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1 | /* | |
2 | ** Do shell-style pattern matching for ?, \, [], and * characters. | |
3 | ** It is 8bit clean. | |
4 | ** | |
5 | ** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986. | |
6 | ** Rich $alz is now <rsalz@bbn.com>. | |
7 | ** | |
8 | ** Modified by Wayne Davison to special-case '/' matching, to make '**' | |
9 | ** work differently than '*', and to fix the character-class code. | |
10 | */ | |
11 | ||
12 | #include "cache.h" | |
13 | #include "wildmatch.h" | |
14 | ||
15 | typedef unsigned char uchar; | |
16 | ||
17 | /* What character marks an inverted character class? */ | |
18 | #define NEGATE_CLASS '!' | |
19 | #define NEGATE_CLASS2 '^' | |
20 | ||
21 | #define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \ | |
22 | && *(class) == *(litmatch) \ | |
23 | && strncmp((char*)class, litmatch, len) == 0) | |
24 | ||
25 | #if defined STDC_HEADERS || !defined isascii | |
26 | # define ISASCII(c) 1 | |
27 | #else | |
28 | # define ISASCII(c) isascii(c) | |
29 | #endif | |
30 | ||
31 | #ifdef isblank | |
32 | # define ISBLANK(c) (ISASCII(c) && isblank(c)) | |
33 | #else | |
34 | # define ISBLANK(c) ((c) == ' ' || (c) == '\t') | |
35 | #endif | |
36 | ||
37 | #ifdef isgraph | |
38 | # define ISGRAPH(c) (ISASCII(c) && isgraph(c)) | |
39 | #else | |
40 | # define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c)) | |
41 | #endif | |
42 | ||
43 | #define ISPRINT(c) (ISASCII(c) && isprint(c)) | |
44 | #define ISDIGIT(c) (ISASCII(c) && isdigit(c)) | |
45 | #define ISALNUM(c) (ISASCII(c) && isalnum(c)) | |
46 | #define ISALPHA(c) (ISASCII(c) && isalpha(c)) | |
47 | #define ISCNTRL(c) (ISASCII(c) && iscntrl(c)) | |
48 | #define ISLOWER(c) (ISASCII(c) && islower(c)) | |
49 | #define ISPUNCT(c) (ISASCII(c) && ispunct(c)) | |
50 | #define ISSPACE(c) (ISASCII(c) && isspace(c)) | |
51 | #define ISUPPER(c) (ISASCII(c) && isupper(c)) | |
52 | #define ISXDIGIT(c) (ISASCII(c) && isxdigit(c)) | |
53 | ||
54 | /* Match pattern "p" against "text" */ | |
55 | static int dowild(const uchar *p, const uchar *text, unsigned int flags) | |
56 | { | |
57 | uchar p_ch; | |
58 | const uchar *pattern = p; | |
59 | ||
60 | for ( ; (p_ch = *p) != '\0'; text++, p++) { | |
61 | int matched, match_slash, negated; | |
62 | uchar t_ch, prev_ch; | |
63 | if ((t_ch = *text) == '\0' && p_ch != '*') | |
64 | return WM_ABORT_ALL; | |
65 | if ((flags & WM_CASEFOLD) && ISUPPER(t_ch)) | |
66 | t_ch = tolower(t_ch); | |
67 | if ((flags & WM_CASEFOLD) && ISUPPER(p_ch)) | |
68 | p_ch = tolower(p_ch); | |
69 | switch (p_ch) { | |
70 | case '\\': | |
71 | /* Literal match with following character. Note that the test | |
72 | * in "default" handles the p[1] == '\0' failure case. */ | |
73 | p_ch = *++p; | |
74 | /* FALLTHROUGH */ | |
75 | default: | |
76 | if (t_ch != p_ch) | |
77 | return WM_NOMATCH; | |
78 | continue; | |
79 | case '?': | |
80 | /* Match anything but '/'. */ | |
81 | if ((flags & WM_PATHNAME) && t_ch == '/') | |
82 | return WM_NOMATCH; | |
83 | continue; | |
84 | case '*': | |
85 | if (*++p == '*') { | |
86 | const uchar *prev_p = p - 2; | |
87 | while (*++p == '*') {} | |
88 | if (!(flags & WM_PATHNAME)) | |
89 | /* without WM_PATHNAME, '*' == '**' */ | |
90 | match_slash = 1; | |
91 | else if ((prev_p < pattern || *prev_p == '/') && | |
92 | (*p == '\0' || *p == '/' || | |
93 | (p[0] == '\\' && p[1] == '/'))) { | |
94 | /* | |
95 | * Assuming we already match 'foo/' and are at | |
96 | * <star star slash>, just assume it matches | |
97 | * nothing and go ahead match the rest of the | |
98 | * pattern with the remaining string. This | |
99 | * helps make foo/<*><*>/bar (<> because | |
100 | * otherwise it breaks C comment syntax) match | |
101 | * both foo/bar and foo/a/bar. | |
102 | */ | |
103 | if (p[0] == '/' && | |
104 | dowild(p + 1, text, flags) == WM_MATCH) | |
105 | return WM_MATCH; | |
106 | match_slash = 1; | |
107 | } else /* WM_PATHNAME is set */ | |
108 | match_slash = 0; | |
109 | } else | |
110 | /* without WM_PATHNAME, '*' == '**' */ | |
111 | match_slash = flags & WM_PATHNAME ? 0 : 1; | |
112 | if (*p == '\0') { | |
113 | /* Trailing "**" matches everything. Trailing "*" matches | |
114 | * only if there are no more slash characters. */ | |
115 | if (!match_slash) { | |
116 | if (strchr((char*)text, '/') != NULL) | |
117 | return WM_NOMATCH; | |
118 | } | |
119 | return WM_MATCH; | |
120 | } else if (!match_slash && *p == '/') { | |
121 | /* | |
122 | * _one_ asterisk followed by a slash | |
123 | * with WM_PATHNAME matches the next | |
124 | * directory | |
125 | */ | |
126 | const char *slash = strchr((char*)text, '/'); | |
127 | if (!slash) | |
128 | return WM_NOMATCH; | |
129 | text = (const uchar*)slash; | |
130 | /* the slash is consumed by the top-level for loop */ | |
131 | break; | |
132 | } | |
133 | while (1) { | |
134 | if (t_ch == '\0') | |
135 | break; | |
136 | /* | |
137 | * Try to advance faster when an asterisk is | |
138 | * followed by a literal. We know in this case | |
139 | * that the string before the literal | |
140 | * must belong to "*". | |
141 | * If match_slash is false, do not look past | |
142 | * the first slash as it cannot belong to '*'. | |
143 | */ | |
144 | if (!is_glob_special(*p)) { | |
145 | p_ch = *p; | |
146 | if ((flags & WM_CASEFOLD) && ISUPPER(p_ch)) | |
147 | p_ch = tolower(p_ch); | |
148 | while ((t_ch = *text) != '\0' && | |
149 | (match_slash || t_ch != '/')) { | |
150 | if ((flags & WM_CASEFOLD) && ISUPPER(t_ch)) | |
151 | t_ch = tolower(t_ch); | |
152 | if (t_ch == p_ch) | |
153 | break; | |
154 | text++; | |
155 | } | |
156 | if (t_ch != p_ch) | |
157 | return WM_NOMATCH; | |
158 | } | |
159 | if ((matched = dowild(p, text, flags)) != WM_NOMATCH) { | |
160 | if (!match_slash || matched != WM_ABORT_TO_STARSTAR) | |
161 | return matched; | |
162 | } else if (!match_slash && t_ch == '/') | |
163 | return WM_ABORT_TO_STARSTAR; | |
164 | t_ch = *++text; | |
165 | } | |
166 | return WM_ABORT_ALL; | |
167 | case '[': | |
168 | p_ch = *++p; | |
169 | #ifdef NEGATE_CLASS2 | |
170 | if (p_ch == NEGATE_CLASS2) | |
171 | p_ch = NEGATE_CLASS; | |
172 | #endif | |
173 | /* Assign literal 1/0 because of "matched" comparison. */ | |
174 | negated = p_ch == NEGATE_CLASS ? 1 : 0; | |
175 | if (negated) { | |
176 | /* Inverted character class. */ | |
177 | p_ch = *++p; | |
178 | } | |
179 | prev_ch = 0; | |
180 | matched = 0; | |
181 | do { | |
182 | if (!p_ch) | |
183 | return WM_ABORT_ALL; | |
184 | if (p_ch == '\\') { | |
185 | p_ch = *++p; | |
186 | if (!p_ch) | |
187 | return WM_ABORT_ALL; | |
188 | if (t_ch == p_ch) | |
189 | matched = 1; | |
190 | } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') { | |
191 | p_ch = *++p; | |
192 | if (p_ch == '\\') { | |
193 | p_ch = *++p; | |
194 | if (!p_ch) | |
195 | return WM_ABORT_ALL; | |
196 | } | |
197 | if (t_ch <= p_ch && t_ch >= prev_ch) | |
198 | matched = 1; | |
199 | else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) { | |
200 | uchar t_ch_upper = toupper(t_ch); | |
201 | if (t_ch_upper <= p_ch && t_ch_upper >= prev_ch) | |
202 | matched = 1; | |
203 | } | |
204 | p_ch = 0; /* This makes "prev_ch" get set to 0. */ | |
205 | } else if (p_ch == '[' && p[1] == ':') { | |
206 | const uchar *s; | |
207 | int i; | |
208 | for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/ | |
209 | if (!p_ch) | |
210 | return WM_ABORT_ALL; | |
211 | i = p - s - 1; | |
212 | if (i < 0 || p[-1] != ':') { | |
213 | /* Didn't find ":]", so treat like a normal set. */ | |
214 | p = s - 2; | |
215 | p_ch = '['; | |
216 | if (t_ch == p_ch) | |
217 | matched = 1; | |
218 | continue; | |
219 | } | |
220 | if (CC_EQ(s,i, "alnum")) { | |
221 | if (ISALNUM(t_ch)) | |
222 | matched = 1; | |
223 | } else if (CC_EQ(s,i, "alpha")) { | |
224 | if (ISALPHA(t_ch)) | |
225 | matched = 1; | |
226 | } else if (CC_EQ(s,i, "blank")) { | |
227 | if (ISBLANK(t_ch)) | |
228 | matched = 1; | |
229 | } else if (CC_EQ(s,i, "cntrl")) { | |
230 | if (ISCNTRL(t_ch)) | |
231 | matched = 1; | |
232 | } else if (CC_EQ(s,i, "digit")) { | |
233 | if (ISDIGIT(t_ch)) | |
234 | matched = 1; | |
235 | } else if (CC_EQ(s,i, "graph")) { | |
236 | if (ISGRAPH(t_ch)) | |
237 | matched = 1; | |
238 | } else if (CC_EQ(s,i, "lower")) { | |
239 | if (ISLOWER(t_ch)) | |
240 | matched = 1; | |
241 | } else if (CC_EQ(s,i, "print")) { | |
242 | if (ISPRINT(t_ch)) | |
243 | matched = 1; | |
244 | } else if (CC_EQ(s,i, "punct")) { | |
245 | if (ISPUNCT(t_ch)) | |
246 | matched = 1; | |
247 | } else if (CC_EQ(s,i, "space")) { | |
248 | if (ISSPACE(t_ch)) | |
249 | matched = 1; | |
250 | } else if (CC_EQ(s,i, "upper")) { | |
251 | if (ISUPPER(t_ch)) | |
252 | matched = 1; | |
253 | else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) | |
254 | matched = 1; | |
255 | } else if (CC_EQ(s,i, "xdigit")) { | |
256 | if (ISXDIGIT(t_ch)) | |
257 | matched = 1; | |
258 | } else /* malformed [:class:] string */ | |
259 | return WM_ABORT_ALL; | |
260 | p_ch = 0; /* This makes "prev_ch" get set to 0. */ | |
261 | } else if (t_ch == p_ch) | |
262 | matched = 1; | |
263 | } while (prev_ch = p_ch, (p_ch = *++p) != ']'); | |
264 | if (matched == negated || | |
265 | ((flags & WM_PATHNAME) && t_ch == '/')) | |
266 | return WM_NOMATCH; | |
267 | continue; | |
268 | } | |
269 | } | |
270 | ||
271 | return *text ? WM_NOMATCH : WM_MATCH; | |
272 | } | |
273 | ||
274 | /* Match the "pattern" against the "text" string. */ | |
275 | int wildmatch(const char *pattern, const char *text, unsigned int flags) | |
276 | { | |
277 | return dowild((const uchar*)pattern, (const uchar*)text, flags); | |
278 | } |