用c语言实现linux cat

话不多说，直接上代码：

#include <stdio.h>
void file_copy(FILE * file1,FILE * file2);
int main(int argc,char *argv[])
{
    FILE * fp;
    if(argc == 1)
        file_copy(stdin,stdout);
    else
        while(--argc > 0)
        {
            if((fp = fopen(*++argv,"r")) == NULL)
            {
                printf("no such file %s\n",*argv);
                return 1;
            }
            else
            {
                file_copy(fp,stdout);
                fclose(fp);
            }
        }
    return 0;
}
void file_copy(FILE * file1,FILE * file2)
{
    int c;  

    while((c = getc(file1)) != EOF)
    {
        putc(c,file2);
    }
}