd 	endc = *cp;
   1052  1.1  cgd 	*cp = '\0';
   1053  1.1  cgd 
   1054  1.1  cgd 	addSpace = (* modProc) (str, addSpace, buf, datum);
   1055  1.1  cgd 
   1056  1.1  cgd 	if (endc) {
   1057  1.1  cgd 	    *cp++ = endc;
   1058  1.1  cgd 	}
   1059  1.1  cgd 	str = cp;
   1060  1.1  cgd     }
   1061  1.1  cgd }
   1062  1.1  cgd 
   1063  1.1  cgd /*-
   1064  1.1  cgd  *-----------------------------------------------------------------------
   1065  1.1  cgd  * Var_Parse --
   1066  1.1  cgd  *	Given the start of a variable invocation, extract the variable
   1067  1.1  cgd  *	name and find its value, then modify it according to the
   1068  1.1  cgd  *	specification.
   1069  1.1  cgd  *
   1070  1.1  cgd  * Results:
   1071  1.1  cgd  *	The (possibly-modified) value of the variable or var_Error if the
   1072  1.1  cgd  *	specification is invalid. The length of the specification is
   1073  1.1  cgd  *	placed in *lengthPtr (for invalid specifications, this is just
   1074  1.1  cgd  *	2...?).
   1075  1.1  cgd  *	A Boolean in *freePtr telling whether the returned string should
   1076  1.1  cgd  *	be freed by the caller.
   1077  1.1  cgd  *
   1078  1.1  cgd  * Side Effects:
   1079  1.1  cgd  *	None.
   1080  1.1  cgd  *
   1081  1.1  cgd  *-----------------------------------------------------------------------
   1082  1.1  cgd  */
   1083  1.1  cgd char *
   1084  1.1  cgd Var_Parse (str, ctxt, err, lengthPtr, freePtr)
   1085  1.1  cgd     char    	  *str;	    	/* The string to parse */
   1086  1.1  cgd     GNode   	  *ctxt;    	/* The context for the variable */
   1087  1.1  cgd     Boolean 	    err;    	/* TRUE if undefined variables are an error */
   1088  1.1  cgd     int	    	    *lengthPtr;	/* OUT: The length of the specification */
   1089  1.1  cgd     Boolean 	    *freePtr; 	/* OUT: TRUE if caller should free result */
   1090  1.1  cgd {
   1091  1.1  cgd     register char   *tstr;    	/* Pointer into str */
   1092  1.1  cgd     Var	    	    *v;	    	/* Variable in invocation */
   1093  1.1  cgd     register char   *cp;    	/* Secondary pointer into str (place marker
   1094  1.1  cgd 				 * for tstr) */
   1095  1.1  cgd     Boolean 	    haveModifier;/* TRUE if have modifiers for the variable */
   1096  1.1  cgd     register char   endc;    	/* Ending character when variable in parens
   1097  1.1  cgd 				 * or braces */
   1098  1.1  cgd     char    	    *start;
   1099  1.1  cgd     Boolean 	    dynamic;	/* TRUE if the variable is local and we're
   1100  1.1  cgd 				 * expanding it in a non-local context. This
   1101  1.1  cgd 				 * is done to support dynamic sources. The
   1102  1.1  cgd 				 * result is just the invocation, unaltered */
   1103  1.1  cgd 
   1104  1.1  cgd     *freePtr = FALSE;
   1105  1.1  cgd     dynamic = FALSE;
   1106  1.1  cgd     start = str;
   1107  1.1  cgd 
   1108  1.1  cgd     if (str[1] != '(' && str[1] != '{') {
   1109  1.1  cgd 	/*
   1110  1.1  cgd 	 * If it's not bounded by braces of some sort, life is much simpler.
   1111  1.1  cgd 	 * We just need to check for the first character and return the
   1112  1.1  cgd 	 * value if it exists.
   1113  1.1  cgd 	 */
   1114  1.1  cgd 	char	  name[2];
   1115  1.1  cgd 
   1116  1.1  cgd 	name[0] = str[1];
   1117  1.1  cgd 	name[1] = '\0';
   1118  1.1  cgd 
   1119  1.1  cgd 	v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
   1120  1.1  cgd 	if (v == (Var *)NIL) {
   1121  1.1  cgd 	    *lengthPtr = 2;
   1122  1.1  cgd 
   1123  1.1  cgd 	    if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
   1124  1.1  cgd 		/*
   1125  1.1  cgd 		 * If substituting a local variable in a non-local context,
   1126  1.1  cgd 		 * assume it's for dynamic source stuff. We have to handle
   1127  1.1  cgd 		 * this specially and return the longhand for the variable
   1128  1.1  cgd 		 * with the dollar sign escaped so it makes it back to the
   1129  1.1  cgd 		 * caller. Only four of the local variables are treated
   1130  1.1  cgd 		 * specially as they are the only four that will be set
   1131  1.1  cgd 		 * when dynamic sources are expanded.
   1132  1.1  cgd 		 */
   1133  1.1  cgd 		switch (str[1]) {
   1134  1.1  cgd 		    case '@':
   1135  1.1  cgd 			return("$(.TARGET)");
   1136  1.1  cgd 		    case '%':
   1137  1.1  cgd 			return("$(.ARCHIVE)");
   1138  1.1  cgd 		    case '*':
   1139  1.1  cgd 			return("$(.PREFIX)");
   1140  1.1  cgd 		    case '!':
   1141  1.1  cgd 			return("$(.MEMBER)");
   1142  1.1  cgd 		}
   1143  1.1  cgd 	    }
   1144  1.1  cgd 	    /*
   1145  1.1  cgd 	     * Error
   1146  1.1  cgd 	     */
   1147  1.1  cgd 	    return (err ? var_Error : varNoError);
   1148  1.1  cgd 	} else {
   1149  1.1  cgd 	    haveModifier = FALSE;
   1150  1.1  cgd 	    tstr = &str[1];
   1151  1.1  cgd 	    endc = str[1];
   1152  1.1  cgd 	}
   1153  1.1  cgd     } else {
   1154  1.1  cgd 	endc = str[1] == '(' ? ')' : '}';
   1155  1.1  cgd 
   1156  1.1  cgd 	/*
   1157  1.1  cgd 	 * Skip to the end character or a colon, whichever comes first.
   1158  1.1  cgd 	 */
   1159  1.1  cgd 	for (tstr = str + 2;
   1160  1.1  cgd 	     *tstr != '\0' && *tstr != endc && *tstr != ':';
   1161  1.1  cgd 	     tstr++)
   1162  1.1  cgd 	{
   1163  1.1  cgd 	    continue;
   1164  1.1  cgd 	}
   1165  1.1  cgd 	if (*tstr == ':') {
   1166  1.1  cgd 	    haveModifier = TRUE;
   1167  1.1  cgd 	} else if (*tstr != '\0') {
   1168  1.1  cgd 	    haveModifier = FALSE;
   1169  1.1  cgd 	} else {
   1170  1.1  cgd 	    /*
   1171  1.1  cgd 	     * If we never did find the end character, return NULL
   1172  1.1  cgd 	     * right now, setting the length to be the distance to
   1173  1.1  cgd 	     * the end of the string, since that's what make does.
   1174  1.1  cgd 	     */
   1175  1.1  cgd 	    *lengthPtr = tstr - str;
   1176  1.1  cgd 	    return (var_Error);
   1177  1.1  cgd 	}
   1178  1.1  cgd 	*tstr = '\0';
   1179  1.1  cgd 
   1180  1.1  cgd 	v = VarFind (str + 2, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
   1181  1.1  cgd 	if ((v == (Var *)NIL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
   1182  1.1  cgd 	    ((tstr-str) == 4) && (str[3] == 'F' || str[3] == 'D'))
   1183  1.1  cgd 	{
   1184  1.1  cgd 	    /*
   1185  1.1  cgd 	     * Check for bogus D and F forms of local variables since we're
   1186  1.1  cgd 	     * in a local context and the name is the right length.
   1187  1.1  cgd 	     */
   1188  1.1  cgd 	    switch(str[2]) {
   1189  1.1  cgd 		case '@':
   1190  1.1  cgd 		case '%':
   1191  1.1  cgd 		case '*':
   1192  1.1  cgd 		case '!':
   1193  1.1  cgd 		case '>':
   1194  1.1  cgd 		case '<':
   1195  1.1  cgd 		{
   1196  1.1  cgd 		    char    vname[2];
   1197  1.1  cgd 		    char    *val;
   1198  1.1  cgd 
   1199  1.1  cgd 		    /*
   1200  1.1  cgd 		     * Well, it's local -- go look for it.
   1201  1.1  cgd 		     */
   1202  1.1  cgd 		    vname[0] = str[2];
   1203  1.1  cgd 		    vname[1] = '\0';
   1204  1.1  cgd 		    v = VarFind(vname, ctxt, 0);
   1205  1.1  cgd 
   1206  1.1  cgd 		    if (v != (Var *)NIL) {
   1207  1.1  cgd 			/*
   1208  1.1  cgd 			 * No need for nested expansion or anything, as we're
   1209  1.1  cgd 			 * the only one who sets these things and we sure don't
   1210  1.1  cgd 			 * but nested invocations in them...
   1211  1.1  cgd 			 */
   1212  1.1  cgd 			val = (char *)Buf_GetAll(v->val, (int *)NULL);
   1213  1.1  cgd 
   1214  1.1  cgd 			if (str[3] == 'D') {
   1215  1.1  cgd 			    val = VarModify(val, VarHead, (ClientData)0);
   1216  1.1  cgd 			} else {
   1217  1.1  cgd 			    val = VarModify(val, VarTail, (ClientData)0);
   1218  1.1  cgd 			}
   1219  1.1  cgd 			/*
   1220  1.1  cgd 			 * Resulting string is dynamically allocated, so
   1221  1.1  cgd 			 * tell caller to free it.
   1222  1.1  cgd 			 */
   1223  1.1  cgd 			*freePtr = TRUE;
   1224  1.1  cgd 			*lengthPtr = tstr-start+1;
   1225  1.1  cgd 			*tstr = endc;
   1226  1.1  cgd 			return(val);
   1227  1.1  cgd 		    }
   1228  1.1  cgd 		    break;
   1229  1.1  cgd 		}
   1230  1.1  cgd 	    }
   1231  1.1  cgd 	}
   1232  1.1  cgd 
   1233  1.1  cgd 	if (v == (Var *)NIL) {
   1234  1.1  cgd 	    if ((((tstr-str) == 3) ||
   1235  1.1  cgd 		 ((((tstr-str) == 4) && (str[3] == 'F' ||
   1236  1.1  cgd 					 str[3] == 'D')))) &&
   1237  1.1  cgd 		((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
   1238  1.1  cgd 	    {
   1239  1.1  cgd 		/*
   1240  1.1  cgd 		 * If substituting a local variable in a non-local context,
   1241  1.1  cgd 		 * assume it's for dynamic source stuff. We have to handle
   1242  1.1  cgd 		 * this specially and return the longhand for the variable
   1243  1.1  cgd 		 * with the dollar sign escaped so it makes it back to the
   1244  1.1  cgd 		 * caller. Only four of the local variables are treated
   1245  1.1  cgd 		 * specially as they are the only four that will be set
   1246  1.1  cgd 		 * when dynamic sources are expanded.
   1247  1.1  cgd 		 */
   1248  1.1  cgd 		switch (str[2]) {
   1249  1.1  cgd 		    case '@':
   1250  1.1  cgd 		    case '%':
   1251  1.1  cgd 		    case '*':
   1252  1.1  cgd 		    case '!':
   1253  1.1  cgd 			dynamic = TRUE;
   1254  1.1  cgd 			break;
   1255  1.1  cgd 		}
   1256  1.1  cgd 	    } else if (((tstr-str) > 4) && (str[2] == '.') &&
   1257  1.1  cgd 		       isupper(str[3]) &&
   1258  1.1  cgd 		       ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
   1259  1.1  cgd 	    {
   1260  1.1  cgd 		int	len;
   1261  1.1  cgd 
   1262  1.1  cgd 		len = (tstr-str) - 3;
   1263  1.1  cgd 		if ((strncmp(str+2, ".TARGET", len) == 0) ||
   1264  1.1  cgd 		    (strncmp(str+2, ".ARCHIVE", len) == 0) ||
   1265  1.1  cgd 		    (strncmp(str+2, ".PREFIX", len) == 0) ||
   1266  1.1  cgd 		    (strncmp(str+2, ".MEMBER", len) == 0))
   1267  1.1  cgd 		{
   1268  1.1  cgd 		    dynamic = TRUE;
   1269  1.1  cgd 		}
   1270  1.1  cgd 	    }
   1271  1.1  cgd 
   1272  1.1  cgd 	    if (!haveModifier) {
   1273  1.1  cgd 		/*
   1274  1.1  cgd 		 * No modifiers -- have specification length so we can return
   1275  1.1  cgd 		 * now.
   1276  1.1  cgd 		 */
   1277  1.1  cgd 		*lengthPtr = tstr - start + 1;
   1278  1.1  cgd 		*tstr = endc;
   1279  1.1  cgd 		if (dynamic) {
   1280  1.1  cgd 		    str = emalloc(*lengthPtr + 1);
   1281  1.1  cgd 		    strncpy(str, start, *lengthPtr);
   1282  1.1  cgd 		    str[*lengthPtr] = '\0';
   1283  1.1  cgd 		    *freePtr = TRUE;
   1284  1.1  cgd 		    return(str);
   1285  1.1  cgd 		} else {
   1286  1.1  cgd 		    return (err ? var_Error : varNoError);
   1287  1.1  cgd 		}
   1288  1.1  cgd 	    } else {
   1289  1.1  cgd 		/*
   1290  1.1  cgd 		 * Still need to get to the end of the variable specification,
   1291  1.1  cgd 		 * so kludge up a Var structure for the modifications
   1292  1.1  cgd 		 */
   1293  1.1  cgd 		v = (Var *) emalloc(sizeof(Var));
   1294  1.1  cgd 		v->name = &str[1];
   1295  1.1  cgd 		v->val = Buf_Init(1);
   1296  1.1  cgd 		v->flags = VAR_JUNK;
   1297  1.1  cgd 	    }
   1298  1.1  cgd 	}
   1299  1.1  cgd     }
   1300  1.1  cgd 
   1301  1.1  cgd     if (v->flags & VAR_IN_USE) {
   1302  1.1  cgd 	Fatal("Variable %s is recursive.", v->name);
   1303  1.1  cgd 	/*NOTREACHED*/
   1304  1.1  cgd     } else {
   1305  1.1  cgd 	v->flags |= VAR_IN_USE;
   1306  1.1  cgd     }
   1307  1.1  cgd     /*
   1308  1.1  cgd      * Before doing any modification, we have to make sure the value
   1309  1.1  cgd      * has been fully expanded. If it looks like recursion might be
   1310  1.1  cgd      * necessary (there's a dollar sign somewhere in the variable's value)
   1311  1.1  cgd      * we just call Var_Subst to do any other substitutions that are
   1312  1.1  cgd      * necessary. Note that the value returned by Var_Subst will have
   1313  1.1  cgd      * been dynamically-allocated, so it will need freeing when we
   1314  1.1  cgd      * return.
   1315  1.1  cgd      */
   1316  1.1  cgd     str = (char *)Buf_GetAll(v->val, (int *)NULL);
   1317  1.5  cgd     if (strchr (str, '$') != (char *)NULL) {
   1318  1.5  cgd 	str = Var_Subst(NULL, str, ctxt, err);
   1319  1.1  cgd 	*freePtr = TRUE;
   1320  1.1  cgd     }
   1321  1.1  cgd 
   1322  1.1  cgd     v->flags &= ~VAR_IN_USE;
   1323  1.1  cgd 
   1324  1.1  cgd     /*
   1325  1.1  cgd      * Now we need to apply any modifiers the user wants applied.
   1326  1.1  cgd      * These are:
   1327  1.1  cgd      *  	  :M<pattern>	words which match the given <pattern>.
   1328  1.1  cgd      *  	  	    	<pattern> is of the standard file
   1329  1.1  cgd      *  	  	    	wildcarding form.
   1330  1.1  cgd      *  	  :S<d><pat1><d><pat2><d>[g]
   1331  1.1  cgd      *  	  	    	Substitute <pat2> for <pat1> in the value
   1332  1.1  cgd      *  	  :H	    	Substitute the head of each word
   1333  1.1  cgd      *  	  :T	    	Substitute the tail of each word
   1334  1.1  cgd      *  	  :E	    	Substitute the extension (minus '.') of
   1335  1.1  cgd      *  	  	    	each word
   1336  1.1  cgd      *  	  :R	    	Substitute the root of each word
   1337  1.1  cgd      *  	  	    	(pathname minus the suffix).
   1338  1.1  cgd      *	    	  :lhs=rhs  	Like :S, but the rhs goes to the end of
   1339  1.1  cgd      *	    	    	    	the invocation.
   1340  1.1  cgd      */
   1341  1.1  cgd     if ((str != (char *)NULL) && haveModifier) {
   1342  1.1  cgd 	/*
   1343  1.1  cgd 	 * Skip initial colon while putting it back.
   1344  1.1  cgd 	 */
   1345  1.1  cgd 	*tstr++ = ':';
   1346  1.1  cgd 	while (*tstr != endc) {
   1347  1.1  cgd 	    char	*newStr;    /* New value to return */
   1348  1.1  cgd 	    char	termc;	    /* Character which terminated scan */
   1349  1.1  cgd 
   1350  1.1  cgd 	    if (DEBUG(VAR)) {
   1351  1.1  cgd 		printf("Applying :%c to \"%s\"\n", *tstr, str);
   1352  1.1  cgd 	    }
   1353  1.1  cgd 	    switch (*tstr) {
   1354  1.1  cgd 		case 'N':
   1355  1.1  cgd 		case 'M':
   1356  1.1  cgd 		{
   1357  1.1  cgd 		    char    *pattern;
   1358  1.1  cgd 		    char    *cp2;
   1359  1.1  cgd 		    Boolean copy;
   1360  1.1  cgd 
   1361  1.1  cgd 		    copy = FALSE;
   1362  1.1  cgd 		    for (cp = tstr + 1;
   1363  1.1  cgd 			 *cp != '\0' && *cp != ':' && *cp != endc;
   1364  1.1  cgd 			 cp++)
   1365  1.1  cgd 		    {
   1366  1.1  cgd 			if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)){
   1367  1.1  cgd 			    copy = TRUE;
   1368  1.1  cgd 			    cp++;
   1369  1.1  cgd 			}
   1370  1.1  cgd 		    }
   1371  1.1  cgd 		    termc = *cp;
   1372  1.1  cgd 		    *cp = '\0';
   1373  1.1  cgd 		    if (copy) {
   1374  1.1  cgd 			/*
   1375  1.1  cgd 			 * Need to compress the \:'s out of the pattern, so
   1376  1.1  cgd 			 * allocate enough room to hold the uncompressed
   1377  1.1  cgd 			 * pattern (note that cp started at tstr+1, so
   1378  1.1  cgd 			 * cp - tstr takes the null byte into account) and
   1379  1.1  cgd 			 * compress the pattern into the space.
   1380  1.1  cgd 			 */
   1381  1.1  cgd 			pattern = emalloc(cp - tstr);
   1382  1.1  cgd 			for (cp2 = pattern, cp = tstr + 1;
   1383  1.1  cgd 			     *cp != '\0';
   1384  1.1  cgd 			     cp++, cp2++)
   1385  1.1  cgd 			{
   1386  1.1  cgd 			    if ((*cp == '\\') &&
   1387  1.1  cgd 				(cp[1] == ':' || cp[1] == endc)) {
   1388  1.1  cgd 				    cp++;
   1389  1.1  cgd 			    }
   1390  1.1  cgd 			    *cp2 = *cp;
   1391  1.1  cgd 			}
   1392  1.1  cgd 			*cp2 = '\0';
   1393  1.1  cgd 		    } else {
   1394  1.1  cgd 			pattern = &tstr[1];
   1395  1.1  cgd 		    }
   1396  1.1  cgd 		    if (*tstr == 'M' || *tstr == 'm') {
   1397  1.1  cgd 			newStr = VarModify(str, VarMatch, (ClientData)pattern);
   1398  1.1  cgd 		    } else {
   1399  1.1  cgd 			newStr = VarModify(str, VarNoMatch,
   1400  1.1  cgd 					   (ClientData)pattern);
   1401  1.1  cgd 		    }
   1402  1.1  cgd 		    if (copy) {
   1403  1.1  cgd 			free(pattern);
   1404  1.1  cgd 		    }
   1405  1.1  cgd 		    break;
   1406  1.1  cgd 		}
   1407  1.1  cgd 		case 'S':
   1408  1.1  cgd 		{
   1409  1.1  cgd 		    VarPattern 	    pattern;
   1410  1.1  cgd 		    register char   delim;
   1411  1.1  cgd 		    Buffer  	    buf;    	/* Buffer for patterns */
   1412  1.1  cgd 
   1413  1.1  cgd 		    pattern.flags = 0;
   1414  1.1  cgd 		    delim = tstr[1];
   1415  1.1  cgd 		    tstr += 2;
   1416  1.1  cgd 		    /*
   1417  1.1  cgd 		     * If pattern begins with '^', it is anchored to the
   1418  1.1  cgd 		     * start of the word -- skip over it and flag pattern.
   1419  1.1  cgd 		     */
   1420  1.1  cgd 		    if (*tstr == '^') {
   1421  1.1  cgd 			pattern.flags |= VAR_MATCH_START;
   1422  1.1  cgd 			tstr += 1;
   1423  1.1  cgd 		    }
   1424  1.1  cgd 
   1425  1.1  cgd 		    buf = Buf_Init(0);
   1426  1.1  cgd 
   1427  1.1  cgd 		    /*
   1428  1.1  cgd 		     * Pass through the lhs looking for 1) escaped delimiters,
   1429  1.1  cgd 		     * '$'s and backslashes (place the escaped character in
   1430  1.1  cgd 		     * uninterpreted) and 2) unescaped $'s that aren't before
   1431  1.1  cgd 		     * the delimiter (expand the variable substitution).
   1432  1.1  cgd 		     * The result is left in the Buffer buf.
   1433  1.1  cgd 		     */
   1434  1.1  cgd 		    for (cp = tstr; *cp != '\0' && *cp != delim; cp++) {
   1435  1.1  cgd 			if ((*cp == '\\') &&
   1436  1.1  cgd 			    ((cp[1] == delim) ||
   1437  1.1  cgd 			     (cp[1] == '$') ||
   1438  1.1  cgd 			     (cp[1] == '\\')))
   1439  1.1  cgd 			{
   1440  1.1  cgd 			    Buf_AddByte(buf, (Byte)cp[1]);
   1441  1.1  cgd 			    cp++;
   1442  1.1  cgd 			} else if (*cp == '$') {
   1443  1.1  cgd 			    if (cp[1] != delim) {
   1444  1.1  cgd 				/*
   1445  1.1  cgd 				 * If unescaped dollar sign not before the
   1446  1.1  cgd 				 * delimiter, assume it's a variable
   1447  1.1  cgd 				 * substitution and recurse.
   1448  1.1  cgd 				 */
   1449  1.1  cgd 				char	    *cp2;
   1450  1.1  cgd 				int	    len;
   1451  1.1  cgd 				Boolean	    freeIt;
   1452  1.1  cgd 
   1453  1.1  cgd 				cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
   1454  1.1  cgd 				Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
   1455  1.1  cgd 				if (freeIt) {
   1456  1.1  cgd 				    free(cp2);
   1457  1.1  cgd 				}
   1458  1.1  cgd 				cp += len - 1;
   1459  1.1  cgd 			    } else {
   1460  1.1  cgd 				/*
   1461  1.1  cgd 				 * Unescaped $ at end of pattern => anchor
   1462  1.1  cgd 				 * pattern at end.
   1463  1.1  cgd 				 */
   1464  1.1  cgd 				pattern.flags |= VAR_MATCH_END;
   1465  1.1  cgd 			    }
   1466  1.1  cgd 			} else {
   1467  1.1  cgd 			    Buf_AddByte(buf, (Byte)*cp);
   1468  1.1  cgd 			}
   1469  1.1  cgd 		    }
   1470  1.1  cgd 
   1471  1.1  cgd 		    Buf_AddByte(buf, (Byte)'\0');
   1472  1.1  cgd 
   1473  1.1  cgd 		    /*
   1474  1.1  cgd 		     * If lhs didn't end with the delimiter, complain and
   1475  1.1  cgd 		     * return NULL
   1476  1.1  cgd 		     */
   1477  1.1  cgd 		    if (*cp != delim) {
   1478  1.1  cgd 			*lengthPtr = cp - start + 1;
   1479  1.1  cgd 			if (*freePtr) {
   1480  1.1  cgd 			    free(str);
   1481  1.1  cgd 			}
   1482  1.1  cgd 			Buf_Destroy(buf, TRUE);
   1483  1.1  cgd 			Error("Unclosed substitution for %s (%c missing)",
   1484  1.1  cgd 			      v->name, delim);
   1485  1.1  cgd 			return (var_Error);
   1486  1.1  cgd 		    }
   1487  1.1  cgd 
   1488  1.1  cgd 		    /*
   1489  1.1  cgd 		     * Fetch pattern and destroy buffer, but preserve the data
   1490  1.1  cgd 		     * in it, since that's our lhs. Note that Buf_GetAll
   1491  1.1  cgd 		     * will return the actual number of bytes, which includes
   1492  1.1  cgd 		     * the null byte, so we have to decrement the length by
   1493  1.1  cgd 		     * one.
   1494  1.1  cgd 		     */
   1495  1.1  cgd 		    pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen);
   1496  1.1  cgd 		    pattern.leftLen--;
   1497  1.1  cgd 		    Buf_Destroy(buf, FALSE);
   1498  1.1  cgd 
   1499  1.1  cgd 		    /*
   1500  1.1  cgd 		     * Now comes the replacement string. Three things need to
   1501  1.1  cgd 		     * be done here: 1) need to compress escaped delimiters and
   1502  1.1  cgd 		     * ampersands and 2) need to replace unescaped ampersands
   1503  1.1  cgd 		     * with the l.h.s. (since this isn't regexp, we can do
   1504  1.1  cgd 		     * it right here) and 3) expand any variable substitutions.
   1505  1.1  cgd 		     */
   1506  1.1  cgd 		    buf = Buf_Init(0);
   1507  1.1  cgd 
   1508  1.1  cgd 		    tstr = cp + 1;
   1509  1.1  cgd 		    for (cp = tstr; *cp != '\0' && *cp != delim; cp++) {
   1510  1.1  cgd 			if ((*cp == '\\') &&
   1511  1.1  cgd 			    ((cp[1] == delim) ||
   1512  1.1  cgd 			     (cp[1] == '&') ||
   1513  1.1  cgd 			     (cp[1] == '\\') ||
   1514  1.1  cgd 			     (cp[1] == '$')))
   1515  1.1  cgd 			{
   1516  1.1  cgd 			    Buf_AddByte(buf, (Byte)cp[1]);
   1517  1.1  cgd 			    cp++;
   1518  1.1  cgd 			} else if ((*cp == '$') && (cp[1] != delim)) {
   1519  1.1  cgd 			    char    *cp2;
   1520  1.1  cgd 			    int	    len;
   1521  1.1  cgd 			    Boolean freeIt;
   1522  1.1  cgd 
   1523  1.1  cgd 			    cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
   1524  1.1  cgd 			    Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
   1525  1.1  cgd 			    cp += len - 1;
   1526  1.1  cgd 			    if (freeIt) {
   1527  1.1  cgd 				free(cp2);
   1528  1.1  cgd 			    }
   1529  1.1  cgd 			} else if (*cp == '&') {
   1530  1.1  cgd 			    Buf_AddBytes(buf, pattern.leftLen,
   1531  1.1  cgd 					 (Byte *)pattern.lhs);
   1532  1.1  cgd 			} else {
   1533  1.1  cgd 			    Buf_AddByte(buf, (Byte)*cp);
   1534  1.1  cgd 			}
   1535  1.1  cgd 		    }
   1536  1.1  cgd 
   1537  1.1  cgd 		    Buf_AddByte(buf, (Byte)'\0');
   1538  1.1  cgd 
   1539  1.1  cgd 		    /*
   1540  1.1  cgd 		     * If didn't end in delimiter character, complain
   1541  1.1  cgd 		     */
   1542  1.1  cgd 		    if (*cp != delim) {
   1543  1.1  cgd 			*lengthPtr = cp - start + 1;
   1544  1.1  cgd 			if (*freePtr) {
   1545  1.1  cgd 			    free(str);
   1546  1.1  cgd 			}
   1547  1.1  cgd 			Buf_Destroy(buf, TRUE);
   1548  1.1  cgd 			Error("Unclosed substitution for %s (%c missing)",
   1549  1.1  cgd 			      v->name, delim);
   1550  1.1  cgd 			return (var_Error);
   1551  1.1  cgd 		    }
   1552  1.1  cgd 
   1553  1.1  cgd 		    pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
   1554  1.1  cgd 		    pattern.rightLen--;
   1555  1.1  cgd 		    Buf_Destroy(buf, FALSE);
   1556  1.1  cgd 
   1557  1.1  cgd 		    /*
   1558  1.1  cgd 		     * Check for global substitution. If 'g' after the final
   1559  1.1  cgd 		     * delimiter, substitution is global and is marked that
   1560  1.1  cgd 		     * way.
   1561  1.1  cgd 		     */
   1562  1.1  cgd 		    cp++;
   1563  1.1  cgd 		    if (*cp == 'g') {
   1564  1.1  cgd 			pattern.flags |= VAR_SUB_GLOBAL;
   1565  1.1  cgd 			cp++;
   1566  1.1  cgd 		    }
   1567  1.1  cgd 
   1568  1.1  cgd 		    termc = *cp;
   1569  1.1  cgd 		    newStr = VarModify(str, VarSubstitute,
   1570  1.1  cgd 				       (ClientData)&pattern);
   1571  1.1  cgd 		    /*
   1572  1.1  cgd 		     * Free the two strings.
   1573  1.1  cgd 		     */
   1574  1.1  cgd 		    free(pattern.lhs);
   1575  1.1  cgd 		    free(pattern.rhs);
   1576  1.1  cgd 		    break;
   1577  1.1  cgd 		}
   1578  1.1  cgd 		case 'T':
   1579  1.1  cgd 		    if (tstr[1] == endc || tstr[1] == ':') {
   1580  1.1  cgd 			newStr = VarModify (str, VarTail, (ClientData)0);
   1581  1.1  cgd 			cp = tstr + 1;
   1582  1.1  cgd 			termc = *cp;
   1583  1.1  cgd 			break;
   1584  1.1  cgd 		    }
   1585  1.1  cgd 		    /*FALLTHRU*/
   1586  1.1  cgd 		case 'H':
   1587  1.1  cgd 		    if (tstr[1] == endc || tstr[1] == ':') {
   1588  1.1  cgd 			newStr = VarModify (str, VarHead, (ClientData)0);
   1589  1.1  cgd 			cp = tstr + 1;
   1590  1.1  cgd 			termc = *cp;
   1591  1.1  cgd 			break;
   1592  1.1  cgd 		    }
   1593  1.1  cgd 		    /*FALLTHRU*/
   1594  1.1  cgd 		case 'E':
   1595  1.1  cgd 		    if (tstr[1] == endc || tstr[1] == ':') {
   1596  1.1  cgd 			newStr = VarModify (str, VarSuffix, (ClientData)0);
   1597  1.1  cgd 			cp = tstr + 1;
   1598  1.1  cgd 			termc = *cp;
   1599  1.1  cgd 			break;
   1600  1.1  cgd 		    }
   1601  1.1  cgd 		    /*FALLTHRU*/
   1602  1.1  cgd 		case 'R':
   1603  1.1  cgd 		    if (tstr[1] == endc || tstr[1] == ':') {
   1604  1.1  cgd 			newStr = VarModify (str, VarRoot, (ClientData)0);
   1605  1.1  cgd 			cp = tstr + 1;
   1606  1.1  cgd 			termc = *cp;
   1607  1.1  cgd 			break;
   1608  1.1  cgd 		    }
   1609  1.1  cgd 		    /*FALLTHRU*/
   1610  1.1  cgd 		default: {
   1611  1.1  cgd 		    /*
   1612  1.1  cgd 		     * This can either be a bogus modifier or a System-V
   1613  1.1  cgd 		     * substitution command.
   1614  1.1  cgd 		     */
   1615  1.1  cgd 		    VarPattern      pattern;
   1616  1.1  cgd 		    Boolean         eqFound;
   1617  1.1  cgd 
   1618  1.1  cgd 		    pattern.flags = 0;
   1619  1.1  cgd 		    eqFound = FALSE;
   1620  1.1  cgd 		    /*
   1621  1.1  cgd 		     * First we make a pass through the string trying
   1622  1.1  cgd 		     * to verify it is a SYSV-make-style translation:
   1623  1.1  cgd 		     * it must be: <string1>=<string2>)
   1624  1.1  cgd 		     */
   1625  1.1  cgd 		    for (cp = tstr; *cp != '\0' && *cp != endc; cp++) {
   1626  1.1  cgd 			if (*cp == '=') {
   1627  1.1  cgd 			    eqFound = TRUE;
   1628  1.1  cgd 			    /* continue looking for endc */
   1629  1.1  cgd 			}
   1630  1.1  cgd 		    }
   1631  1.1  cgd 		    if (*cp == endc && eqFound) {
   1632  1.1  cgd 
   1633  1.1  cgd 			/*
   1634  1.1  cgd 			 * Now we break this sucker into the lhs and
   1635  1.1  cgd 			 * rhs. We must null terminate them of course.
   1636  1.1  cgd 			 */
   1637  1.5  cgd 			for (cp = tstr; *cp != '='; cp++)
   1638  1.5  cgd 			    continue;
   1639  1.1  cgd 			pattern.lhs = tstr;
   1640  1.1  cgd 			pattern.leftLen = cp - tstr;
   1641  1.1  cgd 			*cp++ = '\0';
   1642  1.1  cgd 
   1643  1.1  cgd 			pattern.rhs = cp;
   1644  1.1  cgd 			while (*cp != endc) {
   1645  1.1  cgd 			    cp++;
   1646  1.1  cgd 			}
   1647  1.1  cgd 			pattern.rightLen = cp - pattern.rhs;
   1648  1.1  cgd 			*cp = '\0';
   1649  1.1  cgd 
   1650  1.1  cgd 			/*
   1651  1.1  cgd 			 * SYSV modifications happen through the whole
   1652  1.1  cgd 			 * string. Note the pattern is anchored at the end.
   1653  1.1  cgd 			 */
   1654  1.5  cgd 			newStr = VarModify(str, VarSYSVMatch,
   1655  1.1  cgd 					   (ClientData)&pattern);
   1656  1.1  cgd 
   1657  1.1  cgd 			/*
   1658  1.1  cgd 			 * Restore the nulled characters
   1659  1.1  cgd 			 */
   1660  1.1  cgd 			pattern.lhs[pattern.leftLen] = '=';
   1661  1.1  cgd 			pattern.rhs[pattern.rightLen] = endc;
   1662  1.1  cgd 			termc = endc;
   1663  1.1  cgd 		    } else {
   1664  1.1  cgd 			Error ("Unknown modifier '%c'\n", *tstr);
   1665  1.1  cgd 			for (cp = tstr+1;
   1666  1.1  cgd 			     *cp != ':' && *cp != endc && *cp != '\0';
   1667  1.5  cgd 			     cp++)
   1668  1.5  cgd 				 continue;
   1669  1.1  cgd 			termc = *cp;
   1670  1.1  cgd 			newStr = var_Error;
   1671  1.1  cgd 		    }
   1672  1.1  cgd 		}
   1673  1.1  cgd 	    }
   1674  1.1  cgd 	    if (DEBUG(VAR)) {
   1675  1.1  cgd 		printf("Result is \"%s\"\n", newStr);
   1676  1.1  cgd 	    }
   1677  1.1  cgd 
   1678  1.1  cgd 	    if (*freePtr) {
   1679  1.1  cgd 		free (str);
   1680  1.1  cgd 	    }
   1681  1.1  cgd 	    str = newStr;
   1682  1.1  cgd 	    if (str != var_Error) {
   1683  1.1  cgd 		*freePtr = TRUE;
   1684  1.1  cgd 	    } else {
   1685  1.1  cgd 		*freePtr = FALSE;
   1686  1.1  cgd 	    }
   1687  1.1  cgd 	    if (termc == '\0') {
   1688  1.1  cgd 		Error("Unclosed variable specification for %s", v->name);
   1689  1.1  cgd 	    } else if (termc == ':') {
   1690  1.1  cgd 		*cp++ = termc;
   1691  1.1  cgd 	    } else {
   1692  1.1  cgd 		*cp = termc;
   1693  1.1  cgd 	    }
   1694  1.1  cgd 	    tstr = cp;
   1695  1.1  cgd 	}
   1696  1.1  cgd 	*lengthPtr = tstr - start + 1;
   1697  1.1  cgd     } else {
   1698  1.1  cgd 	*lengthPtr = tstr - start + 1;
   1699  1.1  cgd 	*tstr = endc;
   1700  1.1  cgd     }
   1701  1.1  cgd 
   1702  1.1  cgd     if (v->flags & VAR_FROM_ENV) {
   1703  1.1  cgd 	Boolean	  destroy = FALSE;
   1704  1.1  cgd 
   1705  1.1  cgd 	if (str != (char *)Buf_GetAll(v->val, (int *)NULL)) {
   1706  1.1  cgd 	    destroy = TRUE;
   1707  1.1  cgd 	} else {
   1708  1.1  cgd 	    /*
   1709  1.1  cgd 	     * Returning the value unmodified, so tell the caller to free
   1710  1.1  cgd 	     * the thing.
   1711  1.1  cgd 	     */
   1712  1.1  cgd 	    *freePtr = TRUE;
   1713  1.1  cgd 	}
   1714  1.1  cgd 	Buf_Destroy(v->val, destroy);
   1715  1.1  cgd 	free((Address)v);
   1716  1.1  cgd     } else if (v->flags & VAR_JUNK) {
   1717  1.1  cgd 	/*
   1718  1.1  cgd 	 * Perform any free'ing needed and set *freePtr to FALSE so the caller
   1719  1.1  cgd 	 * doesn't try to free a static pointer.
   1720  1.1  cgd 	 */
   1721  1.1  cgd 	if (*freePtr) {
   1722  1.1  cgd 	    free(str);
   1723  1.1  cgd 	}
   1724  1.1  cgd 	*freePtr = FALSE;
   1725  1.1  cgd 	free((Address)v);
   1726  1.1  cgd 	if (dynamic) {
   1727  1.1  cgd 	    str = emalloc(*lengthPtr + 1);
   1728  1.1  cgd 	    strncpy(str, start, *lengthPtr);
   1729  1.1  cgd 	    str[*lengthPtr] = '\0';
   1730  1.1  cgd 	    *freePtr = TRUE;
   1731  1.1  cgd 	} else {
   1732  1.1  cgd 	    str = var_Error;
   1733  1.1  cgd 	}
   1734  1.1  cgd     }
   1735  1.1  cgd     return (str);
   1736  1.1  cgd }
   1737  1.1  cgd 
   1738  1.1  cgd /*-
   1739  1.1  cgd  *-----------------------------------------------------------------------
   1740  1.1  cgd  * Var_Subst  --
   1741  1.1  cgd  *	Substitute for all variables in the given string in the given context
   1742  1.1  cgd  *	If undefErr is TRUE, Parse_Error will be called when an undefined
   1743  1.1  cgd  *	variable is encountered.
   1744  1.1  cgd  *
   1745  1.1  cgd  * Results:
   1746  1.1  cgd  *	The resulting string.
   1747  1.1  cgd  *
   1748  1.1  cgd  * Side Effects:
   1749  1.1  cgd  *	None. The old string must be freed by the caller
   1750  1.1  cgd  *-----------------------------------------------------------------------
   1751  1.1  cgd  */
   1752  1.1  cgd char *
   1753  1.5  cgd Var_Subst (var, str, ctxt, undefErr)
   1754  1.5  cgd     char	  *var;		    /* Named variable || NULL for all */
   1755  1.5  cgd     char 	  *str;	    	    /* the string in which to substitute */
   1756  1.1  cgd     GNode         *ctxt;	    /* the context wherein to find variables */
   1757  1.1  cgd     Boolean 	  undefErr; 	    /* TRUE if undefineds are an error */
   1758  1.1  cgd {
   1759  1.1  cgd     Buffer  	  buf;	    	    /* Buffer for forming things */
   1760  1.1  cgd     char    	  *val;		    /* Value to substitute for a variable */
   1761  1.1  cgd     int	    	  length;   	    /* Length of the variable invocation */
   1762  1.1  cgd     Boolean 	  doFree;   	    /* Set true if val should be freed */
   1763  1.1  cgd     static Boolean errorReported;   /* Set true if an error has already
   1764  1.1  cgd 				     * been reported to prevent a plethora
   1765  1.1  cgd 				     * of messages when recursing */
   1766  1.1  cgd 
   1767  1.5  cgd     buf = Buf_Init (MAKE_BSIZE);
   1768  1.1  cgd     errorReported = FALSE;
   1769  1.1  cgd 
   1770  1.1  cgd     while (*str) {
   1771  1.5  cgd 	if (var == NULL && (*str == '$') && (str[1] == '$')) {
   1772  1.1  cgd 	    /*
   1773  1.1  cgd 	     * A dollar sign may be escaped either with another dollar sign.
   1774  1.1  cgd 	     * In such a case, we skip over the escape character and store the
   1775  1.1  cgd 	     * dollar sign into the buffer directly.
   1776  1.1  cgd 	     */
   1777  1.1  cgd 	    str++;
   1778  1.1  cgd 	    Buf_AddByte(buf, (Byte)*str);
   1779  1.1  cgd 	    str++;
   1780  1.1  cgd 	} else if (*str != '$') {
   1781  1.1  cgd 	    /*
   1782  1.1  cgd 	     * Skip as many characters as possible -- either to the end of
   1783  1.1  cgd 	     * the string or to the next dollar sign (variable invocation).
   1784  1.1  cgd 	     */
   1785  1.1  cgd 	    char  *cp;
   1786  1.1  cgd 
   1787  1.5  cgd 	    for (cp = str++; *str != '$' && *str != '\0'; str++)
   1788  1.5  cgd 		continue;
   1789  1.1  cgd 	    Buf_AddBytes(buf, str - cp, (Byte *)cp);
   1790  1.1  cgd 	} else {
   1791  1.5  cgd 	    if (var != NULL) {
   1792  1.5  cgd 		int expand;
   1793  1.5  cgd 		for (;;) {
   1794  1.5  cgd 		    if (str[1] != '(' && str[1] != '{') {
   1795  1.5  cgd 			if (str[1] != *var) {
   1796  1.5  cgd 			    Buf_AddBytes(buf, 2, (Byte *) str);
   1797  1.5  cgd 			    str += 2;
   1798  1.5  cgd 			    expand = FALSE;
   1799  1.5  cgd 			}
   1800  1.5  cgd 			else
   1801  1.5  cgd 			    expand = TRUE;
   1802  1.5  cgd 			break;
   1803  1.5  cgd 		    }
   1804  1.5  cgd 		    else {
   1805  1.5  cgd 			char *p;
   1806  1.5  cgd 
   1807  1.5  cgd 			/*
   1808  1.5  cgd 			 * Scan up to the end of the variable name.
   1809  1.5  cgd 			 */
   1810  1.5  cgd 			for (p = &str[2]; *p &&
   1811  1.5  cgd 			     *p != ':' && *p != ')' && *p != '}'; p++)
   1812  1.5  cgd 			    if (*p == '$')
   1813  1.5  cgd 				break;
   1814  1.5  cgd 			/*
   1815  1.5  cgd 			 * A variable inside the variable. We cannot expand
   1816  1.5  cgd 			 * the external variable yet, so we try again with
   1817  1.5  cgd 			 * the nested one
   1818  1.5  cgd 			 */
   1819  1.5  cgd 			if (*p == '$') {
   1820  1.5  cgd 			    Buf_AddBytes(buf, p - str, (Byte *) str);
   1821  1.5  cgd 			    str = p;
   1822  1.5  cgd 			    continue;
   1823  1.5  cgd 			}
   1824  1.5  cgd 
   1825  1.5  cgd 			if (strncmp(var, str + 2, p - str - 2) != 0 ||
   1826  1.5  cgd 			    var[p - str - 2] != '\0') {
   1827  1.5  cgd 			    /*
   1828  1.5  cgd 			     * Not the variable we want to expand, scan
   1829  1.5  cgd 			     * until the next variable
   1830  1.5  cgd 			     */
   1831  1.5  cgd 			    for (;*p != '$' && *p != '\0'; p++)
   1832  1.5  cgd 				continue;
   1833  1.5  cgd 			    Buf_AddBytes(buf, p - str, (Byte *) str);
   1834  1.5  cgd 			    str = p;
   1835  1.5  cgd 			    expand = FALSE;
   1836  1.5  cgd 			}
   1837  1.5  cgd 			else
   1838  1.5  cgd 			    expand = TRUE;
   1839  1.5  cgd 			break;
   1840  1.5  cgd 		    }
   1841  1.5  cgd 		}
   1842  1.5  cgd 		if (!expand)
   1843  1.5  cgd 		    continue;
   1844  1.5  cgd 	    }
   1845  1.5  cgd 
   1846  1.1  cgd 	    val = Var_Parse (str, ctxt, undefErr, &length, &doFree);
   1847  1.1  cgd 
   1848  1.1  cgd 	    /*
   1849  1.1  cgd 	     * When we come down here, val should either point to the
   1850  1.1  cgd 	     * value of this variable, suitably modified, or be NULL.
   1851  1.1  cgd 	     * Length should be the total length of the potential
   1852  1.1  cgd 	     * variable invocation (from $ to end character...)
   1853  1.1  cgd 	     */
   1854  1.1  cgd 	    if (val == var_Error || val == varNoError) {
   1855  1.1  cgd 		/*
   1856  1.1  cgd 		 * If performing old-time variable substitution, skip over
   1857  1.1  cgd 		 * the variable and continue with the substitution. Otherwise,
   1858  1.1  cgd 		 * store the dollar sign and advance str so we continue with
   1859  1.1  cgd 		 * the string...
   1860  1.1  cgd 		 */
   1861  1.1  cgd 		if (oldVars) {
   1862  1.1  cgd 		    str += length;
   1863  1.1  cgd 		} else if (undefErr) {
   1864  1.1  cgd 		    /*
   1865  1.1  cgd 		     * If variable is undefined, complain and skip the
   1866  1.1  cgd 		     * variable. The complaint will stop us from doing anything
   1867  1.1  cgd 		     * when the file is parsed.
   1868  1.1  cgd 		     */
   1869  1.1  cgd 		    if (!errorReported) {
   1870  1.1  cgd 			Parse_Error (PARSE_FATAL,
   1871  1.1  cgd 				     "Undefined variable \"%.*s\"",length,str);
   1872  1.1  cgd 		    }
   1873  1.1  cgd 		    str += length;
   1874  1.1  cgd 		    errorReported = TRUE;
   1875  1.1  cgd 		} else {
   1876  1.1  cgd 		    Buf_AddByte (buf, (Byte)*str);
   1877  1.1  cgd 		    str += 1;
   1878  1.1  cgd 		}
   1879  1.1  cgd 	    } else {
   1880  1.1  cgd 		/*
   1881  1.1  cgd 		 * We've now got a variable structure to store in. But first,
   1882  1.1  cgd 		 * advance the string pointer.
   1883  1.1  cgd 		 */
   1884  1.1  cgd 		str += length;
   1885  1.1  cgd 
   1886  1.1  cgd 		/*
   1887  1.1  cgd 		 * Copy all the characters from the variable value straight
   1888  1.1  cgd 		 * into the new string.
   1889  1.1  cgd 		 */
   1890  1.1  cgd 		Buf_AddBytes (buf, strlen (val), (Byte *)val);
   1891  1.1  cgd 		if (doFree) {
   1892  1.1  cgd 		    free ((Address)val);
   1893  1.1  cgd 		}
   1894  1.1  cgd 	    }
   1895  1.1  cgd 	}
   1896  1.1  cgd     }
   1897  1.1  cgd 
   1898  1.1  cgd     Buf_AddByte (buf, '\0');
   1899  1.1  cgd     str = (char *)Buf_GetAll (buf, (int *)NULL);
   1900  1.1  cgd     Buf_Destroy (buf, FALSE);
   1901  1.1  cgd     return (str);
   1902  1.1  cgd }
   1903  1.1  cgd 
   1904  1.1  cgd /*-
   1905  1.1  cgd  *-----------------------------------------------------------------------
   1906  1.1  cgd  * Var_GetTail --
   1907  1.1  cgd  *	Return the tail from each of a list of words. Used to set the
   1908  1.1  cgd  *	System V local variables.
   1909  1.1  cgd  *
   1910  1.1  cgd  * Results:
   1911  1.1  cgd  *	The resulting string.
   1912  1.1  cgd  *
   1913  1.1  cgd  * Side Effects:
   1914  1.1  cgd  *	None.
   1915  1.1  cgd  *
   1916  1.1  cgd  *-----------------------------------------------------------------------
   1917  1.1  cgd  */
   1918  1.1  cgd char *
   1919  1.1  cgd Var_GetTail(file)
   1920  1.1  cgd     char    	*file;	    /* Filename to modify */
   1921  1.1  cgd {
   1922  1.1  cgd     return(VarModify(file, VarTail, (ClientData)0));
   1923  1.1  cgd }
   1924  1.1  cgd 
   1925  1.1  cgd /*-
   1926  1.1  cgd  *-----------------------------------------------------------------------
   1927  1.1  cgd  * Var_GetHead --
   1928  1.1  cgd  *	Find the leading components of a (list of) filename(s).
   1929  1.1  cgd  *	XXX: VarHead does not replace foo by ., as (sun) System V make
   1930  1.1  cgd  *	does.
   1931  1.1  cgd  *
   1932  1.1  cgd  * Results:
   1933  1.1  cgd  *	The leading components.
   1934  1.1  cgd  *
   1935  1.1  cgd  * Side Effects:
   1936  1.1  cgd  *	None.
   1937  1.1  cgd  *
   1938  1.1  cgd  *-----------------------------------------------------------------------
   1939  1.1  cgd  */
   1940  1.1  cgd char *
   1941  1.1  cgd Var_GetHead(file)
   1942  1.1  cgd     char    	*file;	    /* Filename to manipulate */
   1943  1.1  cgd {
   1944  1.1  cgd     return(VarModify(file, VarHead, (ClientData)0));
   1945  1.1  cgd }
   1946  1.1  cgd 
   1947  1.1  cgd /*-
   1948  1.1  cgd  *-----------------------------------------------------------------------
   1949  1.1  cgd  * Var_Init --
   1950  1.1  cgd  *	Initialize the module
   1951  1.1  cgd  *
   1952  1.1  cgd  * Results:
   1953  1.1  cgd  *	None
   1954  1.1  cgd  *
   1955  1.1  cgd  * Side Effects:
   1956  1.1  cgd  *	The VAR_CMD and VAR_GLOBAL contexts are created
   1957  1.1  cgd  *-----------------------------------------------------------------------
   1958  1.1  cgd  */
   1959  1.1  cgd void
   1960  1.1  cgd Var_Init ()
   1961  1.1  cgd {
   1962  1.1  cgd     VAR_GLOBAL = Targ_NewGN ("Global");
   1963  1.1  cgd     VAR_CMD = Targ_NewGN ("Command");
   1964  1.1  cgd 
   1965  1.1  cgd }
   1966  1.1  cgd 
   1967  1.1  cgd /****************** PRINT DEBUGGING INFO *****************/
   1968  1.5  cgd static int
   1969  1.1  cgd VarPrintVar (v)
   1970  1.1  cgd     Var            *v;
   1971  1.1  cgd {
   1972  1.5  cgd     printf ("%-16s = %s\n", v->name, (char *) Buf_GetAll(v->val, (int *)NULL));
   1973  1.1  cgd     return (0);
   1974  1.1  cgd }
   1975  1.1  cgd 
   1976  1.1  cgd /*-
   1977  1.1  cgd  *-----------------------------------------------------------------------
   1978  1.1  cgd  * Var_Dump --
   1979  1.1  cgd  *	print all variables in a context
   1980  1.1  cgd  *-----------------------------------------------------------------------
   1981  1.1  cgd  */
   1982  1.5  cgd void
   1983  1.1  cgd Var_Dump (ctxt)
   1984  1.1  cgd     GNode          *ctxt;
   1985  1.1  cgd {
   1986  1.1  cgd     Lst_ForEach (ctxt->context, VarPrintVar);
   1987  1.1  cgd }
   1988