学步园

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




/*
  实现了cat的查看文件和合并文件的功能
*/


void file_copy(FILE *inFile, FILE *outFile)
{
    int c=0;
    while((c=getc(inFile)) != EOF)
        putc(c, outFile);
}

int main(int argc, char *argv[])
{
    FILE *fp;
    FILE *fp2;
    
    if(argc == 3) //两个参数为合并文件功能
    {
        if( ((fp = fopen(argv[1], "r")) != NULL) && ((fp2 = fopen(argv[2], "a")) != NULL) )
	{
  	   file_copy(fp, fp2);
   	   fclose(fp);
  	   fclose(fp2);
	}
    }
   
   else if(argc == 2) //一个参数为查看文件功能
   {
       while(--argc > 0)
       {
         if ((fp=fopen(*++argv, "r")) == NULL)
         {
            printf("Can't open file\n");
            return 1;
         }
         else
         {
            file_copy(fp, stdout);
            fclose(fp);
         }
      }

   }

   else
   {
   	 printf("参数个数有误\n");
   }
    return 0;
}