lib/utils/stdout_helpers: Make mp_hal_stdout_tx_strn_cooked efficient.
To reduce the number of calls to mp_hal_stdout_tx_strn and improve the overall throughput of printing data. This implementation is taken from ports/stm32/mphalport.c. Signed-off-by: Damien George <damien@micropython.org>
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lib/utils
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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2021 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <unistd.h>
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#include "py/mpconfig.h"
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#include "py/mphal.h"
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/*
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*/
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// Send "cooked" string of given length, where every occurrence of
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// LF character is replaced with CR LF.
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// LF character is replaced with CR LF ("\n" is converted to "\r\n").
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// This is an optimised version to reduce the number of calls made
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// to mp_hal_stdout_tx_strn.
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void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
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const char *last = str;
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while (len--) {
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if (*str == '\n') {
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mp_hal_stdout_tx_strn("\r", 1);
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if (str > last) {
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mp_hal_stdout_tx_strn(last, str - last);
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}
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mp_hal_stdout_tx_strn("\r\n", 2);
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++str;
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last = str;
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} else {
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++str;
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}
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mp_hal_stdout_tx_strn(str++, 1);
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}
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if (str > last) {
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mp_hal_stdout_tx_strn(last, str - last);
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}
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}
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