utils/count/count.c

   1 /*===- count.c - The 'count' testing tool ---------------------------------===*\
   2  *
   3  *                     The LLVM Compiler Infrastructure
   4  *
   5  * This file is distributed under the University of Illinois Open Source
   6  * License. See LICENSE.TXT for details.
   7  *
   8 \*===----------------------------------------------------------------------===*/
   9
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12
  13 int main(int argc, char **argv) {
  14   unsigned Count, NumLines, NumRead;
  15   char Buffer[4096], *End;
  16
  17   if (argc != 2) {
  18     fprintf(stderr, "usage: %s <expected line count>\n", argv[0]);
  19     return 2;
  20   }
  21
  22   Count = strtol(argv[1], &End, 10);
  23   if (*End != '\0' && End != argv[1]) {
  24     fprintf(stderr, "%s: invalid count argument '%s'\n", argv[0], argv[1]);
  25     return 2;
  26   }
  27
  28   NumLines = 0;
  29   do {
  30     unsigned i;
  31
  32     NumRead = fread(Buffer, 1, sizeof(Buffer), stdin);
  33
  34     for (i = 0; i != NumRead; ++i)
  35       if (Buffer[i] == '\n')
  36         ++NumLines;
  37   } while (NumRead == sizeof(Buffer));
  38
  39   if (!feof(stdin)) {
  40     fprintf(stderr, "%s: error reading stdin\n", argv[0]);
  41     return 3;
  42   }
  43
  44   if (Count != NumLines) {
  45     fprintf(stderr, "Expected %d lines, got %d.\n", Count, NumLines);
  46     return 1;
  47   }
  48
  49   return 0;
  50 }