submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / url.c
blobe4262a0d7a9ef71924b117f4cbf9fe12d0239f0d
1 #include "cache.h"
2 #include "url.h"
4 int is_urlschemechar(int first_flag, int ch)
6 /*
7 * The set of valid URL schemes, as per STD66 (RFC3986) is
8 * '[A-Za-z][A-Za-z0-9+.-]*'. But use sightly looser check
9 * of '[A-Za-z0-9][A-Za-z0-9+.-]*' because earlier version
10 * of check used '[A-Za-z0-9]+' so not to break any remote
11 * helpers.
13 int alphanumeric, special;
14 alphanumeric = ch > 0 && isalnum(ch);
15 special = ch == '+' || ch == '-' || ch == '.';
16 return alphanumeric || (!first_flag && special);
19 int is_url(const char *url)
21 /* Is "scheme" part reasonable? */
22 if (!url || !is_urlschemechar(1, *url++))
23 return 0;
24 while (*url && *url != ':') {
25 if (!is_urlschemechar(0, *url++))
26 return 0;
28 /* We've seen "scheme"; we want colon-slash-slash */
29 return (url[0] == ':' && url[1] == '/' && url[2] == '/');
32 static int url_decode_char(const char *q)
34 int i;
35 unsigned char val = 0;
36 for (i = 0; i < 2; i++) {
37 unsigned char c = *q++;
38 val <<= 4;
39 if (c >= '0' && c <= '9')
40 val += c - '0';
41 else if (c >= 'a' && c <= 'f')
42 val += c - 'a' + 10;
43 else if (c >= 'A' && c <= 'F')
44 val += c - 'A' + 10;
45 else
46 return -1;
48 return val;
51 static char *url_decode_internal(const char **query, const char *stop_at,
52 struct strbuf *out, int decode_plus)
54 const char *q = *query;
56 do {
57 unsigned char c = *q;
59 if (!c)
60 break;
61 if (stop_at && strchr(stop_at, c)) {
62 q++;
63 break;
66 if (c == '%') {
67 int val = url_decode_char(q + 1);
68 if (0 <= val) {
69 strbuf_addch(out, val);
70 q += 3;
71 continue;
75 if (decode_plus && c == '+')
76 strbuf_addch(out, ' ');
77 else
78 strbuf_addch(out, c);
79 q++;
80 } while (1);
81 *query = q;
82 return strbuf_detach(out, NULL);
85 char *url_decode(const char *url)
87 struct strbuf out = STRBUF_INIT;
88 const char *colon = strchr(url, ':');
90 /* Skip protocol part if present */
91 if (colon && url < colon) {
92 strbuf_add(&out, url, colon - url);
93 url = colon;
95 return url_decode_internal(&url, NULL, &out, 0);
98 char *url_decode_parameter_name(const char **query)
100 struct strbuf out = STRBUF_INIT;
101 return url_decode_internal(query, "&=", &out, 1);
104 char *url_decode_parameter_value(const char **query)
106 struct strbuf out = STRBUF_INIT;
107 return url_decode_internal(query, "&", &out, 1);
110 void end_url_with_slash(struct strbuf *buf, const char *url)
112 strbuf_addstr(buf, url);
113 if (buf->len && buf->buf[buf->len - 1] != '/')
114 strbuf_addstr(buf, "/");
117 void str_end_url_with_slash(const char *url, char **dest) {
118 struct strbuf buf = STRBUF_INIT;
119 end_url_with_slash(&buf, url);
120 free(*dest);
121 *dest = strbuf_detach(&buf, NULL);