diff options
Diffstat (limited to 'api/c/urlcode.c')
-rw-r--r-- | api/c/urlcode.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/api/c/urlcode.c b/api/c/urlcode.c new file mode 100644 index 0000000..ecf34e1 --- /dev/null +++ b/api/c/urlcode.c @@ -0,0 +1,48 @@ +/* Converts a hex character to its integer value */ +char from_hex(char ch) { + return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10; +} + +/* Converts an integer value to its hex character*/ +char to_hex(char code) { + static char hex[] = "0123456789abcdef"; + return hex[code & 15]; +} + +/* Returns a url-encoded version of str */ +/* IMPORTANT: be sure to free() the returned string after use */ +char *url_encode(char *str) { + char *pstr = str, *buf = malloc(strlen(str) * 3 + 1), *pbuf = buf; + while (*pstr) { + if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~') + *pbuf++ = *pstr; + else if (*pstr == ' ') + *pbuf++ = '+'; + else + *pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(*pstr & 15); + pstr++; + } + *pbuf = '\0'; + return buf; +} + +/* Returns a url-decoded version of str */ +/* IMPORTANT: be sure to free() the returned string after use */ +char *url_decode(char *str) { + char *pstr = str, *buf = malloc(strlen(str) + 1), *pbuf = buf; + while (*pstr) { + if (*pstr == '%') { + if (pstr[1] && pstr[2]) { + *pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]); + pstr += 2; + } + } else if (*pstr == '+') { + *pbuf++ = ' '; + } else { + *pbuf++ = *pstr; + } + pstr++; + } + *pbuf = '\0'; + return buf; +} |