refs.c: make prune_ref use a transaction to delete the ref
[git] / url.c
1 #include "cache.h"
2 #include "url.h"
3
4 int is_urlschemechar(int first_flag, int ch)
5 {
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.
12          */
13         int alphanumeric, special;
14         alphanumeric = ch > 0 && isalnum(ch);
15         special = ch == '+' || ch == '-' || ch == '.';
16         return alphanumeric || (!first_flag && special);
17 }
18
19 int is_url(const char *url)
20 {
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;
27         }
28         /* We've seen "scheme"; we want colon-slash-slash */
29         return (url[0] == ':' && url[1] == '/' && url[2] == '/');
30 }
31
32 static int url_decode_char(const char *q)
33 {
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;
47         }
48         return val;
49 }
50
51 static char *url_decode_internal(const char **query, int len,
52                                  const char *stop_at, struct strbuf *out,
53                                  int decode_plus)
54 {
55         const char *q = *query;
56
57         while (len) {
58                 unsigned char c = *q;
59
60                 if (!c)
61                         break;
62                 if (stop_at && strchr(stop_at, c)) {
63                         q++;
64                         len--;
65                         break;
66                 }
67
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;
75                         }
76                 }
77
78                 if (decode_plus && c == '+')
79                         strbuf_addch(out, ' ');
80                 else
81                         strbuf_addch(out, c);
82                 q++;
83                 len--;
84         }
85         *query = q;
86         return strbuf_detach(out, NULL);
87 }
88
89 char *url_decode(const char *url)
90 {
91         return url_decode_mem(url, strlen(url));
92 }
93
94 char *url_decode_mem(const char *url, int len)
95 {
96         struct strbuf out = STRBUF_INIT;
97         const char *colon = memchr(url, ':', len);
98
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;
104         }
105         return url_decode_internal(&url, len, NULL, &out, 0);
106 }
107
108 char *url_decode_parameter_name(const char **query)
109 {
110         struct strbuf out = STRBUF_INIT;
111         return url_decode_internal(query, -1, "&=", &out, 1);
112 }
113
114 char *url_decode_parameter_value(const char **query)
115 {
116         struct strbuf out = STRBUF_INIT;
117         return url_decode_internal(query, -1, "&", &out, 1);
118 }
119
120 void end_url_with_slash(struct strbuf *buf, const char *url)
121 {
122         strbuf_addstr(buf, url);
123         if (buf->len && buf->buf[buf->len - 1] != '/')
124                 strbuf_addstr(buf, "/");
125 }
126
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);
132 }