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https://github.com/apache/nuttx.git
synced 2026-08-20 04:58:28 +00:00
c6591c0f49
modify the prototype of up_putc(): remove the return value
The architecture code does not care about the return value of up_putc(), so removing it saves two statements:
Before: After:
de4c: e52de004 push {lr} @ (str lr, [sp, #-4]!) | de4c: e52de004 push {lr} @ (str lr, [sp, #-4]!)
de50: e24dd014 sub sp, sp, #20 | de50: e24dd014 sub sp, sp, #20
de54: e58d0004 str r0, [sp, #4] | de54: e58d0004 str r0, [sp, #4]
de58: e30030f8 movw r3, #248 @ 0xf8 | de58: e30030f8 movw r3, #248 @ 0xf8
de5c: e3423000 movt r3, #8192 @ 0x2000 | de5c: e3423000 movt r3, #8192 @ 0x2000
de60: e58d300c str r3, [sp, #12] | de60: e58d300c str r3, [sp, #12]
de64: e59d1004 ldr r1, [sp, #4] | de64: e59d1004 ldr r1, [sp, #4]
de68: e59d000c ldr r0, [sp, #12] | de68: e59d000c ldr r0, [sp, #12]
de6c: ebfffe66 bl d80c <pl011_putc> | de6c: ebfffe66 bl d80c <pl011_putc>
de70: e59d3004 ldr r3, [sp, #4] | de70: e28dd014 add sp, sp, #20
de74: e1a00003 mov r0, r3 | de74: e49df004 pop {pc} @ (ldr pc, [sp], #4)
de78: e28dd014 add sp, sp, #20 |
de7c: e49df004 pop {pc} @ (ldr pc, [sp], #4) |
Signed-off-by: chao an <anchao@lixiang.com>
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_lowoutstream.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_ARCH_LOWPUTC
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#include <stdio.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include "libc.h"
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/****************************************************************************
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* Private Functions Prototypes
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****************************************************************************/
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static void lowoutstream_putc(FAR struct lib_outstream_s *self, int ch);
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static int lowoutstream_puts(FAR struct lib_outstream_s *self,
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FAR const void *buf, int len);
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/****************************************************************************
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* Public Data
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****************************************************************************/
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struct lib_outstream_s g_lowoutstream =
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{
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0,
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lowoutstream_putc,
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lowoutstream_puts,
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lib_noflush
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lowoutstream_putc
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****************************************************************************/
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static void lowoutstream_putc(FAR struct lib_outstream_s *self, int ch)
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{
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DEBUGASSERT(self);
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up_putc(ch);
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if (ch != EOF)
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{
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self->nput++;
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}
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}
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/****************************************************************************
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* Name: lowoutstream_puts
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****************************************************************************/
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static int lowoutstream_puts(FAR struct lib_outstream_s *self,
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FAR const void *buf, int len)
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{
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DEBUGASSERT(self);
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self->nput += len;
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up_nputs(buf, len);
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return len;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_lowoutstream
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*
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* Description:
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* Initializes a stream for use with low-level, architecture-specific I/O.
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*
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* Input Parameters:
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* stream - User allocated, uninitialized instance of struct
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* lib_lowoutstream_s to be initialized.
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*
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* Returned Value:
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* None (User allocated instance initialized).
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*
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****************************************************************************/
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void lib_lowoutstream(FAR struct lib_outstream_s *stream)
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{
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stream->putc = lowoutstream_putc;
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stream->puts = lowoutstream_puts;
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stream->flush = lib_noflush;
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stream->nput = 0;
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}
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#endif /* CONFIG_ARCH_LOWPUTC */
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