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127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
#include "cache.h"
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int is_urlschemechar(int first_flag, int ch)
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{
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/*
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* The set of valid URL schemes, as per STD66 (RFC3986) is
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* '[A-Za-z][A-Za-z0-9+.-]*'. But use sightly looser check
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* of '[A-Za-z0-9][A-Za-z0-9+.-]*' because earlier version
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* of check used '[A-Za-z0-9]+' so not to break any remote
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* helpers.
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*/
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int alphanumeric, special;
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alphanumeric = ch > 0 && isalnum(ch);
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special = ch == '+' || ch == '-' || ch == '.';
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return alphanumeric || (!first_flag && special);
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}
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int is_url(const char *url)
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{
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const char *url2, *first_slash;
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if (!url)
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return 0;
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url2 = url;
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first_slash = strchr(url, '/');
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/* Input with no slash at all or slash first can't be URL. */
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if (!first_slash || first_slash == url)
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return 0;
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/* Character before must be : and next must be /. */
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if (first_slash[-1] != ':' || first_slash[1] != '/')
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return 0;
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/* There must be something before the :// */
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if (first_slash == url + 1)
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return 0;
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/*
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* Check all characters up to first slash - 1. Only alphanum
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* is allowed.
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*/
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url2 = url;
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while (url2 < first_slash - 1) {
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if (!is_urlschemechar(url2 == url, (unsigned char)*url2))
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return 0;
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url2++;
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}
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/* Valid enough. */
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return 1;
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}
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static int url_decode_char(const char *q)
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{
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int i;
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unsigned char val = 0;
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for (i = 0; i < 2; i++) {
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unsigned char c = *q++;
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val <<= 4;
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if (c >= '0' && c <= '9')
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val += c - '0';
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else if (c >= 'a' && c <= 'f')
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val += c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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val += c - 'A' + 10;
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else
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return -1;
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}
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return val;
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}
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static char *url_decode_internal(const char **query, const char *stop_at, struct strbuf *out)
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{
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const char *q = *query;
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do {
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unsigned char c = *q;
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if (!c)
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break;
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if (stop_at && strchr(stop_at, c)) {
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q++;
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break;
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}
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if (c == '%') {
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int val = url_decode_char(q + 1);
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if (0 <= val) {
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strbuf_addch(out, val);
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q += 3;
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continue;
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}
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}
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if (c == '+')
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strbuf_addch(out, ' ');
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else
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strbuf_addch(out, c);
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q++;
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} while (1);
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*query = q;
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return strbuf_detach(out, NULL);
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}
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char *url_decode(const char *url)
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{
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struct strbuf out = STRBUF_INIT;
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const char *colon = strchr(url, ':');
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/* Skip protocol part if present */
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if (colon && url < colon) {
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strbuf_add(&out, url, colon - url);
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url = colon;
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}
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return url_decode_internal(&url, NULL, &out);
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}
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char *url_decode_parameter_name(const char **query)
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{
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struct strbuf out = STRBUF_INIT;
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return url_decode_internal(query, "&=", &out);
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}
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char *url_decode_parameter_value(const char **query)
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{
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struct strbuf out = STRBUF_INIT;
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return url_decode_internal(query, "&", &out);
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}
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