src/system/libroot/posix/glibc/stdio-common/perror.c

   1 /* Copyright (C) 1991-1993,1997,1998,2000-2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.
  18 */
  19
  20
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25
  26 /**     Print a line on stderr consisting of the text in \a s, a colon,
  27  *      a space, a message describing the meaning of the contents of
  28  *      `errno' and a newline.
  29  *      If \a s is NULL or "", the colon and space are omitted.
  30  */
  31
  32 void
  33 perror(const char *s)
  34 {
  35         const char *colon;
  36         char buffer[1024];
  37
  38         // ToDo: we should not change the orientation of the stream
  39         // (wide char support is currently disabled, so this doesn't matter yet)
  40
  41         if (s == NULL || *s == '\0')
  42                 s = colon = "";
  43         else
  44                 colon = ": ";
  45
  46         if (strerror_r(errno, buffer, sizeof(buffer)) != 0)
  47                 snprintf(buffer, sizeof(buffer), "Unknown error %d", errno);
  48
  49         fprintf(stderr, "%s%s%s\n", s, colon, buffer);
  50 }
  51