vsprintf crashes in Mach-O

[Alfred Van Hoek]

The code below never failed, but currently in OSX-Carbon_MachO it  
always crashes when a dlog string is produced like: dlog("%s %i",  
"myPlugin message: err = ", status); where status is of type  
OSStatus. Whether I would use CW-10 or Xcode, MSL or BSD,  
respectively, the dylib crashes in vsprintf where it accesses  
__formatter. Simple strings work fine...

void dlog(char *format, ...)
{
        va_list args;
        char    buffer[255];
        va_start(args,format);

        strcpy(buffer + vsprintf(buffer,format,args), "");
        Str255 dst;
        
        CopyC2P(buffer, dst);
        
        #ifndef WIN32
                DebugStr(dst);
        #else
                OutputDebugString(buffer);
        #endif
        va_end(args);
}

Any other way to implement it? What is the mistake that now pops up?

Alfred

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