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Assert that fmt != NULL before calling vsnprintf (#1969)

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In the case of Visual Studio 15.6 + Windows SDK 10.0, vsnprintf() with NULL format string appears to corrupt the stack...
This commit is contained in:
OswaldHurlem
2018-07-26 13:26:50 -07:00
committed by omar
parent dd0d5debef
commit 84183f5bb6
1 changed files with 2 additions and 0 deletions
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2
imgui.cpp
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@@ -1259,6 +1259,7 @@ static const char* ImAtoi(const char* src, TYPE* output)
#ifndef IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS
int ImFormatString(char* buf, size_t buf_size, const char* fmt, ...)
{
IM_ASSERT(fmt != NULL);
va_list args;
va_start(args, fmt);
int w = vsnprintf(buf, buf_size, fmt, args);
@@ -1273,6 +1274,7 @@ int ImFormatString(char* buf, size_t buf_size, const char* fmt, ...)
int ImFormatStringV(char* buf, size_t buf_size, const char* fmt, va_list args)
{
IM_ASSERT(fmt != NULL);
int w = vsnprintf(buf, buf_size, fmt, args);
if (buf == NULL)
return w;