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tag: v1.7.2
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Octocat-spinner-32-eaf2f5

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#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, struct strbuf *out)
{
const char *q = *query;

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)
{
struct strbuf out = STRBUF_INIT;
const char *colon = strchr(url, ':');

/* Skip protocol part if present */
if (colon && url < colon) {
strbuf_add(&out, url, colon - url);
url = colon;
}
return url_decode_internal(&url, NULL, &out);
}

char *url_decode_parameter_name(const char **query)
{
struct strbuf out = STRBUF_INIT;
return url_decode_internal(query, "&=", &out);
}

char *url_decode_parameter_value(const char **query)
{
struct strbuf out = STRBUF_INIT;
return url_decode_internal(query, "&", &out);
}
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