xref: /llvm-project/llvm/utils/count/count.c (revision 311ac6381649fa0f7cc495db8fa697d6a9b43988)
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 (enablezOSAutoConversion(fileno(stdin)) == -1)
16     fprintf(stderr, "Setting conversion on stdin failed\n");
17 
18   if (enablezOSAutoConversion(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 }
58