segatools/util/dprintf.c

86 lines
1.8 KiB
C

#ifndef NDEBUG
#include <windows.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include "util/dprintf.h"
static long dbg_buf_lock_init;
static CRITICAL_SECTION dbg_buf_lock;
static char dbg_buf[16384];
static size_t dbg_buf_pos;
void dprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
dprintfv(fmt, ap);
va_end(ap);
}
void dprintfv(const char *fmt, va_list ap)
{
long init;
/* Static constructors in C are difficult to do in a way that works under
both GCC and MSVC, so we have to use atomic ops to ensure that the
buffer mutex is correctly initialized instead. */
do {
init = InterlockedCompareExchange(&dbg_buf_lock_init, 0, 1);
if (init == 0) {
/* We won the init race, global variable is now set to 1, other
threads will spin until it becomes -1. */
InitializeCriticalSection(&dbg_buf_lock);
dbg_buf_lock_init = -1;
init = -1;
}
} while (init >= 0);
EnterCriticalSection(&dbg_buf_lock);
dbg_buf_pos += vsnprintf_s(
dbg_buf + dbg_buf_pos,
sizeof(dbg_buf) - dbg_buf_pos,
sizeof(dbg_buf) - dbg_buf_pos - 1,
fmt,
ap);
if (dbg_buf_pos + 1 > sizeof(dbg_buf)) {
abort();
}
if (strchr(dbg_buf, '\n') != NULL) {
OutputDebugStringA(dbg_buf);
dbg_buf_pos = 0;
dbg_buf[0] = '\0';
}
LeaveCriticalSection(&dbg_buf_lock);
}
void dwprintf(const wchar_t *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
dwprintfv(fmt, ap);
va_end(ap);
}
void dwprintfv(const wchar_t *fmt, va_list ap)
{
wchar_t msg[512];
_vsnwprintf_s(msg, _countof(msg), _countof(msg) - 1, fmt, ap);
OutputDebugStringW(msg);
}
#endif