Function web_url_encode

ds4_web.c:305–318

static char *web_json_get_string(const char *json, const char *key);

static char *web_url_encode(const char *s) {
    static const char hex[] = "0123456789ABCDEF";
    web_buf b = {0};
    for (const unsigned char *p = (const unsigned char *)s; p && *p; p++) {
        unsigned char c = *p;
        if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') {
            web_buf_append(&b, (const char *)&c, 1);
        } else {
            char e[3] = {'%', hex[c >> 4], hex[c & 15]};
            web_buf_append(&b, e, 3);
        }
    }
    return web_buf_take(&b);
}

static void web_random_bytes(unsigned char *buf, size_t len) {
    int fd = open("/dev/urandom", O_RDONLY);