Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "url.h"
   3
   4int 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
  19int 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
  32static 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
  51static char *url_decode_internal(const char **query, const char *stop_at,
  52                                 struct strbuf *out, int decode_plus)
  53{
  54        const char *q = *query;
  55
  56        do {
  57                unsigned char c = *q;
  58
  59                if (!c)
  60                        break;
  61                if (stop_at && strchr(stop_at, c)) {
  62                        q++;
  63                        break;
  64                }
  65
  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;
  72                        }
  73                }
  74
  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);
  83}
  84
  85char *url_decode(const char *url)
  86{
  87        struct strbuf out = STRBUF_INIT;
  88        const char *colon = strchr(url, ':');
  89
  90        /* Skip protocol part if present */
  91        if (colon && url < colon) {
  92                strbuf_add(&out, url, colon - url);
  93                url = colon;
  94        }
  95        return url_decode_internal(&url, NULL, &out, 0);
  96}
  97
  98char *url_decode_parameter_name(const char **query)
  99{
 100        struct strbuf out = STRBUF_INIT;
 101        return url_decode_internal(query, "&=", &out, 1);
 102}
 103
 104char *url_decode_parameter_value(const char **query)
 105{
 106        struct strbuf out = STRBUF_INIT;
 107        return url_decode_internal(query, "&", &out, 1);
 108}
 109
 110void end_url_with_slash(struct strbuf *buf, const char *url)
 111{
 112        strbuf_addstr(buf, url);
 113        if (buf->len && buf->buf[buf->len - 1] != '/')
 114                strbuf_addstr(buf, "/");
 115}
 116
 117void 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);
 122}