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 * $Id$ 37 */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)show.c 8.1 (Berkeley) 5/31/93"; 41 #endif /* not lint */ 42 43 #include <stdio.h> 44 #include "shell.h" 45 #include "parser.h" 46 #include "nodes.h" 47 #include "mystring.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 trputs(s) 276 char *s; 277 { 278 #ifdef DEBUG 279 if (tracefile == NULL) 280 return; 281 fputs(s, tracefile); 282 if (strchr(s, '\n')) 283 fflush(tracefile); 284 #endif 285 } 286 287 288 trstring(s) 289 char *s; 290 { 291 register char *p; 292 char c; 293 294 #ifdef DEBUG 295 if (tracefile == NULL) 296 return; 297 putc('"', tracefile); 298 for (p = s ; *p ; p++) { 299 switch (*p) { 300 case '\n': c = 'n'; goto backslash; 301 case '\t': c = 't'; goto backslash; 302 case '\r': c = 'r'; goto backslash; 303 case '"': c = '"'; goto backslash; 304 case '\\': c = '\\'; goto backslash; 305 case CTLESC: c = 'e'; goto backslash; 306 case CTLVAR: c = 'v'; goto backslash; 307 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; 308 case CTLBACKQ: c = 'q'; goto backslash; 309 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; 310 backslash: putc('\\', tracefile); 311 putc(c, tracefile); 312 break; 313 default: 314 if (*p >= ' ' && *p <= '~') 315 putc(*p, tracefile); 316 else { 317 putc('\\', tracefile); 318 putc(*p >> 6 & 03, tracefile); 319 putc(*p >> 3 & 07, tracefile); 320 putc(*p & 07, tracefile); 321 } 322 break; 323 } 324 } 325 putc('"', tracefile); 326 #endif 327 } 328 329 330 trargs(ap) 331 char **ap; 332 { 333 #ifdef DEBUG 334 if (tracefile == NULL) 335 return; 336 while (*ap) { 337 trstring(*ap++); 338 if (*ap) 339 putc(' ', tracefile); 340 else 341 putc('\n', tracefile); 342 } 343 fflush(tracefile); 344 #endif 345 } 346 347 348 opentrace() { 349 char s[100]; 350 char *p; 351 char *getenv(); 352 int flags; 353 354 #ifdef DEBUG 355 if (!debug) 356 return; 357 #ifdef not_this_way 358 if ((p = getenv("HOME")) == NULL) { 359 if (geteuid() == 0) 360 p = "/"; 361 else 362 p = "/tmp"; 363 } 364 scopy(p, s); 365 strcat(s, "/trace"); 366 #else 367 scopy("./trace", s); 368 #endif /* not_this_way */ 369 if ((tracefile = fopen(s, "a")) == NULL) { 370 fprintf(stderr, "Can't open %s\n", s); 371 return; 372 } 373 #ifdef O_APPEND 374 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) 375 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); 376 #endif 377 fputs("\nTracing started.\n", tracefile); 378 fflush(tracefile); 379 #endif /* DEBUG */ 380 } 381