examples/loadables/print.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/types.h>
  35
  36 #include <errno.h>
  37 #include <limits.h>
  38 #include <stdio.h>
  39
  40 #include "bashansi.h"
  41 #include "shell.h"
  42 #include "builtins.h"
  43 #include "stdc.h"
  44 #include "bashgetopt.h"
  45
  46 #if !defined (errno)
  47 extern int errno;
  48 #endif
  49
  50 #define PF(f, func) { \
  51         if (fieldwidth) \
  52                 if (precision) \
  53                         (void)fprintf(ofp, f, fieldwidth, precision, func); \
  54                 else \
  55                         (void)fprintf(ofp, f, fieldwidth, func); \
  56         else if (precision) \
  57                 (void)fprintf(ofp, f, precision, func); \
  58         else \
  59                 (void)fprintf(ofp, f, func); \
  60 }
  61
  62 static int       asciicode __P((void));
  63 static void      escape __P((char *));
  64 static int       getchr __P((void));
  65 static double    getdouble __P((void));
  66 static int       getint __P((int *));
  67 static int       getlong __P((long *));
  68 static char     *getstr __P((void));
  69 static char     *mklong __P((char *, int));
  70 static void      usage __P((void));
  71
  72 static char **gargv;
  73
  74 int print_builtin ();
  75 static int printf_main ();
  76 static int printargs ();
  77
  78 static FILE *ofp;
  79
  80 extern char *ansicstr ();
  81 extern char *single_quote ();
  82 extern char **make_builtin_argv ();
  83
  84 extern char *this_command_name;
  85
  86 extern int optind;
  87
  88 static char *print_doc[] = {
  89   "Output the arguments.  The -f option means to use the argument as a",
  90   "format string as would be supplied to printf(1).  The rest of the",
  91   "options are as in ksh.",
  92   (char *)NULL
  93 };
  94
  95 struct builtin print_struct = {
  96         "print",
  97         print_builtin,
  98         BUILTIN_ENABLED,
  99         print_doc,
 100         "print [-Rnprs] [-u unit] [-f format] [arguments]",
 101         (char *)0
 102 };
 103
 104 #ifndef ISOPTION
 105 #define ISOPTION(s, c)  (s[0] == '-' && s[2] == '\0' && s[1] == c)
 106 #endif
 107
 108 int
 109 print_builtin (list)
 110      WORD_LIST *list;
 111 {
 112   int c, r, nflag, raw, ofd, sflag;
 113   char **v, *pfmt, *arg;
 114   WORD_LIST *l;
 115
 116   nflag = raw = sflag = 0;
 117   ofd = 1;
 118   pfmt = 0;
 119
 120   reset_internal_getopt ();
 121   while ((c = internal_getopt (list, "Rnprsu:f:")) != -1)
 122     {
 123       switch (c)
 124         {
 125         case 'R':
 126           raw = 2;
 127           loptend = lcurrent;
 128           if (loptend && ISOPTION (loptend->word->word, 'n'))
 129             {
 130               loptend = loptend->next;
 131               nflag = 1;
 132             }
 133           goto opt_end;
 134         case 'r':
 135           raw = 1;
 136           break;
 137         case 'n':
 138           nflag = 1;
 139           break;
 140         case 's':
 141           sflag = 1;
 142           break;
 143         case 'p':
 144           break;        /* NOP */
 145         case 'u':
 146           if (all_digits (list_optarg))
 147             ofd = atoi (list_optarg);
 148           else
 149             {
 150               for (l = list; l->next && l->next != lcurrent; l = l->next);
 151               lcurrent = loptend = l;
 152               goto opt_end;
 153             }
 154           break;
 155         case 'f':
 156           pfmt = list_optarg;
 157           break;
 158         default:
 159           builtin_usage ();
 160           return (EX_USAGE);
 161         }
 162     }
 163
 164 opt_end:
 165   list = loptend;
 166
 167   ofp = (ofd == 1) ? stdout : fdopen (dup (ofd), "w");
 168
 169   if (pfmt)
 170     {
 171       v = word_list_to_argv (list, 0, 2, &c);
 172       v[0] = this_command_name;
 173       v[1] = pfmt;
 174       r = printf_main (c, v);
 175       free (v);
 176       return r;
 177     }
 178
 179   if (raw)
 180     {
 181       for (l = list; l; l = l->next)
 182         {
 183           fprintf (ofp, "%s", l->word->word);
 184           if (l->next)
 185             fprintf (ofp, " ");
 186         }
 187       if (nflag == 0)
 188         fprintf (ofp, "\n");
 189       fflush (ofp);
 190       return (0);
 191     }
 192
 193   r = printargs (list, ofp);
 194   if (r && nflag == 0)
 195     fprintf (ofp, "\n");
 196   if (ofd != 1)
 197     fclose (ofp);
 198   return 0;
 199 }
 200
 201 static int printargs (list, ofp)
 202      WORD_LIST *list;
 203      FILE *ofp;
 204 {
 205   WORD_LIST *l;
 206   char *ostr;
 207   int sawc;
 208
 209   for (sawc = 0, l = list; l; l = l->next)
 210     {
 211       ostr = ansicstr (l->word->word, strlen (l->word->word), &sawc);
 212       fprintf (ofp, "%s", ostr);
 213       free (ostr);
 214       if (sawc)
 215         return (0);
 216       if (l->next)
 217         fprintf (ofp, " ");
 218     }
 219   return (1);
 220 }
 221
 222 static int
 223 printf_main(argc, argv)
 224         int argc;
 225         char *argv[];
 226 {
 227         static char *skip1, *skip2;
 228         int ch, end, fieldwidth, precision;
 229         char convch, nextch, *format, *fmt, *start;
 230
 231         while ((ch = getopt(argc, argv, "")) != EOF)
 232                 switch (ch) {
 233                 case '?':
 234                 default:
 235                         usage();
 236                         return (1);
 237                 }
 238         argc -= optind;
 239         argv += optind;
 240
 241         if (argc < 1) {
 242                 usage();
 243                 return (1);
 244         }
 245
 246         /*
 247          * Basic algorithm is to scan the format string for conversion
 248          * specifications -- once one is found, find out if the field
 249          * width or precision is a '*'; if it is, gather up value.  Note,
 250          * format strings are reused as necessary to use up the provided
 251          * arguments, arguments of zero/null string are provided to use
 252          * up the format string.
 253          */
 254         skip1 = "#-+ 0";
 255         skip2 = "*0123456789";
 256
 257         escape(fmt = format = *argv);           /* backslash interpretation */
 258         gargv = ++argv;
 259         for (;;) {
 260                 end = 0;
 261                 /* find next format specification */
 262 next:           for (start = fmt;; ++fmt) {
 263                         if (!*fmt) {
 264                                 /* avoid infinite loop */
 265                                 if (end == 1) {
 266                                         warnx("missing format character",
 267                                             NULL, NULL);
 268                                         return (1);
 269                                 }
 270                                 end = 1;
 271                                 if (fmt > start)
 272                                         (void)printf("%s", start);
 273                                 if (!*gargv)
 274                                         return (0);
 275                                 fmt = format;
 276                                 goto next;
 277                         }
 278                         /* %% prints a % */
 279                         if (*fmt == '%') {
 280                                 if (*++fmt != '%')
 281                                         break;
 282                                 *fmt++ = '\0';
 283                                 (void)printf("%s", start);
 284                                 goto next;
 285                         }
 286                 }
 287
 288                 /* skip to field width */
 289                 for (; strchr(skip1, *fmt); ++fmt);
 290                 if (*fmt == '*') {
 291                         if (getint(&fieldwidth))
 292                                 return (1);
 293                 } else
 294                         fieldwidth = 0;
 295
 296                 /* skip to possible '.', get following precision */
 297                 for (; strchr(skip2, *fmt); ++fmt);
 298                 if (*fmt == '.')
 299                         ++fmt;
 300                 if (*fmt == '*') {
 301                         if (getint(&precision))
 302                                 return (1);
 303                 } else
 304                         precision = 0;
 305
 306                 /* skip to conversion char */
 307                 for (; strchr(skip2, *fmt); ++fmt);
 308                 if (!*fmt) {
 309                         warnx("missing format character", NULL, NULL);
 310                         return (1);
 311                 }
 312
 313                 convch = *fmt;
 314                 nextch = *++fmt;
 315                 *fmt = '\0';
 316                 switch(convch) {
 317                 case 'c': {
 318                         char p;
 319
 320                         p = getchr();
 321                         PF(start, p);
 322                         break;
 323                 }
 324                 case 's': {
 325                         char *p;
 326
 327                         p = getstr();
 328                         PF(start, p);
 329                         break;
 330                 }
 331                 case 'b': {             /* expand escapes in argument */
 332                         char *p;
 333
 334                         p = getstr();
 335                         escape(p);
 336                         PF(start, p);
 337                         break;
 338                 }
 339                 case 'q': {             /* print with shell single quoting */
 340                         char *p, *p2;
 341
 342                         p = getstr();
 343                         p2 = single_quote(p);
 344                         PF(start, p2);
 345                         free(p2);
 346                         break;
 347                 }
 348                 case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
 349                         long p;
 350                         char *f;
 351
 352                         if ((f = mklong(start, convch)) == NULL)
 353                                 return (1);
 354                         if (getlong(&p))
 355                                 return (1);
 356                         PF(f, p);
 357                         break;
 358                 }
 359                 case 'e': case 'E': case 'f': case 'g': case 'G': {
 360                         double p;
 361
 362                         p = getdouble();
 363                         PF(start, p);
 364                         break;
 365                 }
 366                 default:
 367                         warnx("illegal format character", NULL, NULL);
 368                         return (1);
 369                 }
 370                 *fmt = nextch;
 371         }
 372         /* NOTREACHED */
 373 }
 374
 375 static char *
 376 mklong(str, ch)
 377         char *str;
 378         int ch;
 379 {
 380         static char copy[64];
 381         int len;
 382
 383         len = strlen(str) + 2;
 384         memmove(copy, str, len - 3);
 385         copy[len - 3] = 'l';
 386         copy[len - 2] = ch;
 387         copy[len - 1] = '\0';
 388         return (copy);
 389 }
 390
 391 static void
 392 escape(fmt)
 393         register char *fmt;
 394 {
 395         register char *store;
 396         register int value, c;
 397
 398         for (store = fmt; c = *fmt; ++fmt, ++store) {
 399                 if (c != '\\') {
 400                         *store = c;
 401                         continue;
 402                 }
 403                 switch (*++fmt) {
 404                 case '\0':              /* EOS, user error */
 405                         *store = '\\';
 406                         *++store = '\0';
 407                         return;
 408                 case '\\':              /* backslash */
 409                 case '\'':              /* single quote */
 410                         *store = *fmt;
 411                         break;
 412                 case 'a':               /* bell/alert */
 413                         *store = '\7';
 414                         break;
 415                 case 'b':               /* backspace */
 416                         *store = '\b';
 417                         break;
 418                 case 'c':
 419                         return;
 420                 case 'e':
 421                 case 'E':
 422                         *store = '\033';
 423                         break;
 424                 case 'f':               /* form-feed */
 425                         *store = '\f';
 426                         break;
 427                 case 'n':               /* newline */
 428                         *store = '\n';
 429                         break;
 430                 case 'r':               /* carriage-return */
 431                         *store = '\r';
 432                         break;
 433                 case 't':               /* horizontal tab */
 434                         *store = '\t';
 435                         break;
 436                 case 'v':               /* vertical tab */
 437                         *store = '\13';
 438                         break;
 439                                         /* octal constant */
 440                 case '0': case '1': case '2': case '3':
 441                 case '4': case '5': case '6': case '7':
 442                         for (c = 3, value = 0;
 443                             c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
 444                                 value <<= 3;
 445                                 value += *fmt - '0';
 446                         }
 447                         --fmt;
 448                         *store = value;
 449                         break;
 450                 default:
 451                         *store = *fmt;
 452                         break;
 453                 }
 454         }
 455         *store = '\0';
 456 }
 457
 458 static int
 459 getchr()
 460 {
 461         if (!*gargv)
 462                 return ('\0');
 463         return ((int)**gargv++);
 464 }
 465
 466 static char *
 467 getstr()
 468 {
 469         if (!*gargv)
 470                 return ("");
 471         return (*gargv++);
 472 }
 473
 474 static char *Number = "+-.0123456789";
 475 static int
 476 getint(ip)
 477         int *ip;
 478 {
 479         long val;
 480
 481         if (getlong(&val))
 482                 return (1);
 483         if (val > INT_MAX) {
 484                 warnx("%s: %s", *gargv, strerror(ERANGE));
 485                 return (1);
 486         }
 487         *ip = val;
 488         return (0);
 489 }
 490
 491 static int
 492 getlong(lp)
 493         long *lp;
 494 {
 495         long val;
 496         char *ep;
 497
 498         if (!*gargv) {
 499                 *lp = 0;
 500                 return (0);
 501         }
 502         if (strchr(Number, **gargv)) {
 503                 errno = 0;
 504                 val = strtol(*gargv, &ep, 0);
 505                 if (*ep != '\0') {
 506                         warnx("%s: illegal number", *gargv, NULL);
 507                         return (1);
 508                 }
 509                 if (errno == ERANGE)
 510                         if (val == LONG_MAX) {
 511                                 warnx("%s: %s", *gargv, strerror(ERANGE));
 512                                 return (1);
 513                         }
 514                         if (val == LONG_MIN) {
 515                                 warnx("%s: %s", *gargv, strerror(ERANGE));
 516                                 return (1);
 517                         }
 518
 519                 *lp = val;
 520                 ++gargv;
 521                 return (0);
 522         }
 523         *lp =  (long)asciicode();
 524         return (0);
 525 }
 526
 527 static double
 528 getdouble()
 529 {
 530         if (!*gargv)
 531                 return ((double)0);
 532         if (strchr(Number, **gargv))
 533                 return (atof(*gargv++));
 534         return ((double)asciicode());
 535 }
 536
 537 static int
 538 asciicode()
 539 {
 540         register int ch;
 541
 542         ch = **gargv;
 543         if (ch == '\'' || ch == '"')
 544                 ch = (*gargv)[1];
 545         ++gargv;
 546         return (ch);
 547 }
 548
 549 static void
 550 usage()
 551 {
 552         (void)fprintf(stderr, "usage: print [-Rnprs] [-u unit] [-f format] [arg ...]\n");
 553 }