--- /dev/null
+/* strerror_r.c --- POSIX compatible system error routine
+
+ Copyright (C) 2010-2012 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2010. */
+
+#include <config.h>
+
+/* Enable declaration of sys_nerr and sys_errlist in <errno.h> on NetBSD. */
+#define _NETBSD_SOURCE 1
+
+/* Specification. */
+#include <string.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "strerror-override.h"
+
+#if (__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__) && HAVE___XPG_STRERROR_R /* glibc >= 2.3.4, cygwin >= 1.7.9 */
+
+# define USE_XPG_STRERROR_R 1
+extern int __xpg_strerror_r (int errnum, char *buf, size_t buflen);
+
+#elif HAVE_DECL_STRERROR_R && !(__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__)
+
+/* The system's strerror_r function is OK, except that its third argument
+ is 'int', not 'size_t', or its return type is wrong. */
+
+# include <limits.h>
+
+# define USE_SYSTEM_STRERROR_R 1
+
+#else /* (__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__ ? !HAVE___XPG_STRERROR_R : !HAVE_DECL_STRERROR_R) */
+
+/* Use the system's strerror(). Exclude glibc and cygwin because the
+ system strerror_r has the wrong return type, and cygwin 1.7.9
+ strerror_r clobbers strerror. */
+# undef strerror
+
+# define USE_SYSTEM_STRERROR 1
+
+# if defined __NetBSD__ || defined __hpux || ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __sgi || (defined __sun && !defined _LP64) || defined __CYGWIN__
+
+/* No locking needed. */
+
+/* Get catgets internationalization functions. */
+# if HAVE_CATGETS
+# include <nl_types.h>
+# endif
+
+/* Get sys_nerr, sys_errlist on HP-UX (otherwise only declared in C++ mode).
+ Get sys_nerr, sys_errlist on IRIX (otherwise only declared with _SGIAPI). */
+# if defined __hpux || defined __sgi
+extern int sys_nerr;
+extern char *sys_errlist[];
+# endif
+
+/* Get sys_nerr on Solaris. */
+# if defined __sun && !defined _LP64
+extern int sys_nerr;
+# endif
+
+# else
+
+# include "glthread/lock.h"
+
+/* This lock protects the buffer returned by strerror(). We assume that
+ no other uses of strerror() exist in the program. */
+gl_lock_define_initialized(static, strerror_lock)
+
+# endif
+
+#endif
+
+/* On MSVC, there is no snprintf() function, just a _snprintf().
+ It is of lower quality, but sufficient for the simple use here.
+ We only have to make sure to NUL terminate the result (_snprintf
+ does not NUL terminate, like strncpy). */
+#if !HAVE_SNPRINTF
+static int
+local_snprintf (char *buf, size_t buflen, const char *format, ...)
+{
+ va_list args;
+ int result;
+
+ va_start (args, format);
+ result = _vsnprintf (buf, buflen, format, args);
+ va_end (args);
+ if (buflen > 0 && (result < 0 || result >= buflen))
+ buf[buflen - 1] = '\0';
+ return result;
+}
+# define snprintf local_snprintf
+#endif
+
+/* Copy as much of MSG into BUF as possible, without corrupting errno.
+ Return 0 if MSG fit in BUFLEN, otherwise return ERANGE. */
+static int
+safe_copy (char *buf, size_t buflen, const char *msg)
+{
+ size_t len = strlen (msg);
+ int ret;
+
+ if (len < buflen)
+ {
+ /* Although POSIX allows memcpy() to corrupt errno, we don't
+ know of any implementation where this is a real problem. */
+ memcpy (buf, msg, len + 1);
+ ret = 0;
+ }
+ else
+ {
+ memcpy (buf, msg, buflen - 1);
+ buf[buflen - 1] = '\0';
+ ret = ERANGE;
+ }
+ return ret;
+}
+
+
+int
+strerror_r (int errnum, char *buf, size_t buflen)
+#undef strerror_r
+{
+ /* Filter this out now, so that rest of this replacement knows that
+ there is room for a non-empty message and trailing NUL. */
+ if (buflen <= 1)
+ {
+ if (buflen)
+ *buf = '\0';
+ return ERANGE;
+ }
+ *buf = '\0';
+
+ /* Check for gnulib overrides. */
+ {
+ char const *msg = strerror_override (errnum);
+
+ if (msg)
+ return safe_copy (buf, buflen, msg);
+ }
+
+ {
+ int ret;
+ int saved_errno = errno;
+
+#if USE_XPG_STRERROR_R
+
+ {
+ ret = __xpg_strerror_r (errnum, buf, buflen);
+ if (ret < 0)
+ ret = errno;
+ if (!*buf)
+ {
+ /* glibc 2.13 would not touch buf on err, so we have to fall
+ back to GNU strerror_r which always returns a thread-safe
+ untruncated string to (partially) copy into our buf. */
+ safe_copy (buf, buflen, strerror_r (errnum, buf, buflen));
+ }
+ }
+
+#elif USE_SYSTEM_STRERROR_R
+
+ if (buflen > INT_MAX)
+ buflen = INT_MAX;
+
+# ifdef __hpux
+ /* On HP-UX 11.31, strerror_r always fails when buflen < 80; it
+ also fails to change buf on EINVAL. */
+ {
+ char stackbuf[80];
+
+ if (buflen < sizeof stackbuf)
+ {
+ ret = strerror_r (errnum, stackbuf, sizeof stackbuf);
+ if (ret == 0)
+ ret = safe_copy (buf, buflen, stackbuf);
+ }
+ else
+ ret = strerror_r (errnum, buf, buflen);
+ }
+# else
+ ret = strerror_r (errnum, buf, buflen);
+
+ /* Some old implementations may return (-1, EINVAL) instead of EINVAL. */
+ if (ret < 0)
+ ret = errno;
+# endif
+
+# ifdef _AIX
+ /* AIX returns 0 rather than ERANGE when truncating strings; try
+ again until we are sure we got the entire string. */
+ if (!ret && strlen (buf) == buflen - 1)
+ {
+ char stackbuf[STACKBUF_LEN];
+ size_t len;
+ strerror_r (errnum, stackbuf, sizeof stackbuf);
+ len = strlen (stackbuf);
+ /* STACKBUF_LEN should have been large enough. */
+ if (len + 1 == sizeof stackbuf)
+ abort ();
+ if (buflen <= len)
+ ret = ERANGE;
+ }
+# else
+ /* Solaris 10 does not populate buf on ERANGE. OpenBSD 4.7
+ truncates early on ERANGE rather than return a partial integer.
+ We prefer the maximal string. We set buf[0] earlier, and we
+ know of no implementation that modifies buf to be an
+ unterminated string, so this strlen should be portable in
+ practice (rather than pulling in a safer strnlen). */
+ if (ret == ERANGE && strlen (buf) < buflen - 1)
+ {
+ char stackbuf[STACKBUF_LEN];
+
+ /* STACKBUF_LEN should have been large enough. */
+ if (strerror_r (errnum, stackbuf, sizeof stackbuf) == ERANGE)
+ abort ();
+ safe_copy (buf, buflen, stackbuf);
+ }
+# endif
+
+#else /* USE_SYSTEM_STRERROR */
+
+ /* Try to do what strerror (errnum) does, but without clobbering the
+ buffer used by strerror(). */
+
+# if defined __NetBSD__ || defined __hpux || ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __CYGWIN__ /* NetBSD, HP-UX, native Windows, Cygwin */
+
+ /* NetBSD: sys_nerr, sys_errlist are declared through _NETBSD_SOURCE
+ and <errno.h> above.
+ HP-UX: sys_nerr, sys_errlist are declared explicitly above.
+ native Windows: sys_nerr, sys_errlist are declared in <stdlib.h>.
+ Cygwin: sys_nerr, sys_errlist are declared in <errno.h>. */
+ if (errnum >= 0 && errnum < sys_nerr)
+ {
+# if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
+# if defined __NetBSD__
+ nl_catd catd = catopen ("libc", NL_CAT_LOCALE);
+ const char *errmsg =
+ (catd != (nl_catd)-1
+ ? catgets (catd, 1, errnum, sys_errlist[errnum])
+ : sys_errlist[errnum]);
+# endif
+# if defined __hpux
+ nl_catd catd = catopen ("perror", NL_CAT_LOCALE);
+ const char *errmsg =
+ (catd != (nl_catd)-1
+ ? catgets (catd, 1, 1 + errnum, sys_errlist[errnum])
+ : sys_errlist[errnum]);
+# endif
+# else
+ const char *errmsg = sys_errlist[errnum];
+# endif
+ if (errmsg == NULL || *errmsg == '\0')
+ ret = EINVAL;
+ else
+ ret = safe_copy (buf, buflen, errmsg);
+# if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
+ if (catd != (nl_catd)-1)
+ catclose (catd);
+# endif
+ }
+ else
+ ret = EINVAL;
+
+# elif defined __sgi || (defined __sun && !defined _LP64) /* IRIX, Solaris <= 9 32-bit */
+
+ /* For a valid error number, the system's strerror() function returns
+ a pointer to a not copied string, not to a buffer. */
+ if (errnum >= 0 && errnum < sys_nerr)
+ {
+ char *errmsg = strerror (errnum);
+
+ if (errmsg == NULL || *errmsg == '\0')
+ ret = EINVAL;
+ else
+ ret = safe_copy (buf, buflen, errmsg);
+ }
+ else
+ ret = EINVAL;
+
+# else
+
+ gl_lock_lock (strerror_lock);
+
+ {
+ char *errmsg = strerror (errnum);
+
+ /* For invalid error numbers, strerror() on
+ - IRIX 6.5 returns NULL,
+ - HP-UX 11 returns an empty string. */
+ if (errmsg == NULL || *errmsg == '\0')
+ ret = EINVAL;
+ else
+ ret = safe_copy (buf, buflen, errmsg);
+ }
+
+ gl_lock_unlock (strerror_lock);
+
+# endif
+
+#endif
+
+ if (ret == EINVAL && !*buf)
+ snprintf (buf, buflen, "Unknown error %d", errnum);
+
+ errno = saved_errno;
+ return ret;
+ }
+}
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