wildmatch: make wildmatch's return value compatible with fnmatch
[git/git.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 NOMATCH 1
25 #define MATCH 0
26 #define ABORT_ALL -1
27 #define ABORT_TO_STARSTAR -2
28
29 #define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \
30 && *(class) == *(litmatch) \
31 && strncmp((char*)class, litmatch, len) == 0)
32
33 #if defined STDC_HEADERS || !defined isascii
34 # define ISASCII(c) 1
35 #else
36 # define ISASCII(c) isascii(c)
37 #endif
38
39 #ifdef isblank
40 # define ISBLANK(c) (ISASCII(c) && isblank(c))
41 #else
42 # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
43 #endif
44
45 #ifdef isgraph
46 # define ISGRAPH(c) (ISASCII(c) && isgraph(c))
47 #else
48 # define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
49 #endif
50
51 #define ISPRINT(c) (ISASCII(c) && isprint(c))
52 #define ISDIGIT(c) (ISASCII(c) && isdigit(c))
53 #define ISALNUM(c) (ISASCII(c) && isalnum(c))
54 #define ISALPHA(c) (ISASCII(c) && isalpha(c))
55 #define ISCNTRL(c) (ISASCII(c) && iscntrl(c))
56 #define ISLOWER(c) (ISASCII(c) && islower(c))
57 #define ISPUNCT(c) (ISASCII(c) && ispunct(c))
58 #define ISSPACE(c) (ISASCII(c) && isspace(c))
59 #define ISUPPER(c) (ISASCII(c) && isupper(c))
60 #define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
61
62 static int force_lower_case = 0;
63
64 /* Match pattern "p" against "text" */
65 static int dowild(const uchar *p, const uchar *text)
66 {
67 uchar p_ch;
68
69 for ( ; (p_ch = *p) != '\0'; text++, p++) {
70 int matched, special;
71 uchar t_ch, prev_ch;
72 if ((t_ch = *text) == '\0' && p_ch != '*')
73 return ABORT_ALL;
74 if (force_lower_case && ISUPPER(t_ch))
75 t_ch = tolower(t_ch);
76 switch (p_ch) {
77 case '\\':
78 /* Literal match with following character. Note that the test
79 * in "default" handles the p[1] == '\0' failure case. */
80 p_ch = *++p;
81 /* FALLTHROUGH */
82 default:
83 if (t_ch != p_ch)
84 return NOMATCH;
85 continue;
86 case '?':
87 /* Match anything but '/'. */
88 if (t_ch == '/')
89 return NOMATCH;
90 continue;
91 case '*':
92 if (*++p == '*') {
93 while (*++p == '*') {}
94 special = TRUE;
95 } else
96 special = FALSE;
97 if (*p == '\0') {
98 /* Trailing "**" matches everything. Trailing "*" matches
99 * only if there are no more slash characters. */
100 if (!special) {
101 if (strchr((char*)text, '/') != NULL)
102 return NOMATCH;
103 }
104 return MATCH;
105 }
106 while (1) {
107 if (t_ch == '\0')
108 break;
109 if ((matched = dowild(p, text)) != NOMATCH) {
110 if (!special || matched != ABORT_TO_STARSTAR)
111 return matched;
112 } else if (!special && t_ch == '/')
113 return ABORT_TO_STARSTAR;
114 t_ch = *++text;
115 }
116 return ABORT_ALL;
117 case '[':
118 p_ch = *++p;
119 #ifdef NEGATE_CLASS2
120 if (p_ch == NEGATE_CLASS2)
121 p_ch = NEGATE_CLASS;
122 #endif
123 /* Assign literal TRUE/FALSE because of "matched" comparison. */
124 special = p_ch == NEGATE_CLASS? TRUE : FALSE;
125 if (special) {
126 /* Inverted character class. */
127 p_ch = *++p;
128 }
129 prev_ch = 0;
130 matched = FALSE;
131 do {
132 if (!p_ch)
133 return ABORT_ALL;
134 if (p_ch == '\\') {
135 p_ch = *++p;
136 if (!p_ch)
137 return ABORT_ALL;
138 if (t_ch == p_ch)
139 matched = TRUE;
140 } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
141 p_ch = *++p;
142 if (p_ch == '\\') {
143 p_ch = *++p;
144 if (!p_ch)
145 return ABORT_ALL;
146 }
147 if (t_ch <= p_ch && t_ch >= prev_ch)
148 matched = TRUE;
149 p_ch = 0; /* This makes "prev_ch" get set to 0. */
150 } else if (p_ch == '[' && p[1] == ':') {
151 const uchar *s;
152 int i;
153 for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
154 if (!p_ch)
155 return ABORT_ALL;
156 i = p - s - 1;
157 if (i < 0 || p[-1] != ':') {
158 /* Didn't find ":]", so treat like a normal set. */
159 p = s - 2;
160 p_ch = '[';
161 if (t_ch == p_ch)
162 matched = TRUE;
163 continue;
164 }
165 if (CC_EQ(s,i, "alnum")) {
166 if (ISALNUM(t_ch))
167 matched = TRUE;
168 } else if (CC_EQ(s,i, "alpha")) {
169 if (ISALPHA(t_ch))
170 matched = TRUE;
171 } else if (CC_EQ(s,i, "blank")) {
172 if (ISBLANK(t_ch))
173 matched = TRUE;
174 } else if (CC_EQ(s,i, "cntrl")) {
175 if (ISCNTRL(t_ch))
176 matched = TRUE;
177 } else if (CC_EQ(s,i, "digit")) {
178 if (ISDIGIT(t_ch))
179 matched = TRUE;
180 } else if (CC_EQ(s,i, "graph")) {
181 if (ISGRAPH(t_ch))
182 matched = TRUE;
183 } else if (CC_EQ(s,i, "lower")) {
184 if (ISLOWER(t_ch))
185 matched = TRUE;
186 } else if (CC_EQ(s,i, "print")) {
187 if (ISPRINT(t_ch))
188 matched = TRUE;
189 } else if (CC_EQ(s,i, "punct")) {
190 if (ISPUNCT(t_ch))
191 matched = TRUE;
192 } else if (CC_EQ(s,i, "space")) {
193 if (ISSPACE(t_ch))
194 matched = TRUE;
195 } else if (CC_EQ(s,i, "upper")) {
196 if (ISUPPER(t_ch))
197 matched = TRUE;
198 } else if (CC_EQ(s,i, "xdigit")) {
199 if (ISXDIGIT(t_ch))
200 matched = TRUE;
201 } else /* malformed [:class:] string */
202 return ABORT_ALL;
203 p_ch = 0; /* This makes "prev_ch" get set to 0. */
204 } else if (t_ch == p_ch)
205 matched = TRUE;
206 } while (prev_ch = p_ch, (p_ch = *++p) != ']');
207 if (matched == special || t_ch == '/')
208 return NOMATCH;
209 continue;
210 }
211 }
212
213 return *text ? NOMATCH : MATCH;
214 }
215
216 /* Match the "pattern" against the "text" string. */
217 int wildmatch(const char *pattern, const char *text)
218 {
219 return dowild((const uchar*)pattern, (const uchar*)text);
220 }
221
222 /* Match the "pattern" against the forced-to-lower-case "text" string. */
223 int iwildmatch(const char *pattern, const char *text)
224 {
225 int ret;
226 force_lower_case = 1;
227 ret = dowild((const uchar*)pattern, (const uchar*)text);
228 force_lower_case = 0;
229 return ret;
230 }