llvm/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 "llvm/Support/AutoConvert.h"
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12
  13 int main(int argc, char **argv) {
  14 #ifdef __MVS__
  15   if (enableAutoConversion(fileno(stdin)) == -1)
  16     fprintf(stderr, "Setting conversion on stdin failed\n");
  17
  18   if (enableAutoConversion(fileno(stderr)) == -1)
  19     fprintf(stdout, "Setting conversion on stderr failed\n");
  20 #endif
  21   size_t Count, NumLines, NumRead;
  22   char Buffer[4096], *End;
  23
  24   if (argc != 2) {
  25     fprintf(stderr, "usage: %s <expected line count>\n", argv[0]);
  26     return 2;
  27   }
  28
  29   Count = strtoul(argv[1], &End, 10);
  30   if (*End != '\0' && End != argv[1]) {
  31     fprintf(stderr, "%s: invalid count argument '%s'\n", argv[0], argv[1]);
  32     return 2;
  33   }
  34
  35   NumLines = 0;
  36   do {
  37     size_t i;
  38
  39     NumRead = fread(Buffer, 1, sizeof(Buffer), stdin);
  40
  41     for (i = 0; i != NumRead; ++i)
  42       if (Buffer[i] == '\n')
  43         ++NumLines;
  44   } while (NumRead == sizeof(Buffer));
  45
  46   if (!feof(stdin)) {
  47     fprintf(stderr, "%s: error reading stdin\n", argv[0]);
  48     return 3;
  49   }
  50
  51   if (Count != NumLines) {
  52     fprintf(stderr, "Expected %zu lines, got %zu.\n", Count, NumLines);
  53     return 1;
  54   }
  55
  56   return 0;
  57 }