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LIKE cleanup.

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This commit is contained in:
Bruce Momjian 1999-03-15 13:45:09 +00:00
parent 4a9c239063
commit 25541a5cd3
1 changed files with 26 additions and 12 deletions
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38
src/backend/utils/adt/like.c
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@ -111,7 +111,7 @@ textnlike(struct varlena *s, struct varlena *p)
}
/* $Revision: 1.22 $
/* $Revision: 1.23 $
** "like.c" A first attempt at a LIKE operator for Postgres95.
**
** Originally written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
@ -150,10 +150,8 @@ DoMatch(pg_wchar *text, pg_wchar *p)
{
int matched;
for (; *p; text ++, p++)
for (; *p && *text; text++, p++)
{
if (*text == '\0' && *p != '%')
return LIKE_ABORT;
switch (*p)
{
case '\\':
@ -161,27 +159,43 @@ DoMatch(pg_wchar *text, pg_wchar *p)
p++;
/* FALLTHROUGH */
default:
if (*text !=*p)
if (*text != *p)
return LIKE_FALSE;
continue;
break;
case '_':
/* Match anything. */
continue;
break;
case '%':
while (*++p == '%')
/* Consecutive percents act just like one. */
continue;
/* %% is the same as % according to the SQL standard */
/* Advance past all %'s */
while (*p == '%')
p++;
if (*p == '\0')
/* Trailing percent matches everything. */
return LIKE_TRUE;
while (*text)
if ((matched = DoMatch(text ++, p)) != LIKE_FALSE)
{
/* Optimization to prevent most recursion */
if ((*text == *p ||
*p == '\\' || *p == '%' || *p == '_') &&
(matched = DoMatch(text, p)) != LIKE_FALSE)
return matched;
text++;
}
return LIKE_ABORT;
}
}
return *text == '\0';
if (*text != '\0')
return LIKE_ABORT;
else
{
/* End of input string. Do we have matching string remaining? */
if (p[0] == '\0' || (p[0] == '%' && p[1] == '\0'))
return LIKE_TRUE;
else
return LIKE_ABORT;
}
}