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)
42 #include "unlocked-io.h"
44 /* When reporting an invalid argument, show nonprinting characters
45 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
46 literal_quoting_style. */
47 #ifndef ARGMATCH_QUOTING_STYLE
48 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
51 /* The following test is to work around the gross typo in
52 systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
53 is defined to 0, not 1. */
56 # define EXIT_FAILURE 1
59 /* Non failing version of argmatch call this function after failing. */
61 # define ARGMATCH_DIE exit (EXIT_FAILURE)
64 #ifdef ARGMATCH_DIE_DECL
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).
83 If SENSITIVE, comparison is case sensitive.
85 If VALLIST is none null, use it to resolve ambiguities limited to
89 "y" is a valid argument, for `0', and "n" for `1'. */
92 __argmatch_internal (const char *arg, const char *const *arglist,
93 const char *vallist, size_t valsize,
96 int i; /* Temporary index in ARGLIST. */
97 size_t arglen; /* Length of ARG. */
98 int matchind = -1; /* Index of first nonexact match. */
99 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
101 arglen = strlen (arg);
103 /* Test all elements for either exact match or abbreviated matches. */
104 for (i = 0; arglist[i]; i++)
107 ? !strncmp (arglist[i], arg, arglen)
108 : !strncasecmp (arglist[i], arg, arglen))
110 if (strlen (arglist[i]) == arglen)
111 /* Exact match found. */
113 else if (matchind == -1)
114 /* First nonexact match found. */
118 /* Second nonexact match found. */
120 || memcmp (vallist + valsize * matchind,
121 vallist + valsize * i, valsize))
123 /* There is a real ambiguity, or we could not
136 /* argmatch - case sensitive version */
138 argmatch (const char *arg, const char *const *arglist,
139 const char *vallist, size_t valsize)
141 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
144 /* argcasematch - case insensitive version */
146 argcasematch (const char *arg, const char *const *arglist,
147 const char *vallist, size_t valsize)
149 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
152 /* Error reporting for argmatch.
153 CONTEXT is a description of the type of entity that was being matched.
154 VALUE is the invalid value that was given.
155 PROBLEM is the return value from argmatch. */
158 argmatch_invalid (const char *context, const char *value, int problem)
160 char const *format = (problem == -1
161 ? _("invalid argument %s for %s")
162 : _("ambiguous argument %s for %s"));
164 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
165 quote_n (1, context));
168 /* List the valid arguments for argmatch.
169 ARGLIST is the same as in argmatch.
170 VALLIST is a pointer to an array of values.
171 VALSIZE is the size of the elements of VALLIST */
173 argmatch_valid (const char *const *arglist,
174 const char *vallist, size_t valsize)
177 const char *last_val = NULL;
179 /* We try to put synonyms on the same line. The assumption is that
180 synonyms follow each other */
181 fprintf (stderr, _("Valid arguments are:"));
182 for (i = 0; arglist[i]; i++)
184 || memcmp (last_val, vallist + valsize * i, valsize))
186 fprintf (stderr, "\n - `%s'", arglist[i]);
187 last_val = vallist + valsize * i;
191 fprintf (stderr, ", `%s'", arglist[i]);
196 /* Never failing versions of the previous functions.
198 CONTEXT is the context for which argmatch is called (e.g.,
199 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
200 calls the (supposed never to return) function EXIT_FN. */
203 __xargmatch_internal (const char *context,
204 const char *arg, const char *const *arglist,
205 const char *vallist, size_t valsize,
207 argmatch_exit_fn exit_fn)
209 int res = __argmatch_internal (arg, arglist,
216 /* We failed. Explain why. */
217 argmatch_invalid (context, arg, res);
218 argmatch_valid (arglist, vallist, valsize);
221 return -1; /* To please the compilers. */
224 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
225 return the first corresponding argument in ARGLIST */
227 argmatch_to_argument (const char *value,
228 const char *const *arglist,
229 const char *vallist, size_t valsize)
233 for (i = 0; arglist[i]; i++)
234 if (!memcmp (value, vallist + valsize * i, valsize))
241 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
244 extern const char *getenv ();
246 /* When to make backup files. */
249 /* Never make backups. */
252 /* Make simple backups of every file. */
255 /* Make numbered backups of files that already have numbered backups,
256 and simple backups of the others. */
259 /* Make numbered backups of every file. */
263 /* Two tables describing arguments (keys) and their corresponding
265 static const char *const backup_args[] =
274 static const enum backup_type backup_vals[] =
278 numbered_existing, numbered_existing,
283 main (int argc, const char *const *argv)
286 enum backup_type backup_type = none;
288 program_name = (char *) argv[0];
292 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
296 if ((cp = getenv ("VERSION_CONTROL")))
297 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
298 backup_args, backup_vals);
301 backup_type = XARGCASEMATCH (program_name, argv[1],
302 backup_args, backup_vals);
304 printf ("The version control is `%s'\n",
305 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));