const char *
MR_strerror(int errnum, char *buf, size_t buflen)
{
#if defined(MR_HAVE_STRERROR_S)
/*
** MSVC has strerror_s. It also exists in C11 Annex K and is enabled by
** defining a preprocessor macro __STDC_WANT_LIB_EXT1__
*/
if (strerror_s(buf, buflen, errnum) != 0) {
generic_strerror(buf, buflen, errnum);
}
return buf;
#elif defined(MR_HAVE_STRERROR_R)
/*
** The XSI-compliant and Mac OS X strerror_r populates buf unless it fails.
** The GNU-specific strerror_r does not always populate buf.
*/
#if !defined(__GNU_LIBRARY__) || \
((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE)
int x = strerror_r(errnum, buf, buflen);
if (x != 0) {
generic_strerror(buf, buflen, errnum);
}
return buf;
#else
const char *s = strerror_r(errnum, buf, buflen);
return s;
#endif
#else
/*
** Fallback using deprecated variables. This is used on MinGW at least.
**
** strerror_l is another thread-safe alternative, specified in POSIX.
** It is locale-sensitive and takes a locale argument so we don't use it
** for now.
*/
if (errnum >= 0 && errnum < sys_nerr && sys_errlist[errnum] != NULL) {
return sys_errlist[errnum];
} else {
generic_strerror(buf, buflen, errnum);
return buf;
}
#endif
}
const char *
MR_strerror(int errnum, char *buf, size_t buflen)
{
#if defined(MR_HAVE_STRERROR_S) && !defined(MR_MINGW)
// MSVC has strerror_s. It also exists in C11 Annex K and is enabled by
// defining a preprocessor macro __STDC_WANT_LIB_EXT1__
//
// On MinGW-w64, strerror_s results in an undefined reference to strerror_s
// in MSVCRT.DLL on Windows XP. Avoid it until we drop support for XP.
if (strerror_s(buf, buflen, errnum) != 0) {
generic_strerror(buf, buflen, errnum);
}
return buf;
#elif defined(MR_HAVE_STRERROR_R)
// The XSI-compliant and Mac OS X strerror_r populates buf unless it fails.
// The GNU-specific strerror_r does not always populate buf.
#if !defined(__GNU_LIBRARY__) || \
((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE)
int x = strerror_r(errnum, buf, buflen);
if (x != 0) {
generic_strerror(buf, buflen, errnum);
}
return buf;
#else
const char *s = strerror_r(errnum, buf, buflen);
return s;
#endif
#else
// Fallback using deprecated variables. This is used on MinGW at least.
//
// strerror_l is another thread-safe alternative, specified in POSIX.
// It is locale-sensitive and takes a locale argument so we don't use it
// for now.
if (errnum >= 0 && errnum < sys_nerr && sys_errlist[errnum] != NULL) {
return sys_errlist[errnum];
} else {
generic_strerror(buf, buflen, errnum);
return buf;
}
#endif
}
