查找字符串数组中16进制数，并转换【原创】

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

void string_to_hex(unsigned char* input, int input_len, unsigned char* output, int output_len)
{
    unsigned char tmp;
    int i;

    if (input_len > output_len*2)
        return;

    for (i = 0; i < input_len; i += 2){
        tmp = input[i];
        if (tmp > '9'){
            tmp = (unsigned char)toupper((int)tmp) - 'A' + 0x0A;
        }
        else {
            tmp &= 0x0F;
        }
        output[i/2] = (tmp << 4);

        tmp = input[i+1];
        if (tmp > '9'){
            tmp = (unsigned char)toupper((int)tmp) - 'A' + 0x0A;
        }
        else {
            tmp &= 0x0F;
        }
        output[i/2] |= tmp;
    }
}

#define GTP_CONFIG_MAX_LENGTH       240

int main(void)
{
    char *fw_image = "0xfd,120x03fg  0x44 ,,0x56dff g0x23,,a0x34";
    int size = 0;
    int i = 0;
    char temp_data[GTP_CONFIG_MAX_LENGTH] = { 0 };
    char *endp = NULL;
    int find_data = 0;
    int j = 0;

    memset(temp_data, 0, strlen(temp_data));
    
    j = 0;
    size = strlen(fw_image);
    printf("size=%d \r\n", size);
    
    for (i = 0; i < size; i++) {
        if (fw_image[i] == '0' && find_data == 0) {
            find_data = 1;
            printf("[%d]%c find_data == 0 no\r\n", i, fw_image[i]);
            continue;
        }
        if ((fw_image[i] == 'x' || fw_image[i] == 'X') && find_data == 1) {
            find_data = 2;
            printf("[%d]%c find_data == 1 no\r\n", i, fw_image[i]);
        } else if (find_data == 2) {
            printf("[%d]%c find_data == 2\r\n", i, fw_image[i]);
            printf("[%d]%c find_data == 2\r\n", i, fw_image[i-2]);
            //temp_data[j] = strtoul(&fw_image[i-2], NULL, 16);
            string_to_hex(&fw_image[i], 2, &temp_data[j], 2);
            printf("temp_data[%d]=0x%02x yes\r\n", j, temp_data[j]);
            find_data = 0;
            j++;
        } else {
            find_data = 0;
            printf("[%d]%c find_data == 0 no\r\n", i, fw_image[i]);
        }
        
    }
    printf("j=%d \r\n", j);
    
    for (i = 0; i < j; i++) {
        printf("[%d]%02x ", i, temp_data[i] & 0xff);
        if (i % 10 == 9)
            printf("\n");
    }    
    
    #if 0
   // string_to_hex(buf, 5, tmp, 5); 
    tmp[0] = strtoul(buf, &endp, 16);
    tmp[1] = strtoul(&buf[5], &endp, 16);
    tmp[2] = strtoul(&buf[11], &endp, 16);
   
    for (i=0; i<5; i++)
        printf("tmp[%d]=%02x ", i, tmp[i]);
    #endif
    printf("\n");
    
    return 0;
}