Merge branch 'maint'
[git] / wildmatch.c
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 FALSE 0
22 #define TRUE 1
23
24 #define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \
25                                     && *(class) == *(litmatch) \
26                                     && strncmp((char*)class, litmatch, len) == 0)
27
28 #if defined STDC_HEADERS || !defined isascii
29 # define ISASCII(c) 1
30 #else
31 # define ISASCII(c) isascii(c)
32 #endif
33
34 #ifdef isblank
35 # define ISBLANK(c) (ISASCII(c) && isblank(c))
36 #else
37 # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
38 #endif
39
40 #ifdef isgraph
41 # define ISGRAPH(c) (ISASCII(c) && isgraph(c))
42 #else
43 # define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
44 #endif
45
46 #define ISPRINT(c) (ISASCII(c) && isprint(c))
47 #define ISDIGIT(c) (ISASCII(c) && isdigit(c))
48 #define ISALNUM(c) (ISASCII(c) && isalnum(c))
49 #define ISALPHA(c) (ISASCII(c) && isalpha(c))
50 #define ISCNTRL(c) (ISASCII(c) && iscntrl(c))
51 #define ISLOWER(c) (ISASCII(c) && islower(c))
52 #define ISPUNCT(c) (ISASCII(c) && ispunct(c))
53 #define ISSPACE(c) (ISASCII(c) && isspace(c))
54 #define ISUPPER(c) (ISASCII(c) && isupper(c))
55 #define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
56
57 /* Match pattern "p" against "text" */
58 static int dowild(const uchar *p, const uchar *text, int force_lower_case)
59 {
60         uchar p_ch;
61         const uchar *pattern = p;
62
63         for ( ; (p_ch = *p) != '\0'; text++, p++) {
64                 int matched, match_slash, negated;
65                 uchar t_ch, prev_ch;
66                 if ((t_ch = *text) == '\0' && p_ch != '*')
67                         return ABORT_ALL;
68                 if (force_lower_case && ISUPPER(t_ch))
69                         t_ch = tolower(t_ch);
70                 if (force_lower_case && ISUPPER(p_ch))
71                         p_ch = tolower(p_ch);
72                 switch (p_ch) {
73                 case '\\':
74                         /* Literal match with following character.  Note that the test
75                          * in "default" handles the p[1] == '\0' failure case. */
76                         p_ch = *++p;
77                         /* FALLTHROUGH */
78                 default:
79                         if (t_ch != p_ch)
80                                 return NOMATCH;
81                         continue;
82                 case '?':
83                         /* Match anything but '/'. */
84                         if (t_ch == '/')
85                                 return NOMATCH;
86                         continue;
87                 case '*':
88                         if (*++p == '*') {
89                                 const uchar *prev_p = p - 2;
90                                 while (*++p == '*') {}
91                                 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, force_lower_case) == MATCH)
105                                                 return MATCH;
106                                         match_slash = TRUE;
107                                 } else
108                                         return ABORT_MALFORMED;
109                         } else
110                                 match_slash = FALSE;
111                         if (*p == '\0') {
112                                 /* Trailing "**" matches everything.  Trailing "*" matches
113                                  * only if there are no more slash characters. */
114                                 if (!match_slash) {
115                                         if (strchr((char*)text, '/') != NULL)
116                                                 return NOMATCH;
117                                 }
118                                 return MATCH;
119                         }
120                         while (1) {
121                                 if (t_ch == '\0')
122                                         break;
123                                 if ((matched = dowild(p, text,  force_lower_case)) != NOMATCH) {
124                                         if (!match_slash || matched != ABORT_TO_STARSTAR)
125                                                 return matched;
126                                 } else if (!match_slash && t_ch == '/')
127                                         return ABORT_TO_STARSTAR;
128                                 t_ch = *++text;
129                         }
130                         return ABORT_ALL;
131                 case '[':
132                         p_ch = *++p;
133 #ifdef NEGATE_CLASS2
134                         if (p_ch == NEGATE_CLASS2)
135                                 p_ch = NEGATE_CLASS;
136 #endif
137                         /* Assign literal TRUE/FALSE because of "matched" comparison. */
138                         negated = p_ch == NEGATE_CLASS? TRUE : FALSE;
139                         if (negated) {
140                                 /* Inverted character class. */
141                                 p_ch = *++p;
142                         }
143                         prev_ch = 0;
144                         matched = FALSE;
145                         do {
146                                 if (!p_ch)
147                                         return ABORT_ALL;
148                                 if (p_ch == '\\') {
149                                         p_ch = *++p;
150                                         if (!p_ch)
151                                                 return ABORT_ALL;
152                                         if (t_ch == p_ch)
153                                                 matched = TRUE;
154                                 } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
155                                         p_ch = *++p;
156                                         if (p_ch == '\\') {
157                                                 p_ch = *++p;
158                                                 if (!p_ch)
159                                                         return ABORT_ALL;
160                                         }
161                                         if (t_ch <= p_ch && t_ch >= prev_ch)
162                                                 matched = TRUE;
163                                         p_ch = 0; /* This makes "prev_ch" get set to 0. */
164                                 } else if (p_ch == '[' && p[1] == ':') {
165                                         const uchar *s;
166                                         int i;
167                                         for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
168                                         if (!p_ch)
169                                                 return ABORT_ALL;
170                                         i = p - s - 1;
171                                         if (i < 0 || p[-1] != ':') {
172                                                 /* Didn't find ":]", so treat like a normal set. */
173                                                 p = s - 2;
174                                                 p_ch = '[';
175                                                 if (t_ch == p_ch)
176                                                         matched = TRUE;
177                                                 continue;
178                                         }
179                                         if (CC_EQ(s,i, "alnum")) {
180                                                 if (ISALNUM(t_ch))
181                                                         matched = TRUE;
182                                         } else if (CC_EQ(s,i, "alpha")) {
183                                                 if (ISALPHA(t_ch))
184                                                         matched = TRUE;
185                                         } else if (CC_EQ(s,i, "blank")) {
186                                                 if (ISBLANK(t_ch))
187                                                         matched = TRUE;
188                                         } else if (CC_EQ(s,i, "cntrl")) {
189                                                 if (ISCNTRL(t_ch))
190                                                         matched = TRUE;
191                                         } else if (CC_EQ(s,i, "digit")) {
192                                                 if (ISDIGIT(t_ch))
193                                                         matched = TRUE;
194                                         } else if (CC_EQ(s,i, "graph")) {
195                                                 if (ISGRAPH(t_ch))
196                                                         matched = TRUE;
197                                         } else if (CC_EQ(s,i, "lower")) {
198                                                 if (ISLOWER(t_ch))
199                                                         matched = TRUE;
200                                         } else if (CC_EQ(s,i, "print")) {
201                                                 if (ISPRINT(t_ch))
202                                                         matched = TRUE;
203                                         } else if (CC_EQ(s,i, "punct")) {
204                                                 if (ISPUNCT(t_ch))
205                                                         matched = TRUE;
206                                         } else if (CC_EQ(s,i, "space")) {
207                                                 if (ISSPACE(t_ch))
208                                                         matched = TRUE;
209                                         } else if (CC_EQ(s,i, "upper")) {
210                                                 if (ISUPPER(t_ch))
211                                                         matched = TRUE;
212                                         } else if (CC_EQ(s,i, "xdigit")) {
213                                                 if (ISXDIGIT(t_ch))
214                                                         matched = TRUE;
215                                         } else /* malformed [:class:] string */
216                                                 return ABORT_ALL;
217                                         p_ch = 0; /* This makes "prev_ch" get set to 0. */
218                                 } else if (t_ch == p_ch)
219                                         matched = TRUE;
220                         } while (prev_ch = p_ch, (p_ch = *++p) != ']');
221                         if (matched == negated || t_ch == '/')
222                                 return NOMATCH;
223                         continue;
224                 }
225         }
226
227         return *text ? NOMATCH : MATCH;
228 }
229
230 /* Match the "pattern" against the "text" string. */
231 int wildmatch(const char *pattern, const char *text, int flags)
232 {
233         return dowild((const uchar*)pattern, (const uchar*)text,
234                       flags & FNM_CASEFOLD ? 1 :0);
235 }