diff options
Diffstat (limited to 'sysdeps/generic')
| -rw-r--r-- | sysdeps/generic/_strerror.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/sysdeps/generic/_strerror.c b/sysdeps/generic/_strerror.c index bcba45d519..e6f56556aa 100644 --- a/sysdeps/generic/_strerror.c +++ b/sysdeps/generic/_strerror.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 1993, 1995, 1996, 1997 Free Software Foundation, Inc. +/* Copyright (C) 1991, 93, 95, 96, 97, 98 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 @@ -19,7 +19,8 @@ #include <libintl.h> #include <stdio.h> #include <string.h> -#include "../stdio-common/_itoa.h" +#include <sys/param.h> +#include <stdio-common/_itoa.h> #ifndef HAVE_GNU_LD #define _sys_errlist sys_errlist @@ -41,12 +42,27 @@ _strerror_internal (int errnum, char *buf, size_t buflen) { if (errnum < 0 || errnum >= _sys_nerr) { + /* Buffer we use to print the number in. For a maximum size for + `int' of 8 bytes we never need more than 20 digits. */ + char numbuf[21]; const char *unk = _("Unknown error "); const size_t unklen = strlen (unk); - char *p = buf + buflen; - *--p = '\0'; - p = _itoa_word (errnum, p, 10, 0); - return memcpy (p - unklen, unk, unklen); + char *p, *q; + + numbuf[20] = '\0'; + p = _itoa_word (errnum, &numbuf[20], 10, 0); + + /* Now construct the result while taking care for the destination + buffer size. */ + q = __mempcpy (buf, unk, MIN (unklen, buflen)); + if (unklen < buflen) + __stpncpy (q, p, buflen - unklen); + + /* Terminate the string in any case. */ + if (buflen > 0) + buf[buflen - 1] = '\0'; + + return buf; } return (char *) _(_sys_errlist[errnum]); |