xref: /titanic_44/usr/src/lib/libast/common/string/strerror.c (revision 56b2bdd1f04d465cfe4a95b88ae5cba5884154e4)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 
24 /*
25  * Glenn Fowler
26  * AT&T Research
27  *
28  * return error message string given errno
29  */
30 
31 #include "lclib.h"
32 
33 #include "FEATURE/errno"
34 
35 #undef	strerror
36 
37 #if !defined(sys_errlist) && !_def_errno_sys_errlist
38 #if _dat_sys_errlist
39 extern char*	sys_errlist[];
40 #else
41 #undef		_dat_sys_nerr
42 char*		sys_errlist[] = { 0 };
43 #endif
44 #endif
45 
46 #if !defined(sys_nerr) && !_def_errno_sys_nerr
47 #if _dat_sys_nerr
48 extern int	sys_nerr;
49 #else
50 #undef		_dat_sys_nerr
51 int		sys_nerr = 0;
52 #endif
53 #endif
54 
55 #if _lib_strerror
56 extern char*	strerror(int);
57 #endif
58 
59 #if _PACKAGE_astsa
60 
61 #define fmtbuf(n)	((n),tmp)
62 
63 static char		tmp[32];
64 
65 #endif
66 
67 char*
68 _ast_strerror(int err)
69 {
70 	char*		msg;
71 	int		z;
72 
73 #if _lib_strerror
74 	z = errno;
75 	msg = strerror(err);
76 	errno = z;
77 #else
78 	if (err > 0 && err <= sys_nerr)
79 		msg = (char*)sys_errlist[err];
80 	else
81 		msg = 0;
82 #endif
83 	if (msg)
84 	{
85 #if !_PACKAGE_astsa
86 		if (ERROR_translating())
87 		{
88 #if _lib_strerror
89 			static int	sys;
90 
91 			if (!sys)
92 			{
93 				char*	s;
94 				char*	t;
95 				char*	p;
96 
97 #if _lib_strerror
98 				/*
99 				 * stash the pending strerror() msg
100 				 */
101 
102 				msg = strcpy(fmtbuf(strlen(msg) + 1), msg);
103 #endif
104 
105 				/*
106 				 * make sure that strerror() translates
107 				 */
108 
109 				if (!(s = strerror(1)))
110 					sys = -1;
111 				else
112 				{
113 					t = fmtbuf(z = strlen(s) + 1);
114 					strcpy(t, s);
115 					ast.locale.set |= AST_LC_internal;
116 					p = setlocale(LC_MESSAGES, NiL);
117 					setlocale(LC_MESSAGES, "C");
118 					sys = (s = strerror(1)) && strcmp(s, t) ? 1 : -1;
119 					setlocale(LC_MESSAGES, p);
120 					ast.locale.set &= ~AST_LC_internal;
121 				}
122 			}
123 			if (sys > 0)
124 				return msg;
125 #endif
126 			return ERROR_translate(NiL, NiL, "errlist", msg);
127 		}
128 #endif
129 		return msg;
130 	}
131 	msg = fmtbuf(z = 32);
132 	sfsprintf(msg, z, ERROR_translate(NiL, NiL, "errlist", "Error %d"), err);
133 	return msg;
134 }
135 
136 #if !_lib_strerror
137 
138 #if defined(__EXPORT__)
139 #define extern		__EXPORT__
140 #endif
141 
142 extern char*
143 strerror(int err)
144 {
145 	return _ast_strerror(err);
146 }
147 
148 #endif
149