mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
107 lines
3.7 KiB
C
107 lines
3.7 KiB
C
/* Copyright (C) 1994-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU 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 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU 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 GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include "libioP.h"
|
|
|
|
#include <array_length.h>
|
|
#include <printf.h>
|
|
#include <printf_buffer.h>
|
|
|
|
void
|
|
__printf_buffer_flush_snprintf (struct __printf_buffer_snprintf *buf)
|
|
{
|
|
/* Record the bytes written so far, before switching buffers. */
|
|
buf->base.written += buf->base.write_ptr - buf->base.write_base;
|
|
|
|
if (buf->base.write_base != buf->discard)
|
|
{
|
|
/* We just finished writing the caller-supplied buffer. Force
|
|
NUL termination if the string length is not zero. */
|
|
if (buf->base.write_base != buf->base.write_end)
|
|
buf->base.write_end[-1] = '\0';
|
|
|
|
|
|
/* Switch to the discard buffer. */
|
|
buf->base.write_base = buf->discard;
|
|
buf->base.write_ptr = buf->discard;
|
|
buf->base.write_end = array_end (buf->discard);
|
|
}
|
|
|
|
buf->base.write_base = buf->discard;
|
|
buf->base.write_ptr = buf->discard;
|
|
}
|
|
|
|
void
|
|
__printf_buffer_snprintf_init (struct __printf_buffer_snprintf *buf,
|
|
char *buffer, size_t length)
|
|
{
|
|
__printf_buffer_init (&buf->base, buffer, length,
|
|
__printf_buffer_mode_snprintf);
|
|
if (length > 0)
|
|
/* Historic behavior for trivially overlapping buffers (checked by
|
|
the test suite). */
|
|
*buffer = '\0';
|
|
}
|
|
|
|
int
|
|
__printf_buffer_snprintf_done (struct __printf_buffer_snprintf *buf)
|
|
{
|
|
/* NB: Do not check for buf->base.fail here. Write the null
|
|
terminator even in case of errors. */
|
|
|
|
if (buf->base.write_ptr < buf->base.write_end)
|
|
*buf->base.write_ptr = '\0';
|
|
else if (buf->base.write_ptr > buf->base.write_base)
|
|
/* If write_ptr == write_base, nothing has been written. No null
|
|
termination is needed because of the early truncation in
|
|
__printf_buffer_snprintf_init (the historic behavior).
|
|
|
|
We might also be at the start of the discard buffer, but in
|
|
this case __printf_buffer_flush_snprintf has already written
|
|
the NUL terminator. */
|
|
buf->base.write_ptr[-1] = '\0';
|
|
|
|
return __printf_buffer_done (&buf->base);
|
|
}
|
|
|
|
int
|
|
__vsnprintf_internal (char *string, size_t maxlen, const char *format,
|
|
va_list args, unsigned int mode_flags)
|
|
{
|
|
struct __printf_buffer_snprintf buf;
|
|
__printf_buffer_snprintf_init (&buf, string, maxlen);
|
|
__printf_buffer (&buf.base, format, args, mode_flags);
|
|
return __printf_buffer_snprintf_done (&buf);
|
|
}
|
|
|
|
int
|
|
___vsnprintf (char *string, size_t maxlen, const char *format, va_list args)
|
|
{
|
|
return __vsnprintf_internal (string, maxlen, format, args, 0);
|
|
}
|
|
ldbl_weak_alias (___vsnprintf, __vsnprintf)
|
|
ldbl_weak_alias (___vsnprintf, vsnprintf)
|