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 "git-compat-util.h"
  13 #include "wildmatch.h"
  14
  15 typedef unsigned char uchar;
  16
  17 /* Internal return values */
  18 #define WM_ABORT_ALL -1
  19 #define WM_ABORT_TO_STARSTAR -2
  20
  21 /* What character marks an inverted character class? */
  22 #define NEGATE_CLASS    '!'
  23 #define NEGATE_CLASS2   '^'
  24
  25 #define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \
  26                                     && *(class) == *(litmatch) \
  27                                     && strncmp((char*)class, litmatch, len) == 0)
  28
  29 #if defined STDC_HEADERS || !defined isascii
  30 # define ISASCII(c) 1
  31 #else
  32 # define ISASCII(c) isascii(c)
  33 #endif
  34
  35 #ifdef isblank
  36 # define ISBLANK(c) (ISASCII(c) && isblank(c))
  37 #else
  38 # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
  39 #endif
  40
  41 #ifdef isgraph
  42 # define ISGRAPH(c) (ISASCII(c) && isgraph(c))
  43 #else
  44 # define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
  45 #endif
  46
  47 #define ISPRINT(c) (ISASCII(c) && isprint(c))
  48 #define ISDIGIT(c) (ISASCII(c) && isdigit(c))
  49 #define ISALNUM(c) (ISASCII(c) && isalnum(c))
  50 #define ISALPHA(c) (ISASCII(c) && isalpha(c))
  51 #define ISCNTRL(c) (ISASCII(c) && iscntrl(c))
  52 #define ISLOWER(c) (ISASCII(c) && islower(c))
  53 #define ISPUNCT(c) (ISASCII(c) && ispunct(c))
  54 #define ISSPACE(c) (ISASCII(c) && isspace(c))
  55 #define ISUPPER(c) (ISASCII(c) && isupper(c))
  56 #define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
  57
  58 /* Match pattern "p" against "text" */
  59 static int dowild(const uchar *p, const uchar *text, unsigned int flags)
  60 {
  61         uchar p_ch;
  62         const uchar *pattern = p;
  63
  64         for ( ; (p_ch = *p) != '\0'; text++, p++) {
  65                 int matched, match_slash, negated;
  66                 uchar t_ch, prev_ch;
  67                 if ((t_ch = *text) == '\0' && p_ch != '*')
  68                         return WM_ABORT_ALL;
  69                 if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
  70                         t_ch = tolower(t_ch);
  71                 if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
  72                         p_ch = tolower(p_ch);
  73                 switch (p_ch) {
  74                 case '\\':
  75                         /* Literal match with following character.  Note that the test
  76                          * in "default" handles the p[1] == '\0' failure case. */
  77                         p_ch = *++p;
  78                         /* FALLTHROUGH */
  79                 default:
  80                         if (t_ch != p_ch)
  81                                 return WM_NOMATCH;
  82                         continue;
  83                 case '?':
  84                         /* Match anything but '/'. */
  85                         if ((flags & WM_PATHNAME) && t_ch == '/')
  86                                 return WM_NOMATCH;
  87                         continue;
  88                 case '*':
  89                         if (*++p == '*') {
  90                                 const uchar *prev_p = p;
  91                                 while (*++p == '*') {}
  92                                 if (!(flags & WM_PATHNAME))
  93                                         /* without WM_PATHNAME, '*' == '**' */
  94                                         match_slash = 1;
  95                                 else if ((prev_p - pattern < 2 || *(prev_p - 2) == '/') &&
  96                                     (*p == '\0' || *p == '/' ||
  97                                      (p[0] == '\\' && p[1] == '/'))) {
  98                                         /*
  99                                          * Assuming we already match 'foo/' and are at
 100                                          * <star star slash>, just assume it matches
 101                                          * nothing and go ahead match the rest of the
 102                                          * pattern with the remaining string. This
 103                                          * helps make foo/<*><*>/bar (<> because
 104                                          * otherwise it breaks C comment syntax) match
 105                                          * both foo/bar and foo/a/bar.
 106                                          */
 107                                         if (p[0] == '/' &&
 108                                             dowild(p + 1, text, flags) == WM_MATCH)
 109                                                 return WM_MATCH;
 110                                         match_slash = 1;
 111                                 } else /* WM_PATHNAME is set */
 112                                         match_slash = 0;
 113                         } else
 114                                 /* without WM_PATHNAME, '*' == '**' */
 115                                 match_slash = flags & WM_PATHNAME ? 0 : 1;
 116                         if (*p == '\0') {
 117                                 /* Trailing "**" matches everything.  Trailing "*" matches
 118                                  * only if there are no more slash characters. */
 119                                 if (!match_slash) {
 120                                         if (strchr((char *)text, '/'))
 121                                                 return WM_ABORT_TO_STARSTAR;
 122                                 }
 123                                 return WM_MATCH;
 124                         } else if (!match_slash && *p == '/') {
 125                                 /*
 126                                  * _one_ asterisk followed by a slash
 127                                  * with WM_PATHNAME matches the next
 128                                  * directory
 129                                  */
 130                                 const char *slash = strchr((char*)text, '/');
 131                                 if (!slash)
 132                                         return WM_ABORT_ALL;
 133                                 text = (const uchar*)slash;
 134                                 /* the slash is consumed by the top-level for loop */
 135                                 break;
 136                         }
 137                         while (1) {
 138                                 if (t_ch == '\0')
 139                                         break;
 140                                 /*
 141                                  * Try to advance faster when an asterisk is
 142                                  * followed by a literal. We know in this case
 143                                  * that the string before the literal
 144                                  * must belong to "*".
 145                                  * If match_slash is false, do not look past
 146                                  * the first slash as it cannot belong to '*'.
 147                                  */
 148                                 if (!is_glob_special(*p)) {
 149                                         p_ch = *p;
 150                                         if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
 151                                                 p_ch = tolower(p_ch);
 152                                         while ((t_ch = *text) != '\0' &&
 153                                                (match_slash || t_ch != '/')) {
 154                                                 if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
 155                                                         t_ch = tolower(t_ch);
 156                                                 if (t_ch == p_ch)
 157                                                         break;
 158                                                 text++;
 159                                         }
 160                                         if (t_ch != p_ch) {
 161                                                 if (match_slash)
 162                                                         return WM_ABORT_ALL;
 163                                                 else
 164                                                         return WM_ABORT_TO_STARSTAR;
 165                                         }
 166                                 }
 167                                 if ((matched = dowild(p, text, flags)) != WM_NOMATCH) {
 168                                         if (!match_slash || matched != WM_ABORT_TO_STARSTAR)
 169                                                 return matched;
 170                                 } else if (!match_slash && t_ch == '/')
 171                                         return WM_ABORT_TO_STARSTAR;
 172                                 t_ch = *++text;
 173                         }
 174                         return WM_ABORT_ALL;
 175                 case '[':
 176                         p_ch = *++p;
 177 #ifdef NEGATE_CLASS2
 178                         if (p_ch == NEGATE_CLASS2)
 179                                 p_ch = NEGATE_CLASS;
 180 #endif
 181                         /* Assign literal 1/0 because of "matched" comparison. */
 182                         negated = p_ch == NEGATE_CLASS ? 1 : 0;
 183                         if (negated) {
 184                                 /* Inverted character class. */
 185                                 p_ch = *++p;
 186                         }
 187                         prev_ch = 0;
 188                         matched = 0;
 189                         do {
 190                                 if (!p_ch)
 191                                         return WM_ABORT_ALL;
 192                                 if (p_ch == '\\') {
 193                                         p_ch = *++p;
 194                                         if (!p_ch)
 195                                                 return WM_ABORT_ALL;
 196                                         if (t_ch == p_ch)
 197                                                 matched = 1;
 198                                 } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
 199                                         p_ch = *++p;
 200                                         if (p_ch == '\\') {
 201                                                 p_ch = *++p;
 202                                                 if (!p_ch)
 203                                                         return WM_ABORT_ALL;
 204                                         }
 205                                         if (t_ch <= p_ch && t_ch >= prev_ch)
 206                                                 matched = 1;
 207                                         else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) {
 208                                                 uchar t_ch_upper = toupper(t_ch);
 209                                                 if (t_ch_upper <= p_ch && t_ch_upper >= prev_ch)
 210                                                         matched = 1;
 211                                         }
 212                                         p_ch = 0; /* This makes "prev_ch" get set to 0. */
 213                                 } else if (p_ch == '[' && p[1] == ':') {
 214                                         const uchar *s;
 215                                         int i;
 216                                         for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
 217                                         if (!p_ch)
 218                                                 return WM_ABORT_ALL;
 219                                         i = p - s - 1;
 220                                         if (i < 0 || p[-1] != ':') {
 221                                                 /* Didn't find ":]", so treat like a normal set. */
 222                                                 p = s - 2;
 223                                                 p_ch = '[';
 224                                                 if (t_ch == p_ch)
 225                                                         matched = 1;
 226                                                 continue;
 227                                         }
 228                                         if (CC_EQ(s,i, "alnum")) {
 229                                                 if (ISALNUM(t_ch))
 230                                                         matched = 1;
 231                                         } else if (CC_EQ(s,i, "alpha")) {
 232                                                 if (ISALPHA(t_ch))
 233                                                         matched = 1;
 234                                         } else if (CC_EQ(s,i, "blank")) {
 235                                                 if (ISBLANK(t_ch))
 236                                                         matched = 1;
 237                                         } else if (CC_EQ(s,i, "cntrl")) {
 238                                                 if (ISCNTRL(t_ch))
 239                                                         matched = 1;
 240                                         } else if (CC_EQ(s,i, "digit")) {
 241                                                 if (ISDIGIT(t_ch))
 242                                                         matched = 1;
 243                                         } else if (CC_EQ(s,i, "graph")) {
 244                                                 if (ISGRAPH(t_ch))
 245                                                         matched = 1;
 246                                         } else if (CC_EQ(s,i, "lower")) {
 247                                                 if (ISLOWER(t_ch))
 248                                                         matched = 1;
 249                                         } else if (CC_EQ(s,i, "print")) {
 250                                                 if (ISPRINT(t_ch))
 251                                                         matched = 1;
 252                                         } else if (CC_EQ(s,i, "punct")) {
 253                                                 if (ISPUNCT(t_ch))
 254                                                         matched = 1;
 255                                         } else if (CC_EQ(s,i, "space")) {
 256                                                 if (ISSPACE(t_ch))
 257                                                         matched = 1;
 258                                         } else if (CC_EQ(s,i, "upper")) {
 259                                                 if (ISUPPER(t_ch))
 260                                                         matched = 1;
 261                                                 else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch))
 262                                                         matched = 1;
 263                                         } else if (CC_EQ(s,i, "xdigit")) {
 264                                                 if (ISXDIGIT(t_ch))
 265                                                         matched = 1;
 266                                         } else /* malformed [:class:] string */
 267                                                 return WM_ABORT_ALL;
 268                                         p_ch = 0; /* This makes "prev_ch" get set to 0. */
 269                                 } else if (t_ch == p_ch)
 270                                         matched = 1;
 271                         } while (prev_ch = p_ch, (p_ch = *++p) != ']');
 272                         if (matched == negated ||
 273                             ((flags & WM_PATHNAME) && t_ch == '/'))
 274                                 return WM_NOMATCH;
 275                         continue;
 276                 }
 277         }
 278
 279         return *text ? WM_NOMATCH : WM_MATCH;
 280 }
 281
 282 /* Match the "pattern" against the "text" string. */
 283 int wildmatch(const char *pattern, const char *text, unsigned int flags)
 284 {
 285         int res = dowild((const uchar*)pattern, (const uchar*)text, flags);
 286         return res == WM_MATCH ? WM_MATCH : WM_NOMATCH;
 287 }