66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The Sortix C Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
stdio/vsnprintf.cpp
|
|
Prints a formatted string to a limited string.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
typedef struct vsnprintf_struct
|
|
{
|
|
char* str;
|
|
size_t size;
|
|
size_t produced;
|
|
size_t written;
|
|
} vsnprintf_t;
|
|
|
|
static size_t StringPrintCallback(void* user, const char* string,
|
|
size_t stringlen)
|
|
{
|
|
vsnprintf_t* info = (vsnprintf_t*) user;
|
|
if ( info->produced < info->size )
|
|
{
|
|
size_t available = info->size - info->produced;
|
|
size_t possible = (stringlen < available) ? stringlen : available;
|
|
memcpy(info->str + info->produced, string, possible);
|
|
info->written += possible;
|
|
}
|
|
info->produced += stringlen;
|
|
return stringlen;
|
|
}
|
|
|
|
extern "C"
|
|
int vsnprintf(char* restrict str, size_t size, const char* restrict format,
|
|
va_list list)
|
|
{
|
|
vsnprintf_t info;
|
|
info.str = str;
|
|
info.size = size ? size-1 : 0;
|
|
info.produced = 0;
|
|
info.written = 0;
|
|
int result = vcbprintf(&info, StringPrintCallback, format, list);
|
|
if ( size )
|
|
info.str[info.written] = '\0';
|
|
return result;
|
|
}
|