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int urlencode (char * o, const char * i /* o must have at least strlen(i)*3+1 bytes of memory allocated */) {
size_t written = 0; /* o CANNOT be equal to i, unlike in urldecode */
for (; *i; i++) {
if (isalnum(*i) || *i == '.' || *i == '_' || *i == '-' || *i == '~') {
o[written++] = *i;
} else {
sprintf(o+written, "%%%02X", *i);
written += 3;
}
}
o[written++] = '\0';
return 1;
}
int urldecode (char * o, const char * i /* o must have at least strlen(i)+1 bytes memory allocated */) {
size_t written = 0; /* o can be equal to i for decoding in-place */
char buf[] = "00";
for (; *i; i++) {
if (*i == '%') {
buf[0] = *++i;
buf[1] = *++i;
if (!buf[0] || !buf[1]) { /* malformed */
o[written++] = '\0';
return 0;
}
o[written++] = strtol(buf, NULL, 16);
} else {
o[written++] = *i;
}
}
o[written++] = '\0';
return 1;
}
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