nes-proj/os/lib/dbg-io/snprintf.c

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/*
* Copyright (c) 2009, Simon Berg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
#include <stdio.h>
#include <strformat.h>
#include <string.h>
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/*---------------------------------------------------------------------------*/
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struct fmt_buffer {
char *pos;
size_t left;
};
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/*---------------------------------------------------------------------------*/
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static strformat_result
buffer_str(void *user_data, const char *data, unsigned int len)
{
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struct fmt_buffer *buffer = (struct fmt_buffer *)user_data;
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if(len >= buffer->left) {
len = buffer->left;
len--;
}
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memcpy(buffer->pos, data, len);
buffer->pos += len;
buffer->left -= len;
return STRFORMAT_OK;
}
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/*---------------------------------------------------------------------------*/
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int
snprintf(char *str, size_t size, const char *format, ...)
{
int res;
va_list ap;
va_start(ap, format);
res = vsnprintf(str, size, format, ap);
va_end(ap);
return res;
}
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/*---------------------------------------------------------------------------*/
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int
vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
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struct fmt_buffer buffer;
strformat_context_t ctxt;
int res;
ctxt.write_str = buffer_str;
ctxt.user_data = &buffer;
buffer.pos = str;
buffer.left = size;
res = format_str_v(&ctxt, format, ap);
*buffer.pos = '\0';
return res;
}
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/*---------------------------------------------------------------------------*/