support/xgetline.c

   1 /* fopen with error checking.
   2    Copyright (C) 2020-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/xstdio.h>
  20 #include <support/check.h>
  21
  22 size_t
  23 xgetline (char **lineptr, size_t *n, FILE *stream)
  24 {
  25   TEST_VERIFY (!ferror (stream));
  26   ssize_t ret = getline (lineptr, n, stream);
  27   if (ferror (stream))
  28     {
  29       TEST_VERIFY (ret < 0);
  30       FAIL_EXIT1 ("getline: %m");
  31     }
  32   if (feof (stream))
  33     {
  34       TEST_VERIFY (ret <= 0);
  35       return 0;
  36     }
  37   TEST_VERIFY (ret > 0);
  38   return ret;
  39 }