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authorJeff King <peff@peff.net>2010-05-23 09:17:55 (GMT)
committerJunio C Hamano <gitster@pobox.com>2010-05-24 23:48:32 (GMT)
commit638794cde08bb785410a92d293969949a1f5a846 (patch)
tree0c17c4e6be9ee58704a1b6a981fef7fbf4e7d17b /url.c
parent770c54170a43ffb3810088a85f25c59c0cbf7b38 (diff)
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make url-related functions reusable
The is_url function and url percent-decoding functions were static, but are generally useful. Let's make them available to other parts of the code. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'url.c')
-rw-r--r--url.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/url.c b/url.c
new file mode 100644
index 0000000..cd32b92
--- /dev/null
+++ b/url.c
@@ -0,0 +1,118 @@
+#include "cache.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)
+{
+ const char *url2, *first_slash;
+
+ if (!url)
+ return 0;
+ url2 = url;
+ first_slash = strchr(url, '/');
+
+ /* Input with no slash at all or slash first can't be URL. */
+ if (!first_slash || first_slash == url)
+ return 0;
+ /* Character before must be : and next must be /. */
+ if (first_slash[-1] != ':' || first_slash[1] != '/')
+ return 0;
+ /* There must be something before the :// */
+ if (first_slash == url + 1)
+ return 0;
+ /*
+ * Check all characters up to first slash - 1. Only alphanum
+ * is allowed.
+ */
+ url2 = url;
+ while (url2 < first_slash - 1) {
+ if (!is_urlschemechar(url2 == url, (unsigned char)*url2))
+ return 0;
+ url2++;
+ }
+
+ /* Valid enough. */
+ return 1;
+}
+
+static int url_decode_char(const char *q)
+{
+ int i;
+ unsigned char val = 0;
+ for (i = 0; i < 2; i++) {
+ unsigned char c = *q++;
+ val <<= 4;
+ if (c >= '0' && c <= '9')
+ val += c - '0';
+ else if (c >= 'a' && c <= 'f')
+ val += c - 'a' + 10;
+ else if (c >= 'A' && c <= 'F')
+ val += c - 'A' + 10;
+ else
+ return -1;
+ }
+ return val;
+}
+
+static char *url_decode_internal(const char **query, const char *stop_at)
+{
+ const char *q = *query;
+ struct strbuf out;
+
+ strbuf_init(&out, 16);
+ do {
+ unsigned char c = *q;
+
+ if (!c)
+ break;
+ if (stop_at && strchr(stop_at, c)) {
+ q++;
+ break;
+ }
+
+ if (c == '%') {
+ int val = url_decode_char(q + 1);
+ if (0 <= val) {
+ strbuf_addch(&out, val);
+ q += 3;
+ continue;
+ }
+ }
+
+ if (c == '+')
+ strbuf_addch(&out, ' ');
+ else
+ strbuf_addch(&out, c);
+ q++;
+ } while (1);
+ *query = q;
+ return strbuf_detach(&out, NULL);
+}
+
+char *url_decode(const char *url)
+{
+ return url_decode_internal(&url, NULL);
+}
+
+char *url_decode_parameter_name(const char **query)
+{
+ return url_decode_internal(query, "&=");
+}
+
+char *url_decode_parameter_value(const char **query)
+{
+ return url_decode_internal(query, "&");
+}