ANSI C实现文件长度读取

ANSI C实现文件长度读取

#include <stdio.h>

long fsize(FILE *fp)
{
    long cur, size;
   
    cur = ftell(fp);
    fseek(fp, 0, SEEK_END);
    size = ftell(fp);
    fseek(fp, cur, SEEK_SET);
    return size;
}

int main(void)
{
    FILE *fp;
   
    fp = fopen("test.c","r");
    printf("size = %ldn", fsize(fp));
    fclose(fp);
   
    getchar();
    return 0;
}