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gram.y revision 1.10 
      1 %{
      2 /*	$NetBSD: gram.y,v 1.10 2003/08/07 11:15:36 agc Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 1983, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 #ifndef lint
     35 #if 0
     36 static char sccsid[] = "@(#)gram.y	8.1 (Berkeley) 6/9/93";
     37 #else
     38 __RCSID("$NetBSD: gram.y,v 1.10 2003/08/07 11:15:36 agc Exp $");
     39 #endif
     40 #endif /* not lint */
     41 
     42 #include "defs.h"
     43 
     44 struct	cmd *cmds = NULL;
     45 struct	cmd *last_cmd;
     46 struct	namelist *last_n;
     47 struct	subcmd *last_sc;
     48 
     49 static char   *makestr(char *);
     50 void	append(char *, struct namelist *, char *, struct subcmd *);
     51 
     52 %}
     53 
     54 %term EQUAL	1
     55 %term LP	2
     56 %term RP	3
     57 %term SM	4
     58 %term ARROW	5
     59 %term COLON	6
     60 %term DCOLON	7
     61 %term NAME	8
     62 %term STRING	9
     63 %term INSTALL	10
     64 %term NOTIFY	11
     65 %term EXCEPT	12
     66 %term PATTERN	13
     67 %term SPECIAL	14
     68 %term OPTION	15
     69 
     70 %union {
     71 	int intval;
     72 	char *string;
     73 	struct subcmd *subcmd;
     74 	struct namelist *namel;
     75 }
     76 
     77 %type <intval> OPTION, options
     78 %type <string> NAME, STRING
     79 %type <subcmd> INSTALL, NOTIFY, EXCEPT, PATTERN, SPECIAL, cmdlist, cmd
     80 %type <namel> namelist, names, opt_namelist
     81 
     82 %%
     83 
     84 file:		  /* VOID */
     85 		| file command
     86 		;
     87 
     88 command:	  NAME EQUAL namelist = {
     89 			(void) lookup($1, INSERT, $3);
     90 		}
     91 		| namelist ARROW namelist cmdlist = {
     92 			insert(NULL, $1, $3, $4);
     93 		}
     94 		| NAME COLON namelist ARROW namelist cmdlist = {
     95 			insert($1, $3, $5, $6);
     96 		}
     97 		| namelist DCOLON NAME cmdlist = {
     98 			append(NULL, $1, $3, $4);
     99 		}
    100 		| NAME COLON namelist DCOLON NAME cmdlist = {
    101 			append($1, $3, $5, $6);
    102 		}
    103 		| error
    104 		;
    105 
    106 namelist:	  NAME = {
    107 			$$ = makenl($1);
    108 		}
    109 		| LP names RP = {
    110 			$$ = $2;
    111 		}
    112 		;
    113 
    114 names:		  /* VOID */ {
    115 			$$ = last_n = NULL;
    116 		}
    117 		| names NAME = {
    118 			if (last_n == NULL)
    119 				$$ = last_n = makenl($2);
    120 			else {
    121 				last_n->n_next = makenl($2);
    122 				last_n = last_n->n_next;
    123 				$$ = $1;
    124 			}
    125 		}
    126 		;
    127 
    128 cmdlist:	  /* VOID */ {
    129 			$$ = last_sc = NULL;
    130 		}
    131 		| cmdlist cmd = {
    132 			if (last_sc == NULL)
    133 				$$ = last_sc = $2;
    134 			else {
    135 				last_sc->sc_next = $2;
    136 				last_sc = $2;
    137 				$$ = $1;
    138 			}
    139 		}
    140 		;
    141 
    142 cmd:		  INSTALL options opt_namelist SM = {
    143 			struct namelist *nl;
    144 
    145 			$1->sc_options = $2 | options;
    146 			if ($3 != NULL) {
    147 				nl = expand($3, E_VARS);
    148 				if (nl) {
    149 					if (nl->n_next != NULL)
    150 					    yyerror("only one name allowed\n");
    151 					$1->sc_name = nl->n_name;
    152 					free(nl);
    153 				} else
    154 					$1->sc_name = NULL;
    155 			}
    156 			$$ = $1;
    157 		}
    158 		| NOTIFY namelist SM = {
    159 			if ($2 != NULL)
    160 				$1->sc_args = expand($2, E_VARS);
    161 			$$ = $1;
    162 		}
    163 		| EXCEPT namelist SM = {
    164 			if ($2 != NULL)
    165 				$1->sc_args = expand($2, E_ALL);
    166 			$$ = $1;
    167 		}
    168 		| PATTERN namelist SM = {
    169 			if ($2 != NULL)
    170 				$1->sc_args = expand($2, E_VARS);
    171 			$$ = $1;
    172 		}
    173 		| SPECIAL opt_namelist STRING SM = {
    174 			if ($2 != NULL)
    175 				$1->sc_args = expand($2, E_ALL);
    176 			$1->sc_name = $3;
    177 			$$ = $1;
    178 		}
    179 		;
    180 
    181 options:	  /* VOID */ = {
    182 			$$ = 0;
    183 		}
    184 		| options OPTION = {
    185 			$$ |= $2;
    186 		}
    187 		;
    188 
    189 opt_namelist:	  /* VOID */ = {
    190 			$$ = NULL;
    191 		}
    192 		| namelist = {
    193 			$$ = $1;
    194 		}
    195 		;
    196 
    197 %%
    198 
    199 int	yylineno = 1;
    200 extern	FILE *fin;
    201 
    202 int	yylex(void);
    203 
    204 int
    205 yylex(void)
    206 {
    207 	static char yytext[INMAX];
    208 	int c;
    209 	char *cp1, *cp2;
    210 	static char quotechars[] = "[]{}*?$";
    211 
    212 again:
    213 	switch (c = getc(fin)) {
    214 	case EOF:  /* end of file */
    215 		return(0);
    216 
    217 	case '#':  /* start of comment */
    218 		while ((c = getc(fin)) != EOF && c != '\n')
    219 			;
    220 		if (c == EOF)
    221 			return(0);
    222 	case '\n':
    223 		yylineno++;
    224 	case ' ':
    225 	case '\t':  /* skip blanks */
    226 		goto again;
    227 
    228 	case '=':  /* EQUAL */
    229 		return(EQUAL);
    230 
    231 	case '(':  /* LP */
    232 		return(LP);
    233 
    234 	case ')':  /* RP */
    235 		return(RP);
    236 
    237 	case ';':  /* SM */
    238 		return(SM);
    239 
    240 	case '-':  /* -> */
    241 		if ((c = getc(fin)) == '>')
    242 			return(ARROW);
    243 		ungetc(c, fin);
    244 		c = '-';
    245 		break;
    246 
    247 	case '"':  /* STRING */
    248 		cp1 = yytext;
    249 		cp2 = &yytext[INMAX - 1];
    250 		for (;;) {
    251 			if (cp1 >= cp2) {
    252 				yyerror("command string too long\n");
    253 				break;
    254 			}
    255 			c = getc(fin);
    256 			if (c == EOF || c == '"')
    257 				break;
    258 			if (c == '\\') {
    259 				if ((c = getc(fin)) == EOF) {
    260 					*cp1++ = '\\';
    261 					break;
    262 				}
    263 			}
    264 			if (c == '\n') {
    265 				yylineno++;
    266 				c = ' '; /* can't send '\n' */
    267 			}
    268 			*cp1++ = c;
    269 		}
    270 		if (c != '"')
    271 			yyerror("missing closing '\"'\n");
    272 		*cp1 = '\0';
    273 		yylval.string = makestr(yytext);
    274 		return(STRING);
    275 
    276 	case ':':  /* : or :: */
    277 		if ((c = getc(fin)) == ':')
    278 			return(DCOLON);
    279 		ungetc(c, fin);
    280 		return(COLON);
    281 	}
    282 	cp1 = yytext;
    283 	cp2 = &yytext[INMAX - 1];
    284 	for (;;) {
    285 		if (cp1 >= cp2) {
    286 			yyerror("input line too long\n");
    287 			break;
    288 		}
    289 		if (c == '\\') {
    290 			if ((c = getc(fin)) != EOF) {
    291 				if (any(c, quotechars))
    292 					c |= QUOTE;
    293 			} else {
    294 				*cp1++ = '\\';
    295 				break;
    296 			}
    297 		}
    298 		*cp1++ = c;
    299 		c = getc(fin);
    300 		if (c == EOF || any(c, " \"'\t()=;:\n")) {
    301 			ungetc(c, fin);
    302 			break;
    303 		}
    304 	}
    305 	*cp1 = '\0';
    306 	if (yytext[0] == '-' && yytext[2] == '\0') {
    307 		switch (yytext[1]) {
    308 		case 'b':
    309 			yylval.intval = COMPARE;
    310 			return(OPTION);
    311 
    312 		case 'R':
    313 			yylval.intval = REMOVE;
    314 			return(OPTION);
    315 
    316 		case 'v':
    317 			yylval.intval = VERIFY;
    318 			return(OPTION);
    319 
    320 		case 'w':
    321 			yylval.intval = WHOLE;
    322 			return(OPTION);
    323 
    324 		case 'y':
    325 			yylval.intval = YOUNGER;
    326 			return(OPTION);
    327 
    328 		case 'h':
    329 			yylval.intval = FOLLOW;
    330 			return(OPTION);
    331 
    332 		case 'i':
    333 			yylval.intval = IGNLNKS;
    334 			return(OPTION);
    335 		}
    336 	}
    337 	if (!strcmp(yytext, "install"))
    338 		c = INSTALL;
    339 	else if (!strcmp(yytext, "notify"))
    340 		c = NOTIFY;
    341 	else if (!strcmp(yytext, "except"))
    342 		c = EXCEPT;
    343 	else if (!strcmp(yytext, "except_pat"))
    344 		c = PATTERN;
    345 	else if (!strcmp(yytext, "special"))
    346 		c = SPECIAL;
    347 	else {
    348 		yylval.string = makestr(yytext);
    349 		return(NAME);
    350 	}
    351 	yylval.subcmd = makesubcmd(c);
    352 	return(c);
    353 }
    354 
    355 int
    356 any(int c, char *str)
    357 {
    358 	while (*str)
    359 		if (c == *str++)
    360 			return(1);
    361 	return(0);
    362 }
    363 
    364 /*
    365  * Insert or append ARROW command to list of hosts to be updated.
    366  */
    367 void
    368 insert(char *label, struct namelist *files, struct namelist *hosts,
    369        struct subcmd *subcmds)
    370 {
    371 	struct cmd *c, *prev, *nc;
    372 	struct namelist *h, *nexth;
    373 
    374 	files = expand(files, E_VARS|E_SHELL);
    375 	hosts = expand(hosts, E_ALL);
    376 	for (h = hosts; h != NULL; nexth = h->n_next, free(h), h = nexth) {
    377 		/*
    378 		 * Search command list for an update to the same host.
    379 		 */
    380 		for (prev = NULL, c = cmds; c!=NULL; prev = c, c = c->c_next) {
    381 			if (strcmp(c->c_name, h->n_name) == 0) {
    382 				do {
    383 					prev = c;
    384 					c = c->c_next;
    385 				} while (c != NULL &&
    386 					strcmp(c->c_name, h->n_name) == 0);
    387 				break;
    388 			}
    389 		}
    390 		/*
    391 		 * Insert new command to update host.
    392 		 */
    393 		nc = ALLOC(cmd);
    394 		if (nc == NULL)
    395 			fatal("ran out of memory\n");
    396 		nc->c_type = ARROW;
    397 		nc->c_name = h->n_name;
    398 		nc->c_label = label;
    399 		nc->c_files = files;
    400 		nc->c_cmds = subcmds;
    401 		nc->c_next = c;
    402 		if (prev == NULL)
    403 			cmds = nc;
    404 		else
    405 			prev->c_next = nc;
    406 		/* update last_cmd if appending nc to cmds */
    407 		if (c == NULL)
    408 			last_cmd = nc;
    409 	}
    410 }
    411 
    412 /*
    413  * Append DCOLON command to the end of the command list since these are always
    414  * executed in the order they appear in the distfile.
    415  */
    416 void
    417 append(char *label, struct namelist *files, char *stamp,
    418        struct subcmd *subcmds)
    419 {
    420 	struct cmd *c;
    421 
    422 	c = ALLOC(cmd);
    423 	if (c == NULL)
    424 		fatal("ran out of memory\n");
    425 	c->c_type = DCOLON;
    426 	c->c_name = stamp;
    427 	c->c_label = label;
    428 	c->c_files = expand(files, E_ALL);
    429 	c->c_cmds = subcmds;
    430 	c->c_next = NULL;
    431 	if (cmds == NULL)
    432 		cmds = last_cmd = c;
    433 	else {
    434 		last_cmd->c_next = c;
    435 		last_cmd = c;
    436 	}
    437 }
    438 
    439 /*
    440  * Error printing routine in parser.
    441  */
    442 void
    443 yyerror(char *s)
    444 {
    445 
    446 	++nerrs;
    447 	fflush(stdout);
    448 	fprintf(stderr, "rdist: line %d: %s\n", yylineno, s);
    449 }
    450 
    451 /*
    452  * Return a copy of the string.
    453  */
    454 static char *
    455 makestr(char *str)
    456 {
    457 	char *cp, *s;
    458 
    459 	str = cp = malloc(strlen(s = str) + 1);
    460 	if (cp == NULL)
    461 		fatal("ran out of memory\n");
    462 	while ((*cp++ = *s++) != NULL)
    463 		;
    464 	return(str);
    465 }
    466 
    467 /*
    468  * Allocate a namelist structure.
    469  */
    470 struct namelist *
    471 makenl(char *name)
    472 {
    473 	struct namelist *nl;
    474 
    475 	nl = ALLOC(namelist);
    476 	if (nl == NULL)
    477 		fatal("ran out of memory\n");
    478 	nl->n_name = name;
    479 	nl->n_next = NULL;
    480 	return(nl);
    481 }
    482 
    483 /*
    484  * Make a sub command for lists of variables, commands, etc.
    485  */
    486 struct subcmd *
    487 makesubcmd(int type)
    488 {
    489 	struct subcmd *sc;
    490 
    491 	sc = ALLOC(subcmd);
    492 	if (sc == NULL)
    493 		fatal("ran out of memory\n");
    494 	sc->sc_type = type;
    495 	sc->sc_args = NULL;
    496 	sc->sc_next = NULL;
    497 	sc->sc_name = NULL;
    498 	return(sc);
    499 }
    500