Merge branch 'esr/maint-doc-fast-import'
[git.git] / url.c
blob335d97d3f74e5b7d7139e223fbe1d19837a72e81
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, int len,
52 const char *stop_at, struct strbuf *out,
53 int decode_plus)
55 const char *q = *query;
57 while (len) {
58 unsigned char c = *q;
60 if (!c)
61 break;
62 if (stop_at && strchr(stop_at, c)) {
63 q++;
64 len--;
65 break;
68 if (c == '%') {
69 int val = url_decode_char(q + 1);
70 if (0 <= val) {
71 strbuf_addch(out, val);
72 q += 3;
73 len -= 3;
74 continue;
78 if (decode_plus && c == '+')
79 strbuf_addch(out, ' ');
80 else
81 strbuf_addch(out, c);
82 q++;
83 len--;
85 *query = q;
86 return strbuf_detach(out, NULL);
89 char *url_decode(const char *url)
91 return url_decode_mem(url, strlen(url));
94 char *url_decode_mem(const char *url, int len)
96 struct strbuf out = STRBUF_INIT;
97 const char *colon = memchr(url, ':', len);
99 /* Skip protocol part if present */
100 if (colon && url < colon) {
101 strbuf_add(&out, url, colon - url);
102 len -= colon - url;
103 url = colon;
105 return url_decode_internal(&url, len, NULL, &out, 0);
108 char *url_decode_parameter_name(const char **query)
110 struct strbuf out = STRBUF_INIT;
111 return url_decode_internal(query, -1, "&=", &out, 1);
114 char *url_decode_parameter_value(const char **query)
116 struct strbuf out = STRBUF_INIT;
117 return url_decode_internal(query, -1, "&", &out, 1);
120 void end_url_with_slash(struct strbuf *buf, const char *url)
122 strbuf_addstr(buf, url);
123 if (buf->len && buf->buf[buf->len - 1] != '/')
124 strbuf_addstr(buf, "/");
127 void str_end_url_with_slash(const char *url, char **dest) {
128 struct strbuf buf = STRBUF_INIT;
129 end_url_with_slash(&buf, url);
130 free(*dest);
131 *dest = strbuf_detach(&buf, NULL);