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