git

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#include "git-compat-util.h"
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#include "hex-ll.h"
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#include "strbuf.h"
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#include "url.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 slightly 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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	/* Is "scheme" part reasonable? */
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	if (!url || !is_urlschemechar(1, *url++))
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		return 0;
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	while (*url && *url != ':') {
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		if (!is_urlschemechar(0, *url++))
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			return 0;
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	}
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	/* We've seen "scheme"; we want colon-slash-slash */
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	return (url[0] == ':' && url[1] == '/' && url[2] == '/');
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}
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static char *url_decode_internal(const char **query, int len,
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				 const char *stop_at, struct strbuf *out,
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				 int decode_plus)
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{
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	const char *q = *query;
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	while (len) {
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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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			len--;
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			break;
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		}
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		if (c == '%' && (len < 0 || len >= 3)) {
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			int val = hex2chr(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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				len -= 3;
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				continue;
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			}
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		}
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		if (decode_plus && 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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		len--;
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	}
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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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	return url_decode_mem(url, strlen(url));
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}
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char *url_decode_mem(const char *url, int len)
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{
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	struct strbuf out = STRBUF_INIT;
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	const char *colon = memchr(url, ':', len);
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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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		len -= colon - url;
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		url = colon;
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	}
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	return url_decode_internal(&url, len, NULL, &out, 0);
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}
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char *url_percent_decode(const char *encoded)
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{
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	struct strbuf out = STRBUF_INIT;
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	return url_decode_internal(&encoded, strlen(encoded), NULL, &out, 0);
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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, -1, "&=", &out, 1);
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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, -1, "&", &out, 1);
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}
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void end_url_with_slash(struct strbuf *buf, const char *url)
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{
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	strbuf_addstr(buf, url);
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	strbuf_complete(buf, '/');
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}
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void str_end_url_with_slash(const char *url, char **dest)
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{
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	struct strbuf buf = STRBUF_INIT;
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	end_url_with_slash(&buf, url);
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	free(*dest);
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	*dest = strbuf_detach(&buf, NULL);
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}
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