config: add helper function for parsing key names

[thirdparty/git.git] / config.c

diff --git a/config.c b/config.c
index 7b444b68abcebb5829a5628ee5b74cf3f0020c0b..11bd4d8058532b91eea2dcd5264497d4949557bd 100644 (file)
--- a/config.c
+++ b/config.c
@@ -1667,3 +1667,36 @@ int config_error_nonbool(const char *var)
 {
        return error("Missing value for '%s'", var);
 }
+
+int parse_config_key(const char *var,
+                    const char *section,
+                    const char **subsection, int *subsection_len,
+                    const char **key)
+{
+       int section_len = strlen(section);
+       const char *dot;
+
+       /* Does it start with "section." ? */
+       if (prefixcmp(var, section) || var[section_len] != '.')
+               return -1;
+
+       /*
+        * Find the key; we don't know yet if we have a subsection, but we must
+        * parse backwards from the end, since the subsection may have dots in
+        * it, too.
+        */
+       dot = strrchr(var, '.');
+       *key = dot + 1;
+
+       /* Did we have a subsection at all? */
+       if (dot == var + section_len) {
+               *subsection = NULL;
+               *subsection_len = 0;
+       }
+       else {
+               *subsection = var + section_len + 1;
+               *subsection_len = dot - *subsection;
+       }
+
+       return 0;
+}