wildmatch: make dowild() take arbitrary flags
[thirdparty/git.git] / wildmatch.c
CommitLineData
5230f605
NTND
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
feabcc17
NTND
12#include "cache.h"
13#include "wildmatch.h"
14
15typedef unsigned char uchar;
5230f605
NTND
16
17/* What character marks an inverted character class? */
18#define NEGATE_CLASS '!'
19#define NEGATE_CLASS2 '^'
20
5230f605
NTND
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
b0e02876 54/* Match pattern "p" against "text" */
0c528168 55static int dowild(const uchar *p, const uchar *text, unsigned int flags)
5230f605 56{
327f2f3e 57 uchar p_ch;
3a078dec 58 const uchar *pattern = p;
5230f605 59
327f2f3e 60 for ( ; (p_ch = *p) != '\0'; text++, p++) {
b6a3d335 61 int matched, match_slash, negated;
327f2f3e
NTND
62 uchar t_ch, prev_ch;
63 if ((t_ch = *text) == '\0' && p_ch != '*')
9b3497ca 64 return WM_ABORT_ALL;
0c528168 65 if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
327f2f3e 66 t_ch = tolower(t_ch);
0c528168 67 if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
164bf83a 68 p_ch = tolower(p_ch);
327f2f3e
NTND
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. */
5230f605 73 p_ch = *++p;
327f2f3e
NTND
74 /* FALLTHROUGH */
75 default:
76 if (t_ch != p_ch)
9b3497ca 77 return WM_NOMATCH;
327f2f3e
NTND
78 continue;
79 case '?':
80 /* Match anything but '/'. */
81 if (t_ch == '/')
9b3497ca 82 return WM_NOMATCH;
5230f605 83 continue;
327f2f3e
NTND
84 case '*':
85 if (*++p == '*') {
40bbee0a 86 const uchar *prev_p = p - 2;
327f2f3e 87 while (*++p == '*') {}
3a078dec 88 if ((prev_p < pattern || *prev_p == '/') &&
40bbee0a
NTND
89 (*p == '\0' || *p == '/' ||
90 (p[0] == '\\' && p[1] == '/'))) {
4c251e5c
NTND
91 /*
92 * Assuming we already match 'foo/' and are at
93 * <star star slash>, just assume it matches
94 * nothing and go ahead match the rest of the
95 * pattern with the remaining string. This
96 * helps make foo/<*><*>/bar (<> because
97 * otherwise it breaks C comment syntax) match
98 * both foo/bar and foo/a/bar.
99 */
100 if (p[0] == '/' &&
0c528168 101 dowild(p + 1, text, flags) == WM_MATCH)
9b3497ca
NTND
102 return WM_MATCH;
103 match_slash = 1;
40bbee0a 104 } else
9b3497ca 105 return WM_ABORT_MALFORMED;
327f2f3e 106 } else
9b3497ca 107 match_slash = 0;
327f2f3e
NTND
108 if (*p == '\0') {
109 /* Trailing "**" matches everything. Trailing "*" matches
110 * only if there are no more slash characters. */
b6a3d335 111 if (!match_slash) {
327f2f3e 112 if (strchr((char*)text, '/') != NULL)
9b3497ca 113 return WM_NOMATCH;
327f2f3e 114 }
9b3497ca 115 return WM_MATCH;
327f2f3e
NTND
116 }
117 while (1) {
118 if (t_ch == '\0')
119 break;
0c528168 120 if ((matched = dowild(p, text, flags)) != WM_NOMATCH) {
9b3497ca 121 if (!match_slash || matched != WM_ABORT_TO_STARSTAR)
327f2f3e 122 return matched;
b6a3d335 123 } else if (!match_slash && t_ch == '/')
9b3497ca 124 return WM_ABORT_TO_STARSTAR;
327f2f3e
NTND
125 t_ch = *++text;
126 }
9b3497ca 127 return WM_ABORT_ALL;
327f2f3e
NTND
128 case '[':
129 p_ch = *++p;
130#ifdef NEGATE_CLASS2
131 if (p_ch == NEGATE_CLASS2)
132 p_ch = NEGATE_CLASS;
133#endif
9b3497ca
NTND
134 /* Assign literal 1/0 because of "matched" comparison. */
135 negated = p_ch == NEGATE_CLASS ? 1 : 0;
b6a3d335 136 if (negated) {
327f2f3e
NTND
137 /* Inverted character class. */
138 p_ch = *++p;
139 }
140 prev_ch = 0;
9b3497ca 141 matched = 0;
327f2f3e
NTND
142 do {
143 if (!p_ch)
9b3497ca 144 return WM_ABORT_ALL;
327f2f3e
NTND
145 if (p_ch == '\\') {
146 p_ch = *++p;
147 if (!p_ch)
9b3497ca 148 return WM_ABORT_ALL;
327f2f3e 149 if (t_ch == p_ch)
9b3497ca 150 matched = 1;
327f2f3e
NTND
151 } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
152 p_ch = *++p;
153 if (p_ch == '\\') {
154 p_ch = *++p;
155 if (!p_ch)
9b3497ca 156 return WM_ABORT_ALL;
327f2f3e
NTND
157 }
158 if (t_ch <= p_ch && t_ch >= prev_ch)
9b3497ca 159 matched = 1;
327f2f3e
NTND
160 p_ch = 0; /* This makes "prev_ch" get set to 0. */
161 } else if (p_ch == '[' && p[1] == ':') {
162 const uchar *s;
163 int i;
164 for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
165 if (!p_ch)
9b3497ca 166 return WM_ABORT_ALL;
327f2f3e
NTND
167 i = p - s - 1;
168 if (i < 0 || p[-1] != ':') {
169 /* Didn't find ":]", so treat like a normal set. */
170 p = s - 2;
171 p_ch = '[';
172 if (t_ch == p_ch)
9b3497ca 173 matched = 1;
327f2f3e
NTND
174 continue;
175 }
176 if (CC_EQ(s,i, "alnum")) {
177 if (ISALNUM(t_ch))
9b3497ca 178 matched = 1;
327f2f3e
NTND
179 } else if (CC_EQ(s,i, "alpha")) {
180 if (ISALPHA(t_ch))
9b3497ca 181 matched = 1;
327f2f3e
NTND
182 } else if (CC_EQ(s,i, "blank")) {
183 if (ISBLANK(t_ch))
9b3497ca 184 matched = 1;
327f2f3e
NTND
185 } else if (CC_EQ(s,i, "cntrl")) {
186 if (ISCNTRL(t_ch))
9b3497ca 187 matched = 1;
327f2f3e
NTND
188 } else if (CC_EQ(s,i, "digit")) {
189 if (ISDIGIT(t_ch))
9b3497ca 190 matched = 1;
327f2f3e
NTND
191 } else if (CC_EQ(s,i, "graph")) {
192 if (ISGRAPH(t_ch))
9b3497ca 193 matched = 1;
327f2f3e
NTND
194 } else if (CC_EQ(s,i, "lower")) {
195 if (ISLOWER(t_ch))
9b3497ca 196 matched = 1;
327f2f3e
NTND
197 } else if (CC_EQ(s,i, "print")) {
198 if (ISPRINT(t_ch))
9b3497ca 199 matched = 1;
327f2f3e
NTND
200 } else if (CC_EQ(s,i, "punct")) {
201 if (ISPUNCT(t_ch))
9b3497ca 202 matched = 1;
327f2f3e
NTND
203 } else if (CC_EQ(s,i, "space")) {
204 if (ISSPACE(t_ch))
9b3497ca 205 matched = 1;
327f2f3e
NTND
206 } else if (CC_EQ(s,i, "upper")) {
207 if (ISUPPER(t_ch))
9b3497ca 208 matched = 1;
327f2f3e
NTND
209 } else if (CC_EQ(s,i, "xdigit")) {
210 if (ISXDIGIT(t_ch))
9b3497ca 211 matched = 1;
327f2f3e 212 } else /* malformed [:class:] string */
9b3497ca 213 return WM_ABORT_ALL;
327f2f3e
NTND
214 p_ch = 0; /* This makes "prev_ch" get set to 0. */
215 } else if (t_ch == p_ch)
9b3497ca 216 matched = 1;
327f2f3e 217 } while (prev_ch = p_ch, (p_ch = *++p) != ']');
b6a3d335 218 if (matched == negated || t_ch == '/')
9b3497ca 219 return WM_NOMATCH;
327f2f3e
NTND
220 continue;
221 }
5230f605 222 }
5230f605 223
9b3497ca 224 return *text ? WM_NOMATCH : WM_MATCH;
5230f605
NTND
225}
226
227/* Match the "pattern" against the "text" string. */
9b3497ca
NTND
228int wildmatch(const char *pattern, const char *text,
229 unsigned int flags, struct wildopts *wo)
5230f605 230{
0c528168 231 return dowild((const uchar*)pattern, (const uchar*)text, flags);
5230f605 232}