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Fix snprintf(NULL, 0, ...) undefined behavior.

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This commit is contained in:
Jonas 'Sortie' Termansen 2015-12-01 21:10:25 +01:00
parent 15fd58b6a0
commit 23810c1a48
4 changed files with 21 additions and 23 deletions
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2
libc/stdio/snprintf.cpp
View file

@ -18,7 +18,7 @@
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/snprintf.cpp
Prints a formatted string to a limited string.
Prints a formatted string to the supplied buffer.
*******************************************************************************/

2
libc/stdio/sprintf.cpp
View file

@ -18,7 +18,7 @@
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/sprintf.cpp
Prints a formatted string to a string.
Prints a formatted string to the supplied buffer.
*******************************************************************************/

38
libc/stdio/vsnprintf.cpp
View file

@ -1,6 +1,6 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
This file is part of the Sortix C Library.
@ -18,7 +18,7 @@
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.
Prints a formatted string to the supplied buffer.
*******************************************************************************/
@ -26,40 +26,38 @@
#include <stdio.h>
#include <string.h>
typedef struct vsnprintf_struct
struct vsnprintf
{
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)
static size_t vsnprintf_callback(void* ctx, const char* string, size_t length)
{
vsnprintf_t* info = (vsnprintf_t*) user;
if ( info->produced < info->size )
struct vsnprintf* info = (struct vsnprintf*) ctx;
if ( 1 <= info->size && info->written < info->size )
{
size_t available = info->size - info->produced;
size_t possible = (stringlen < available) ? stringlen : available;
memcpy(info->str + info->produced, string, possible);
size_t available = info->size - info->written;
size_t possible = length < available ? length : available;
memcpy(info->str + info->written, string, possible);
info->written += possible;
}
info->produced += stringlen;
return stringlen;
return length;
}
extern "C"
int vsnprintf(char* restrict str, size_t size, const char* restrict format,
int vsnprintf(char* restrict str,
size_t size,
const char* restrict format,
va_list list)
{
vsnprintf_t info;
struct vsnprintf info;
info.str = str;
info.size = size ? size-1 : 0;
info.produced = 0;
info.size = size ? size - 1 : 0;
info.written = 0;
int result = vcbprintf(&info, StringPrintCallback, format, list);
if ( size )
int result = vcbprintf(&info, vsnprintf_callback, format, list);
if ( 1 <= size )
info.str[info.written] = '\0';
return result;
}

2
libc/stdio/vsprintf.cpp
View file

@ -18,7 +18,7 @@
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/vsprintf.cpp
Prints a formatted string to a string.
Prints a formatted string to the supplied buffer.
*******************************************************************************/