1 /* argmatch.c -- find a match for a string in an array 2 Copyright (C) 1990, 1997 Free Software Foundation, Inc. 3 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) 7 any later version. 8 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. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; see the file COPYING. 16 If not, write to the Free Software Foundation, 17 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 18 19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> */ 20 21 #if HAVE_CONFIG_H 22 # include <config.h> 23 #endif 24 25 #include <argmatch.h> 26 27 #include <sys/types.h> 28 29 #include <stdio.h> 30 #if HAVE_STRING_H 31 # include <string.h> 32 #else 33 # include <strings.h> 34 #endif 35 36 /* If ARG is an unambiguous match for an element of the 37 null-terminated array OPTLIST, return the index in OPTLIST 38 of the matched element, else -1 if it does not match any element 39 or -2 if it is ambiguous (is a prefix of more than one element). */ 40 41 int 42 argmatch (arg, optlist) 43 const char *arg; 44 const char *const *optlist; 45 { 46 int i; /* Temporary index in OPTLIST. */ 47 size_t arglen; /* Length of ARG. */ 48 int matchind = -1; /* Index of first nonexact match. */ 49 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */ 50 51 arglen = strlen (arg); 52 53 /* Test all elements for either exact match or abbreviated matches. */ 54 for (i = 0; optlist[i]; i++) 55 { 56 if (!strncmp (optlist[i], arg, arglen)) 57 { 58 if (strlen (optlist[i]) == arglen) 59 /* Exact match found. */ 60 return i; 61 else if (matchind == -1) 62 /* First nonexact match found. */ 63 matchind = i; 64 else 65 /* Second nonexact match found. */ 66 ambiguous = 1; 67 } 68 } 69 if (ambiguous) 70 return -2; 71 else 72 return matchind; 73 } 74 75 /* Error reporting for argmatch. 76 KIND is a description of the type of entity that was being matched. 77 VALUE is the invalid value that was given. 78 PROBLEM is the return value from argmatch. */ 79 80 void 81 invalid_arg (kind, value, problem) 82 const char *kind; 83 const char *value; 84 int problem; 85 { 86 fprintf (stderr, "%s: ", program_name); 87 if (problem == -1) 88 fprintf (stderr, "invalid"); 89 else /* Assume -2. */ 90 fprintf (stderr, "ambiguous"); 91 fprintf (stderr, " %s `%s'\n", kind, value); 92 } 93