utils/count/count.c

   1 /*===- count.c - The 'count' testing tool ---------------------------------===*\
   2  *
   3  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4  * See https://llvm.org/LICENSE.txt for license information.
   5  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6  *
   7 \*===----------------------------------------------------------------------===*/
   8
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11
  12 int main(int argc, char **argv) {
  13   unsigned Count, NumLines, NumRead;
  14   char Buffer[4096], *End;
  15
  16   if (argc != 2) {
  17     fprintf(stderr, "usage: %s <expected line count>\n", argv[0]);
  18     return 2;
  19   }
  20
  21   Count = strtol(argv[1], &End, 10);
  22   if (*End != '\0' && End != argv[1]) {
  23     fprintf(stderr, "%s: invalid count argument '%s'\n", argv[0], argv[1]);
  24     return 2;
  25   }
  26
  27   NumLines = 0;
  28   do {
  29     unsigned i;
  30
  31     NumRead = fread(Buffer, 1, sizeof(Buffer), stdin);
  32
  33     for (i = 0; i != NumRead; ++i)
  34       if (Buffer[i] == '\n')
  35         ++NumLines;
  36   } while (NumRead == sizeof(Buffer));
  37
  38   if (!feof(stdin)) {
  39     fprintf(stderr, "%s: error reading stdin\n", argv[0]);
  40     return 3;
  41   }
  42
  43   if (Count != NumLines) {
  44     fprintf(stderr, "Expected %d lines, got %d.\n", Count, NumLines);
  45     return 1;
  46   }
  47
  48   return 0;
  49 }