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authorUlrich Drepper <drepper@redhat.com>1999-12-31 05:45:10 +0000
committerUlrich Drepper <drepper@redhat.com>1999-12-31 05:45:10 +0000
commita63a3c2c63c54067292bbea25ed55b749df14e81 (patch)
tree00b9baf127bac319d7718ce4294264cbec018a8a /posix
parent7137f4248dcfebd36c7436bd98c2c3ee2ec57db3 (diff)
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(regex_compile): Implement equivalence class handling.
Diffstat (limited to 'posix')
-rw-r--r--posix/regex.c136
1 files changed, 135 insertions, 1 deletions
diff --git a/posix/regex.c b/posix/regex.c
index 34b1d28..e1a6917 100644
--- a/posix/regex.c
+++ b/posix/regex.c
@@ -78,7 +78,11 @@
__re_search_2 (bufp, st1, s1, st2, s2, startpos, range, regs, stop)
# define re_compile_fastmap(bufp) __re_compile_fastmap (bufp)
-#define btowc __btowc
+# define btowc __btowc
+
+/* We are also using some library internals. */
+# include <locale/localeinfo.h>
+# include <langinfo.h>
#endif
/* This is for other GNU distributions with internationalized messages. */
@@ -2374,6 +2378,136 @@ regex_compile (pattern, size, syntax, bufp)
had_char_class = false;
}
}
+#ifdef _LIBC
+ else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == '=')
+ {
+ unsigned char str[MB_LEN_MAX + 1];
+ uint32_t nrules =
+ _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
+
+ PATFETCH (c);
+ c1 = 0;
+
+ /* If pattern is `[[='. */
+ if (p == pend) FREE_STACK_RETURN (REG_EBRACK);
+
+ for (;;)
+ {
+ PATFETCH (c);
+ if ((c == '=' && *p == ']') || p == pend)
+ break;
+ if (c1 < MB_LEN_MAX)
+ str[c1++] = c;
+ else
+ /* This is in any case an invalid class name. */
+ str[0] = '\0';
+ }
+ str[c1] = '\0';
+
+ if (c == '=' && *p == ']' && str[0] != '\0')
+ {
+ /* If we have no collation data we use the default
+ collation in which each character is in a class
+ by itself. It also means that ASCII is the
+ character set and therefore we cannot have character
+ with more than one byte in the multibyte
+ representation. */
+ if (nrules == 0)
+ {
+ if (c1 != 1)
+ FREE_STACK_RETURN (REG_ECOLLATE);
+
+ /* Throw away the ] at the end of the equivalence
+ class. */
+ PATFETCH (c);
+
+ /* Set the bit for the character. */
+ SET_LIST_BIT (str[0]);
+ }
+ else
+ {
+ /* Try to match the byte sequence in `str' against
+ those known to the collate implementation.
+ First find out whether the bytes in `str' are
+ actually from exactly one character. */
+ const int32_t *table;
+ const unsigned char *weights;
+ const unsigned char *extra;
+ const int32_t *indirect;
+ int32_t idx;
+ const unsigned char *cp = str;
+ int32_t weight;
+ int ch;
+
+ /* This #include defines a local function! */
+# include <locale/weight.h>
+
+ table = (const int32_t *)
+ _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
+ weights = (const unsigned char *)
+ _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB);
+ extra = (const unsigned char *)
+ _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
+ indirect = (const int32_t *)
+ _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB);
+
+ idx = findidx (&cp);
+ if (idx == 0 || cp < str + c1)
+ /* This is no valid character. */
+ FREE_STACK_RETURN (REG_ECOLLATE);
+
+ /* Throw away the ] at the end of the equivalence
+ class. */
+ PATFETCH (c);
+
+ /* Now we have to go throught the whole table
+ and find all characters which have the same
+ first level weight.
+
+ XXX Note that this is not entirely correct.
+ we would have to match multibyte sequences
+ but this is not possible with the current
+ implementation. */
+ for (ch = 1; ch < 256; ++ch)
+ /* XXX This test would have to be changed if we
+ would allow matching multibyte sequences. */
+ if (table[ch] > 0)
+ {
+ int32_t idx2 = table[ch];
+ size_t len = weights[idx2];
+
+ /* Test whether the lenghts match. */
+ if (weights[idx] == len)
+ {
+ /* They do. New compare the bytes of
+ the weight. */
+ size_t cnt = 0;
+
+ while (cnt < len
+ && (weights[idx + 1 + cnt]
+ == weights[idx2 + 1 + cnt]))
+ ++len;
+
+ if (cnt == len)
+ /* They match. Mark the character as
+ acceptable. */
+ SET_LIST_BIT (ch);
+ }
+ }
+ }
+ had_char_class = true;
+ }
+ else
+ {
+ c1++;
+ while (c1--)
+ PATUNFETCH;
+ SET_LIST_BIT ('[');
+ SET_LIST_BIT ('=');
+ had_char_class = false;
+ }
+ }
+#endif
else
{
had_char_class = false;