| 6e403221 |
1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: wildcard.c,v 1.1 2001/02/04 17:14:42 mdw Exp $ |
| 4 | * |
| 5 | * Matches wildcard patterns |
| 6 | * |
| 7 | * (c) 2001 Mark Wooding |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Anag: a simple wordgame helper. |
| 13 | * |
| 14 | * Anag is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * Anag is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with Anag; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: wildcard.c,v $ |
| 32 | * Revision 1.1 2001/02/04 17:14:42 mdw |
| 33 | * Initial checkin |
| 34 | * |
| 35 | */ |
| 36 | |
| 37 | /*----- Header files ------------------------------------------------------*/ |
| 38 | |
| 39 | #include "anag.h" |
| 40 | |
| 41 | /*----- Data structures ---------------------------------------------------*/ |
| 42 | |
| 43 | typedef struct node_wild { |
| 44 | node n; |
| 45 | const char *p; |
| 46 | } node_wild; |
| 47 | |
| 48 | /*----- Main code ---------------------------------------------------------*/ |
| 49 | |
| 50 | /* --- @match@ --- * |
| 51 | * |
| 52 | * Arguments: @const char *p@ = pointer to pattern string |
| 53 | * @const char *s@ = string to compare with |
| 54 | * |
| 55 | * Returns: Nonzero if the pattern matches the string. |
| 56 | * |
| 57 | * Use: Does simple wildcard matching. This is quite nasty and more |
| 58 | * than a little slow. Supports metacharacters `*', `?' and |
| 59 | * '['. |
| 60 | */ |
| 61 | |
| 62 | static int match(const char *p, const char *s) |
| 63 | { |
| 64 | for (;;) { |
| 65 | char pch = *p++, pche, sch; |
| 66 | int sense; |
| 67 | |
| 68 | switch (pch) { |
| 69 | case '?': |
| 70 | if (!*s) |
| 71 | return (0); |
| 72 | s++; |
| 73 | break; |
| 74 | case '*': |
| 75 | if (!*p) |
| 76 | return (1); |
| 77 | while (*s) { |
| 78 | if (match(p, s)) |
| 79 | return (1); |
| 80 | s++; |
| 81 | } |
| 82 | return (0); |
| 83 | case '[': |
| 84 | if (!*s) |
| 85 | return (0); |
| 86 | sch = *s++; |
| 87 | pch = *p++; |
| 88 | sense = 1; |
| 89 | if (pch == '^' || pch == '!') { |
| 90 | sense = !sense; |
| 91 | pch = *p++; |
| 92 | } |
| 93 | if (pch == ']') { |
| 94 | if (*p == '-' && p[1] && p[1] != ']') { |
| 95 | pche = p[1]; |
| 96 | p += 2; |
| 97 | if (pch <= sch && sch <= pche) |
| 98 | goto class_match; |
| 99 | } else if (pch == sch) |
| 100 | goto class_match; |
| 101 | pch = *p++; |
| 102 | } |
| 103 | for (;; pch = *p++) { |
| 104 | if (!pch || pch == ']') |
| 105 | goto class_nomatch; |
| 106 | if (*p == '-' && p[1] && p[1] != ']') { |
| 107 | pche = p[1]; |
| 108 | p += 2; |
| 109 | if (pch <= sch && sch <= pche) |
| 110 | goto class_match; |
| 111 | } else if (pch == sch) |
| 112 | goto class_match; |
| 113 | } |
| 114 | class_match: |
| 115 | if (!sense) |
| 116 | return (0); |
| 117 | for (;;) { |
| 118 | pch = *p++; |
| 119 | if (!pch) |
| 120 | return (0); |
| 121 | if (pch == ']') |
| 122 | break; |
| 123 | if (*p == '-' && p[1] && p[1] != ']') |
| 124 | p += 2; |
| 125 | } |
| 126 | break; |
| 127 | class_nomatch: |
| 128 | if (sense) |
| 129 | return (0); |
| 130 | break; |
| 131 | case '\\': |
| 132 | pch = *p++; |
| 133 | default: |
| 134 | if (pch != *s) |
| 135 | return (0); |
| 136 | if (!pch) |
| 137 | return (1); |
| 138 | s++; |
| 139 | break; |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /* --- Node matcher --- */ |
| 145 | |
| 146 | static int n_wild(node *nn, const char *p, size_t sz) |
| 147 | { |
| 148 | node_wild *n = (node_wild *)nn; |
| 149 | return (match(n->p, p)); |
| 150 | } |
| 151 | |
| 152 | /* --- Node creation --- */ |
| 153 | |
| 154 | node *wildcard(const char *const *av) |
| 155 | { |
| 156 | node_wild *n = xmalloc(sizeof(*n)); |
| 157 | n->n.func = n_wild; |
| 158 | n->p = av[0]; |
| 159 | return (&n->n); |
| 160 | } |
| 161 | |
| 162 | /*----- That's all, folks -------------------------------------------------*/ |
~mdw / anag / blame