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compat/vsnprintf: return number of bytes required on truncation.

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This conforms to C99, but requires Windows >= XP.
This commit is contained in:
Ronald S. Bultje 2012-09-14 16:03:25 -04:00 committed by Derek Buitenhuis
parent e1b4496040
commit 663c21d4ac
1 changed files with 6 additions and 3 deletions
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9
compat/msvcrt/snprintf.c
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@ -43,9 +43,10 @@ int avpriv_vsnprintf(char *s, size_t n, const char *fmt,
va_list ap)
{
int ret;
va_list ap_copy;
if (n == 0)
return 0;
return _vscprintf(fmt, ap);
else if (n > INT_MAX)
return AVERROR(EOVERFLOW);
@ -56,9 +57,11 @@ int avpriv_vsnprintf(char *s, size_t n, const char *fmt,
* _snprintf/_vsnprintf() to workaround this problem.
* See http://msdn.microsoft.com/en-us/library/1kt27hek(v=vs.80).aspx */
memset(s, 0, n);
ret = _vsnprintf(s, n - 1, fmt, ap);
va_copy(ap_copy, ap);
ret = _vsnprintf(s, n - 1, fmt, ap_copy);
va_end(ap_copy);
if (ret == -1)
ret = n;
ret = _vscprintf(fmt, ap);
return ret;
}