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125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/* Print output of stream to given obstack.
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Copyright (C) 1996-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <math_ldbl_opt.h>
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#include <obstack.h>
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#include <printf.h>
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#include <stdarg.h>
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#include <printf_buffer.h>
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struct __printf_buffer_obstack
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{
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struct __printf_buffer base;
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struct obstack *obstack;
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/* obstack_1grow is called for compatibility reasons. This needs
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one extra character, and this is the backing store for it. */
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char ch;
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};
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void
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__printf_buffer_flush_obstack (struct __printf_buffer_obstack *buf)
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{
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/* About to switch buffers, so record the bytes written so far. */
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buf->base.written += buf->base.write_ptr - buf->base.write_base;
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if (buf->base.write_ptr == &buf->ch + 1)
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{
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/* Errors are reported via a callback mechanism (presumably for
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process termination). */
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obstack_1grow (buf->obstack, buf->ch);
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buf->base.write_base = obstack_next_free (buf->obstack);
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buf->base.write_ptr = buf->base.write_base;
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size_t size = obstack_room (buf->obstack);
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buf->base.write_end = buf->base.write_ptr + size;
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/* Reserve the space on the obstack size. */
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obstack_blank_fast (buf->obstack, size);
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}
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else
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{
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/* Obtain the extra character. */
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buf->base.write_base = &buf->ch;
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buf->base.write_ptr = &buf->ch;
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buf->base.write_end = &buf->ch + 1;
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}
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}
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int
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__obstack_vprintf_internal (struct obstack *obstack, const char *format,
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va_list args, unsigned int mode_flags)
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{
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/* Legacy setup code for compatibility. */
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size_t room = obstack_room (obstack);
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size_t size = obstack_object_size (obstack) + room;
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if (size == 0)
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{
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/* Get more memory. */
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obstack_make_room (obstack, 64);
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/* Recompute how much room we have. */
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room = obstack_room (obstack);
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size = room;
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assert (size != 0);
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}
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struct __printf_buffer_obstack buf;
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{
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/* The obstack write location might be in the middle of an object. */
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char *ptr = obstack_next_free (obstack);
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char *end = obstack_base (obstack) + size;
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__printf_buffer_init (&buf.base, ptr, end - ptr,
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__printf_buffer_mode_obstack);
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}
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buf.obstack = obstack;
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/* Now allocate the rest of the current chunk. */
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obstack_blank_fast (obstack, room);
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__printf_buffer (&buf.base, format, args, mode_flags);
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if (buf.base.write_ptr == &buf.ch + 1)
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/* buf.ch is in use. Put it into the obstack. */
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obstack_1grow (buf.obstack, buf.ch);
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else if (buf.base.write_ptr != &buf.ch)
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/* Shrink the buffer to the space we really currently need. */
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obstack_blank_fast (buf.obstack, buf.base.write_ptr - buf.base.write_end);
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return __printf_buffer_done (&buf.base);
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}
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int
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__obstack_vprintf (struct obstack *obstack, const char *format, va_list ap)
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{
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return __obstack_vprintf_internal (obstack, format, ap, 0);
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}
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ldbl_weak_alias (__obstack_vprintf, obstack_vprintf)
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int
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__obstack_printf (struct obstack *obstack, const char *format, ...)
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{
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int result;
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va_list ap;
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va_start (ap, format);
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result = __obstack_vprintf_internal (obstack, format, ap, 0);
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va_end (ap);
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return result;
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}
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ldbl_weak_alias (__obstack_printf, obstack_printf)
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