tesseract/ccutil/tprintf.cpp

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/**********************************************************************
2017-07-03 05:35:47 +08:00
* File: tprintf.cpp
* Description: Trace version of printf - portable between UX and NT
* Author: Phil Cheatle
* Created: Wed Jun 28 15:01:15 BST 1995
*
* (C) Copyright 1995, Hewlett-Packard Ltd.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
**********************************************************************/
// Include automatically generated configuration file if running autoconf.
#ifdef HAVE_CONFIG_H
#include "config_auto.h"
#endif
#include <stdio.h>
#include <stdarg.h>
#include "ccutil.h"
#include "params.h"
#include "strngs.h"
#include "tprintf.h"
#define MAX_MSG_LEN 65536
#define EXTERN
// Since tprintf is protected by a mutex, these parameters can remain global.
DLLSYM STRING_VAR(debug_file, "", "File to send tprintf output to");
DLLSYM void
tprintf_internal( // Trace printf
const char *format, ... // Message
) {
tesseract::tprintfMutex.Lock();
va_list args; // variable args
static FILE *debugfp = NULL; // debug file
// debug window
inT32 offset = 0; // into message
static char msg[MAX_MSG_LEN + 1];
va_start(args, format); // variable list
// Format into msg
#ifdef _WIN32
offset += _vsnprintf(msg + offset, MAX_MSG_LEN - offset, format, args);
if (strcmp(debug_file.string(), "/dev/null") == 0)
debug_file.set_value("nul");
#else
offset += vsnprintf(msg + offset, MAX_MSG_LEN - offset, format, args);
#endif
va_end(args);
if (debugfp == NULL && strlen(debug_file.string()) > 0) {
debugfp = fopen(debug_file.string(), "wb");
} else if (debugfp != NULL && strlen(debug_file.string()) == 0) {
fclose(debugfp);
debugfp = NULL;
}
if (debugfp != NULL)
fprintf(debugfp, "%s", msg);
else
fprintf(stderr, "%s", msg);
tesseract::tprintfMutex.Unlock();
}