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freebsd/lib/libc/locale/ansi.c
Andrey A. Chernov a4beee718b fix unsigned overflow
PR: 8437
1998-10-25 05:06:42 +00:00

152 lines
3.6 KiB
C

/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ansi.c 8.1 (Berkeley) 6/27/93";
#endif /* LIBC_SCCS and not lint */
#include <stdlib.h>
#include <limits.h>
#include <stddef.h>
#include <rune.h>
int
mblen(s, n)
const char *s;
size_t n;
{
char const *e;
if (s == 0 || *s == 0)
return (0); /* No support for state dependent encodings. */
if (sgetrune(s, n, &e) == _INVALID_RUNE)
return (s - e);
return (e - s);
}
int
mbtowc(pwc, s, n)
wchar_t *pwc;
const char *s;
size_t n;
{
char const *e;
rune_t r;
if (s == 0 || *s == 0)
return (0); /* No support for state dependent encodings. */
if ((r = sgetrune(s, n, &e)) == _INVALID_RUNE)
return (s - e);
if (pwc)
*pwc = r;
return (e - s);
}
int
wctomb(s, wchar)
char *s;
wchar_t wchar;
{
char *e;
if (s == 0)
return (0); /* No support for state dependent encodings. */
if (wchar == 0) {
*s = 0;
return (1);
}
sputrune(wchar, s, MB_CUR_MAX, &e);
return (e ? e - s : -1);
}
size_t
mbstowcs(pwcs, s, n)
wchar_t *pwcs;
const char *s;
size_t n;
{
char const *e;
int cnt = 0;
if (!pwcs || !s)
return (-1);
while (n-- > 0) {
*pwcs = sgetrune(s, MB_LEN_MAX, &e);
if (*pwcs == _INVALID_RUNE)
return (-1);
if (*pwcs++ == 0)
break;
s = e;
++cnt;
}
return (cnt);
}
size_t
wcstombs(s, pwcs, n)
char *s;
const wchar_t *pwcs;
size_t n;
{
char *e;
int cnt, nb;
if (!pwcs || !s || n > INT_MAX)
return (-1);
nb = n;
cnt = 0;
while (nb > 0) {
if (*pwcs == 0) {
*s = 0;
break;
}
if (!sputrune(*pwcs++, s, nb, &e))
return (-1); /* encoding error */
if (!e) /* too long */
return (cnt);
cnt += e - s;
nb -= e - s;
s = e;
}
return (cnt);
}