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Commit	Line	Data
	1	/*-
	2	* Copyright (c) 1988, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
	34	__FBSDID("$FreeBSD: src/lib/libc/string/strerror.c,v 1.16 2007/01/09 00:28:12 imp Exp $");
	35
	36	#if defined(NLS)
	37	#include <nl_types.h>
	38	#endif
	39
	40	#include <limits.h>
	41	#include <errno.h>
	42	#include <string.h>
	43	#include <stdio.h>
	44	#include <stdlib.h>
	45
	46	#define UPREFIX "Unknown error"
	47
	48	/*
	49	* Define a buffer size big enough to describe a 64-bit signed integer
	50	* converted to ASCII decimal (19 bytes), with an optional leading sign
	51	* (1 byte); finally, we get the prefix, delimiter (": ") and a trailing
	52	* NUL from UPREFIX.
	53	*/
	54	#define EBUFSIZE (20 + 2 + sizeof(UPREFIX))
	55
	56	#ifndef BUILDING_VARIANT
	57	/*
	58	* Doing this by hand instead of linking with stdio(3) avoids bloat for
	59	* statically linked binaries.
	60	*/
	61	__private_extern__ void
	62	__errstr(int num, char uprefix, char buf, size_t len)
	63	{
	64	char *t;
	65	unsigned int uerr;
	66	char tmp[EBUFSIZE];
	67
	68	t = tmp + sizeof(tmp);
	69	*--t = '\0';
	70	uerr = (num >= 0) ? num : -num;
	71	do {
	72	*--t = "0123456789"[uerr % 10];
	73	} while (uerr /= 10);
	74	if (num < 0)
	75	*--t = '-';
	76	*--t = ' ';
	77	*--t = ':';
	78	strlcpy(buf, uprefix, len);
	79	strlcat(buf, t, len);
	80	}
	81
	82	int
	83	strerror_r(int errnum, char *strerrbuf, size_t buflen)
	84	{
	85	int retval = 0;
	86	#if defined(NLS)
	87	int saved_errno = errno;
	88	nl_catd catd;
	89	catd = catopen("libc", NL_CAT_LOCALE);
	90	#endif
	91
	92	if (errnum < 0 \|\| errnum >= sys_nerr) {
	93	__errstr(errnum,
	94	#if defined(NLS)
	95	catgets(catd, 1, 0xffff, UPREFIX),
	96	#else
	97	UPREFIX,
	98	#endif
	99	strerrbuf, buflen);
	100	retval = EINVAL;
	101	} else {
	102	if (strlcpy(strerrbuf,
	103	#if defined(NLS)
	104	catgets(catd, 1, errnum, sys_errlist[errnum]),
	105	#else
	106	sys_errlist[errnum],
	107	#endif
	108	buflen) >= buflen)
	109	retval = ERANGE;
	110	}
	111
	112	#if defined(NLS)
	113	catclose(catd);
	114	errno = saved_errno;
	115	#endif
	116
	117	return (retval);
	118	}
	119
	120	__private_extern__ char *__strerror_ebuf = NULL;
	121	#else /* BUILDING_VARIANT */
	122	__private_extern__ void __errstr(int, char *, size_t);
	123
	124	extern char *__strerror_ebuf;
	125	#endif /* !BUILDING_VARIANT */
	126
	127	char *
	128	strerror(int num)
	129	{
	130	// Dynamically allocate a big buffer to receive the text then shrink it
	131	// down to the actual size needed.
	132	size_t ebufsiz = NL_TEXTMAX;
	133
	134	if (__strerror_ebuf == NULL) {
	135	__strerror_ebuf = calloc(1, ebufsiz);
	136	if (__strerror_ebuf == NULL) {
	137	return NULL;
	138	}
	139	}
	140
	141	if (strerror_r(num, __strerror_ebuf, ebufsiz) != 0) {
	142	#if !__DARWIN_UNIX03
	143	errno = EINVAL;
	144	#endif
	145	}
	146	return __strerror_ebuf;
	147	}