bin/sh/show.c

   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 #ifndef lint
  36 #if 0
  37 static char sccsid[] = "@(#)show.c      8.3 (Berkeley) 5/4/95";
  38 #endif
  39 #endif /* not lint */
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD: head/bin/sh/show.c 326025 2017-11-20 19:49:47Z pfg $");
  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
  56 #ifdef DEBUG
  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
  63
  64 void
  65 showtree(union node *n)
  66 {
  67         trputs("showtree called\n");
  68         shtree(n, 1, NULL, stdout);
  69 }
  70
  71
  72 static void
  73 shtree(union node *n, int ind, char *pfx, FILE *fp)
  74 {
  75         struct nodelist *lp;
  76         char *s;
  77
  78         if (n == NULL)
  79                 return;
  80
  81         indent(ind, pfx, fp);
  82         switch(n->type) {
  83         case NSEMI:
  84                 s = "; ";
  85                 goto binop;
  86         case NAND:
  87                 s = " && ";
  88                 goto binop;
  89         case NOR:
  90                 s = " || ";
  91 binop:
  92                 shtree(n->nbinary.ch1, ind, NULL, fp);
  93            /*    if (ind < 0) */
  94                         fputs(s, fp);
  95                 shtree(n->nbinary.ch2, ind, NULL, fp);
  96                 break;
  97         case NCMD:
  98                 shcmd(n, fp);
  99                 if (ind >= 0)
 100                         putc('\n', fp);
 101                 break;
 102         case NPIPE:
 103                 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
 104                         shcmd(lp->n, fp);
 105                         if (lp->next)
 106                                 fputs(" | ", fp);
 107                 }
 108                 if (n->npipe.backgnd)
 109                         fputs(" &", fp);
 110                 if (ind >= 0)
 111                         putc('\n', fp);
 112                 break;
 113         default:
 114                 fprintf(fp, "<node type %d>", n->type);
 115                 if (ind >= 0)
 116                         putc('\n', fp);
 117                 break;
 118         }
 119 }
 120
 121
 122
 123 static void
 124 shcmd(union node *cmd, FILE *fp)
 125 {
 126         union node *np;
 127         int first;
 128         char *s;
 129         int dftfd;
 130
 131         first = 1;
 132         for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
 133                 if (! first)
 134                         putchar(' ');
 135                 sharg(np, fp);
 136                 first = 0;
 137         }
 138         for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
 139                 if (! first)
 140                         putchar(' ');
 141                 switch (np->nfile.type) {
 142                         case NTO:       s = ">";  dftfd = 1; break;
 143                         case NAPPEND:   s = ">>"; dftfd = 1; break;
 144                         case NTOFD:     s = ">&"; dftfd = 1; break;
 145                         case NCLOBBER:  s = ">|"; dftfd = 1; break;
 146                         case NFROM:     s = "<";  dftfd = 0; break;
 147                         case NFROMTO:   s = "<>"; dftfd = 0; break;
 148                         case NFROMFD:   s = "<&"; dftfd = 0; break;
 149                         case NHERE:     s = "<<"; dftfd = 0; break;
 150                         case NXHERE:    s = "<<"; dftfd = 0; break;
 151                         default:        s = "*error*"; dftfd = 0; break;
 152                 }
 153                 if (np->nfile.fd != dftfd)
 154                         fprintf(fp, "%d", np->nfile.fd);
 155                 fputs(s, fp);
 156                 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
 157                         if (np->ndup.dupfd >= 0)
 158                                 fprintf(fp, "%d", np->ndup.dupfd);
 159                         else
 160                                 fprintf(fp, "-");
 161                 } else if (np->nfile.type == NHERE) {
 162                                 fprintf(fp, "HERE");
 163                 } else if (np->nfile.type == NXHERE) {
 164                                 fprintf(fp, "XHERE");
 165                 } else {
 166                         sharg(np->nfile.fname, fp);
 167                 }
 168                 first = 0;
 169         }
 170 }
 171
 172
 173
 174 static void
 175 sharg(union node *arg, FILE *fp)
 176 {
 177         char *p;
 178         struct nodelist *bqlist;
 179         int subtype;
 180
 181         if (arg->type != NARG) {
 182                 printf("<node type %d>\n", arg->type);
 183                 fflush(stdout);
 184                 abort();
 185         }
 186         bqlist = arg->narg.backquote;
 187         for (p = arg->narg.text ; *p ; p++) {
 188                 switch (*p) {
 189                 case CTLESC:
 190                         putc(*++p, fp);
 191                         break;
 192                 case CTLVAR:
 193                         putc('$', fp);
 194                         putc('{', fp);
 195                         subtype = *++p;
 196                         if (subtype == VSLENGTH)
 197                                 putc('#', fp);
 198
 199                         while (*p != '=')
 200                                 putc(*p++, fp);
 201
 202                         if (subtype & VSNUL)
 203                                 putc(':', fp);
 204
 205                         switch (subtype & VSTYPE) {
 206                         case VSNORMAL:
 207                                 putc('}', fp);
 208                                 break;
 209                         case VSMINUS:
 210                                 putc('-', fp);
 211                                 break;
 212                         case VSPLUS:
 213                                 putc('+', fp);
 214                                 break;
 215                         case VSQUESTION:
 216                                 putc('?', fp);
 217                                 break;
 218                         case VSASSIGN:
 219                                 putc('=', fp);
 220                                 break;
 221                         case VSTRIMLEFT:
 222                                 putc('#', fp);
 223                                 break;
 224                         case VSTRIMLEFTMAX:
 225                                 putc('#', fp);
 226                                 putc('#', fp);
 227                                 break;
 228                         case VSTRIMRIGHT:
 229                                 putc('%', fp);
 230                                 break;
 231                         case VSTRIMRIGHTMAX:
 232                                 putc('%', fp);
 233                                 putc('%', fp);
 234                                 break;
 235                         case VSLENGTH:
 236                                 break;
 237                         default:
 238                                 printf("<subtype %d>", subtype);
 239                         }
 240                         break;
 241                 case CTLENDVAR:
 242                      putc('}', fp);
 243                      break;
 244                 case CTLBACKQ:
 245                 case CTLBACKQ|CTLQUOTE:
 246                         putc('$', fp);
 247                         putc('(', fp);
 248                         shtree(bqlist->n, -1, NULL, fp);
 249                         putc(')', fp);
 250                         break;
 251                 default:
 252                         putc(*p, fp);
 253                         break;
 254                 }
 255         }
 256 }
 257
 258
 259 static void
 260 indent(int amount, char *pfx, FILE *fp)
 261 {
 262         int i;
 263
 264         for (i = 0 ; i < amount ; i++) {
 265                 if (pfx && i == amount - 1)
 266                         fputs(pfx, fp);
 267                 putc('\t', fp);
 268         }
 269 }
 270
 271
 272 /*
 273  * Debugging stuff.
 274  */
 275
 276
 277 FILE *tracefile;
 278
 279 #if DEBUG >= 2
 280 int debug = 1;
 281 #else
 282 int debug = 0;
 283 #endif
 284
 285
 286 void
 287 trputc(int c)
 288 {
 289         if (tracefile == NULL)
 290                 return;
 291         putc(c, tracefile);
 292         if (c == '\n')
 293                 fflush(tracefile);
 294 }
 295
 296
 297 void
 298 sh_trace(const char *fmt, ...)
 299 {
 300         va_list va;
 301         va_start(va, fmt);
 302         if (tracefile != NULL) {
 303                 (void) vfprintf(tracefile, fmt, va);
 304                 if (strchr(fmt, '\n'))
 305                         (void) fflush(tracefile);
 306         }
 307         va_end(va);
 308 }
 309
 310
 311 void
 312 trputs(const char *s)
 313 {
 314         if (tracefile == NULL)
 315                 return;
 316         fputs(s, tracefile);
 317         if (strchr(s, '\n'))
 318                 fflush(tracefile);
 319 }
 320
 321
 322 static void
 323 trstring(char *s)
 324 {
 325         char *p;
 326         char c;
 327
 328         if (tracefile == NULL)
 329                 return;
 330         putc('"', tracefile);
 331         for (p = s ; *p ; p++) {
 332                 switch (*p) {
 333                 case '\n':  c = 'n';  goto backslash;
 334                 case '\t':  c = 't';  goto backslash;
 335                 case '\r':  c = 'r';  goto backslash;
 336                 case '"':  c = '"';  goto backslash;
 337                 case '\\':  c = '\\';  goto backslash;
 338                 case CTLESC:  c = 'e';  goto backslash;
 339                 case CTLVAR:  c = 'v';  goto backslash;
 340                 case CTLVAR+CTLQUOTE:  c = 'V';  goto backslash;
 341                 case CTLBACKQ:  c = 'q';  goto backslash;
 342                 case CTLBACKQ+CTLQUOTE:  c = 'Q';  goto backslash;
 343 backslash:        putc('\\', tracefile);
 344                         putc(c, tracefile);
 345                         break;
 346                 default:
 347                         if (*p >= ' ' && *p <= '~')
 348                                 putc(*p, tracefile);
 349                         else {
 350                                 putc('\\', tracefile);
 351                                 putc(*p >> 6 & 03, tracefile);
 352                                 putc(*p >> 3 & 07, tracefile);
 353                                 putc(*p & 07, tracefile);
 354                         }
 355                         break;
 356                 }
 357         }
 358         putc('"', tracefile);
 359 }
 360
 361
 362 void
 363 trargs(char **ap)
 364 {
 365         if (tracefile == NULL)
 366                 return;
 367         while (*ap) {
 368                 trstring(*ap++);
 369                 if (*ap)
 370                         putc(' ', tracefile);
 371                 else
 372                         putc('\n', tracefile);
 373         }
 374         fflush(tracefile);
 375 }
 376
 377
 378 void
 379 opentrace(void)
 380 {
 381         char s[100];
 382         int flags;
 383
 384         if (!debug)
 385                 return;
 386 #ifdef not_this_way
 387         {
 388                 char *p;
 389                 if ((p = getenv("HOME")) == NULL) {
 390                         if (geteuid() == 0)
 391                                 p = "/";
 392                         else
 393                                 p = "/tmp";
 394                 }
 395                 strcpy(s, p);
 396                 strcat(s, "/trace");
 397         }
 398 #else
 399         strcpy(s, "./trace");
 400 #endif /* not_this_way */
 401         if ((tracefile = fopen(s, "a")) == NULL) {
 402                 fprintf(stderr, "Can't open %s: %s\n", s, strerror(errno));
 403                 return;
 404         }
 405         if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
 406                 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
 407         fputs("\nTracing started.\n", tracefile);
 408         fflush(tracefile);
 409 }
 410 #endif /* DEBUG */