summaryrefslogtreecommitdiffstats
path: root/builtins/getopt.c
blob: 9529bc37d97c33e17a203fc2d3ab9f2cd97b1052 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
/* getopt.c - getopt for Bash.  Used by the getopt builtin. */

/* Copyright (C) 1993-2009 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Bash is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#if defined (HAVE_UNISTD_H)
#  ifdef _MINIX
#    include <sys/types.h>
#  endif
#  include <unistd.h>
#endif

#include <stdio.h>
#include "memalloc.h"
#include "../bashintl.h"
#include "../shell.h"
#include "getopt.h"

/* For communication from `sh_getopt' to the caller.
   When `sh_getopt' finds an option that takes an argument,
   the argument value is returned here. */
char *sh_optarg = 0;

/* Index in ARGV of the next element to be scanned.
   This is used for communication to and from the caller
   and for communication between successive calls to `sh_getopt'.

   On entry to `sh_getopt', zero means this is the first call; initialize.

   When `sh_getopt' returns EOF, this is the index of the first of the
   non-option elements that the caller should itself scan.

   Otherwise, `sh_optind' communicates from one call to the next
   how much of ARGV has been scanned so far.  */

/* XXX 1003.2 says this must be 1 before any call.  */
int sh_optind = 0;

/* Index of the current argument. */
static int sh_curopt;

/* The next char to be scanned in the option-element
   in which the last option character we returned was found.
   This allows us to pick up the scan where we left off.

   If this is zero, or a null string, it means resume the scan
   by advancing to the next ARGV-element.  */

static char *nextchar;
static int sh_charindex;

/* Callers store zero here to inhibit the error message
   for unrecognized options.  */

int sh_opterr = 1;

/* Set to an option character which was unrecognized.
   This must be initialized on some systems to avoid linking in the
   system's own getopt implementation.  */

int sh_optopt = '?';

/* Set to 1 when we see an invalid option; public so getopts can reset it. */
int sh_badopt = 0;

/* Scan elements of ARGV (whose length is ARGC) for option characters
   given in OPTSTRING.

   If an element of ARGV starts with '-', and is not exactly "-" or "--",
   then it is an option element.  The characters of this element
   (aside from the initial '-') are option characters.  If `sh_getopt'
   is called repeatedly, it returns successively each of the option characters
   from each of the option elements.

   If `sh_getopt' finds another option character, it returns that character,
   updating `sh_optind' and `nextchar' so that the next call to `sh_getopt' can
   resume the scan with the following option character or ARGV-element.

   If there are no more option characters, `sh_getopt' returns `EOF'.
   Then `sh_optind' is the index in ARGV of the first ARGV-element
   that is not an option.

   OPTSTRING is a string containing the legitimate option characters.
   If an option character is seen that is not listed in OPTSTRING,
   return '?' after printing an error message.  If you set `sh_opterr' to
   zero, the error message is suppressed but we still return '?'.

   If a char in OPTSTRING is followed by a colon, that means it wants an arg,
   so the following text in the same ARGV-element, or the text of the following
   ARGV-element, is returned in `sh_optarg'. */

/* 1003.2 specifies the format of this message.  */
#define BADOPT(x)  fprintf (stderr, _("%s: illegal option -- %c\n"), argv[0], x)
#define NEEDARG(x) fprintf (stderr, _("%s: option requires an argument -- %c\n"), argv[0], x)

int
sh_getopt (argc, argv, optstring)
     int argc;
     char *const *argv;
     const char *optstring;
{
  char c, *temp;

  sh_optarg = 0;

  if (sh_optind >= argc || sh_optind < 0)	/* XXX was sh_optind > argc */
    {
      sh_optind = argc;
      return (EOF);
    }

  /* Initialize the internal data when the first call is made.
     Start processing options with ARGV-element 1 (since ARGV-element 0
     is the program name); the sequence of previously skipped
     non-option ARGV-elements is empty.  */

  if (sh_optind == 0)
    {
      sh_optind = 1;
      nextchar = (char *)NULL;
    }

  if (nextchar == 0 || *nextchar == '\0')
    {
      /* If we have done all the ARGV-elements, stop the scan. */
      if (sh_optind >= argc)
	return EOF;

      temp = argv[sh_optind];

      /* Special ARGV-element `--' means premature end of options.
	 Skip it like a null option, and return EOF. */
      if (temp[0] == '-' && temp[1] == '-' && temp[2] == '\0')
	{
	  sh_optind++;
	  return EOF;
	}

      /* If we have come to a non-option, either stop the scan or describe
	 it to the caller and pass it by.  This makes the pseudo-option
	 `-' mean the end of options, but does not skip over it. */
      if (temp[0] != '-' || temp[1] == '\0')
	return EOF;

      /* We have found another option-ARGV-element.
	 Start decoding its characters.  */
      nextchar = argv[sh_curopt = sh_optind] + 1;
      sh_charindex = 1;
    }

  /* Look at and handle the next option-character.  */

  c = *nextchar++; sh_charindex++;
  temp = strchr (optstring, c);

  sh_optopt = c;

  /* Increment `sh_optind' when we start to process its last character.  */
  if (nextchar == 0 || *nextchar == '\0')
    {
      sh_optind++;
      nextchar = (char *)NULL;
    }

  if (sh_badopt = (temp == NULL || c == ':'))
    {
      if (sh_opterr)
	BADOPT (c);

      return '?';
    }

  if (temp[1] == ':')
    {
      if (nextchar && *nextchar)
	{
	  /* This is an option that requires an argument.  */
	  sh_optarg = nextchar;
	  /* If we end this ARGV-element by taking the rest as an arg,
	     we must advance to the next element now.  */
	  sh_optind++;
	}
      else if (sh_optind == argc)
	{
	  if (sh_opterr)
	    NEEDARG (c);

	  sh_optopt = c;
	  sh_optarg = "";	/* Needed by getopts. */
	  c = (optstring[0] == ':') ? ':' : '?';
	}
      else
	/* We already incremented `sh_optind' once;
	   increment it again when taking next ARGV-elt as argument.  */
	sh_optarg = argv[sh_optind++];
      nextchar = (char *)NULL;
    }
  return c;
}

void
sh_getopt_restore_state (argv)
     char **argv;
{
  if (nextchar)
    nextchar = argv[sh_curopt] + sh_charindex;
}

sh_getopt_state_t *
sh_getopt_alloc_istate ()
{
  sh_getopt_state_t *ret;

  ret = (sh_getopt_state_t *)xmalloc (sizeof (sh_getopt_state_t));
  return ret;
}

void
sh_getopt_dispose_istate (gs)
     sh_getopt_state_t *gs;
{
  free (gs);
}

sh_getopt_state_t *
sh_getopt_save_istate ()
{
  sh_getopt_state_t *ret;

  ret = sh_getopt_alloc_istate ();

  ret->gs_optarg = sh_optarg;
  ret->gs_optind = sh_optind;
  ret->gs_curopt = sh_curopt;
  ret->gs_nextchar = nextchar;		/* XXX */
  ret->gs_charindex = sh_charindex;
  ret->gs_flags = 0;			/* XXX for later use */

  return ret;
}

void
sh_getopt_restore_istate (state)
     sh_getopt_state_t *state;
{
  sh_optarg = state->gs_optarg;
  sh_optind = state->gs_optind;
  sh_curopt = state->gs_curopt;
  nextchar = state->gs_nextchar;	/* XXX - probably not usable */
  sh_charindex = state->gs_charindex;

  sh_getopt_dispose_istate (state);
}

#if 0
void
sh_getopt_debug_restore_state (argv)
     char **argv;
{
  if (nextchar && nextchar != argv[sh_curopt] + sh_charindex)
    {
      itrace("sh_getopt_debug_restore_state: resetting nextchar");
      nextchar = argv[sh_curopt] + sh_charindex;
    }
}
#endif
 
#ifdef TEST

/* Compile with -DTEST to make an executable for use in testing
   the above definition of `sh_getopt'.  */

int
main (argc, argv)
     int argc;
     char **argv;
{
  int c;
  int digit_sh_optind = 0;

  while (1)
    {
      int this_option_sh_optind = sh_optind ? sh_optind : 1;

      c = sh_getopt (argc, argv, "abc:d:0123456789");
      if (c == EOF)
	break;

      switch (c)
	{
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	  if (digit_sh_optind != 0 && digit_sh_optind != this_option_sh_optind)
	    printf ("digits occur in two different argv-elements.\n");
	  digit_sh_optind = this_option_sh_optind;
	  printf ("option %c\n", c);
	  break;

	case 'a':
	  printf ("option a\n");
	  break;

	case 'b':
	  printf ("option b\n");
	  break;

	case 'c':
	  printf ("option c with value `%s'\n", sh_optarg);
	  break;

	case '?':
	  break;

	default:
	  printf ("?? sh_getopt returned character code 0%o ??\n", c);
	}
    }

  if (sh_optind < argc)
    {
      printf ("non-option ARGV-elements: ");
      while (sh_optind < argc)
	printf ("%s ", argv[sh_optind++]);
      printf ("\n");
    }

  exit (0);
}

#endif /* TEST */