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show.c revision 1.7 
      1 /*-
      2  * Copyright (c) 1991, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Kenneth Almquist.
      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. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 /*static char sccsid[] = "from: @(#)show.c	8.1 (Berkeley) 5/31/93";*/
     39 static char *rcsid = "$Id: show.c,v 1.7 1994/12/04 07:12:27 cgd Exp $";
     40 #endif /* not lint */
     41 
     42 #include <stdio.h>
     43 #include "shell.h"
     44 #include "parser.h"
     45 #include "nodes.h"
     46 #include "mystring.h"
     47 #include "extern.h"
     48 
     49 
     50 #ifdef DEBUG
     51 static shtree(), shcmd(), sharg(), indent();
     52 
     53 
     54 showtree(n)
     55 	union node *n;
     56 	{
     57 	trputs("showtree called\n");
     58 	shtree(n, 1, NULL, stdout);
     59 }
     60 
     61 
     62 static
     63 shtree(n, ind, pfx, fp)
     64 	union node *n;
     65 	char *pfx;
     66 	FILE *fp;
     67 	{
     68 	struct nodelist *lp;
     69 	char *s;
     70 
     71 	indent(ind, pfx, fp);
     72 	switch(n->type) {
     73 	case NSEMI:
     74 		s = "; ";
     75 		goto binop;
     76 	case NAND:
     77 		s = " && ";
     78 		goto binop;
     79 	case NOR:
     80 		s = " || ";
     81 binop:
     82 		shtree(n->nbinary.ch1, ind, NULL, fp);
     83 	   /*    if (ind < 0) */
     84 			fputs(s, fp);
     85 		shtree(n->nbinary.ch2, ind, NULL, fp);
     86 		break;
     87 	case NCMD:
     88 		shcmd(n, fp);
     89 		if (ind >= 0)
     90 			putc('\n', fp);
     91 		break;
     92 	case NPIPE:
     93 		for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
     94 			shcmd(lp->n, fp);
     95 			if (lp->next)
     96 				fputs(" | ", fp);
     97 		}
     98 		if (n->npipe.backgnd)
     99 			fputs(" &", fp);
    100 		if (ind >= 0)
    101 			putc('\n', fp);
    102 		break;
    103 	default:
    104 		fprintf(fp, "<node type %d>", n->type);
    105 		if (ind >= 0)
    106 			putc('\n', fp);
    107 		break;
    108 	}
    109 }
    110 
    111 
    112 
    113 static
    114 shcmd(cmd, fp)
    115 	union node *cmd;
    116 	FILE *fp;
    117 	{
    118 	union node *np;
    119 	int first;
    120 	char *s;
    121 	int dftfd;
    122 
    123 	first = 1;
    124 	for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
    125 		if (! first)
    126 			putchar(' ');
    127 		sharg(np, fp);
    128 		first = 0;
    129 	}
    130 	for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
    131 		if (! first)
    132 			putchar(' ');
    133 		switch (np->nfile.type) {
    134 			case NTO:	s = ">";  dftfd = 1; break;
    135 			case NAPPEND:	s = ">>"; dftfd = 1; break;
    136 			case NTOFD:	s = ">&"; dftfd = 1; break;
    137 			case NFROM:	s = "<";  dftfd = 0; break;
    138 			case NFROMFD:	s = "<&"; dftfd = 0; break;
    139 		}
    140 		if (np->nfile.fd != dftfd)
    141 			fprintf(fp, "%d", np->nfile.fd);
    142 		fputs(s, fp);
    143 		if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
    144 			fprintf(fp, "%d", np->ndup.dupfd);
    145 		} else {
    146 			sharg(np->nfile.fname, fp);
    147 		}
    148 		first = 0;
    149 	}
    150 }
    151 
    152 
    153 
    154 static
    155 sharg(arg, fp)
    156 	union node *arg;
    157 	FILE *fp;
    158 	{
    159 	char *p;
    160 	struct nodelist *bqlist;
    161 	int subtype;
    162 
    163 	if (arg->type != NARG) {
    164 		printf("<node type %d>\n", arg->type);
    165 		fflush(stdout);
    166 		abort();
    167 	}
    168 	bqlist = arg->narg.backquote;
    169 	for (p = arg->narg.text ; *p ; p++) {
    170 		switch (*p) {
    171 		case CTLESC:
    172 			putc(*++p, fp);
    173 			break;
    174 		case CTLVAR:
    175 			putc('$', fp);
    176 			putc('{', fp);
    177 			subtype = *++p;
    178 			while (*p != '=')
    179 				putc(*p++, fp);
    180 			if (subtype & VSNUL)
    181 				putc(':', fp);
    182 			switch (subtype & VSTYPE) {
    183 			case VSNORMAL:
    184 				putc('}', fp);
    185 				break;
    186 			case VSMINUS:
    187 				putc('-', fp);
    188 				break;
    189 			case VSPLUS:
    190 				putc('+', fp);
    191 				break;
    192 			case VSQUESTION:
    193 				putc('?', fp);
    194 				break;
    195 			case VSASSIGN:
    196 				putc('=', fp);
    197 				break;
    198 			default:
    199 				printf("<subtype %d>", subtype);
    200 			}
    201 			break;
    202 		case CTLENDVAR:
    203 		     putc('}', fp);
    204 		     break;
    205 		case CTLBACKQ:
    206 		case CTLBACKQ|CTLQUOTE:
    207 			putc('$', fp);
    208 			putc('(', fp);
    209 			shtree(bqlist->n, -1, NULL, fp);
    210 			putc(')', fp);
    211 			break;
    212 		default:
    213 			putc(*p, fp);
    214 			break;
    215 		}
    216 	}
    217 }
    218 
    219 
    220 static
    221 indent(amount, pfx, fp)
    222 	char *pfx;
    223 	FILE *fp;
    224 	{
    225 	int i;
    226 
    227 	for (i = 0 ; i < amount ; i++) {
    228 		if (pfx && i == amount - 1)
    229 			fputs(pfx, fp);
    230 		putc('\t', fp);
    231 	}
    232 }
    233 #endif
    234 
    235 
    236 
    237 /*
    238  * Debugging stuff.
    239  */
    240 
    241 
    242 FILE *tracefile;
    243 
    244 #if DEBUG == 2
    245 int debug = 1;
    246 #else
    247 int debug = 0;
    248 #endif
    249 
    250 
    251 trputc(c) {
    252 #ifdef DEBUG
    253 	if (tracefile == NULL)
    254 		return;
    255 	putc(c, tracefile);
    256 	if (c == '\n')
    257 		fflush(tracefile);
    258 #endif
    259 }
    260 
    261 
    262 trace(fmt, a1, a2, a3, a4, a5, a6, a7, a8)
    263 	char *fmt;
    264 	{
    265 #ifdef DEBUG
    266 	if (tracefile == NULL)
    267 		return;
    268 	fprintf(tracefile, fmt, a1, a2, a3, a4, a5, a6, a7, a8);
    269 	if (strchr(fmt, '\n'))
    270 		fflush(tracefile);
    271 #endif
    272 }
    273 
    274 
    275 void
    276 trputs(s)
    277 	char *s;
    278 {
    279 #ifdef DEBUG
    280 	if (tracefile == NULL)
    281 		return;
    282 	fputs(s, tracefile);
    283 	if (strchr(s, '\n'))
    284 		fflush(tracefile);
    285 #endif
    286 }
    287 
    288 
    289 trstring(s)
    290 	char *s;
    291 	{
    292 	register char *p;
    293 	char c;
    294 
    295 #ifdef DEBUG
    296 	if (tracefile == NULL)
    297 		return;
    298 	putc('"', tracefile);
    299 	for (p = s ; *p ; p++) {
    300 		switch (*p) {
    301 		case '\n':  c = 'n';  goto backslash;
    302 		case '\t':  c = 't';  goto backslash;
    303 		case '\r':  c = 'r';  goto backslash;
    304 		case '"':  c = '"';  goto backslash;
    305 		case '\\':  c = '\\';  goto backslash;
    306 		case CTLESC:  c = 'e';  goto backslash;
    307 		case CTLVAR:  c = 'v';  goto backslash;
    308 		case CTLVAR+CTLQUOTE:  c = 'V';  goto backslash;
    309 		case CTLBACKQ:  c = 'q';  goto backslash;
    310 		case CTLBACKQ+CTLQUOTE:  c = 'Q';  goto backslash;
    311 backslash:	  putc('\\', tracefile);
    312 			putc(c, tracefile);
    313 			break;
    314 		default:
    315 			if (*p >= ' ' && *p <= '~')
    316 				putc(*p, tracefile);
    317 			else {
    318 				putc('\\', tracefile);
    319 				putc(*p >> 6 & 03, tracefile);
    320 				putc(*p >> 3 & 07, tracefile);
    321 				putc(*p & 07, tracefile);
    322 			}
    323 			break;
    324 		}
    325 	}
    326 	putc('"', tracefile);
    327 #endif
    328 }
    329 
    330 
    331 void
    332 trargs(ap)
    333 	char **ap;
    334 {
    335 #ifdef DEBUG
    336 	if (tracefile == NULL)
    337 		return;
    338 	while (*ap) {
    339 		trstring(*ap++);
    340 		if (*ap)
    341 			putc(' ', tracefile);
    342 		else
    343 			putc('\n', tracefile);
    344 	}
    345 	fflush(tracefile);
    346 #endif
    347 }
    348 
    349 
    350 void
    351 opentrace() {
    352 	char s[100];
    353 	char *p;
    354 	char *getenv();
    355 	int flags;
    356 
    357 #ifdef DEBUG
    358 	if (!debug)
    359 		return;
    360 #ifdef not_this_way
    361 	if ((p = getenv("HOME")) == NULL) {
    362 		if (geteuid() == 0)
    363 			p = "/";
    364 		else
    365 			p = "/tmp";
    366 	}
    367 	scopy(p, s);
    368 	strcat(s, "/trace");
    369 #else
    370 	scopy("./trace", s);
    371 #endif /* not_this_way */
    372 	if ((tracefile = fopen(s, "a")) == NULL) {
    373 		fprintf(stderr, "Can't open %s\n", s);
    374 		return;
    375 	}
    376 #ifdef O_APPEND
    377 	if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
    378 		fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
    379 #endif
    380 	fputs("\nTracing started.\n", tracefile);
    381 	fflush(tracefile);
    382 #endif /* DEBUG */
    383 }
    384