submodule.c: report the submodule that an error occurs in

diff --git a/git-compat-util.h b/git-compat-util.h
index 68b2ad531ea6f9cf1127a0e5986c523fd86b0967..fc87cbb0904541099a6aa6bd656b70e225778695 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1001,6 +1001,23 @@ static inline int sane_iscase(int x, int is_lower)
                return (x & 0x20) == 0;
 }
 
+/*
+ * Like skip_prefix, but compare case-insensitively. Note that the comparison
+ * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
+ * locale-specific conversions).
+ */
+static inline int skip_iprefix(const char *str, const char *prefix,
+                              const char **out)
+{
+       do {
+               if (!*prefix) {
+                       *out = str;
+                       return 1;
+               }
+       } while (tolower(*str++) == tolower(*prefix++));
+       return 0;
+}
+
 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 {
        unsigned long ul;