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  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include <errno.h>
  4. #include <stdlib.h>
  5. #include <sys/types.h>
  6. #include <sys/stat.h>
  7. #include <fcntl.h>
  8.  
  9. void
  10. cat(int f, char *s)
  11. {
  12.     char buf[8192];
  13.     long n;
  14.  
  15.     while((n=read(f, buf, (long)sizeof buf))>0)
  16.         if(write(1, buf, n)!=n)
  17.         {
  18.             printf("write error copying %s: %d\n", s, errno);
  19.             exit(1);
  20.         }
  21.     if(n < 0)
  22.     {
  23.         printf("error reading %s: %d\n", s, errno);
  24.         exit(1);
  25.     }
  26. }
  27.  
  28. int
  29. main(int argc, char *argv[])
  30. {
  31.     int f, i;
  32.  
  33.     if(argc == 1)
  34.         cat(0, "<stdin>");
  35.     else for(i=1; i<argc; i++){
  36.         f = open(argv[i], 0);
  37.         if(f < 0)
  38.         {
  39.             printf("can't open %s: %d\n", argv[i], errno);
  40.             exit(1);
  41.         }
  42.         else{
  43.             cat(f, argv[i]);
  44.             close(f);
  45.         }
  46.     }
  47.     exit(0);
  48. }
  49.  
  50.  
  51.  
Success #stdin #stdout 0s 1784KB
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https://ideone.com/IwUneC
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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