From: Paul Eggert Date: Mon, 25 Jan 1999 14:09:30 +0000 (+0000) Subject: GNU fileutils 4.0i X-Git-Url: https://git.brokenzipper.com/gitweb?a=commitdiff_plain;h=d434121129037355261deae143cb05cabd370cb4;p=chaz%2Ftar GNU fileutils 4.0i --- diff --git a/lib/argmatch.c b/lib/argmatch.c new file mode 100644 index 0000000..f08fba3 --- /dev/null +++ b/lib/argmatch.c @@ -0,0 +1,316 @@ +/* argmatch.c -- find a match for a string in an array + Copyright (C) 1990, 1998, 1999 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by David MacKenzie + Modified by Akim Demaille */ + +#include "argmatch.h" + +#include +#ifdef STDC_HEADERS +# include +#endif + +#if HAVE_LOCALE_H +# include +#endif + +#if ENABLE_NLS +# include +# define _(Text) gettext (Text) +#else +# define _(Text) Text +#endif + +#include "error.h" +#include "quotearg.h" + +/* When reporting an invalid argument, show nonprinting characters + by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use + literal_quoting_style. */ +#ifndef ARGMATCH_QUOTING_STYLE +# define ARGMATCH_QUOTING_STYLE escape_quoting_style +#endif + +/* The following test is to work around the gross typo in + systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE + is defined to 0, not 1. */ +#if !EXIT_FAILURE +# undef EXIT_FAILURE +# define EXIT_FAILURE 1 +#endif + +/* Non failing version of argmatch call this function after failing. */ +#ifndef ARGMATCH_DIE +# define ARGMATCH_DIE exit (EXIT_FAILURE) +#endif + +#ifdef ARGMATCH_DIE_DECL +ARGMATCH_DIE_DECL; +#endif + +static void +__argmatch_die (void) +{ + ARGMATCH_DIE; +} + +/* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h. + Default to __argmatch_die, but allow caller to change this at run-time. */ +argmatch_exit_fn argmatch_die = __argmatch_die; + + +/* If ARG is an unambiguous match for an element of the + null-terminated array ARGLIST, return the index in ARGLIST + of the matched element, else -1 if it does not match any element + or -2 if it is ambiguous (is a prefix of more than one element). + If SENSITIVE, comparison is case sensitive. + + If VALLIST is none null, use it to resolve ambiguities limited to + synonyms, i.e., for + "yes", "yop" -> 0 + "no", "nope" -> 1 + "y" is a valid argument, for `0', and "n" for `1'. */ + +static int +__argmatch_internal (const char *arg, const char *const *arglist, + const char *vallist, size_t valsize, + int case_sensitive) +{ + int i; /* Temporary index in ARGLIST. */ + size_t arglen; /* Length of ARG. */ + int matchind = -1; /* Index of first nonexact match. */ + int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */ + + arglen = strlen (arg); + + /* Test all elements for either exact match or abbreviated matches. */ + for (i = 0; arglist[i]; i++) + { + if (case_sensitive + ? !strncmp (arglist[i], arg, arglen) + : !strncasecmp (arglist[i], arg, arglen)) + { + if (strlen (arglist[i]) == arglen) + /* Exact match found. */ + return i; + else if (matchind == -1) + /* First nonexact match found. */ + matchind = i; + else + { + /* Second nonexact match found. */ + if (vallist == NULL + || memcmp (vallist + valsize * matchind, + vallist + valsize * i, valsize)) + { + /* There is a real ambiguity, or we could not + disambiguate. */ + ambiguous = 1; + } + } + } + } + if (ambiguous) + return -2; + else + return matchind; +} + +/* argmatch - case sensitive version */ +int +argmatch (const char *arg, const char *const *arglist, + const char *vallist, size_t valsize) +{ + return __argmatch_internal (arg, arglist, vallist, valsize, 1); +} + +/* argcasematch - case insensitive version */ +int +argcasematch (const char *arg, const char *const *arglist, + const char *vallist, size_t valsize) +{ + return __argmatch_internal (arg, arglist, vallist, valsize, 0); +} + +/* Error reporting for argmatch. + CONTEXT is a description of the type of entity that was being matched. + VALUE is the invalid value that was given. + PROBLEM is the return value from argmatch. */ + +void +argmatch_invalid (const char *context, const char *value, int problem) +{ + enum quoting_style saved_quoting_style; + char const *format; + + /* Make sure to have a good quoting style to report errors. + literal is insane here. */ + saved_quoting_style = get_quoting_style (NULL); + set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE); + + format = (problem == -1 + ? _("invalid argument `%s' for `%s'") + : _("ambiguous argument `%s' for `%s'")); + + error (0, 0, format, quotearg (value), context); + + set_quoting_style (NULL, saved_quoting_style); +} + +/* List the valid arguments for argmatch. + ARGLIST is the same as in argmatch. + VALLIST is a pointer to an array of values. + VALSIZE is the size of the elements of VALLIST */ +void +argmatch_valid (const char *const *arglist, + const char *vallist, size_t valsize) +{ + int i; + const char *last_val = NULL; + + /* We try to put synonyms on the same line. The assumption is that + synonyms follow each other */ + fprintf (stderr, _("Valid arguments are:")); + for (i = 0; arglist[i]; i++) + if ((i == 0) + || memcmp (last_val, vallist + valsize * i, valsize)) + { + fprintf (stderr, "\n - `%s'", arglist[i]); + last_val = vallist + valsize * i; + } + else + { + fprintf (stderr, ", `%s'", arglist[i]); + } + putc ('\n', stderr); +} + +/* Never failing versions of the previous functions. + + CONTEXT is the context for which argmatch is called (e.g., + "--version-control", or "$VERSION_CONTROL" etc.). Upon failure, + calls the (supposed never to return) function EXIT_FN. */ + +int +__xargmatch_internal (const char *context, + const char *arg, const char *const *arglist, + const char *vallist, size_t valsize, + int case_sensitive, + argmatch_exit_fn exit_fn) +{ + int res = __argmatch_internal (arg, arglist, + vallist, valsize, + case_sensitive); + if (res >= 0) + /* Success. */ + return res; + + /* We failed. Explain why. */ + argmatch_invalid (context, arg, res); + argmatch_valid (arglist, vallist, valsize); + (*exit_fn) (); + + return -1; /* To please the compilers. */ +} + +/* Look for VALUE in VALLIST, an array of objects of size VALSIZE and + return the first corresponding argument in ARGLIST */ +const char * +argmatch_to_argument (const char *value, + const char *const *arglist, + const char *vallist, size_t valsize) +{ + int i; + + for (i = 0; arglist[i]; i++) + if (!memcmp (value, vallist + valsize * i, valsize)) + return arglist[i]; + return NULL; +} + +#ifdef TEST +/* + * Based on "getversion.c" by David MacKenzie + */ +char *program_name; +extern const char *getenv (); + +/* When to make backup files. */ +enum backup_type +{ + /* Never make backups. */ + none, + + /* Make simple backups of every file. */ + simple, + + /* Make numbered backups of files that already have numbered backups, + and simple backups of the others. */ + numbered_existing, + + /* Make numbered backups of every file. */ + numbered +}; + +/* Two tables describing arguments (keys) and their corresponding + values */ +static const char *const backup_args[] = +{ + "no", "none", "off", + "simple", "never", + "existing", "nil", + "numbered", "t", + 0 +}; + +static const enum backup_type backup_vals[] = +{ + none, none, none, + simple, simple, + numbered_existing, numbered_existing, + numbered, numbered +}; + +int +main (int argc, const char *const *argv) +{ + const char *cp; + enum backup_type backup_type = none; + + program_name = (char *) argv[0]; + + if (argc > 2) + { + fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name); + exit (1); + } + + if ((cp = getenv ("VERSION_CONTROL"))) + backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp, + backup_args, backup_vals); + + if (argc == 2) + backup_type = XARGCASEMATCH (program_name, argv[1], + backup_args, backup_vals); + + printf ("The version control is `%s'\n", + ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals)); + + return 0; +} +#endif