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35c35493b0
strncmp(str, const, len) is error-prone because len is easy to have typo. An example is the hard-coded len has counting error or sizeof(const) forgets - 1. So we prefer using newly introduced str_has_prefix() to substitute such strncmp() to make code better. Link: http://lkml.kernel.org/r/20190809071034.17279-1-hslester96@gmail.com Cc: "Steven Rostedt" <rostedt@goodmis.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Chuhong Yuan <hslester96@gmail.com> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> [pmladek@suse.com: Slightly updated and reformatted the commit message.] Signed-off-by: Petr Mladek <pmladek@suse.com>
58 lines
1 KiB
C
58 lines
1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/console.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include "console_cmdline.h"
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#include "braille.h"
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int _braille_console_setup(char **str, char **brl_options)
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{
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size_t len;
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len = str_has_prefix(*str, "brl,");
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if (len) {
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*brl_options = "";
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*str += len;
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return 0;
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}
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len = str_has_prefix(*str, "brl=");
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if (len) {
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*brl_options = *str + len;
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*str = strchr(*brl_options, ',');
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if (!*str) {
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pr_err("need port name after brl=\n");
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return -EINVAL;
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}
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*((*str)++) = 0;
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}
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return 0;
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}
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int
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_braille_register_console(struct console *console, struct console_cmdline *c)
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{
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int rtn = 0;
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if (c->brl_options) {
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console->flags |= CON_BRL;
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rtn = braille_register_console(console, c->index, c->options,
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c->brl_options);
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}
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return rtn;
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}
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int
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_braille_unregister_console(struct console *console)
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{
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if (console->flags & CON_BRL)
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return braille_unregister_console(console);
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return 0;
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}
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