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-rw-r--r--git-compat-util.h23
-rw-r--r--strbuf.c22
2 files changed, 45 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h
index cedad4d581..68b2ad531e 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -485,6 +485,29 @@ static inline int skip_prefix(const char *str, const char *prefix,
}
/*
+ * If the string "str" is the same as the string in "prefix", then the "arg"
+ * parameter is set to the "def" parameter and 1 is returned.
+ * If the string "str" begins with the string found in "prefix" and then a
+ * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
+ * (i.e., to the point in the string right after the prefix and the "=" sign),
+ * and 1 is returned.
+ *
+ * Otherwise, return 0 and leave "arg" untouched.
+ *
+ * When we accept both a "--key" and a "--key=<val>" option, this function
+ * can be used instead of !strcmp(arg, "--key") and then
+ * skip_prefix(arg, "--key=", &arg) to parse such an option.
+ */
+int skip_to_optional_arg_default(const char *str, const char *prefix,
+ const char **arg, const char *def);
+
+static inline int skip_to_optional_arg(const char *str, const char *prefix,
+ const char **arg)
+{
+ return skip_to_optional_arg_default(str, prefix, arg, "");
+}
+
+/*
* Like skip_prefix, but promises never to read past "len" bytes of the input
* buffer, and returns the remaining number of bytes in "out" via "outlen".
*/
diff --git a/strbuf.c b/strbuf.c
index 323c49ceb3..29169b8ef8 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -11,6 +11,28 @@ int starts_with(const char *str, const char *prefix)
return 0;
}
+int skip_to_optional_arg_default(const char *str, const char *prefix,
+ const char **arg, const char *def)
+{
+ const char *p;
+
+ if (!skip_prefix(str, prefix, &p))
+ return 0;
+
+ if (!*p) {
+ if (arg)
+ *arg = def;
+ return 1;
+ }
+
+ if (*p != '=')
+ return 0;
+
+ if (arg)
+ *arg = p + 1;
+ return 1;
+}
+
/*
* Used as the default ->buf value, so that people can always assume
* buf is non NULL and ->buf is NUL terminated even for a freshly