get-tar-commit-id.c

   1 /*
   2  * Copyright (C) 2005 Rene Scharfe
   3  */
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 #define HEADERSIZE      1024
   9
  10 int main(int argc, char **argv)
  11 {
  12         char buffer[HEADERSIZE];
  13         ssize_t n;
  14
  15         n = read(0, buffer, HEADERSIZE);
  16         if (n < HEADERSIZE) {
  17                 fprintf(stderr, "read error\n");
  18                 return 3;
  19         }
  20         if (buffer[156] != 'g')
  21                 return 1;
  22         if (memcmp(&buffer[512], "52 comment=", 11))
  23                 return 1;
  24         n = write(1, &buffer[523], 41);
  25         if (n < 41) {
  26                 fprintf(stderr, "write error\n");
  27                 return 2;
  28         }
  29         return 0;
  30 }