commands/ash/show.c

   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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)show.c      8.3 (Berkeley) 5/4/95";
  36 #endif
  37 #endif /* not lint */
  38 /*
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD: src/bin/sh/show.c,v 1.21 2004/04/06 20:06:51 markm Exp $");
  41 */
  42
  43 #include <fcntl.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <stdarg.h>
  47 #include <errno.h>
  48
  49 #include "shell.h"
  50 #include "parser.h"
  51 #include "nodes.h"
  52 #include "mystring.h"
  53 #include "show.h"
  54
  55 #if DEBUG
  56 static void trputc(int c);
  57 static void shtree(union node *, int, char *, FILE*);
  58 static void shcmd(union node *, FILE *);
  59 static void sharg(union node *, FILE *);
  60 static void indent(int, char *, FILE *);
  61 static void trstring(char *);
  62 static void showtree(union node *n);
  63
  64
  65 static void
  66 showtree(union node *n)
  67 {
  68         trputs("showtree called\n");
  69         shtree(n, 1, NULL, stdout);
  70 }
  71
  72
  73 static void
  74 shtree(union node *n, int ind, char *pfx, FILE *fp)
  75 {
  76         struct nodelist *lp;
  77         char *s;
  78
  79         if (n == NULL)
  80                 return;
  81
  82         indent(ind, pfx, fp);
  83         switch(n->type) {
  84         case NSEMI:
  85                 s = "; ";
  86                 goto binop;
  87         case NAND:
  88                 s = " && ";
  89                 goto binop;
  90         case NOR:
  91                 s = " || ";
  92 binop:
  93                 shtree(n->nbinary.ch1, ind, NULL, fp);
  94            /*    if (ind < 0) */
  95                         fputs(s, fp);
  96                 shtree(n->nbinary.ch2, ind, NULL, fp);
  97                 break;
  98         case NCMD:
  99                 shcmd(n, fp);
 100                 if (ind >= 0)
 101                         putc('\n', fp);
 102                 break;
 103         case NPIPE:
 104                 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
 105                         shcmd(lp->n, fp);
 106                         if (lp->next)
 107                                 fputs(" | ", fp);
 108                 }
 109                 if (n->npipe.backgnd)
 110                         fputs(" &", fp);
 111                 if (ind >= 0)
 112                         putc('\n', fp);
 113                 break;
 114         default:
 115                 fprintf(fp, "<node type %d>", n->type);
 116                 if (ind >= 0)
 117                         putc('\n', fp);
 118                 break;
 119         }
 120 }
 121
 122
 123
 124 static void
 125 shcmd(union node *cmd, FILE *fp)
 126 {
 127         union node *np;
 128         int first;
 129         char *s;
 130         int dftfd;
 131
 132         first = 1;
 133         for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
 134                 if (! first)
 135                         putchar(' ');
 136                 sharg(np, fp);
 137                 first = 0;
 138         }
 139         for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
 140                 if (! first)
 141                         putchar(' ');
 142                 switch (np->nfile.type) {
 143                         case NTO:       s = ">";  dftfd = 1; break;
 144                         case NAPPEND:   s = ">>"; dftfd = 1; break;
 145                         case NTOFD:     s = ">&"; dftfd = 1; break;
 146                         case NCLOBBER:  s = ">|"; dftfd = 1; break;
 147                         case NFROM:     s = "<";  dftfd = 0; break;
 148                         case NFROMTO:   s = "<>"; dftfd = 0; break;
 149                         case NFROMFD:   s = "<&"; dftfd = 0; break;
 150                         default:        s = "*error*"; dftfd = 0; break;
 151                 }
 152                 if (np->nfile.fd != dftfd)
 153                         fprintf(fp, "%d", np->nfile.fd);
 154                 fputs(s, fp);
 155                 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
 156                         if (np->ndup.dupfd >= 0)
 157                                 fprintf(fp, "%d", np->ndup.dupfd);
 158                         else
 159                                 fprintf(fp, "-");
 160                 } else {
 161                         sharg(np->nfile.fname, fp);
 162                 }
 163                 first = 0;
 164         }
 165 }
 166
 167
 168
 169 static void
 170 sharg(union node *arg, FILE *fp)
 171 {
 172         char *p;
 173         struct nodelist *bqlist;
 174         int subtype;
 175
 176         if (arg->type != NARG) {
 177                 printf("<node type %d>\n", arg->type);
 178                 fflush(stdout);
 179                 abort();
 180         }
 181         bqlist = arg->narg.backquote;
 182         for (p = arg->narg.text ; *p ; p++) {
 183                 switch (*p) {
 184                 case CTLESC:
 185                         putc(*++p, fp);
 186                         break;
 187                 case CTLVAR:
 188                         putc('$', fp);
 189                         putc('{', fp);
 190                         subtype = *++p;
 191                         if (subtype == VSLENGTH)
 192                                 putc('#', fp);
 193
 194                         while (*p != '=')
 195                                 putc(*p++, fp);
 196
 197                         if (subtype & VSNUL)
 198                                 putc(':', fp);
 199
 200                         switch (subtype & VSTYPE) {
 201                         case VSNORMAL:
 202                                 putc('}', fp);
 203                                 break;
 204                         case VSMINUS:
 205                                 putc('-', fp);
 206                                 break;
 207                         case VSPLUS:
 208                                 putc('+', fp);
 209                                 break;
 210                         case VSQUESTION:
 211                                 putc('?', fp);
 212                                 break;
 213                         case VSASSIGN:
 214                                 putc('=', fp);
 215                                 break;
 216                         case VSTRIMLEFT:
 217                                 putc('#', fp);
 218                                 break;
 219                         case VSTRIMLEFTMAX:
 220                                 putc('#', fp);
 221                                 putc('#', fp);
 222                                 break;
 223                         case VSTRIMRIGHT:
 224                                 putc('%', fp);
 225                                 break;
 226                         case VSTRIMRIGHTMAX:
 227                                 putc('%', fp);
 228                                 putc('%', fp);
 229                                 break;
 230                         case VSLENGTH:
 231                                 break;
 232                         default:
 233                                 printf("<subtype %d>", subtype);
 234                         }
 235                         break;
 236                 case CTLENDVAR:
 237                      putc('}', fp);
 238                      break;
 239                 case CTLBACKQ:
 240                 case CTLBACKQ|CTLQUOTE:
 241                         putc('$', fp);
 242                         putc('(', fp);
 243                         shtree(bqlist->n, -1, NULL, fp);
 244                         putc(')', fp);
 245                         break;
 246                 default:
 247                         putc(*p, fp);
 248                         break;
 249                 }
 250         }
 251 }
 252
 253
 254 static void
 255 indent(int amount, char *pfx, FILE *fp)
 256 {
 257         int i;
 258
 259         for (i = 0 ; i < amount ; i++) {
 260                 if (pfx && i == amount - 1)
 261                         fputs(pfx, fp);
 262                 putc('\t', fp);
 263         }
 264 }
 265
 266
 267 /*
 268  * Debugging stuff.
 269  */
 270
 271
 272 FILE *tracefile;
 273
 274 #if DEBUG == 2
 275 int debug = 1;
 276 #else
 277 int debug = 0;
 278 #endif
 279
 280
 281 static void
 282 trputc(int c)
 283 {
 284         if (tracefile == NULL)
 285                 return;
 286         putc(c, tracefile);
 287         if (c == '\n')
 288                 fflush(tracefile);
 289 }
 290
 291
 292 void
 293 sh_trace(const char *fmt, ...)
 294 {
 295         va_list va;
 296         va_start(va, fmt);
 297         if (tracefile != NULL) {
 298                 (void) vfprintf(tracefile, fmt, va);
 299                 if (strchr(fmt, '\n'))
 300                         (void) fflush(tracefile);
 301         }
 302         va_end(va);
 303 }
 304
 305
 306 void
 307 trputs(char *s)
 308 {
 309         if (tracefile == NULL)
 310                 return;
 311         fputs(s, tracefile);
 312         if (strchr(s, '\n'))
 313                 fflush(tracefile);
 314 }
 315
 316
 317 static void
 318 trstring(char *s)
 319 {
 320         char *p;
 321         char c;
 322
 323         if (tracefile == NULL)
 324                 return;
 325         putc('"', tracefile);
 326         for (p = s ; *p ; p++) {
 327                 switch (*p) {
 328                 case '\n':  c = 'n';  goto backslash;
 329                 case '\t':  c = 't';  goto backslash;
 330                 case '\r':  c = 'r';  goto backslash;
 331                 case '"':  c = '"';  goto backslash;
 332                 case '\\':  c = '\\';  goto backslash;
 333                 case CTLESC:  c = 'e';  goto backslash;
 334                 case CTLVAR:  c = 'v';  goto backslash;
 335                 case CTLVAR+CTLQUOTE:  c = 'V';  goto backslash;
 336                 case CTLBACKQ:  c = 'q';  goto backslash;
 337                 case CTLBACKQ+CTLQUOTE:  c = 'Q';  goto backslash;
 338 backslash:        putc('\\', tracefile);
 339                         putc(c, tracefile);
 340                         break;
 341                 default:
 342                         if (*p >= ' ' && *p <= '~')
 343                                 putc(*p, tracefile);
 344                         else {
 345                                 putc('\\', tracefile);
 346                                 putc(*p >> 6 & 03, tracefile);
 347                                 putc(*p >> 3 & 07, tracefile);
 348                                 putc(*p & 07, tracefile);
 349                         }
 350                         break;
 351                 }
 352         }
 353         putc('"', tracefile);
 354 }
 355
 356
 357 void
 358 trargs(char **ap)
 359 {
 360         if (tracefile == NULL)
 361                 return;
 362         while (*ap) {
 363                 trstring(*ap++);
 364                 if (*ap)
 365                         putc(' ', tracefile);
 366                 else
 367                         putc('\n', tracefile);
 368         }
 369         fflush(tracefile);
 370 }
 371
 372
 373 void
 374 opentrace(void)
 375 {
 376         char s[100];
 377         int flags;
 378
 379         if (!debug)
 380                 return;
 381 #ifdef not_this_way
 382         {
 383                 char *p;
 384                 if ((p = getenv("HOME")) == NULL) {
 385                         if (geteuid() == 0)
 386                                 p = "/";
 387                         else
 388                                 p = "/tmp";
 389                 }
 390                 scopy(p, s);
 391                 strcat(s, "/trace");
 392         }
 393 #else
 394         scopy("./trace", s);
 395 #endif /* not_this_way */
 396         if ((tracefile = fopen(s, "a")) == NULL) {
 397                 fprintf(stderr, "Can't open %s: %s\n", s, strerror(errno));
 398                 return;
 399         }
 400         if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
 401                 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
 402         fputs("\nTracing started.\n", tracefile);
 403         fflush(tracefile);
 404 }
 405 #endif /* DEBUG */
 406
 407 /*
 408  * $PchId: show.c,v 1.6 2006/05/22 12:27:51 philip Exp $
 409  */