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-rw-r--r--url.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/url.c b/url.c
new file mode 100644
index 0000000000..eaf4f07081
--- /dev/null
+++ b/url.c
@@ -0,0 +1,112 @@
+#include "cache.h"
+#include "url.h"
+
+int is_urlschemechar(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);
+}
+
+int is_url(const char *url)
+{
+ /* Is "scheme" part reasonable? */
+ if (!url || !is_urlschemechar(1, *url++))
+ return 0;
+ while (*url && *url != ':') {
+ if (!is_urlschemechar(0, *url++))
+ return 0;
+ }
+ /* We've seen "scheme"; we want colon-slash-slash */
+ return (url[0] == ':' && url[1] == '/' && url[2] == '/');
+}
+
+static char *url_decode_internal(const char **query, int len,
+ const char *stop_at, struct strbuf *out,
+ int decode_plus)
+{
+ const char *q = *query;
+
+ while (len) {
+ unsigned char c = *q;
+
+ if (!c)
+ break;
+ if (stop_at && strchr(stop_at, c)) {
+ q++;
+ len--;
+ break;
+ }
+
+ if (c == '%') {
+ int val = hex2chr(q + 1);
+ if (0 <= val) {
+ strbuf_addch(out, val);
+ q += 3;
+ len -= 3;
+ continue;
+ }
+ }
+
+ if (decode_plus && c == '+')
+ strbuf_addch(out, ' ');
+ else
+ strbuf_addch(out, c);
+ q++;
+ len--;
+ }
+ *query = q;
+ return strbuf_detach(out, NULL);
+}
+
+char *url_decode(const char *url)
+{
+ return url_decode_mem(url, strlen(url));
+}
+
+char *url_decode_mem(const char *url, int len)
+{
+ struct strbuf out = STRBUF_INIT;
+ const char *colon = memchr(url, ':', len);
+
+ /* Skip protocol part if present */
+ if (colon && url < colon) {
+ strbuf_add(&out, url, colon - url);
+ len -= colon - url;
+ url = colon;
+ }
+ return url_decode_internal(&url, len, NULL, &out, 0);
+}
+
+char *url_decode_parameter_name(const char **query)
+{
+ struct strbuf out = STRBUF_INIT;
+ return url_decode_internal(query, -1, "&=", &out, 1);
+}
+
+char *url_decode_parameter_value(const char **query)
+{
+ struct strbuf out = STRBUF_INIT;
+ return url_decode_internal(query, -1, "&", &out, 1);
+}
+
+void end_url_with_slash(struct strbuf *buf, const char *url)
+{
+ strbuf_addstr(buf, url);
+ strbuf_complete(buf, '/');
+}
+
+void str_end_url_with_slash(const char *url, char **dest) {
+ struct strbuf buf = STRBUF_INIT;
+ end_url_with_slash(&buf, url);
+ free(*dest);
+ *dest = strbuf_detach(&buf, NULL);
+}