return S_ISREG(buf.st_mode);
}
+static int isurlschemechar(int first_flag, int ch)
+{
+ /*
+ * The set of valid URL schemes, as per STD66 (RFC3986) is
+ * '[A-Za-z][A-Za-z0-9+.-]*'. But use sightly looser check
+ * of '[A-Za-z0-9][A-Za-z0-9+.-]*' because earlier version
+ * of check used '[A-Za-z0-9]+' so not to break any remote
+ * helpers.
+ */
+ int alphanumeric, special;
+ alphanumeric = ch > 0 && isalnum(ch);
+ special = ch == '+' || ch == '-' || ch == '.';
+ return alphanumeric || (!first_flag && special);
+}
+
static int is_url(const char *url)
{
const char *url2, *first_slash;
*/
url2 = url;
while (url2 < first_slash - 1) {
- if (!isalnum((unsigned char)*url2))
+ if (!isurlschemechar(url2 == url, (unsigned char)*url2))
return 0;
url2++;
}
if (url) {
const char *p = url;
- while (isalnum(*p))
+ while (isurlschemechar(p == url, *p))
p++;
if (!prefixcmp(p, "::"))
helper = xstrndup(url, p - url);