c语言版统计文件比对率的demo 没技术含量 存档用

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

int main(int argc, char *argv[])

{

    printf("%s running\n", argv[0]);

    if(argc != 3)

    {

        printf("usage:%s <file1> <file2>\n", argv[0]);

        return 1;

    }

    char *file0 = argv[1];

    char *file1 = argv[2];

    FILE *fp0, *fp1;

    fp0 = fopen(file0, "r");

    if(fp0 == NULL)

    {

        printf("can't open %s\n", file0);

        return 1;

    }

    fp1 = fopen(file1, "r");

    if(fp1 == NULL)

    {

        printf("can't open %s\n", file1);

        return 1;

    }

    //////////////////////////////////////////

    fseek(fp0, 0L, SEEK_END);

    int fp0_size = ftell(fp0);

    fseek(fp0, 0L, SEEK_SET);

    fseek(fp1, 0L, SEEK_END);

    int fp1_size = ftell(fp1);

    fseek(fp1, 0L, SEEK_SET);

    if(fp0_size != fp1_size)

    {

        printf("file1 size != file2 size\n");

        return 1;

    }

    //////////////////////////////////////////

    uint8_t *fp0_buf = (uint8_t *)malloc(fp0_size);

    uint8_t *fp1_buf = (uint8_t *)malloc(fp1_size);

    fread(fp0_buf, fp0_size, 1, fp0);

    fclose(fp0);

    fread(fp1_buf, fp1_size, 1, fp1);

    fclose(fp1);

    int notmatch = 0;

    int grater1  = 0;

    int grater2  = 0;

    int less1    = 0;

    int less2    = 0;

    int other    = 0;

    for(int i = 0; i < fp0_size; i++)

    {

        if(fp1_buf[i] != fp0_buf[i])

        {

            notmatch++;

            if(fp1_buf[i] == fp0_buf[i] + 1)

            {

                grater1++;

            } else if(fp1_buf[i] == fp0_buf[i] + 2)

            {

                grater2++;

            } else if(fp1_buf[i] == fp0_buf[i] - 1)

            {

                less1++;

            } else if(fp1_buf[i] == fp0_buf[i] - 2)

            {

                less2++;

            } else

            {

                other++;

            }

        }

    }

    printf("notmatch =%f%%\n", (float)notmatch * 100 / fp0_size);

    printf("grater1 =%f%%\n", (float)grater1 * 100 / fp0_size);

    printf("grater2 =%f%%\n", (float)grater2 * 100 / fp0_size);

    printf("less1 =%f%%\n", (float)less1 * 100 / fp0_size);

    printf("less2 =%f%%\n", (float)less2 * 100 / fp0_size);

    printf("other =%f%%\n", (float)other * 100 / fp0_size);

    return 0;

}