linux c url 解码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

void url_decode(char *str) {
    char *dest = str;
    char *data = str;

    while (*data) {
        if (*data == '%') {
            if (isxdigit(*(data + 1)) && isxdigit(*(data + 2))) {
                *dest++ = (char)strtol(data + 1, NULL, 16);
                data += 3;
            } else {
                *dest++ = *data++;
            }
        } else if (*data == '+') {
            *dest++ = ' ';
            data++;
        } else {
            *dest++ = *data++;
        }
    }
    *dest = '\0';
}

int main() {
    char url[] = "https%3A%2F%2Fexample.com%2Fsearch%3Fq%3Dhello%2Bworld";
    printf("Original URL: %s\n", url);
    url_decode(url);
    printf("Decoded URL: %s\n", url);
    return 0;
}