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Use the heap instead of the stack to store temporary multibyte string

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buffers; this is slower but safer for threaded programs where threads
often have relatively low stack size limits.
This commit is contained in:
Tim J. Robbins 2002-09-15 08:06:17 +00:00
parent 59c25132c2
commit 528bebffb1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103337
1 changed files with 28 additions and 10 deletions
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38
lib/libc/locale/wcsftime.c
View file

@ -27,6 +27,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>
@ -51,8 +52,11 @@ wcsftime(wchar_t * __restrict wcs, size_t maxsize,
{
static const mbstate_t initial;
mbstate_t state;
char *dst, *sformat;
char *dst, *dstp, *sformat;
size_t n, sflen;
int sverrno;
sformat = dst = NULL;
/*
* Convert the supplied format string to a multibyte representation
@ -61,8 +65,9 @@ wcsftime(wchar_t * __restrict wcs, size_t maxsize,
state = initial;
sflen = wcsrtombs(NULL, &format, 0, &state);
if (sflen == (size_t)-1)
return (0);
sformat = alloca(sflen + 1);
goto error;
if ((sformat = malloc(sflen + 1)) == NULL)
goto error;
state = initial;
wcsrtombs(sformat, &format, sflen + 1, &state);
@ -72,16 +77,29 @@ wcsftime(wchar_t * __restrict wcs, size_t maxsize,
* Then, copy and convert the result back into wide characters in
* the caller's buffer.
*/
if (SIZE_T_MAX / MB_CUR_MAX <= maxsize)
if (SIZE_T_MAX / MB_CUR_MAX <= maxsize) {
/* maxsize is prepostorously large - avoid int. overflow. */
return (0);
dst = alloca(maxsize * MB_CUR_MAX);
errno = EINVAL;
goto error;
}
if ((dst = malloc(maxsize * MB_CUR_MAX)) == NULL)
goto error;
if (strftime(dst, maxsize, sformat, timeptr) == 0)
return (0);
goto error;
state = initial;
n = mbsrtowcs(wcs, (const char **)&dst, maxsize, &state);
if (n == (size_t)-2 || n == (size_t)-1 || dst != NULL)
return (0);
dstp = dst;
n = mbsrtowcs(wcs, (const char **)&dstp, maxsize, &state);
if (n == (size_t)-2 || n == (size_t)-1 || dstp != NULL)
goto error;
free(sformat);
free(dst);
return (n);
error:
sverrno = errno;
free(sformat);
free(dst);
errno = sverrno;
return (0);
}