linux-kernel - Re: [PATCH v3 1/2] printk: console: Create console= parser that supports named options

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Message-ID: <YxYLlHYyttowJLSy@chrisdown.name>
Date:   Mon, 5 Sep 2022 15:45:40 +0100
From:   Chris Down <chris@...isdown.name>
To:     Petr Mladek <pmladek@...e.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>, kernel-team@...com
Subject: Re: [PATCH v3 1/2] printk: console: Create console= parser that
 supports named options

Chris Down writes:
>[code]

Er, forgot to update that for the one used in the test:

---

#define _DEFAULT_SOURCE

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <ctype.h>
#include <stdlib.h>

#define clamp(a, b, c) (a)
#define CON_LOGLEVEL 128

struct console_cmdline {
	char *options;
	int level;
	short flags;
};

static void parse_console_cmdline_options(struct console_cmdline *c,
					  char *options)
{
	bool seen_serial_opts = false;
	char *key;

	while ((key = strsep(&options, ",")) != NULL) {
		char *value;

		value = strchr(key, ':');
		if (value)
			*(value++) = '\0';

		if (strcmp(key, "loglevel") == 0 && value &&
		    isdigit(value[0]) && strlen(value) == 1) {
			c->level = clamp(value[0] - '0', LOGLEVEL_EMERG,
					 LOGLEVEL_DEBUG + 1);
			c->flags |= CON_LOGLEVEL;
			continue;
		}

		if (!seen_serial_opts && isdigit(key[0]) && !value) {
			seen_serial_opts = true;
			c->options = key;
			continue;
		}

		fprintf(stderr,
			"ignoring invalid console option: '%s%s%s'\n", key,
			value ? ":" : "", value ?: "");
	}
}

int main(int argc, char *argv[])
{
	struct console_cmdline con = { 0 };

	if (argc != 2)
		return EXIT_FAILURE;

	parse_console_cmdline_options(&con, argv[1]);
	printf("options: %s\n", con.options);
	printf("level: %d\n", con.level);
	printf("level set: %d\n", !!(con.flags & CON_LOGLEVEL));
}