1 This file is getopts.def, from which is created getopts.c.
2 It implements the builtin "getopts" in Bash.
4 Copyright (C) 1987-2004 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Bash is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Bash. If not, see <http://www.gnu.org/licenses/>.
24 $FUNCTION getopts_builtin
25 $SHORT_DOC getopts optstring name [arg]
26 Parse option arguments.
28 Getopts is used by shell procedures to parse positional parameters
31 OPTSTRING contains the option letters to be recognized; if a letter
32 is followed by a colon, the option is expected to have an argument,
33 which should be separated from it by white space.
35 Each time it is invoked, getopts will place the next option in the
36 shell variable $name, initializing name if it does not exist, and
37 the index of the next argument to be processed into the shell
38 variable OPTIND. OPTIND is initialized to 1 each time the shell or
39 a shell script is invoked. When an option requires an argument,
40 getopts places that argument into the shell variable OPTARG.
42 getopts reports errors in one of two ways. If the first character
43 of OPTSTRING is a colon, getopts uses silent error reporting. In
44 this mode, no error messages are printed. If an invalid option is
45 seen, getopts places the option character found into OPTARG. If a
46 required argument is not found, getopts places a ':' into NAME and
47 sets OPTARG to the option character found. If getopts is not in
48 silent mode, and an invalid option is seen, getopts places '?' into
49 NAME and unsets OPTARG. If a required argument is not found, a '?'
50 is placed in NAME, OPTARG is unset, and a diagnostic message is
53 If the shell variable OPTERR has the value 0, getopts disables the
54 printing of error messages, even if the first character of
55 OPTSTRING is not a colon. OPTERR has the value 1 by default.
57 Getopts normally parses the positional parameters ($0 - $9), but if
58 more arguments are given, they are parsed instead.
61 Returns success if an option is found; fails if the end of options is
62 encountered or an error occurs.
69 #if defined (HAVE_UNISTD_H)
71 # include <sys/types.h>
76 #include "../bashansi.h"
80 #include "bashgetopt.h"
84 #define G_INVALID_OPT -2
85 #define G_ARG_MISSING -3
87 extern char *this_command_name;
89 static int getopts_bind_variable __P((char *, char *));
90 static int dogetopts __P((int, char **));
92 /* getopts_reset is magic code for when OPTIND is reset. N is the
93 value that has just been assigned to OPTIND. */
95 getopts_reset (newind)
103 getopts_bind_variable (name, value)
108 if (legal_identifier (name))
110 v = bind_variable (name, value, 0);
111 if (v && (readonly_p (v) || noassign_p (v)))
112 return (EX_MISCERROR);
113 return (v ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
118 return (EXECUTION_FAILURE);
122 /* Error handling is now performed as specified by Posix.2, draft 11
123 (identical to that of ksh-88). The special handling is enabled if
124 the first character of the option string is a colon; this handling
125 disables diagnostic messages concerning missing option arguments
126 and invalid option characters. The handling is as follows.
130 if (special_error) then
131 OPTARG = option character found
138 MISSING OPTION ARGUMENT;
139 if (special_error) then
141 OPTARG = option character found
150 dogetopts (argc, argv)
154 int ret, special_error, old_opterr, i, n;
155 char strval[2], numval[16];
156 char *optstr; /* list of options */
157 char *name; /* variable to get flag val */
166 /* argv[0] is "getopts". */
173 special_error = optstr[0] == ':';
177 old_opterr = sh_opterr;
179 sh_opterr = 0; /* suppress diagnostic messages */
184 sh_getopt_restore_state (argv);
186 argv[0] = dollar_vars[0];
187 ret = sh_getopt (argc, argv, optstr);
190 else if (rest_of_args == (WORD_LIST *)NULL)
192 for (i = 0; i < 10 && dollar_vars[i]; i++)
195 sh_getopt_restore_state (dollar_vars);
196 ret = sh_getopt (i, dollar_vars, optstr);
200 register WORD_LIST *words;
203 for (i = 0; i < 10 && dollar_vars[i]; i++)
205 for (words = rest_of_args; words; words = words->next, i++)
207 v = strvec_create (i + 1);
208 for (i = 0; i < 10 && dollar_vars[i]; i++)
209 v[i] = dollar_vars[i];
210 for (words = rest_of_args; words; words = words->next, i++)
211 v[i] = words->word->word;
213 sh_getopt_restore_state (v);
214 ret = sh_getopt (i, v, optstr);
219 sh_opterr = old_opterr;
221 /* Set the OPTIND variable in any case, to handle "--" skipping. It's
222 highly unlikely that 14 digits will be too few. */
225 numval[14] = sh_optind + '0';
231 numval[i = 15] = '\0';
235 numval[--i] = (n % 10) + '0';
239 bind_variable ("OPTIND", numval + i, 0);
241 /* If an error occurred, decide which one it is and set the return
242 code appropriately. In all cases, the option character in error
243 is in OPTOPT. If an invalid option was encountered, OPTARG is
244 NULL. If a required option argument was missing, OPTARG points
245 to a NULL string (that is, sh_optarg[0] == 0). */
248 if (sh_optarg == NULL)
250 else if (sh_optarg[0] == '\0')
256 unbind_variable ("OPTARG");
257 getopts_bind_variable (name, "?");
258 return (EXECUTION_FAILURE);
261 if (ret == G_INVALID_OPT)
263 /* Invalid option encountered. */
264 ret = getopts_bind_variable (name, "?");
268 strval[0] = (char)sh_optopt;
270 bind_variable ("OPTARG", strval, 0);
273 unbind_variable ("OPTARG");
278 if (ret == G_ARG_MISSING)
280 /* Required argument missing. */
283 ret = getopts_bind_variable (name, ":");
285 strval[0] = (char)sh_optopt;
287 bind_variable ("OPTARG", strval, 0);
291 ret = getopts_bind_variable (name, "?");
292 unbind_variable ("OPTARG");
297 bind_variable ("OPTARG", sh_optarg, 0);
299 strval[0] = (char) ret;
301 return (getopts_bind_variable (name, strval));
304 /* The getopts builtin. Build an argv, and call dogetopts with it. */
306 getopts_builtin (list)
318 reset_internal_getopt ();
319 if (internal_getopt (list, "") != -1)
326 av = make_builtin_argv (list, &ac);
327 ret = dogetopts (ac, av);