show.c revision 1.21
1 /* $NetBSD: show.c,v 1.21 2002/05/15 16:33:35 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)show.c 8.3 (Berkeley) 5/4/95"; 43 #else 44 __RCSID("$NetBSD: show.c,v 1.21 2002/05/15 16:33:35 christos Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 #include <stdio.h> 49 #ifdef __STDC__ 50 #include <stdarg.h> 51 #else 52 #include <varargs.h> 53 #endif 54 55 #include "shell.h" 56 #include "parser.h" 57 #include "nodes.h" 58 #include "mystring.h" 59 #include "show.h" 60 61 62 #ifdef DEBUG 63 static void shtree __P((union node *, int, char *, FILE*)); 64 static void shcmd __P((union node *, FILE *)); 65 static void sharg __P((union node *, FILE *)); 66 static void indent __P((int, char *, FILE *)); 67 static void trstring __P((char *)); 68 69 70 void 71 showtree(n) 72 union node *n; 73 { 74 trputs("showtree called\n"); 75 shtree(n, 1, NULL, stdout); 76 } 77 78 79 static void 80 shtree(n, ind, pfx, fp) 81 union node *n; 82 int ind; 83 char *pfx; 84 FILE *fp; 85 { 86 struct nodelist *lp; 87 const char *s; 88 89 if (n == NULL) 90 return; 91 92 indent(ind, pfx, fp); 93 switch(n->type) { 94 case NSEMI: 95 s = "; "; 96 goto binop; 97 case NAND: 98 s = " && "; 99 goto binop; 100 case NOR: 101 s = " || "; 102 binop: 103 shtree(n->nbinary.ch1, ind, NULL, fp); 104 /* if (ind < 0) */ 105 fputs(s, fp); 106 shtree(n->nbinary.ch2, ind, NULL, fp); 107 break; 108 case NCMD: 109 shcmd(n, fp); 110 if (ind >= 0) 111 putc('\n', fp); 112 break; 113 case NPIPE: 114 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 115 shcmd(lp->n, fp); 116 if (lp->next) 117 fputs(" | ", fp); 118 } 119 if (n->npipe.backgnd) 120 fputs(" &", fp); 121 if (ind >= 0) 122 putc('\n', fp); 123 break; 124 default: 125 fprintf(fp, "<node type %d>", n->type); 126 if (ind >= 0) 127 putc('\n', fp); 128 break; 129 } 130 } 131 132 133 134 static void 135 shcmd(cmd, fp) 136 union node *cmd; 137 FILE *fp; 138 { 139 union node *np; 140 int first; 141 const char *s; 142 int dftfd; 143 144 first = 1; 145 for (np = cmd->ncmd.args ; np ; np = np->narg.next) { 146 if (! first) 147 putchar(' '); 148 sharg(np, fp); 149 first = 0; 150 } 151 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) { 152 if (! first) 153 putchar(' '); 154 switch (np->nfile.type) { 155 case NTO: s = ">"; dftfd = 1; break; 156 case NCLOBBER: s = ">|"; dftfd = 1; break; 157 case NAPPEND: s = ">>"; dftfd = 1; break; 158 case NTOFD: s = ">&"; dftfd = 1; break; 159 case NFROM: s = "<"; dftfd = 0; break; 160 case NFROMFD: s = "<&"; dftfd = 0; break; 161 case NFROMTO: s = "<>"; dftfd = 0; break; 162 default: s = "*error*"; dftfd = 0; break; 163 } 164 if (np->nfile.fd != dftfd) 165 fprintf(fp, "%d", np->nfile.fd); 166 fputs(s, fp); 167 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { 168 fprintf(fp, "%d", np->ndup.dupfd); 169 } else { 170 sharg(np->nfile.fname, fp); 171 } 172 first = 0; 173 } 174 } 175 176 177 178 static void 179 sharg(arg, fp) 180 union node *arg; 181 FILE *fp; 182 { 183 char *p; 184 struct nodelist *bqlist; 185 int subtype; 186 187 if (arg->type != NARG) { 188 printf("<node type %d>\n", arg->type); 189 fflush(stdout); 190 abort(); 191 } 192 bqlist = arg->narg.backquote; 193 for (p = arg->narg.text ; *p ; p++) { 194 switch (*p) { 195 case CTLESC: 196 putc(*++p, fp); 197 break; 198 case CTLVAR: 199 putc('$', fp); 200 putc('{', fp); 201 subtype = *++p; 202 if (subtype == VSLENGTH) 203 putc('#', fp); 204 205 while (*p != '=') 206 putc(*p++, fp); 207 208 if (subtype & VSNUL) 209 putc(':', fp); 210 211 switch (subtype & VSTYPE) { 212 case VSNORMAL: 213 putc('}', fp); 214 break; 215 case VSMINUS: 216 putc('-', fp); 217 break; 218 case VSPLUS: 219 putc('+', fp); 220 break; 221 case VSQUESTION: 222 putc('?', fp); 223 break; 224 case VSASSIGN: 225 putc('=', fp); 226 break; 227 case VSTRIMLEFT: 228 putc('#', fp); 229 break; 230 case VSTRIMLEFTMAX: 231 putc('#', fp); 232 putc('#', fp); 233 break; 234 case VSTRIMRIGHT: 235 putc('%', fp); 236 break; 237 case VSTRIMRIGHTMAX: 238 putc('%', fp); 239 putc('%', fp); 240 break; 241 case VSLENGTH: 242 break; 243 default: 244 printf("<subtype %d>", subtype); 245 } 246 break; 247 case CTLENDVAR: 248 putc('}', fp); 249 break; 250 case CTLBACKQ: 251 case CTLBACKQ|CTLQUOTE: 252 putc('$', fp); 253 putc('(', fp); 254 shtree(bqlist->n, -1, NULL, fp); 255 putc(')', fp); 256 break; 257 default: 258 putc(*p, fp); 259 break; 260 } 261 } 262 } 263 264 265 static void 266 indent(amount, pfx, fp) 267 int amount; 268 char *pfx; 269 FILE *fp; 270 { 271 int i; 272 273 for (i = 0 ; i < amount ; i++) { 274 if (pfx && i == amount - 1) 275 fputs(pfx, fp); 276 putc('\t', fp); 277 } 278 } 279 #endif 280 281 282 283 /* 284 * Debugging stuff. 285 */ 286 287 288 FILE *tracefile; 289 290 #if DEBUG == 2 291 int debug = 1; 292 #else 293 int debug = 0; 294 #endif 295 296 297 #ifdef DEBUG 298 void 299 trputc(c) 300 int c; 301 { 302 if (tracefile == NULL) 303 return; 304 putc(c, tracefile); 305 if (c == '\n') 306 fflush(tracefile); 307 } 308 #endif 309 310 void 311 #ifdef __STDC__ 312 trace(const char *fmt, ...) 313 #else 314 trace(va_alist) 315 va_dcl 316 #endif 317 { 318 #ifdef DEBUG 319 va_list va; 320 #ifdef __STDC__ 321 va_start(va, fmt); 322 #else 323 char *fmt; 324 va_start(va); 325 fmt = va_arg(va, char *); 326 #endif 327 if (tracefile != NULL) { 328 (void) vfprintf(tracefile, fmt, va); 329 if (strchr(fmt, '\n')) 330 (void) fflush(tracefile); 331 } 332 va_end(va); 333 #endif 334 } 335 336 337 #ifdef DEBUG 338 void 339 trputs(s) 340 const char *s; 341 { 342 if (tracefile == NULL) 343 return; 344 fputs(s, tracefile); 345 if (strchr(s, '\n')) 346 fflush(tracefile); 347 } 348 349 350 static void 351 trstring(s) 352 char *s; 353 { 354 char *p; 355 char c; 356 357 if (tracefile == NULL) 358 return; 359 putc('"', tracefile); 360 for (p = s ; *p ; p++) { 361 switch (*p) { 362 case '\n': c = 'n'; goto backslash; 363 case '\t': c = 't'; goto backslash; 364 case '\r': c = 'r'; goto backslash; 365 case '"': c = '"'; goto backslash; 366 case '\\': c = '\\'; goto backslash; 367 case CTLESC: c = 'e'; goto backslash; 368 case CTLVAR: c = 'v'; goto backslash; 369 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; 370 case CTLBACKQ: c = 'q'; goto backslash; 371 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; 372 backslash: putc('\\', tracefile); 373 putc(c, tracefile); 374 break; 375 default: 376 if (*p >= ' ' && *p <= '~') 377 putc(*p, tracefile); 378 else { 379 putc('\\', tracefile); 380 putc(*p >> 6 & 03, tracefile); 381 putc(*p >> 3 & 07, tracefile); 382 putc(*p & 07, tracefile); 383 } 384 break; 385 } 386 } 387 putc('"', tracefile); 388 } 389 #endif 390 391 392 void 393 trargs(ap) 394 char **ap; 395 { 396 #ifdef DEBUG 397 if (tracefile == NULL) 398 return; 399 while (*ap) { 400 trstring(*ap++); 401 if (*ap) 402 putc(' ', tracefile); 403 else 404 putc('\n', tracefile); 405 } 406 fflush(tracefile); 407 #endif 408 } 409 410 411 #ifdef DEBUG 412 void 413 opentrace() { 414 char s[100]; 415 #ifdef O_APPEND 416 int flags; 417 #endif 418 419 if (!debug) 420 return; 421 #ifdef not_this_way 422 { 423 char *p; 424 if ((p = getenv("HOME")) == NULL) { 425 if (geteuid() == 0) 426 p = "/"; 427 else 428 p = "/tmp"; 429 } 430 scopy(p, s); 431 strcat(s, "/trace"); 432 } 433 #else 434 scopy("./trace", s); 435 #endif /* not_this_way */ 436 if ((tracefile = fopen(s, "a")) == NULL) { 437 fprintf(stderr, "Can't open %s\n", s); 438 return; 439 } 440 #ifdef O_APPEND 441 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) 442 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); 443 #endif 444 fputs("\nTracing started.\n", tracefile); 445 fflush(tracefile); 446 } 447 #endif /* DEBUG */ 448
Indexes created Wed Sep 24 15:09:51 GMT 2025