庫函數實現文件複製

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

int main(int argc, char *argv[])
{
    char *ptr;
    if (argc != 3)
    {
        printf("Usage: %s file1 file2\n", argv[0]);
        return 1;
    }

    FILE* fp1 = fopen(argv[1], "r+");
    if (NULL == fp1)
    {
        perror("fopen\n");
        fclose(fp1);
        return 2;
    }

    FILE* fp2 = fopen(argv[2], "w+");
    if (NULL == fp2)
    {
        perror("fopen\n");
        fclose(fp2);
        return 4;
    }

    char buffer[1024] = {0};
    int count = 0;
    while (count = fread(buffer, sizeof(char), 1024, fp1))
    {
        if (0 == count)
        {
            perror("fread\n");
            return 3;
        }
        ptr = buffer;
        int count2 = fwrite(ptr, sizeof(char), count, fp2);
        if (0 == count2)
        {
            perror("fwrite\n");
            return 5;
        }
    }
    fclose(fp1);
    fclose(fp2);

    return 0;
}