Create internal strcmp variants for function ptrs

Using the builtin strcmp and strcasecmp as function pointers is
problematic on win32.  This adds internal implementations and
divorces us from the platform linkage.

1 files changed, 30 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
index 7f5043817..3a08d4554 100644
--- a/src/util.c
+++ b/src/util.c
@@ -174,6 +174,36 @@ int git__strtol32(int32_t *result, const char *nptr, const char **endptr, int ba
 	return error;
 }
 
+int git__strcmp(const char *a, const char *b)
+{
+	while (*a && *b && *a == *b)
+		++a, ++b;
+	return (int)(*(const unsigned char *)a) - (int)(*(const unsigned char *)b);
+}
+
+int git__strcasecmp(const char *a, const char *b)
+{
+	while (*a && *b && tolower(*a) == tolower(*b))
+		++a, ++b;
+	return (tolower(*a) - tolower(*b));
+}
+
+int git__strncmp(const char *a, const char *b, size_t sz)
+{
+	while (sz && *a && *b && *a == *b)
+		--sz, ++a, ++b;
+	if (!sz)
+		return 0;
+	return (int)(*(const unsigned char *)a) - (int)(*(const unsigned char *)b);
+}
+
+int git__strncasecmp(const char *a, const char *b, size_t sz)
+{
+	while (sz && *a && *b && tolower(*a) == tolower(*b))
+		--sz, ++a, ++b;
+	return !sz ? 0 : (tolower(*a) - tolower(*b));
+}
+
 void git__strntolower(char *str, size_t len)
 {
 	size_t i;