51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stdio.h>
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#include <errno.h>
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#ifndef HAVE_GNU_LD
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#define _sys_errlist sys_errlist
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#define _sys_nerr sys_nerr
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#endif
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/* Defined in sys_errlist.c. */
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extern CONST char *CONST _sys_errlist[];
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extern CONST int _sys_nerr;
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/* Print a line on stderr consisting of the text in S, a colon, a space,
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a message describing the meaning of the contents of `errno' and a newline.
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If S is NULL or "", the colon and space are omitted. */
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void
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DEFUN(perror, (s), register CONST char *s)
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{
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int errnum = errno;
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CONST char *colon;
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if (s == NULL || *s == '\0')
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s = colon = "";
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else
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colon = ": ";
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if (errnum >= 0 && errnum < _sys_nerr)
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(void) fprintf(stderr, "%s%s%s\n", s, colon, _sys_errlist[errnum]);
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else
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(void) fprintf(stderr, "%s%sUnknown error %d\n", s, colon, errnum);
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}
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