105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* strerror_r.c --- POSIX compatible system error routine 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2010-2012 Free Software Foundation, Inc. 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software: you can redistribute it and/or modify 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang it under the terms of the GNU General Public License as published by 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3 of the License, or 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang (at your option) any later version. 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNU General Public License for more details. 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program. If not, see <http://www.gnu.org/licenses/>. */ 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Written by Bruno Haible <bruno@clisp.org>, 2010. */ 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <config.h> 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Enable declaration of sys_nerr and sys_errlist in <errno.h> on NetBSD. */ 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _NETBSD_SOURCE 1 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Specification. */ 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <string.h> 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <errno.h> 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdio.h> 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdlib.h> 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include "strerror-override.h" 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if (__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__) && HAVE___XPG_STRERROR_R /* glibc >= 2.3.4, cygwin >= 1.7.9 */ 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define USE_XPG_STRERROR_R 1 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wangextern int __xpg_strerror_r (int errnum, char *buf, size_t buflen); 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#elif HAVE_DECL_STRERROR_R && !(__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__) 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* The system's strerror_r function is OK, except that its third argument 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang is 'int', not 'size_t', or its return type is wrong. */ 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# include <limits.h> 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define USE_SYSTEM_STRERROR_R 1 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else /* (__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__ ? !HAVE___XPG_STRERROR_R : !HAVE_DECL_STRERROR_R) */ 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Use the system's strerror(). Exclude glibc and cygwin because the 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang system strerror_r has the wrong return type, and cygwin 1.7.9 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang strerror_r clobbers strerror. */ 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# undef strerror 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define USE_SYSTEM_STRERROR 1 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if defined __NetBSD__ || defined __hpux || ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __sgi || (defined __sun && !defined _LP64) || defined __CYGWIN__ 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* No locking needed. */ 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Get catgets internationalization functions. */ 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if HAVE_CATGETS 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# include <nl_types.h> 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6605436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Get sys_nerr, sys_errlist on HP-UX (otherwise only declared in C++ mode). 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang Get sys_nerr, sys_errlist on IRIX (otherwise only declared with _SGIAPI). */ 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if defined __hpux || defined __sgi 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wangextern int sys_nerr; 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wangextern char *sys_errlist[]; 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 7205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7305436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Get sys_nerr on Solaris. */ 7405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if defined __sun && !defined _LP64 7505436638acc7c010349a69c3395f1a57c642dc62Ying Wangextern int sys_nerr; 7605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 7705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 7905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 8005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# include "glthread/lock.h" 8105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 8205436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* This lock protects the buffer returned by strerror(). We assume that 8305436638acc7c010349a69c3395f1a57c642dc62Ying Wang no other uses of strerror() exist in the program. */ 8405436638acc7c010349a69c3395f1a57c642dc62Ying Wanggl_lock_define_initialized(static, strerror_lock) 8505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 8605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 8705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 8805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 8905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 9005436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* On MSVC, there is no snprintf() function, just a _snprintf(). 9105436638acc7c010349a69c3395f1a57c642dc62Ying Wang It is of lower quality, but sufficient for the simple use here. 9205436638acc7c010349a69c3395f1a57c642dc62Ying Wang We only have to make sure to NUL terminate the result (_snprintf 9305436638acc7c010349a69c3395f1a57c642dc62Ying Wang does not NUL terminate, like strncpy). */ 9405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if !HAVE_SNPRINTF 9505436638acc7c010349a69c3395f1a57c642dc62Ying Wangstatic int 9605436638acc7c010349a69c3395f1a57c642dc62Ying Wanglocal_snprintf (char *buf, size_t buflen, const char *format, ...) 9705436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 9805436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_list args; 9905436638acc7c010349a69c3395f1a57c642dc62Ying Wang int result; 10005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 10105436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_start (args, format); 10205436638acc7c010349a69c3395f1a57c642dc62Ying Wang result = _vsnprintf (buf, buflen, format, args); 10305436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_end (args); 10405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (buflen > 0 && (result < 0 || result >= buflen)) 10505436638acc7c010349a69c3395f1a57c642dc62Ying Wang buf[buflen - 1] = '\0'; 10605436638acc7c010349a69c3395f1a57c642dc62Ying Wang return result; 10705436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 10805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define snprintf local_snprintf 10905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 11005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 11105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Copy as much of MSG into BUF as possible, without corrupting errno. 11205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Return 0 if MSG fit in BUFLEN, otherwise return ERANGE. */ 11305436638acc7c010349a69c3395f1a57c642dc62Ying Wangstatic int 11405436638acc7c010349a69c3395f1a57c642dc62Ying Wangsafe_copy (char *buf, size_t buflen, const char *msg) 11505436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 11605436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t len = strlen (msg); 11705436638acc7c010349a69c3395f1a57c642dc62Ying Wang int ret; 11805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 11905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (len < buflen) 12005436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 12105436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Although POSIX allows memcpy() to corrupt errno, we don't 12205436638acc7c010349a69c3395f1a57c642dc62Ying Wang know of any implementation where this is a real problem. */ 12305436638acc7c010349a69c3395f1a57c642dc62Ying Wang memcpy (buf, msg, len + 1); 12405436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = 0; 12505436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 12605436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 12705436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 12805436638acc7c010349a69c3395f1a57c642dc62Ying Wang memcpy (buf, msg, buflen - 1); 12905436638acc7c010349a69c3395f1a57c642dc62Ying Wang buf[buflen - 1] = '\0'; 13005436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = ERANGE; 13105436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 13205436638acc7c010349a69c3395f1a57c642dc62Ying Wang return ret; 13305436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 13405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 13505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 13605436638acc7c010349a69c3395f1a57c642dc62Ying Wangint 13705436638acc7c010349a69c3395f1a57c642dc62Ying Wangstrerror_r (int errnum, char *buf, size_t buflen) 13805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#undef strerror_r 13905436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 14005436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Filter this out now, so that rest of this replacement knows that 14105436638acc7c010349a69c3395f1a57c642dc62Ying Wang there is room for a non-empty message and trailing NUL. */ 14205436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (buflen <= 1) 14305436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 14405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (buflen) 14505436638acc7c010349a69c3395f1a57c642dc62Ying Wang *buf = '\0'; 14605436638acc7c010349a69c3395f1a57c642dc62Ying Wang return ERANGE; 14705436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 14805436638acc7c010349a69c3395f1a57c642dc62Ying Wang *buf = '\0'; 14905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 15005436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Check for gnulib overrides. */ 15105436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 15205436638acc7c010349a69c3395f1a57c642dc62Ying Wang char const *msg = strerror_override (errnum); 15305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 15405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (msg) 15505436638acc7c010349a69c3395f1a57c642dc62Ying Wang return safe_copy (buf, buflen, msg); 15605436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 15705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 15805436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 15905436638acc7c010349a69c3395f1a57c642dc62Ying Wang int ret; 16005436638acc7c010349a69c3395f1a57c642dc62Ying Wang int saved_errno = errno; 16105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 16205436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if USE_XPG_STRERROR_R 16305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 16405436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 16505436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = __xpg_strerror_r (errnum, buf, buflen); 16605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (ret < 0) 16705436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = errno; 16805436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!*buf) 16905436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 17005436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* glibc 2.13 would not touch buf on err, so we have to fall 17105436638acc7c010349a69c3395f1a57c642dc62Ying Wang back to GNU strerror_r which always returns a thread-safe 17205436638acc7c010349a69c3395f1a57c642dc62Ying Wang untruncated string to (partially) copy into our buf. */ 17305436638acc7c010349a69c3395f1a57c642dc62Ying Wang safe_copy (buf, buflen, strerror_r (errnum, buf, buflen)); 17405436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 17505436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 17605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 17705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#elif USE_SYSTEM_STRERROR_R 17805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 17905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (buflen > INT_MAX) 18005436638acc7c010349a69c3395f1a57c642dc62Ying Wang buflen = INT_MAX; 18105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 18205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# ifdef __hpux 18305436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* On HP-UX 11.31, strerror_r always fails when buflen < 80; it 18405436638acc7c010349a69c3395f1a57c642dc62Ying Wang also fails to change buf on EINVAL. */ 18505436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 18605436638acc7c010349a69c3395f1a57c642dc62Ying Wang char stackbuf[80]; 18705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 18805436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (buflen < sizeof stackbuf) 18905436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 19005436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = strerror_r (errnum, stackbuf, sizeof stackbuf); 19105436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (ret == 0) 19205436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = safe_copy (buf, buflen, stackbuf); 19305436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 19405436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 19505436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = strerror_r (errnum, buf, buflen); 19605436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 19705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 19805436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = strerror_r (errnum, buf, buflen); 19905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 20005436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Some old implementations may return (-1, EINVAL) instead of EINVAL. */ 20105436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (ret < 0) 20205436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = errno; 20305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 20405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 20505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# ifdef _AIX 20605436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* AIX returns 0 rather than ERANGE when truncating strings; try 20705436638acc7c010349a69c3395f1a57c642dc62Ying Wang again until we are sure we got the entire string. */ 20805436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!ret && strlen (buf) == buflen - 1) 20905436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 21005436638acc7c010349a69c3395f1a57c642dc62Ying Wang char stackbuf[STACKBUF_LEN]; 21105436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t len; 21205436638acc7c010349a69c3395f1a57c642dc62Ying Wang strerror_r (errnum, stackbuf, sizeof stackbuf); 21305436638acc7c010349a69c3395f1a57c642dc62Ying Wang len = strlen (stackbuf); 21405436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* STACKBUF_LEN should have been large enough. */ 21505436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (len + 1 == sizeof stackbuf) 21605436638acc7c010349a69c3395f1a57c642dc62Ying Wang abort (); 21705436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (buflen <= len) 21805436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = ERANGE; 21905436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 22005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 22105436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Solaris 10 does not populate buf on ERANGE. OpenBSD 4.7 22205436638acc7c010349a69c3395f1a57c642dc62Ying Wang truncates early on ERANGE rather than return a partial integer. 22305436638acc7c010349a69c3395f1a57c642dc62Ying Wang We prefer the maximal string. We set buf[0] earlier, and we 22405436638acc7c010349a69c3395f1a57c642dc62Ying Wang know of no implementation that modifies buf to be an 22505436638acc7c010349a69c3395f1a57c642dc62Ying Wang unterminated string, so this strlen should be portable in 22605436638acc7c010349a69c3395f1a57c642dc62Ying Wang practice (rather than pulling in a safer strnlen). */ 22705436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (ret == ERANGE && strlen (buf) < buflen - 1) 22805436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 22905436638acc7c010349a69c3395f1a57c642dc62Ying Wang char stackbuf[STACKBUF_LEN]; 23005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 23105436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* STACKBUF_LEN should have been large enough. */ 23205436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (strerror_r (errnum, stackbuf, sizeof stackbuf) == ERANGE) 23305436638acc7c010349a69c3395f1a57c642dc62Ying Wang abort (); 23405436638acc7c010349a69c3395f1a57c642dc62Ying Wang safe_copy (buf, buflen, stackbuf); 23505436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 23605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 23705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 23805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else /* USE_SYSTEM_STRERROR */ 23905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 24005436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Try to do what strerror (errnum) does, but without clobbering the 24105436638acc7c010349a69c3395f1a57c642dc62Ying Wang buffer used by strerror(). */ 24205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 24305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if defined __NetBSD__ || defined __hpux || ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __CYGWIN__ /* NetBSD, HP-UX, native Windows, Cygwin */ 24405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 24505436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* NetBSD: sys_nerr, sys_errlist are declared through _NETBSD_SOURCE 24605436638acc7c010349a69c3395f1a57c642dc62Ying Wang and <errno.h> above. 24705436638acc7c010349a69c3395f1a57c642dc62Ying Wang HP-UX: sys_nerr, sys_errlist are declared explicitly above. 24805436638acc7c010349a69c3395f1a57c642dc62Ying Wang native Windows: sys_nerr, sys_errlist are declared in <stdlib.h>. 24905436638acc7c010349a69c3395f1a57c642dc62Ying Wang Cygwin: sys_nerr, sys_errlist are declared in <errno.h>. */ 25005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (errnum >= 0 && errnum < sys_nerr) 25105436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 25205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux) 25305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if defined __NetBSD__ 25405436638acc7c010349a69c3395f1a57c642dc62Ying Wang nl_catd catd = catopen ("libc", NL_CAT_LOCALE); 25505436638acc7c010349a69c3395f1a57c642dc62Ying Wang const char *errmsg = 25605436638acc7c010349a69c3395f1a57c642dc62Ying Wang (catd != (nl_catd)-1 25705436638acc7c010349a69c3395f1a57c642dc62Ying Wang ? catgets (catd, 1, errnum, sys_errlist[errnum]) 25805436638acc7c010349a69c3395f1a57c642dc62Ying Wang : sys_errlist[errnum]); 25905436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 26005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if defined __hpux 26105436638acc7c010349a69c3395f1a57c642dc62Ying Wang nl_catd catd = catopen ("perror", NL_CAT_LOCALE); 26205436638acc7c010349a69c3395f1a57c642dc62Ying Wang const char *errmsg = 26305436638acc7c010349a69c3395f1a57c642dc62Ying Wang (catd != (nl_catd)-1 26405436638acc7c010349a69c3395f1a57c642dc62Ying Wang ? catgets (catd, 1, 1 + errnum, sys_errlist[errnum]) 26505436638acc7c010349a69c3395f1a57c642dc62Ying Wang : sys_errlist[errnum]); 26605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 26705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 26805436638acc7c010349a69c3395f1a57c642dc62Ying Wang const char *errmsg = sys_errlist[errnum]; 26905436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 27005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (errmsg == NULL || *errmsg == '\0') 27105436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = EINVAL; 27205436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 27305436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = safe_copy (buf, buflen, errmsg); 27405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux) 27505436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (catd != (nl_catd)-1) 27605436638acc7c010349a69c3395f1a57c642dc62Ying Wang catclose (catd); 27705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 27805436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 27905436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 28005436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = EINVAL; 28105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 28205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# elif defined __sgi || (defined __sun && !defined _LP64) /* IRIX, Solaris <= 9 32-bit */ 28305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 28405436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* For a valid error number, the system's strerror() function returns 28505436638acc7c010349a69c3395f1a57c642dc62Ying Wang a pointer to a not copied string, not to a buffer. */ 28605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (errnum >= 0 && errnum < sys_nerr) 28705436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 28805436638acc7c010349a69c3395f1a57c642dc62Ying Wang char *errmsg = strerror (errnum); 28905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 29005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (errmsg == NULL || *errmsg == '\0') 29105436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = EINVAL; 29205436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 29305436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = safe_copy (buf, buflen, errmsg); 29405436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 29505436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 29605436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = EINVAL; 29705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 29805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 29905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 30005436638acc7c010349a69c3395f1a57c642dc62Ying Wang gl_lock_lock (strerror_lock); 30105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 30205436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 30305436638acc7c010349a69c3395f1a57c642dc62Ying Wang char *errmsg = strerror (errnum); 30405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 30505436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* For invalid error numbers, strerror() on 30605436638acc7c010349a69c3395f1a57c642dc62Ying Wang - IRIX 6.5 returns NULL, 30705436638acc7c010349a69c3395f1a57c642dc62Ying Wang - HP-UX 11 returns an empty string. */ 30805436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (errmsg == NULL || *errmsg == '\0') 30905436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = EINVAL; 31005436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 31105436638acc7c010349a69c3395f1a57c642dc62Ying Wang ret = safe_copy (buf, buflen, errmsg); 31205436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 31305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 31405436638acc7c010349a69c3395f1a57c642dc62Ying Wang gl_lock_unlock (strerror_lock); 31505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 31605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 31705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 31805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 31905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 32005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (ret == EINVAL && !*buf) 32105436638acc7c010349a69c3395f1a57c642dc62Ying Wang snprintf (buf, buflen, "Unknown error %d", errnum); 32205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 32305436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = saved_errno; 32405436638acc7c010349a69c3395f1a57c642dc62Ying Wang return ret; 32505436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 32605436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 327