112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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FUNCTION
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<<perror>>---print an error message on standard error
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INDEX
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perror
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INDEX
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_perror_r
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SYNOPSIS
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#include <stdio.h>
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void perror(char *<[prefix]>);
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void _perror_r(struct _reent *<[reent]>, char *<[prefix]>);
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DESCRIPTION
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Use <<perror>> to print (on standard error) an error message
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corresponding to the current value of the global variable <<errno>>.
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Unless you use <<NULL>> as the value of the argument <[prefix]>, the
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error message will begin with the string at <[prefix]>, followed by a
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colon and a space (<<: >>). The remainder of the error message is one
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of the strings described for <<strerror>>.
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The alternate function <<_perror_r>> is a reentrant version. The
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extra argument <[reent]> is a pointer to a reentrancy structure.
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RETURNS
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<<perror>> returns no result.
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PORTABILITY
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ANSI C requires <<perror>>, but the strings issued vary from one
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implementation to another.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/uio.h>
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#include "local.h"
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#define ADD(str) \
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{ \
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v->iov_base = (void *)(str); \
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v->iov_len = strlen (v->iov_base); \
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v ++; \
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iov_cnt ++; \
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}
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void
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_perror_r (struct _reent *ptr,
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const char *s)
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{
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char *error;
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int dummy;
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struct iovec iov[4];
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struct iovec *v = iov;
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int iov_cnt = 0;
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FILE *fp = _stderr_r (ptr);
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CHECK_INIT (ptr, fp);
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if (s != NULL && *s != '\0')
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{
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ADD (s);
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ADD (": ");
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}
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if ((error = _strerror_r (ptr, ptr->_errno, 1, &dummy)) != NULL)
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ADD (error);
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#ifdef __SCLE
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ADD ((fp->_flags & __SCLE) ? "\r\n" : "\n");
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#else
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ADD ("\n");
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#endif
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_newlib_flockfile_start (fp);
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fflush (fp);
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writev (fileno (fp), iov, iov_cnt);
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_newlib_flockfile_end (fp);
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}
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#ifndef _REENT_ONLY
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void
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perror (const char *s)
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{
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_perror_r (_REENT, s);
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}
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#endif
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