tests/test-getline.c

   1 /* Test of getline() function.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Eric Blake <ebb9@byu.net>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <stdio.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (getline, ssize_t, (char **, size_t *, FILE *));
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "macros.h"
  30
  31 int
  32 main (void)
  33 {
  34   FILE *f;
  35   char *line;
  36   size_t len;
  37   ssize_t result;
  38
  39   /* Create test file.  */
  40   f = fopen ("test-getline.txt", "wb");
  41   if (!f || fwrite ("a\nA\nbc\nd\0f", 1, 10, f) != 10 || fclose (f) != 0)
  42     {
  43       fputs ("Failed to create sample file.\n", stderr);
  44       remove ("test-getline.txt");
  45       return 1;
  46     }
  47   f = fopen ("test-getline.txt", "rb");
  48   if (!f)
  49     {
  50       fputs ("Failed to reopen sample file.\n", stderr);
  51       remove ("test-getline.txt");
  52       return 1;
  53     }
  54
  55   /* Test initial allocation, which must include trailing NUL.  */
  56   line = NULL;
  57   len = 0;
  58   result = getline (&line, &len, f);
  59   ASSERT (result == 2);
  60   ASSERT (strcmp (line, "a\n") == 0);
  61   ASSERT (2 < len);
  62   free (line);
  63
  64   /* Test initial allocation again, with line = NULL and len != 0.  */
  65   line = NULL;
  66   len = (size_t)(~0) / 4;
  67   result = getline (&line, &len, f);
  68   ASSERT (result == 2);
  69   ASSERT (strcmp (line, "A\n") == 0);
  70   ASSERT (2 < len);
  71   free (line);
  72
  73   /* Test growth of buffer, must not leak.  */
  74   len = 1;
  75   line = malloc (len);
  76   result = getline (&line, &len, f);
  77   ASSERT (result == 3);
  78   ASSERT (strcmp (line, "bc\n") == 0);
  79   ASSERT (3 < len);
  80
  81   /* Test embedded NULs and EOF behavior.  */
  82   result = getline (&line, &len, f);
  83   ASSERT (result == 3);
  84   ASSERT (memcmp (line, "d\0f", 4) == 0);
  85   ASSERT (3 < len);
  86
  87   result = getline (&line, &len, f);
  88   ASSERT (result == -1);
  89
  90   free (line);
  91   fclose (f);
  92   remove ("test-getline.txt");
  93   return test_exit_status;
  94 }