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Code Issues Releases Activity

Implement the XSI extension which allows the destination string to be

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NULL, and returns the number of bytes that would be required to store
the result of the conversion without storing anything.

PR:		17694
This commit is contained in:
Tim J. Robbins 2002-08-31 14:16:12 +00:00
parent 83e563275f
commit a5f76f1911
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=102701
2 changed files with 48 additions and 6 deletions
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25
lib/libc/locale/mbstowcs.c
View File

@ -37,6 +37,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <stddef.h>
@ -50,18 +51,38 @@ mbstowcs(pwcs, s, n)
{
char const *e;
int cnt = 0;
rune_t r;
if (!pwcs || !s)
if (!s) {
errno = EINVAL;
return (-1);
}
if (pwcs == NULL) {
/* Convert and count only, do not store. */
while ((r = sgetrune(s, MB_LEN_MAX, &e)) != _INVALID_RUNE &&
r != 0) {
s = e;
cnt++;
}
if (r == _INVALID_RUNE) {
errno = EILSEQ;
return (-1);
}
}
/* Convert, store and count characters. */
while (n-- > 0) {
*pwcs = sgetrune(s, MB_LEN_MAX, &e);
if (*pwcs == _INVALID_RUNE)
if (*pwcs == _INVALID_RUNE) {
errno = EILSEQ;
return (-1);
}
if (*pwcs++ == 0)
break;
s = e;
++cnt;
}
return (cnt);
}

29
lib/libc/locale/wcstombs.c
View File

@ -37,6 +37,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <stddef.h>
@ -48,26 +49,46 @@ wcstombs(s, pwcs, n)
const wchar_t *pwcs;
size_t n;
{
char buf[MB_LEN_MAX];
char *e;
int cnt, nb;
if (!pwcs || !s || n > INT_MAX)
if (!pwcs || n > INT_MAX) {
errno = EINVAL;
return (-1);
}
nb = n;
cnt = 0;
if (s == NULL) {
/* Convert and count only, do not store. */
while (*pwcs != L'\0') {
if (!sputrune(*pwcs++, buf, MB_LEN_MAX, &e)) {
errno = EILSEQ;
return (-1);
}
cnt += e - buf;
}
return (cnt);
}
/* Convert, store and count characters. */
nb = n;
while (nb > 0) {
if (*pwcs == 0) {
*s = 0;
break;
}
if (!sputrune(*pwcs++, s, nb, &e))
return (-1); /* encoding error */
if (!sputrune(*pwcs++, s, nb, &e)) {
errno = EILSEQ;
return (-1);
}
if (!e) /* too long */
return (cnt);
cnt += e - s;
nb -= e - s;
s = e;
}
return (cnt);
}