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/* Print output of stream to given obstack.
Copyright (C) 1996-2023 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/>. */
#include <assert.h>
#include <math_ldbl_opt.h>
#include <obstack.h>
#include <printf.h>
#include <stdarg.h>
#include <printf_buffer.h>
struct __printf_buffer_obstack
{
struct __printf_buffer base;
struct obstack *obstack;
/* obstack_1grow is called for compatibility reasons. This needs
one extra character, and this is the backing store for it. */
char ch;
};
void
__printf_buffer_flush_obstack (struct __printf_buffer_obstack *buf)
{
/* About to switch buffers, so record the bytes written so far. */
buf->base.written += buf->base.write_ptr - buf->base.write_base;
if (buf->base.write_ptr == &buf->ch + 1)
{
/* Errors are reported via a callback mechanism (presumably for
process termination). */
obstack_1grow (buf->obstack, buf->ch);
buf->base.write_base = obstack_next_free (buf->obstack);
buf->base.write_ptr = buf->base.write_base;
size_t size = obstack_room (buf->obstack);
buf->base.write_end = buf->base.write_ptr + size;
/* Reserve the space on the obstack size. */
obstack_blank_fast (buf->obstack, size);
}
else
{
/* Obtain the extra character. */
buf->base.write_base = &buf->ch;
buf->base.write_ptr = &buf->ch;
buf->base.write_end = &buf->ch + 1;
}
}
int
__obstack_vprintf_internal (struct obstack *obstack, const char *format,
va_list args, unsigned int mode_flags)
{
/* Legacy setup code for compatibility. */
size_t room = obstack_room (obstack);
size_t size = obstack_object_size (obstack) + room;
if (size == 0)
{
/* Get more memory. */
obstack_make_room (obstack, 64);
/* Recompute how much room we have. */
room = obstack_room (obstack);
size = room;
assert (size != 0);
}
struct __printf_buffer_obstack buf;
{
/* The obstack write location might be in the middle of an object. */
char *ptr = obstack_next_free (obstack);
char *end = obstack_base (obstack) + size;
__printf_buffer_init (&buf.base, ptr, end - ptr,
__printf_buffer_mode_obstack);
}
buf.obstack = obstack;
/* Now allocate the rest of the current chunk. */
obstack_blank_fast (obstack, room);
__printf_buffer (&buf.base, format, args, mode_flags);
if (buf.base.write_ptr == &buf.ch + 1)
/* buf.ch is in use. Put it into the obstack. */
obstack_1grow (buf.obstack, buf.ch);
else if (buf.base.write_ptr != &buf.ch)
/* Shrink the buffer to the space we really currently need. */
obstack_blank_fast (buf.obstack, buf.base.write_ptr - buf.base.write_end);
return __printf_buffer_done (&buf.base);
}
int
__obstack_vprintf (struct obstack *obstack, const char *format, va_list ap)
{
return __obstack_vprintf_internal (obstack, format, ap, 0);
}
ldbl_weak_alias (__obstack_vprintf, obstack_vprintf)
int
__obstack_printf (struct obstack *obstack, const char *format, ...)
{
int result;
va_list ap;
va_start (ap, format);
result = __obstack_vprintf_internal (obstack, format, ap, 0);
va_end (ap);
return result;
}
ldbl_weak_alias (__obstack_printf, obstack_printf)
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