i3/src/log.c

/*
 * vim:ts=8:expandtab
 *
 * i3 - an improved dynamic tiling window manager
 *
 * © 2009 Michael Stapelberg and contributors
 *
 * See file LICENSE for license information.
 *
 * src/log.c: handles the setting of loglevels, contains the logging functions.
 *
 */
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>

#include "util.h"
#include "log.h"

/* loglevels.h is autogenerated at make time */
#include "loglevels.h"

static uint64_t loglevel = 0;
static bool verbose = true;

/**
 * Set verbosity of i3. If verbose is set to true, informative messages will
 * be printed to stdout. If verbose is set to false, only errors will be
 * printed.
 *
 */
void set_verbosity(bool _verbose) {
        verbose = _verbose;
}

/**
 * Enables the given loglevel.
 *
 */
void add_loglevel(const char *level) {
	/* Handle the special loglevel "all" */
	if (strcasecmp(level, "all") == 0) {
		loglevel = UINT64_MAX;
		return;
	}

	for (int i = 0; i < sizeof(loglevels) / sizeof(char*); i++) {
		if (strcasecmp(loglevels[i], level) != 0)
			continue;

		/* The position in the array (plus one) is the amount of times
		 * which we need to shift 1 to the left to get our bitmask for
		 * the specific loglevel. */
		loglevel |= (1 << (i+1));
		break;
	}
}

/*
 * Logs the given message to stdout while prefixing the current time to it.
 * This is to be called by *LOG() which includes filename/linenumber/function.
 *
 */
void vlog(char *fmt, va_list args) {
        char timebuf[64];

        /* Get current time */
        time_t t = time(NULL);
        /* Convert time to local time (determined by the locale) */
        struct tm *tmp = localtime(&t);
        /* Generate time prefix */
        strftime(timebuf, sizeof(timebuf), "%x %X - ", tmp);
        printf("%s", timebuf);
        vprintf(fmt, args);
}

/**
 * Logs the given message to stdout while prefixing the current time to it,
 * but only if verbose mode is activated.
 *
 */
void verboselog(char *fmt, ...) {
        va_list args;

	if (!verbose)
		return;

        va_start(args, fmt);
        vlog(fmt, args);
        va_end(args);
}

/**
 * Logs the given message to stdout while prefixing the current time to it.
 *
 */
void errorlog(char *fmt, ...) {
        va_list args;

        va_start(args, fmt);
        vlog(fmt, args);
        va_end(args);
}

/*
 * Logs the given message to stdout while prefixing the current time to it,
 * but only if the corresponding debug loglevel was activated.
 * This is to be called by DLOG() which includes filename/linenumber
 *
 */
void debuglog(uint64_t lev, char *fmt, ...) {
	va_list args;

	if ((loglevel & lev) == 0)
		return;

        va_start(args, fmt);
        vlog(fmt, args);
        va_end(args);
}