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