mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
|
|
|
|
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 the supplied buffer.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
struct vsnprintf
|
|
{
|
|
char* str;
|
|
size_t size;
|
|
size_t written;
|
|
};
|
|
|
|
static size_t vsnprintf_callback(void* ctx, const char* string, size_t length)
|
|
{
|
|
struct vsnprintf* info = (struct vsnprintf*) ctx;
|
|
if ( 1 <= info->size && info->written < info->size )
|
|
{
|
|
size_t available = info->size - info->written;
|
|
size_t possible = length < available ? length : available;
|
|
memcpy(info->str + info->written, string, possible);
|
|
info->written += possible;
|
|
}
|
|
return length;
|
|
}
|
|
|
|
extern "C"
|
|
int vsnprintf(char* restrict str,
|
|
size_t size,
|
|
const char* restrict format,
|
|
va_list list)
|
|
{
|
|
struct vsnprintf info;
|
|
info.str = str;
|
|
info.size = size ? size - 1 : 0;
|
|
info.written = 0;
|
|
int result = vcbprintf(&info, vsnprintf_callback, format, list);
|
|
if ( 1 <= size )
|
|
info.str[info.written] = '\0';
|
|
return result;
|
|
}
|