summaryrefslogtreecommitdiff
path: root/name-hash.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-21 22:55:19 (GMT)
committerJunio C Hamano <gitster@pobox.com>2008-04-09 08:22:25 (GMT)
commitcd2fef59edf72a1d9792d9cb72aae1e6f6c7b1d4 (patch)
tree720d22370ec0831e4ff8800d96ddd19c90106d69 /name-hash.c
parentdf292c791ab790340cc9e3577a073bcb9d1900ea (diff)
downloadgit-cd2fef59edf72a1d9792d9cb72aae1e6f6c7b1d4.zip
git-cd2fef59edf72a1d9792d9cb72aae1e6f6c7b1d4.tar.gz
git-cd2fef59edf72a1d9792d9cb72aae1e6f6c7b1d4.tar.bz2
Make hash_name_lookup able to do case-independent lookups
Right now nobody uses it, but "index_name_exists()" gets a flag so you can enable it on a case-by-case basis. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'name-hash.c')
-rw-r--r--name-hash.c50
1 files changed, 48 insertions, 2 deletions
diff --git a/name-hash.c b/name-hash.c
index 2678148..0031d78 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -8,12 +8,25 @@
#define NO_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
+/*
+ * This removes bit 5 if bit 6 is set.
+ *
+ * That will make US-ASCII characters hash to their upper-case
+ * equivalent. We could easily do this one whole word at a time,
+ * but that's for future worries.
+ */
+static inline unsigned char icase_hash(unsigned char c)
+{
+ return c & ~((c & 0x40) >> 1);
+}
+
static unsigned int hash_name(const char *name, int namelen)
{
unsigned int hash = 0x123;
do {
unsigned char c = *name++;
+ c = icase_hash(c);
hash = hash*101 + c;
} while (--namelen);
return hash;
@@ -54,7 +67,40 @@ void add_name_hash(struct index_state *istate, struct cache_entry *ce)
hash_index_entry(istate, ce);
}
-struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen)
+static int slow_same_name(const char *name1, int len1, const char *name2, int len2)
+{
+ if (len1 != len2)
+ return 0;
+
+ while (len1) {
+ unsigned char c1 = *name1++;
+ unsigned char c2 = *name2++;
+ len1--;
+ if (c1 != c2) {
+ c1 = toupper(c1);
+ c2 = toupper(c2);
+ if (c1 != c2)
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int same_name(const struct cache_entry *ce, const char *name, int namelen, int icase)
+{
+ int len = ce_namelen(ce);
+
+ /*
+ * Always do exact compare, even if we want a case-ignoring comparison;
+ * we do the quick exact one first, because it will be the common case.
+ */
+ if (len == namelen && !cache_name_compare(name, namelen, ce->name, len))
+ return 1;
+
+ return icase && slow_same_name(name, namelen, ce->name, len);
+}
+
+struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int icase)
{
unsigned int hash = hash_name(name, namelen);
struct cache_entry *ce;
@@ -64,7 +110,7 @@ struct cache_entry *index_name_exists(struct index_state *istate, const char *na
while (ce) {
if (!(ce->ce_flags & CE_UNHASHED)) {
- if (!cache_name_compare(name, namelen, ce->name, ce->ce_flags))
+ if (same_name(ce, name, namelen, icase))
return ce;
}
ce = ce->next;