BufferedPrint.c

00001 /*
00002  * Copyright (c) 2014-2015 ARM Limited. All rights reserved.
00003  * SPDX-License-Identifier: Apache-2.0
00004  * Licensed under the Apache License, Version 2.0 (the License); you may
00005  * not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  * http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
00012  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include <stdarg.h>
00018 #include <stdint.h>
00019 #include <stdio.h>
00020 #include <string.h>
00021 
00022 #include "mbed_error.h"
00023 
00024 size_t BufferedSerialThunk(void *buf_serial, const void *s, size_t length);
00025 
00026 int BufferedPrintfC(void *stream, int size, const char* format, va_list arg)
00027 {
00028     int r;
00029     char buffer[512];
00030     if (size >= 512) {
00031         return -1;
00032     }
00033     memset(buffer, 0, size);
00034     r = vsprintf(buffer, format, arg);
00035     // this may not hit the heap but should alert the user anyways
00036     if(r > (int32_t) size) {
00037         error("%s %d buffer overwrite (max_buf_size: %d exceeded: %d)!\r\n", __FILE__, __LINE__, size, r);
00038         return 0;
00039     }
00040     if ( r > 0 ) {
00041         BufferedSerialThunk(stream, buffer, r);
00042     }
00043     return r;
00044 }