1 /* argmatch.c -- find a match for a string in an array
3 Copyright (C) 1990, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4 2009, 2010 Free Software Foundation, Inc.
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
66 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
67 Default to __argmatch_die, but allow caller to change this at run-time. */
68 argmatch_exit_fn argmatch_die = __argmatch_die;
71 /* If ARG is an unambiguous match for an element of the
72 NULL-terminated array ARGLIST, return the index in ARGLIST
73 of the matched element, else -1 if it does not match any element
74 or -2 if it is ambiguous (is a prefix of more than one element).
76 If VALLIST is none null, use it to resolve ambiguities limited to
80 "y" is a valid argument, for `0', and "n" for `1'. */
83 argmatch (const char *arg, const char *const *arglist,
84 const char *vallist, size_t valsize)
86 size_t i; /* Temporary index in ARGLIST. */
87 size_t arglen; /* Length of ARG. */
88 ptrdiff_t matchind = -1; /* Index of first nonexact match. */
89 bool ambiguous = false; /* If true, multiple nonexact match(es). */
91 arglen = strlen (arg);
93 /* Test all elements for either exact match or abbreviated matches. */
94 for (i = 0; arglist[i]; i++)
96 if (!strncmp (arglist[i], arg, arglen))
98 if (strlen (arglist[i]) == arglen)
99 /* Exact match found. */
101 else if (matchind == -1)
102 /* First nonexact match found. */
106 /* Second nonexact match found. */
108 || memcmp (vallist + valsize * matchind,
109 vallist + valsize * i, valsize))
111 /* There is a real ambiguity, or we could not
124 /* Error reporting for argmatch.
125 CONTEXT is a description of the type of entity that was being matched.
126 VALUE is the invalid value that was given.
127 PROBLEM is the return value from argmatch. */
130 argmatch_invalid (const char *context, const char *value, ptrdiff_t problem)
132 char const *format = (problem == -1
133 ? _("invalid argument %s for %s")
134 : _("ambiguous argument %s for %s"));
136 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
137 quote_n (1, context));
140 /* List the valid arguments for argmatch.
141 ARGLIST is the same as in argmatch.
142 VALLIST is a pointer to an array of values.
143 VALSIZE is the size of the elements of VALLIST */
145 argmatch_valid (const char *const *arglist,
146 const char *vallist, size_t valsize)
149 const char *last_val = NULL;
151 /* We try to put synonyms on the same line. The assumption is that
152 synonyms follow each other */
153 fprintf (stderr, _("Valid arguments are:"));
154 for (i = 0; arglist[i]; i++)
156 || memcmp (last_val, vallist + valsize * i, valsize))
158 fprintf (stderr, "\n - `%s'", arglist[i]);
159 last_val = vallist + valsize * i;
163 fprintf (stderr, ", `%s'", arglist[i]);
168 /* Never failing versions of the previous functions.
170 CONTEXT is the context for which argmatch is called (e.g.,
171 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
172 calls the (supposed never to return) function EXIT_FN. */
175 __xargmatch_internal (const char *context,
176 const char *arg, const char *const *arglist,
177 const char *vallist, size_t valsize,
178 argmatch_exit_fn exit_fn)
180 ptrdiff_t res = argmatch (arg, arglist, vallist, valsize);
185 /* We failed. Explain why. */
186 argmatch_invalid (context, arg, res);
187 argmatch_valid (arglist, vallist, valsize);
190 return -1; /* To please the compilers. */
193 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
194 return the first corresponding argument in ARGLIST */
196 argmatch_to_argument (const char *value,
197 const char *const *arglist,
198 const char *vallist, size_t valsize)
202 for (i = 0; arglist[i]; i++)
203 if (!memcmp (value, vallist + valsize * i, valsize))
210 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
214 /* When to make backup files. */
217 /* Never make backups. */
220 /* Make simple backups of every file. */
223 /* Make numbered backups of files that already have numbered backups,
224 and simple backups of the others. */
225 numbered_existing_backups,
227 /* Make numbered backups of every file. */
231 /* Two tables describing arguments (keys) and their corresponding
233 static const char *const backup_args[] =
242 static const enum backup_type backup_vals[] =
244 no_backups, no_backups, no_backups,
245 simple_backups, simple_backups,
246 numbered_existing_backups, numbered_existing_backups,
247 numbered_backups, numbered_backups
251 main (int argc, const char *const *argv)
254 enum backup_type backup_type = no_backups;
256 program_name = (char *) argv[0];
260 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
264 if ((cp = getenv ("VERSION_CONTROL")))
265 backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
266 backup_args, backup_vals);
269 backup_type = XARGMATCH (program_name, argv[1],
270 backup_args, backup_vals);
272 printf ("The version control is `%s'\n",
273 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));