show.c revision 1.15
1 /* $NetBSD: show.c,v 1.15 1997/07/04 21:02:22 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 1.15 1997/07/04 21:02:22 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 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 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 NAPPEND: s = ">>"; dftfd = 1; break; 157 case NTOFD: s = ">&"; dftfd = 1; break; 158 case NFROM: s = "<"; dftfd = 0; break; 159 case NFROMFD: s = "<&"; dftfd = 0; break; 160 default: s = "*error*"; dftfd = 0; break; 161 } 162 if (np->nfile.fd != dftfd) 163 fprintf(fp, "%d", np->nfile.fd); 164 fputs(s, fp); 165 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { 166 fprintf(fp, "%d", np->ndup.dupfd); 167 } else { 168 sharg(np->nfile.fname, fp); 169 } 170 first = 0; 171 } 172 } 173 174 175 176 static void 177 sharg(arg, fp) 178 union node *arg; 179 FILE *fp; 180 { 181 char *p; 182 struct nodelist *bqlist; 183 int subtype; 184 185 if (arg->type != NARG) { 186 printf("<node type %d>\n", arg->type); 187 fflush(stdout); 188 abort(); 189 } 190 bqlist = arg->narg.backquote; 191 for (p = arg->narg.text ; *p ; p++) { 192 switch (*p) { 193 case CTLESC: 194 putc(*++p, fp); 195 break; 196 case CTLVAR: 197 putc('$', fp); 198 putc('{', fp); 199 subtype = *++p; 200 if (subtype == VSLENGTH) 201 putc('#', fp); 202 203 while (*p != '=') 204 putc(*p++, fp); 205 206 if (subtype & VSNUL) 207 putc(':', fp); 208 209 switch (subtype & VSTYPE) { 210 case VSNORMAL: 211 putc('}', fp); 212 break; 213 case VSMINUS: 214 putc('-', fp); 215 break; 216 case VSPLUS: 217 putc('+', fp); 218 break; 219 case VSQUESTION: 220 putc('?', fp); 221 break; 222 case VSASSIGN: 223 putc('=', fp); 224 break; 225 case VSTRIMLEFT: 226 putc('#', fp); 227 break; 228 case VSTRIMLEFTMAX: 229 putc('#', fp); 230 putc('#', fp); 231 break; 232 case VSTRIMRIGHT: 233 putc('%', fp); 234 break; 235 case VSTRIMRIGHTMAX: 236 putc('%', fp); 237 putc('%', fp); 238 break; 239 case VSLENGTH: 240 break; 241 default: 242 printf("<subtype %d>", subtype); 243 } 244 break; 245 case CTLENDVAR: 246 putc('}', fp); 247 break; 248 case CTLBACKQ: 249 case CTLBACKQ|CTLQUOTE: 250 putc('$', fp); 251 putc('(', fp); 252 shtree(bqlist->n, -1, NULL, fp); 253 putc(')', fp); 254 break; 255 default: 256 putc(*p, fp); 257 break; 258 } 259 } 260 } 261 262 263 static void 264 indent(amount, pfx, fp) 265 int amount; 266 char *pfx; 267 FILE *fp; 268 { 269 int i; 270 271 for (i = 0 ; i < amount ; i++) { 272 if (pfx && i == amount - 1) 273 fputs(pfx, fp); 274 putc('\t', fp); 275 } 276 } 277 #endif 278 279 280 281 /* 282 * Debugging stuff. 283 */ 284 285 286 FILE *tracefile; 287 288 #if DEBUG == 2 289 int debug = 1; 290 #else 291 int debug = 0; 292 #endif 293 294 295 #ifdef DEBUG 296 void 297 trputc(c) 298 int c; 299 { 300 if (tracefile == NULL) 301 return; 302 putc(c, tracefile); 303 if (c == '\n') 304 fflush(tracefile); 305 } 306 #endif 307 308 void 309 #ifdef __STDC__ 310 trace(const char *fmt, ...) 311 #else 312 trace(va_alist) 313 va_dcl 314 #endif 315 { 316 #ifdef DEBUG 317 va_list va; 318 #ifdef __STDC__ 319 va_start(va, fmt); 320 #else 321 char *fmt; 322 va_start(va); 323 fmt = va_arg(va, char *); 324 #endif 325 if (tracefile != NULL) { 326 (void) vfprintf(tracefile, fmt, va); 327 if (strchr(fmt, '\n')) 328 (void) fflush(tracefile); 329 } 330 va_end(va); 331 #endif 332 } 333 334 335 #ifdef DEBUG 336 void 337 trputs(s) 338 char *s; 339 { 340 if (tracefile == NULL) 341 return; 342 fputs(s, tracefile); 343 if (strchr(s, '\n')) 344 fflush(tracefile); 345 } 346 347 348 static void 349 trstring(s) 350 char *s; 351 { 352 char *p; 353 char c; 354 355 if (tracefile == NULL) 356 return; 357 putc('"', tracefile); 358 for (p = s ; *p ; p++) { 359 switch (*p) { 360 case '\n': c = 'n'; goto backslash; 361 case '\t': c = 't'; goto backslash; 362 case '\r': c = 'r'; goto backslash; 363 case '"': c = '"'; goto backslash; 364 case '\\': c = '\\'; goto backslash; 365 case CTLESC: c = 'e'; goto backslash; 366 case CTLVAR: c = 'v'; goto backslash; 367 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; 368 case CTLBACKQ: c = 'q'; goto backslash; 369 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; 370 backslash: putc('\\', tracefile); 371 putc(c, tracefile); 372 break; 373 default: 374 if (*p >= ' ' && *p <= '~') 375 putc(*p, tracefile); 376 else { 377 putc('\\', tracefile); 378 putc(*p >> 6 & 03, tracefile); 379 putc(*p >> 3 & 07, tracefile); 380 putc(*p & 07, tracefile); 381 } 382 break; 383 } 384 } 385 putc('"', tracefile); 386 } 387 #endif 388 389 390 void 391 trargs(ap) 392 char **ap; 393 { 394 #ifdef DEBUG 395 if (tracefile == NULL) 396 return; 397 while (*ap) { 398 trstring(*ap++); 399 if (*ap) 400 putc(' ', tracefile); 401 else 402 putc('\n', tracefile); 403 } 404 fflush(tracefile); 405 #endif 406 } 407 408 409 #ifdef DEBUG 410 void 411 opentrace() { 412 char s[100]; 413 char *getenv(); 414 #ifdef O_APPEND 415 int flags; 416 #endif 417 418 if (!debug) 419 return; 420 #ifdef not_this_way 421 { 422 char *p; 423 if ((p = getenv("HOME")) == NULL) { 424 if (geteuid() == 0) 425 p = "/"; 426 else 427 p = "/tmp"; 428 } 429 scopy(p, s); 430 strcat(s, "/trace"); 431 } 432 #else 433 scopy("./trace", s); 434 #endif /* not_this_way */ 435 if ((tracefile = fopen(s, "a")) == NULL) { 436 fprintf(stderr, "Can't open %s\n", s); 437 return; 438 } 439 #ifdef O_APPEND 440 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) 441 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); 442 #endif 443 fputs("\nTracing started.\n", tracefile); 444 fflush(tracefile); 445 } 446 #endif /* DEBUG */ 447
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