1 /* argmatch.c -- find a match for a string in an array
3 Copyright (C) 1990, 1998-1999, 2001-2007, 2009-2011 Free Software
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by David MacKenzie <djm@ai.mit.edu>
20 Modified by Akim Demaille <demaille@inf.enst.fr> */
33 #define _(msgid) gettext (msgid)
40 # include "unlocked-io.h"
43 /* When reporting an invalid argument, show nonprinting characters
44 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
45 literal_quoting_style. */
46 #ifndef ARGMATCH_QUOTING_STYLE
47 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
50 /* Non failing version of argmatch call this function after failing. */
52 # include "exitfail.h"
53 # define ARGMATCH_DIE exit (exit_failure)
56 #ifdef ARGMATCH_DIE_DECL
60 /* The attribute __pure__ was added in gcc 2.96. */
61 #undef _GL_ATTRIBUTE_PURE
62 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
63 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
65 # define _GL_ATTRIBUTE_PURE /* empty */
74 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
75 Default to __argmatch_die, but allow caller to change this at run-time. */
76 argmatch_exit_fn argmatch_die = __argmatch_die;
79 /* If ARG is an unambiguous match for an element of the
80 NULL-terminated array ARGLIST, return the index in ARGLIST
81 of the matched element, else -1 if it does not match any element
82 or -2 if it is ambiguous (is a prefix of more than one element).
84 If VALLIST is none null, use it to resolve ambiguities limited to
88 "y" is a valid argument, for `0', and "n" for `1'. */
90 ptrdiff_t _GL_ATTRIBUTE_PURE
91 argmatch (const char *arg, const char *const *arglist,
92 const char *vallist, size_t valsize)
94 size_t i; /* Temporary index in ARGLIST. */
95 size_t arglen; /* Length of ARG. */
96 ptrdiff_t matchind = -1; /* Index of first nonexact match. */
97 bool ambiguous = false; /* If true, multiple nonexact match(es). */
99 arglen = strlen (arg);
101 /* Test all elements for either exact match or abbreviated matches. */
102 for (i = 0; arglist[i]; i++)
104 if (!strncmp (arglist[i], arg, arglen))
106 if (strlen (arglist[i]) == arglen)
107 /* Exact match found. */
109 else if (matchind == -1)
110 /* First nonexact match found. */
114 /* Second nonexact match found. */
116 || memcmp (vallist + valsize * matchind,
117 vallist + valsize * i, valsize))
119 /* There is a real ambiguity, or we could not
132 /* Error reporting for argmatch.
133 CONTEXT is a description of the type of entity that was being matched.
134 VALUE is the invalid value that was given.
135 PROBLEM is the return value from argmatch. */
138 argmatch_invalid (const char *context, const char *value, ptrdiff_t problem)
140 char const *format = (problem == -1
141 ? _("invalid argument %s for %s")
142 : _("ambiguous argument %s for %s"));
144 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
145 quote_n (1, context));
148 /* List the valid arguments for argmatch.
149 ARGLIST is the same as in argmatch.
150 VALLIST is a pointer to an array of values.
151 VALSIZE is the size of the elements of VALLIST */
153 argmatch_valid (const char *const *arglist,
154 const char *vallist, size_t valsize)
157 const char *last_val = NULL;
159 /* We try to put synonyms on the same line. The assumption is that
160 synonyms follow each other */
161 fprintf (stderr, _("Valid arguments are:"));
162 for (i = 0; arglist[i]; i++)
164 || memcmp (last_val, vallist + valsize * i, valsize))
166 fprintf (stderr, "\n - `%s'", arglist[i]);
167 last_val = vallist + valsize * i;
171 fprintf (stderr, ", `%s'", arglist[i]);
176 /* Never failing versions of the previous functions.
178 CONTEXT is the context for which argmatch is called (e.g.,
179 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
180 calls the (supposed never to return) function EXIT_FN. */
183 __xargmatch_internal (const char *context,
184 const char *arg, const char *const *arglist,
185 const char *vallist, size_t valsize,
186 argmatch_exit_fn exit_fn)
188 ptrdiff_t res = argmatch (arg, arglist, vallist, valsize);
193 /* We failed. Explain why. */
194 argmatch_invalid (context, arg, res);
195 argmatch_valid (arglist, vallist, valsize);
198 return -1; /* To please the compilers. */
201 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
202 return the first corresponding argument in ARGLIST */
204 argmatch_to_argument (const char *value,
205 const char *const *arglist,
206 const char *vallist, size_t valsize)
210 for (i = 0; arglist[i]; i++)
211 if (!memcmp (value, vallist + valsize * i, valsize))
218 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
222 /* When to make backup files. */
225 /* Never make backups. */
228 /* Make simple backups of every file. */
231 /* Make numbered backups of files that already have numbered backups,
232 and simple backups of the others. */
233 numbered_existing_backups,
235 /* Make numbered backups of every file. */
239 /* Two tables describing arguments (keys) and their corresponding
241 static const char *const backup_args[] =
250 static const enum backup_type backup_vals[] =
252 no_backups, no_backups, no_backups,
253 simple_backups, simple_backups,
254 numbered_existing_backups, numbered_existing_backups,
255 numbered_backups, numbered_backups
259 main (int argc, const char *const *argv)
262 enum backup_type backup_type = no_backups;
264 program_name = (char *) argv[0];
268 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
272 if ((cp = getenv ("VERSION_CONTROL")))
273 backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
274 backup_args, backup_vals);
277 backup_type = XARGMATCH (program_name, argv[1],
278 backup_args, backup_vals);
280 printf ("The version control is `%s'\n",
281 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));