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fix off-by-one, pointed out by enami-san, thanks!

This commit is contained in:
tnozaki 2010-09-27 16:50:13 +00:00
parent 92ea7baff6
commit 6d102a3218
1 changed files with 9 additions and 7 deletions
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16
lib/libc/stdio/fmemopen.c
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@ -1,4 +1,4 @@
/* $NetBSD: fmemopen.c,v 1.3 2010/09/25 14:00:30 tron Exp $ */
/* $NetBSD: fmemopen.c,v 1.4 2010/09/27 16:50:13 tnozaki Exp $ */
/*-
* Copyright (c)2007, 2010 Takehiko NOZAKI,
@ -29,7 +29,7 @@
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fmemopen.c,v 1.3 2010/09/25 14:00:30 tron Exp $");
__RCSID("$NetBSD: fmemopen.c,v 1.4 2010/09/27 16:50:13 tnozaki Exp $");
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
@ -70,7 +70,7 @@ static int
fmemopen_write(void *cookie, const char *buf, int nbytes)
{
struct fmemopen_cookie *p;
char *s, *t;
char *s;
_DIAGASSERT(cookie != NULL);
_DIAGASSERT(buf != NULL && nbytes > 0);
@ -79,16 +79,18 @@ fmemopen_write(void *cookie, const char *buf, int nbytes)
if (p->cur >= p->tail)
return 0;
s = p->cur;
t = p->tail - 1;
do {
if (p->cur == t) {
if (*buf == '\0')
*p->cur++ = *buf++;
if (p->cur == p->tail - 1) {
if (*buf == '\0') {
*p->cur++ = '\0';
goto ok;
}
break;
}
*p->cur++ = *buf++;
} while (--nbytes > 0);
*p->cur = '\0';
ok:
if (p->cur > p->eob)
p->eob = p->cur;