1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <fcntl.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <stdarg.h> 39 #include <errno.h> 40 41 #include "shell.h" 42 #include "parser.h" 43 #include "nodes.h" 44 #include "mystring.h" 45 #include "show.h" 46 47 48 #ifdef DEBUG 49 static void shtree(union node *, int, char *, FILE*); 50 static void shcmd(union node *, FILE *); 51 static void sharg(union node *, FILE *); 52 static void indent(int, char *, FILE *); 53 static void trstring(char *); 54 55 56 void 57 showtree(union node *n) 58 { 59 trputs("showtree called\n"); 60 shtree(n, 1, NULL, stdout); 61 } 62 63 64 static void 65 shtree(union node *n, int ind, char *pfx, FILE *fp) 66 { 67 struct nodelist *lp; 68 const char *s; 69 70 if (n == NULL) 71 return; 72 73 indent(ind, pfx, fp); 74 switch(n->type) { 75 case NSEMI: 76 s = "; "; 77 goto binop; 78 case NAND: 79 s = " && "; 80 goto binop; 81 case NOR: 82 s = " || "; 83 binop: 84 shtree(n->nbinary.ch1, ind, NULL, fp); 85 /* if (ind < 0) */ 86 fputs(s, fp); 87 shtree(n->nbinary.ch2, ind, NULL, fp); 88 break; 89 case NCMD: 90 shcmd(n, fp); 91 if (ind >= 0) 92 putc('\n', fp); 93 break; 94 case NPIPE: 95 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 96 shcmd(lp->n, fp); 97 if (lp->next) 98 fputs(" | ", fp); 99 } 100 if (n->npipe.backgnd) 101 fputs(" &", fp); 102 if (ind >= 0) 103 putc('\n', fp); 104 break; 105 default: 106 fprintf(fp, "<node type %d>", n->type); 107 if (ind >= 0) 108 putc('\n', fp); 109 break; 110 } 111 } 112 113 114 115 static void 116 shcmd(union node *cmd, FILE *fp) 117 { 118 union node *np; 119 int first; 120 const 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 NCLOBBER: s = ">|"; dftfd = 1; break; 138 case NFROM: s = "<"; dftfd = 0; break; 139 case NFROMTO: s = "<>"; dftfd = 0; break; 140 case NFROMFD: s = "<&"; dftfd = 0; break; 141 case NHERE: s = "<<"; dftfd = 0; break; 142 case NXHERE: s = "<<"; dftfd = 0; break; 143 default: s = "*error*"; dftfd = 0; break; 144 } 145 if (np->nfile.fd != dftfd) 146 fprintf(fp, "%d", np->nfile.fd); 147 fputs(s, fp); 148 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { 149 if (np->ndup.dupfd >= 0) 150 fprintf(fp, "%d", np->ndup.dupfd); 151 else 152 fprintf(fp, "-"); 153 } else if (np->nfile.type == NHERE) { 154 fprintf(fp, "HERE"); 155 } else if (np->nfile.type == NXHERE) { 156 fprintf(fp, "XHERE"); 157 } else { 158 sharg(np->nfile.fname, fp); 159 } 160 first = 0; 161 } 162 } 163 164 165 166 static void 167 sharg(union node *arg, FILE *fp) 168 { 169 char *p; 170 struct nodelist *bqlist; 171 int subtype; 172 173 if (arg->type != NARG) { 174 printf("<node type %d>\n", arg->type); 175 fflush(stdout); 176 abort(); 177 } 178 bqlist = arg->narg.backquote; 179 for (p = arg->narg.text ; *p ; p++) { 180 switch (*p) { 181 case CTLESC: 182 putc(*++p, fp); 183 break; 184 case CTLVAR: 185 putc('$', fp); 186 putc('{', fp); 187 subtype = *++p; 188 if (subtype == VSLENGTH) 189 putc('#', fp); 190 191 while (*p != '=') 192 putc(*p++, fp); 193 194 if (subtype & VSNUL) 195 putc(':', fp); 196 197 switch (subtype & VSTYPE) { 198 case VSNORMAL: 199 putc('}', fp); 200 break; 201 case VSMINUS: 202 putc('-', fp); 203 break; 204 case VSPLUS: 205 putc('+', fp); 206 break; 207 case VSQUESTION: 208 putc('?', fp); 209 break; 210 case VSASSIGN: 211 putc('=', fp); 212 break; 213 case VSTRIMLEFT: 214 putc('#', fp); 215 break; 216 case VSTRIMLEFTMAX: 217 putc('#', fp); 218 putc('#', fp); 219 break; 220 case VSTRIMRIGHT: 221 putc('%', fp); 222 break; 223 case VSTRIMRIGHTMAX: 224 putc('%', fp); 225 putc('%', fp); 226 break; 227 case VSLENGTH: 228 break; 229 default: 230 printf("<subtype %d>", subtype); 231 } 232 break; 233 case CTLENDVAR: 234 putc('}', fp); 235 break; 236 case CTLBACKQ: 237 case CTLBACKQ|CTLQUOTE: 238 putc('$', fp); 239 putc('(', fp); 240 shtree(bqlist->n, -1, NULL, fp); 241 putc(')', fp); 242 break; 243 default: 244 putc(*p, fp); 245 break; 246 } 247 } 248 } 249 250 251 static void 252 indent(int amount, char *pfx, FILE *fp) 253 { 254 int i; 255 256 for (i = 0 ; i < amount ; i++) { 257 if (pfx && i == amount - 1) 258 fputs(pfx, fp); 259 putc('\t', fp); 260 } 261 } 262 263 264 /* 265 * Debugging stuff. 266 */ 267 268 269 static FILE *tracefile; 270 #if DEBUG >= 2 271 int debug = 1; 272 #else 273 int debug = 0; 274 #endif 275 276 277 void 278 trputc(int c) 279 { 280 if (tracefile == NULL) 281 return; 282 putc(c, tracefile); 283 if (c == '\n') 284 fflush(tracefile); 285 } 286 287 288 void 289 sh_trace(const char *fmt, ...) 290 { 291 va_list va; 292 va_start(va, fmt); 293 if (tracefile != NULL) { 294 (void) vfprintf(tracefile, fmt, va); 295 if (strchr(fmt, '\n')) 296 (void) fflush(tracefile); 297 } 298 va_end(va); 299 } 300 301 302 void 303 trputs(const char *s) 304 { 305 if (tracefile == NULL) 306 return; 307 fputs(s, tracefile); 308 if (strchr(s, '\n')) 309 fflush(tracefile); 310 } 311 312 313 static void 314 trstring(char *s) 315 { 316 char *p; 317 char c; 318 319 if (tracefile == NULL) 320 return; 321 putc('"', tracefile); 322 for (p = s ; *p ; p++) { 323 switch (*p) { 324 case '\n': c = 'n'; goto backslash; 325 case '\t': c = 't'; goto backslash; 326 case '\r': c = 'r'; goto backslash; 327 case '"': c = '"'; goto backslash; 328 case '\\': c = '\\'; goto backslash; 329 case CTLESC: c = 'e'; goto backslash; 330 case CTLVAR: c = 'v'; goto backslash; 331 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; 332 case CTLBACKQ: c = 'q'; goto backslash; 333 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; 334 backslash: putc('\\', tracefile); 335 putc(c, tracefile); 336 break; 337 default: 338 if (*p >= ' ' && *p <= '~') 339 putc(*p, tracefile); 340 else { 341 putc('\\', tracefile); 342 putc(*p >> 6 & 03, tracefile); 343 putc(*p >> 3 & 07, tracefile); 344 putc(*p & 07, tracefile); 345 } 346 break; 347 } 348 } 349 putc('"', tracefile); 350 } 351 352 353 void 354 trargs(char **ap) 355 { 356 if (tracefile == NULL) 357 return; 358 while (*ap) { 359 trstring(*ap++); 360 if (*ap) 361 putc(' ', tracefile); 362 else 363 putc('\n', tracefile); 364 } 365 fflush(tracefile); 366 } 367 368 369 void 370 opentrace(void) 371 { 372 char s[100]; 373 int flags; 374 375 if (!debug) 376 return; 377 #ifdef not_this_way 378 { 379 char *p; 380 if ((p = getenv("HOME")) == NULL) { 381 if (geteuid() == 0) 382 p = "/"; 383 else 384 p = "/tmp"; 385 } 386 strcpy(s, p); 387 strcat(s, "/trace"); 388 } 389 #else 390 strcpy(s, "./trace"); 391 #endif /* not_this_way */ 392 if ((tracefile = fopen(s, "a")) == NULL) { 393 fprintf(stderr, "Can't open %s: %s\n", s, strerror(errno)); 394 return; 395 } 396 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) 397 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); 398 fputs("\nTracing started.\n", tracefile); 399 fflush(tracefile); 400 } 401 #endif /* DEBUG */ 402