1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* and/or other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
FUNCTION
<<perror>>---print an error message on standard error
INDEX
perror
INDEX
_perror_r
SYNOPSIS
#include <stdio.h>
void perror(char *<[prefix]>);
void _perror_r(struct _reent *<[reent]>, char *<[prefix]>);
DESCRIPTION
Use <<perror>> to print (on standard error) an error message
corresponding to the current value of the global variable <<errno>>.
Unless you use <<NULL>> as the value of the argument <[prefix]>, the
error message will begin with the string at <[prefix]>, followed by a
colon and a space (<<: >>). The remainder of the error message is one
of the strings described for <<strerror>>.
The alternate function <<_perror_r>> is a reentrant version. The
extra argument <[reent]> is a pointer to a reentrancy structure.
RETURNS
<<perror>> returns no result.
PORTABILITY
ANSI C requires <<perror>>, but the strings issued vary from one
implementation to another.
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
*/
#include <_ansi.h>
#include <reent.h>
#include <stdio.h>
#include <string.h>
#include "local.h"
#define WRITE_STR(str) \
{ \
const char *p = (str); \
size_t len = strlen (p); \
while (len) \
{ \
ssize_t len1 = _write_r (ptr, fileno (fp), p, len); \
if (len1 < 0) \
break; \
len -= len1; \
p += len1; \
} \
}
void
_perror_r (struct _reent *ptr,
const char *s)
{
char *error;
int dummy;
FILE *fp = _stderr_r (ptr);
CHECK_INIT (ptr, fp);
_newlib_flockfile_start(fp);
_fflush_r (ptr, fp);
if (s != NULL && *s != '\0')
{
WRITE_STR (s);
WRITE_STR (": ");
}
if ((error = _strerror_r (ptr, ptr->_errno, 1, &dummy)) != NULL)
WRITE_STR (error);
#ifdef __SCLE
WRITE_STR ((fp->_flags & __SCLE) ? "\r\n" : "\n");
#else
WRITE_STR ("\n");
#endif
fp->_flags &= ~__SOFF;
_newlib_flockfile_end(fp);
}
#ifndef _REENT_ONLY
void
perror (const char *s)
{
_perror_r (_REENT, s);
}
#endif
|
