1 /* argmatch.c -- find a match for a string in an array
2 Copyright (C) 1990, 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by David MacKenzie <djm@ai.mit.edu>
19 Modified by Akim Demaille <demaille@inf.enst.fr> */
29 #define _(msgid) gettext (msgid)
34 #include "unlocked-io.h"
36 /* When reporting an invalid argument, show nonprinting characters
37 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
38 literal_quoting_style. */
39 #ifndef ARGMATCH_QUOTING_STYLE
40 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
43 /* The following test is to work around the gross typo in
44 systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
45 is defined to 0, not 1. */
48 # define EXIT_FAILURE 1
51 /* Non failing version of argmatch call this function after failing. */
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).
75 If SENSITIVE, comparison is case sensitive.
77 If VALLIST is none null, use it to resolve ambiguities limited to
81 "y" is a valid argument, for `0', and "n" for `1'. */
84 __argmatch_internal (const char *arg, const char *const *arglist,
85 const char *vallist, size_t valsize,
88 int i; /* Temporary index in ARGLIST. */
89 size_t arglen; /* Length of ARG. */
90 int matchind = -1; /* Index of first nonexact match. */
91 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
93 arglen = strlen (arg);
95 /* Test all elements for either exact match or abbreviated matches. */
96 for (i = 0; arglist[i]; i++)
99 ? !strncmp (arglist[i], arg, arglen)
100 : !strncasecmp (arglist[i], arg, arglen))
102 if (strlen (arglist[i]) == arglen)
103 /* Exact match found. */
105 else if (matchind == -1)
106 /* First nonexact match found. */
110 /* Second nonexact match found. */
112 || memcmp (vallist + valsize * matchind,
113 vallist + valsize * i, valsize))
115 /* There is a real ambiguity, or we could not
128 /* argmatch - case sensitive version */
130 argmatch (const char *arg, const char *const *arglist,
131 const char *vallist, size_t valsize)
133 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
136 /* argcasematch - case insensitive version */
138 argcasematch (const char *arg, const char *const *arglist,
139 const char *vallist, size_t valsize)
141 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
144 /* Error reporting for argmatch.
145 CONTEXT is a description of the type of entity that was being matched.
146 VALUE is the invalid value that was given.
147 PROBLEM is the return value from argmatch. */
150 argmatch_invalid (const char *context, const char *value, int problem)
152 char const *format = (problem == -1
153 ? _("invalid argument %s for %s")
154 : _("ambiguous argument %s for %s"));
156 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
157 quote_n (1, context));
160 /* List the valid arguments for argmatch.
161 ARGLIST is the same as in argmatch.
162 VALLIST is a pointer to an array of values.
163 VALSIZE is the size of the elements of VALLIST */
165 argmatch_valid (const char *const *arglist,
166 const char *vallist, size_t valsize)
169 const char *last_val = NULL;
171 /* We try to put synonyms on the same line. The assumption is that
172 synonyms follow each other */
173 fprintf (stderr, _("Valid arguments are:"));
174 for (i = 0; arglist[i]; i++)
176 || memcmp (last_val, vallist + valsize * i, valsize))
178 fprintf (stderr, "\n - `%s'", arglist[i]);
179 last_val = vallist + valsize * i;
183 fprintf (stderr, ", `%s'", arglist[i]);
188 /* Never failing versions of the previous functions.
190 CONTEXT is the context for which argmatch is called (e.g.,
191 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
192 calls the (supposed never to return) function EXIT_FN. */
195 __xargmatch_internal (const char *context,
196 const char *arg, const char *const *arglist,
197 const char *vallist, size_t valsize,
199 argmatch_exit_fn exit_fn)
201 int res = __argmatch_internal (arg, arglist,
208 /* We failed. Explain why. */
209 argmatch_invalid (context, arg, res);
210 argmatch_valid (arglist, vallist, valsize);
213 return -1; /* To please the compilers. */
216 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
217 return the first corresponding argument in ARGLIST */
219 argmatch_to_argument (const char *value,
220 const char *const *arglist,
221 const char *vallist, size_t valsize)
225 for (i = 0; arglist[i]; i++)
226 if (!memcmp (value, vallist + valsize * i, valsize))
233 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
236 extern const char *getenv ();
238 /* When to make backup files. */
241 /* Never make backups. */
244 /* Make simple backups of every file. */
247 /* Make numbered backups of files that already have numbered backups,
248 and simple backups of the others. */
251 /* Make numbered backups of every file. */
255 /* Two tables describing arguments (keys) and their corresponding
257 static const char *const backup_args[] =
266 static const enum backup_type backup_vals[] =
270 numbered_existing, numbered_existing,
275 main (int argc, const char *const *argv)
278 enum backup_type backup_type = none;
280 program_name = (char *) argv[0];
284 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
288 if ((cp = getenv ("VERSION_CONTROL")))
289 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
290 backup_args, backup_vals);
293 backup_type = XARGCASEMATCH (program_name, argv[1],
294 backup_args, backup_vals);
296 printf ("The version control is `%s'\n",
297 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));