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 * @(#)show.c 8.3 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/show.c,v 1.11.2.3 2002/07/19 04:38:52 tjr Exp $ 38 * $DragonFly: src/bin/sh/show.c,v 1.3 2004/11/07 20:54:52 eirikn Exp $ 39 */ 40 41 #include <stdio.h> 42 #include <stdarg.h> 43 #include <errno.h> 44 45 #include "shell.h" 46 #include "parser.h" 47 #include "nodes.h" 48 #include "mystring.h" 49 #include "show.h" 50 51 52 #ifdef DEBUG 53 static void shtree(union node *, int, char *, FILE*); 54 static void shcmd(union node *, FILE *); 55 static void sharg(union node *, FILE *); 56 static void indent(int, char *, FILE *); 57 static void trstring(char *); 58 59 60 void 61 showtree(union node *n) 62 { 63 trputs("showtree called\n"); 64 shtree(n, 1, NULL, stdout); 65 } 66 67 68 static void 69 shtree(union node *n, int ind, char *pfx, FILE *fp) 70 { 71 struct nodelist *lp; 72 char *s; 73 74 if (n == NULL) 75 return; 76 77 indent(ind, pfx, fp); 78 switch(n->type) { 79 case NSEMI: 80 s = "; "; 81 goto binop; 82 case NAND: 83 s = " && "; 84 goto binop; 85 case NOR: 86 s = " || "; 87 binop: 88 shtree(n->nbinary.ch1, ind, NULL, fp); 89 /* if (ind < 0) */ 90 fputs(s, fp); 91 shtree(n->nbinary.ch2, ind, NULL, fp); 92 break; 93 case NCMD: 94 shcmd(n, fp); 95 if (ind >= 0) 96 putc('\n', fp); 97 break; 98 case NPIPE: 99 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 100 shcmd(lp->n, fp); 101 if (lp->next) 102 fputs(" | ", fp); 103 } 104 if (n->npipe.backgnd) 105 fputs(" &", fp); 106 if (ind >= 0) 107 putc('\n', fp); 108 break; 109 default: 110 fprintf(fp, "<node type %d>", n->type); 111 if (ind >= 0) 112 putc('\n', fp); 113 break; 114 } 115 } 116 117 118 119 static void 120 shcmd(union node *cmd, FILE *fp) 121 { 122 union node *np; 123 int first; 124 char *s; 125 int dftfd; 126 127 first = 1; 128 for (np = cmd->ncmd.args ; np ; np = np->narg.next) { 129 if (! first) 130 putchar(' '); 131 sharg(np, fp); 132 first = 0; 133 } 134 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) { 135 if (! first) 136 putchar(' '); 137 switch (np->nfile.type) { 138 case NTO: s = ">"; dftfd = 1; break; 139 case NAPPEND: s = ">>"; dftfd = 1; break; 140 case NTOFD: s = ">&"; dftfd = 1; break; 141 case NCLOBBER: s = ">|"; dftfd = 1; break; 142 case NFROM: s = "<"; dftfd = 0; break; 143 case NFROMTO: s = "<>"; dftfd = 0; break; 144 case NFROMFD: s = "<&"; dftfd = 0; break; 145 default: s = "*error*"; dftfd = 0; break; 146 } 147 if (np->nfile.fd != dftfd) 148 fprintf(fp, "%d", np->nfile.fd); 149 fputs(s, fp); 150 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { 151 if (np->ndup.dupfd >= 0) 152 fprintf(fp, "%d", np->ndup.dupfd); 153 else 154 fprintf(fp, "-"); 155 } else { 156 sharg(np->nfile.fname, fp); 157 } 158 first = 0; 159 } 160 } 161 162 163 164 static void 165 sharg(union node *arg, FILE *fp) 166 { 167 char *p; 168 struct nodelist *bqlist; 169 int subtype; 170 171 if (arg->type != NARG) { 172 printf("<node type %d>\n", arg->type); 173 fflush(stdout); 174 abort(); 175 } 176 bqlist = arg->narg.backquote; 177 for (p = arg->narg.text ; *p ; p++) { 178 switch (*p) { 179 case CTLESC: 180 putc(*++p, fp); 181 break; 182 case CTLVAR: 183 putc('$', fp); 184 putc('{', fp); 185 subtype = *++p; 186 if (subtype == VSLENGTH) 187 putc('#', fp); 188 189 while (*p != '=') 190 putc(*p++, fp); 191 192 if (subtype & VSNUL) 193 putc(':', fp); 194 195 switch (subtype & VSTYPE) { 196 case VSNORMAL: 197 putc('}', fp); 198 break; 199 case VSMINUS: 200 putc('-', fp); 201 break; 202 case VSPLUS: 203 putc('+', fp); 204 break; 205 case VSQUESTION: 206 putc('?', fp); 207 break; 208 case VSASSIGN: 209 putc('=', fp); 210 break; 211 case VSTRIMLEFT: 212 putc('#', fp); 213 break; 214 case VSTRIMLEFTMAX: 215 putc('#', fp); 216 putc('#', fp); 217 break; 218 case VSTRIMRIGHT: 219 putc('%', fp); 220 break; 221 case VSTRIMRIGHTMAX: 222 putc('%', fp); 223 putc('%', fp); 224 break; 225 case VSLENGTH: 226 break; 227 default: 228 printf("<subtype %d>", subtype); 229 } 230 break; 231 case CTLENDVAR: 232 putc('}', fp); 233 break; 234 case CTLBACKQ: 235 case CTLBACKQ|CTLQUOTE: 236 putc('$', fp); 237 putc('(', fp); 238 shtree(bqlist->n, -1, NULL, fp); 239 putc(')', fp); 240 break; 241 default: 242 putc(*p, fp); 243 break; 244 } 245 } 246 } 247 248 249 static void 250 indent(int amount, char *pfx, FILE *fp) 251 { 252 int i; 253 254 for (i = 0 ; i < amount ; i++) { 255 if (pfx && i == amount - 1) 256 fputs(pfx, fp); 257 putc('\t', fp); 258 } 259 } 260 261 262 /* 263 * Debugging stuff. 264 */ 265 266 267 FILE *tracefile; 268 269 #if DEBUG == 2 270 int debug = 1; 271 #else 272 int debug = 0; 273 #endif 274 275 276 void 277 trputc(int c) 278 { 279 if (tracefile == NULL) 280 return; 281 putc(c, tracefile); 282 if (c == '\n') 283 fflush(tracefile); 284 } 285 286 287 void 288 sh_trace(const char *fmt, ...) 289 { 290 va_list va; 291 va_start(va, fmt); 292 if (tracefile != NULL) { 293 vfprintf(tracefile, fmt, va); 294 if (strchr(fmt, '\n')) 295 fflush(tracefile); 296 } 297 va_end(va); 298 } 299 300 301 void 302 trputs(char *s) 303 { 304 if (tracefile == NULL) 305 return; 306 fputs(s, tracefile); 307 if (strchr(s, '\n')) 308 fflush(tracefile); 309 } 310 311 312 static void 313 trstring(char *s) 314 { 315 char *p; 316 char c; 317 318 if (tracefile == NULL) 319 return; 320 putc('"', tracefile); 321 for (p = s ; *p ; p++) { 322 switch (*p) { 323 case '\n': c = 'n'; goto backslash; 324 case '\t': c = 't'; goto backslash; 325 case '\r': c = 'r'; goto backslash; 326 case '"': c = '"'; goto backslash; 327 case '\\': c = '\\'; goto backslash; 328 case CTLESC: c = 'e'; goto backslash; 329 case CTLVAR: c = 'v'; goto backslash; 330 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; 331 case CTLBACKQ: c = 'q'; goto backslash; 332 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; 333 backslash: putc('\\', tracefile); 334 putc(c, tracefile); 335 break; 336 default: 337 if (*p >= ' ' && *p <= '~') 338 putc(*p, tracefile); 339 else { 340 putc('\\', tracefile); 341 putc(*p >> 6 & 03, tracefile); 342 putc(*p >> 3 & 07, tracefile); 343 putc(*p & 07, tracefile); 344 } 345 break; 346 } 347 } 348 putc('"', tracefile); 349 } 350 351 352 void 353 trargs(char **ap) 354 { 355 if (tracefile == NULL) 356 return; 357 while (*ap) { 358 trstring(*ap++); 359 if (*ap) 360 putc(' ', tracefile); 361 else 362 putc('\n', tracefile); 363 } 364 fflush(tracefile); 365 } 366 367 368 void 369 opentrace(void) 370 { 371 char s[100]; 372 char *getenv(); 373 #ifdef O_APPEND 374 int flags; 375 #endif 376 377 if (!debug) 378 return; 379 #ifdef not_this_way 380 { 381 char *p; 382 if ((p = getenv("HOME")) == NULL) { 383 if (geteuid() == 0) 384 p = "/"; 385 else 386 p = "/tmp"; 387 } 388 scopy(p, s); 389 strcat(s, "/trace"); 390 } 391 #else 392 scopy("./trace", s); 393 #endif /* not_this_way */ 394 if ((tracefile = fopen(s, "a")) == NULL) { 395 fprintf(stderr, "Can't open %s: %s\n", s, strerror(errno)); 396 return; 397 } 398 #ifdef O_APPEND 399 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) 400 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); 401 #endif 402 fputs("\nTracing started.\n", tracefile); 403 fflush(tracefile); 404 } 405 #endif /* DEBUG */ 406