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sortix--sortix/libc/sprint.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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/>.
sprint.cpp
Provides the stubs for the sprintf family of functions.
*******************************************************************************/
#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.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;
vprintf_callback(StringPrintCallback, &info, format, list);
if ( size ) { info.str[info.written] = '\0'; }
return (int) info.produced;
}
extern "C" int snprintf(char* restrict str, size_t size, const char* restrict format, ...)
{
va_list list;
va_start(list, format);
int result = vsnprintf(str, size, format, list);
va_end(list);
return result;
}
extern "C" int vsprintf(char* restrict str, const char* restrict format, va_list list)
{
return vsnprintf(str, SIZE_MAX, format, list);
}
extern "C" int sprintf(char* restrict str, const char* restrict format, ...)
{
va_list list;
va_start(list, format);
int result = vsprintf(str, format, list);
va_end(list);
return result;
}