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When size is 1 should just null terminate the string. The dummy variable

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is made an array of two, to explicitly avoid stack corruption due to
null-terminating (which is doesn't actually happen due to stack alignment
padding).

Submitted by: Ed Moy <emoy@apple.com>
Obtained from: Apple Computer, Inc.
This commit is contained in:
Jordan K. Hubbard 2003-07-02 07:08:44 +00:00
parent f493d09ae7
commit b0a06af596
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=117147
1 changed files with 5 additions and 3 deletions
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8
lib/libc/stdio/vsnprintf.c
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@ -50,7 +50,7 @@ vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
{
size_t on;
int ret;
char dummy;
char dummy[2];
FILE f;
struct __sFILEX ext;
@ -61,8 +61,10 @@ vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
n = INT_MAX;
/* Stdio internals do not deal correctly with zero length buffer */
if (n == 0) {
str = &dummy;
n = 1;
if (on > 0)
*str = '\0';
str = dummy;
n = 1;
}
f._file = -1;
f._flags = __SWR | __SSTR;