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BZ#14317: Optimze __xpg_strerror_r

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[BZ #14317]
* string/xpg-strerror.c (__xpg_strerror_r): Optimize, call
strlen only if needed.
This commit is contained in:
2012-12-27 Bruno Haible
2012-12-27 22:37:39 +01:00
committed by Andreas Jaeger
parent 9c7595bda2
commit 7fffbdfff7
3 changed files with 23 additions and 9 deletions
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24
string/xpg-strerror.c
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@ -1,5 +1,4 @@
/* Copyright (C) 1991, 1993, 1995-1998, 2000, 2002, 2004, 2010, 2011
Free Software Foundation, Inc.
/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -28,20 +27,27 @@ int
__xpg_strerror_r (int errnum, char *buf, size_t buflen)
{
const char *estr = __strerror_r (errnum, buf, buflen);
size_t estrlen = strlen (estr);
/* We know that __strerror_r returns buf (with a dynamically computed
string) if errnum is invalid, otherwise it returns a string whose
storage has indefinite extent. */
if (estr == buf)
{
assert (errnum < 0 || errnum >= _sys_nerr_internal
|| _sys_errlist_internal[errnum] == NULL);
return EINVAL;
}
assert (errnum >= 0 && errnum < _sys_nerr_internal
&& _sys_errlist_internal[errnum] != NULL);
else
{
assert (errnum >= 0 && errnum < _sys_nerr_internal
&& _sys_errlist_internal[errnum] != NULL);
/* Terminate the string in any case. */
if (buflen > 0)
*((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0';
size_t estrlen = strlen (estr);
return buflen <= estrlen ? ERANGE : 0;
/* Terminate the string in any case. */
if (buflen > 0)
*((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0';
return buflen <= estrlen ? ERANGE : 0;
}
}