source: MondoRescue/branches/3.2/mondo/src/lib/mr_msg.c@ 3509

/*
 * $Id$
 *
 * Code (c)2006 Bruno Cornec <bruno@mondorescue.org>
 *
 *     Main file of mr_msg : a very small and simple
 *     library for messages management
 *
 * Provided under the GPLv2
 */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>

static int mr_loglevel = 0;
static char *mr_logfile = NULL;
static FILE *mr_flog = NULL;

/*
 * This function is in the lowest part of the tree
 * It should not depend on any other function of the mr lib 
 */

/* Function allowing to change loglevel after init */
void mr_msg_loglevel(int loglevel) {

    mr_loglevel = loglevel;
}

/* Cleanup function for messages */
void mr_msg_close(void) {

    int res = 0;
    if ((res = fclose(mr_flog)) != 0) {
        fprintf(stderr,"Unable to close %s\n",mr_logfile);
    }
    free(mr_logfile);

    mr_logfile = NULL;
    mr_loglevel = 0;
    mr_flog = NULL;
return;
}

/* Initialization function for messages */
void mr_msg_init(const char *logfile, int loglevel) {
    if (asprintf(&mr_logfile, "%s", logfile) == -1) {
        fprintf(stderr,"Unable to alloc memory\n");
        fprintf(stderr,"Logging desactivated\n");
        mr_msg_close();
    }
    if (fopen(mr_logfile, "r") == NULL) {
        /*  log file doesn't exist yet, so creating it */
        if ((mr_flog = fopen(mr_logfile, "w")) == NULL) {
            fprintf(stderr,"Unable to write to %s\n",mr_logfile);
            fprintf(stderr,"Logging desactivated\n");
            mr_msg_close();
        }
    } else {
        /*  If it exists try to append to it */
        if ((mr_flog = fopen(mr_logfile, "a")) == NULL) {
            fprintf(stderr,"Unable to write to %s\n",mr_logfile);
            fprintf(stderr,"Logging desactivated\n");
            mr_msg_close();
        }
    }
    mr_msg_loglevel(loglevel);
}

/*
 * Function that log a message. Not called directly 
 * but through other functions
 * fmt needs to be just before ...
 * level should be >0 to have file and line printed (real debug)
 * If =0 it's an informative log message
 */
void mr_msg_int(int level, int line, const char *file, char *function, const char *fmt, ...) {

    va_list args;

    if ((mr_logfile == NULL) || (mr_flog == NULL)) {
        return;
    }

    if (level <= mr_loglevel) {
        if (level > 0) {
            fprintf(mr_flog, "DBG%d: ", level);
            fprintf(mr_flog, "%s->%s#%d: ", file, function, line);
        } else {
            fprintf(mr_flog, "INFO: ");
        }
        va_start(args,fmt);
        if (vfprintf(mr_flog, fmt, args) < 0) {
            fprintf(stderr,"Unable to print to %s\n",mr_logfile);
        }
        fprintf(mr_flog,"\n");
        va_end(args);

    }
    return;
}