1 /* argmatch.c -- find a match for a string in an array
2 Copyright (C) 1990, 1998, 1999, 2001 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> */
34 # define _(Text) gettext (Text)
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 /* The following test is to work around the gross typo in
51 systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
52 is defined to 0, not 1. */
55 # define EXIT_FAILURE 1
58 /* Non failing version of argmatch call this function after failing. */
60 # define ARGMATCH_DIE exit (EXIT_FAILURE)
63 #ifdef ARGMATCH_DIE_DECL
73 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
74 Default to __argmatch_die, but allow caller to change this at run-time. */
75 argmatch_exit_fn argmatch_die = __argmatch_die;
78 /* If ARG is an unambiguous match for an element of the
79 null-terminated array ARGLIST, return the index in ARGLIST
80 of the matched element, else -1 if it does not match any element
81 or -2 if it is ambiguous (is a prefix of more than one element).
82 If SENSITIVE, comparison is case sensitive.
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'. */
91 __argmatch_internal (const char *arg, const char *const *arglist,
92 const char *vallist, size_t valsize,
95 int i; /* Temporary index in ARGLIST. */
96 size_t arglen; /* Length of ARG. */
97 int matchind = -1; /* Index of first nonexact match. */
98 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
100 arglen = strlen (arg);
102 /* Test all elements for either exact match or abbreviated matches. */
103 for (i = 0; arglist[i]; i++)
106 ? !strncmp (arglist[i], arg, arglen)
107 : !strncasecmp (arglist[i], arg, arglen))
109 if (strlen (arglist[i]) == arglen)
110 /* Exact match found. */
112 else if (matchind == -1)
113 /* First nonexact match found. */
117 /* Second nonexact match found. */
119 || memcmp (vallist + valsize * matchind,
120 vallist + valsize * i, valsize))
122 /* There is a real ambiguity, or we could not
135 /* argmatch - case sensitive version */
137 argmatch (const char *arg, const char *const *arglist,
138 const char *vallist, size_t valsize)
140 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
143 /* argcasematch - case insensitive version */
145 argcasematch (const char *arg, const char *const *arglist,
146 const char *vallist, size_t valsize)
148 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
151 /* Error reporting for argmatch.
152 CONTEXT is a description of the type of entity that was being matched.
153 VALUE is the invalid value that was given.
154 PROBLEM is the return value from argmatch. */
157 argmatch_invalid (const char *context, const char *value, int problem)
159 char const *format = (problem == -1
160 ? _("invalid argument %s for %s")
161 : _("ambiguous argument %s for %s"));
163 error (0, 0, format, quotearg_style (ARGMATCH_QUOTING_STYLE, value),
167 /* List the valid arguments for argmatch.
168 ARGLIST is the same as in argmatch.
169 VALLIST is a pointer to an array of values.
170 VALSIZE is the size of the elements of VALLIST */
172 argmatch_valid (const char *const *arglist,
173 const char *vallist, size_t valsize)
176 const char *last_val = NULL;
178 /* We try to put synonyms on the same line. The assumption is that
179 synonyms follow each other */
180 fprintf (stderr, _("Valid arguments are:"));
181 for (i = 0; arglist[i]; i++)
183 || memcmp (last_val, vallist + valsize * i, valsize))
185 fprintf (stderr, "\n - `%s'", arglist[i]);
186 last_val = vallist + valsize * i;
190 fprintf (stderr, ", `%s'", arglist[i]);
195 /* Never failing versions of the previous functions.
197 CONTEXT is the context for which argmatch is called (e.g.,
198 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
199 calls the (supposed never to return) function EXIT_FN. */
202 __xargmatch_internal (const char *context,
203 const char *arg, const char *const *arglist,
204 const char *vallist, size_t valsize,
206 argmatch_exit_fn exit_fn)
208 int res = __argmatch_internal (arg, arglist,
215 /* We failed. Explain why. */
216 argmatch_invalid (context, arg, res);
217 argmatch_valid (arglist, vallist, valsize);
220 return -1; /* To please the compilers. */
223 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
224 return the first corresponding argument in ARGLIST */
226 argmatch_to_argument (const char *value,
227 const char *const *arglist,
228 const char *vallist, size_t valsize)
232 for (i = 0; arglist[i]; i++)
233 if (!memcmp (value, vallist + valsize * i, valsize))
240 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
243 extern const char *getenv ();
245 /* When to make backup files. */
248 /* Never make backups. */
251 /* Make simple backups of every file. */
254 /* Make numbered backups of files that already have numbered backups,
255 and simple backups of the others. */
258 /* Make numbered backups of every file. */
262 /* Two tables describing arguments (keys) and their corresponding
264 static const char *const backup_args[] =
273 static const enum backup_type backup_vals[] =
277 numbered_existing, numbered_existing,
282 main (int argc, const char *const *argv)
285 enum backup_type backup_type = none;
287 program_name = (char *) argv[0];
291 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
295 if ((cp = getenv ("VERSION_CONTROL")))
296 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
297 backup_args, backup_vals);
300 backup_type = XARGCASEMATCH (program_name, argv[1],
301 backup_args, backup_vals);
303 printf ("The version control is `%s'\n",
304 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));