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 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, int force_lower_case)
  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 (force_lower_case && ISUPPER(t_ch))
  66                         t_ch = tolower(t_ch);
  67                 if (force_lower_case && 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 (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 ((prev_p < pattern || *prev_p == '/') &&
  89                                     (*p == '\0' || *p == '/' ||
  90                                      (p[0] == '\\' && p[1] == '/'))) {
  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] == '/' &&
 101                                             dowild(p + 1, text, force_lower_case) == WM_MATCH)
 102                                                 return WM_MATCH;
 103                                         match_slash = 1;
 104                                 } else
 105                                         return WM_ABORT_MALFORMED;
 106                         } else
 107                                 match_slash = 0;
 108                         if (*p == '\0') {
 109                                 /* Trailing "**" matches everything.  Trailing "*" matches
 110                                  * only if there are no more slash characters. */
 111                                 if (!match_slash) {
 112                                         if (strchr((char*)text, '/') != NULL)
 113                                                 return WM_NOMATCH;
 114                                 }
 115                                 return WM_MATCH;
 116                         }
 117                         while (1) {
 118                                 if (t_ch == '\0')
 119                                         break;
 120                                 if ((matched = dowild(p, text,  force_lower_case)) != WM_NOMATCH) {
 121                                         if (!match_slash || matched != WM_ABORT_TO_STARSTAR)
 122                                                 return matched;
 123                                 } else if (!match_slash && t_ch == '/')
 124                                         return WM_ABORT_TO_STARSTAR;
 125                                 t_ch = *++text;
 126                         }
 127                         return WM_ABORT_ALL;
 128                 case '[':
 129                         p_ch = *++p;
 130 #ifdef NEGATE_CLASS2
 131                         if (p_ch == NEGATE_CLASS2)
 132                                 p_ch = NEGATE_CLASS;
 133 #endif
 134                         /* Assign literal 1/0 because of "matched" comparison. */
 135                         negated = p_ch == NEGATE_CLASS ? 1 : 0;
 136                         if (negated) {
 137                                 /* Inverted character class. */
 138                                 p_ch = *++p;
 139                         }
 140                         prev_ch = 0;
 141                         matched = 0;
 142                         do {
 143                                 if (!p_ch)
 144                                         return WM_ABORT_ALL;
 145                                 if (p_ch == '\\') {
 146                                         p_ch = *++p;
 147                                         if (!p_ch)
 148                                                 return WM_ABORT_ALL;
 149                                         if (t_ch == p_ch)
 150                                                 matched = 1;
 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)
 156                                                         return WM_ABORT_ALL;
 157                                         }
 158                                         if (t_ch <= p_ch && t_ch >= prev_ch)
 159                                                 matched = 1;
 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)
 166                                                 return WM_ABORT_ALL;
 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)
 173                                                         matched = 1;
 174                                                 continue;
 175                                         }
 176                                         if (CC_EQ(s,i, "alnum")) {
 177                                                 if (ISALNUM(t_ch))
 178                                                         matched = 1;
 179                                         } else if (CC_EQ(s,i, "alpha")) {
 180                                                 if (ISALPHA(t_ch))
 181                                                         matched = 1;
 182                                         } else if (CC_EQ(s,i, "blank")) {
 183                                                 if (ISBLANK(t_ch))
 184                                                         matched = 1;
 185                                         } else if (CC_EQ(s,i, "cntrl")) {
 186                                                 if (ISCNTRL(t_ch))
 187                                                         matched = 1;
 188                                         } else if (CC_EQ(s,i, "digit")) {
 189                                                 if (ISDIGIT(t_ch))
 190                                                         matched = 1;
 191                                         } else if (CC_EQ(s,i, "graph")) {
 192                                                 if (ISGRAPH(t_ch))
 193                                                         matched = 1;
 194                                         } else if (CC_EQ(s,i, "lower")) {
 195                                                 if (ISLOWER(t_ch))
 196                                                         matched = 1;
 197                                         } else if (CC_EQ(s,i, "print")) {
 198                                                 if (ISPRINT(t_ch))
 199                                                         matched = 1;
 200                                         } else if (CC_EQ(s,i, "punct")) {
 201                                                 if (ISPUNCT(t_ch))
 202                                                         matched = 1;
 203                                         } else if (CC_EQ(s,i, "space")) {
 204                                                 if (ISSPACE(t_ch))
 205                                                         matched = 1;
 206                                         } else if (CC_EQ(s,i, "upper")) {
 207                                                 if (ISUPPER(t_ch))
 208                                                         matched = 1;
 209                                         } else if (CC_EQ(s,i, "xdigit")) {
 210                                                 if (ISXDIGIT(t_ch))
 211                                                         matched = 1;
 212                                         } else /* malformed [:class:] string */
 213                                                 return WM_ABORT_ALL;
 214                                         p_ch = 0; /* This makes "prev_ch" get set to 0. */
 215                                 } else if (t_ch == p_ch)
 216                                         matched = 1;
 217                         } while (prev_ch = p_ch, (p_ch = *++p) != ']');
 218                         if (matched == negated || t_ch == '/')
 219                                 return WM_NOMATCH;
 220                         continue;
 221                 }
 222         }
 223
 224         return *text ? WM_NOMATCH : WM_MATCH;
 225 }
 226
 227 /* Match the "pattern" against the "text" string. */
 228 int wildmatch(const char *pattern, const char *text,
 229               unsigned int flags, struct wildopts *wo)
 230 {
 231         return dowild((const uchar*)pattern, (const uchar*)text,
 232                       flags & WM_CASEFOLD ? 1 :0);
 233 }