mash/rdconfig.c

/*****************************************************************************
 * Copyright (C) 2014
 *   
 * Michiel Broek <mbroek at mbse dot eu>
 *
 * This file is part of the mbsePi-apps
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * mbsePi-apps is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with EC-65K; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *****************************************************************************/

#include "mash.h"
#include "xutil.h"


int		debug = FALSE;
static char	*mypath;
static char	*k, *v;
static int	linecnt = 0;
sys_config	Config;			/* System configuration		*/


static int getint(char **);
static int getw1(char **);


#define XSTR(x) #x
#define STR(x) XSTR(x)

/*
 * System configuration table
 */
key_list keytab[] = {
    {(char *)"w1therm",			getw1,		(char **)&Config.w1therms},
    {(char *)"lcd_cols",		getint,		(char **)&Config.lcd_cols},
    {(char *)"lcd_rows",		getint,		(char **)&Config.lcd_rows},
    {NULL,				NULL,		NULL}
};


void killconfig(void)
{
    w1_therm	*tmp1, *old1;

    if (Config.name)
	free(Config.name);
    Config.name = NULL;

    for (tmp1 = Config.w1therms; tmp1; tmp1 = old1) {
	old1 = tmp1->next;
	if (tmp1->master)
	    free(tmp1->master);
	if (tmp1->name)
	    free(tmp1->name);
	if (tmp1->alias)
	    free(tmp1->alias);
	free(tmp1);
    }
    Config.w1therms = NULL;
    Config.my_port = 6554;

    Config.lcd_cols = 16;
    Config.lcd_rows = 2;
}


int wrconfig(char *config)
{
    int		rc = 0;
    FILE	*fp;
    w1_therm    *tmp1;

    if (getenv((char *)"USER") == NULL) {
	mypath = xstrcpy((char *)"/root");
    } else {
    	mypath = xstrcpy(getenv((char *)"HOME"));
    }
    mypath = xstrcat(mypath, (char *)"/mbsepi-apps/");
    mypath = xstrcat(mypath, config);

    if (debug)
	fprintf(stdout, "Writing %s\n", mypath);

    if ((fp = fopen(mypath, "w")) == NULL) {
	syslog(LOG_NOTICE, "could not rewrite %s", mypath);
	return 1;
    }

    fprintf(fp, "# Configuration file for thermferm %s\n", VERSION);
    fprintf(fp, "\n");

    fprintf(fp, "# LCD display\n");
    fprintf(fp, "#\n");
    fprintf(fp, "lcd_cols	%d\n", Config.lcd_cols);
    fprintf(fp, "lcd_rows	%d\n", Config.lcd_rows);
    fprintf(fp, "\n");

    fprintf(fp, "# DS18B20 temperature sensors on the 1-wire bus.\n");
    fprintf(fp, "#\n");
    fprintf(fp, "# kwd		master		bus	name		alias\n");
    for (tmp1 = Config.w1therms; tmp1; tmp1 = tmp1->next) {
	fprintf(fp, "w1therm		%s	%d	%s	%s\n", tmp1->master, tmp1->bus, tmp1->name, tmp1->alias);
    }
    fprintf(fp, "\n");

    fprintf(fp, "# End of generated configuration\n");
    fclose(fp);
    syslog(LOG_NOTICE, "Written %s rc=%d", mypath, rc);
    free(mypath);
    mypath = NULL;

    return rc;
}


int rdconfig(char *config) 
{
    char	buf[256], *p;
    FILE	*fp;
    int		i, rc = 0;

    killconfig();

    syslog(LOG_NOTICE, "HOME='%s' USER='%s' LOGNAME='%s'", MBSE_SS(getenv((char *)"HOME")), MBSE_SS(getenv((char *)"USER")), MBSE_SS(getenv((char *)"LOGNAME")));

    /*
     * Search config file
     */
    if (getenv((char *)"USER") == NULL) {
	mypath = xstrcpy((char *)"/root");
    } else {
    	mypath = xstrcpy(getenv((char *)"HOME"));
    }
    mypath = xstrcat(mypath, (char *)"/mbsepi-apps/");
    mypath = xstrcat(mypath, config);
    if ((fp = fopen(mypath, "r")) == NULL) {
	/*
	 * Not in the users home directory
	 */
	free(mypath);
	mypath = xstrcpy((char *)"/etc/mbsepi-apps/");
	mypath = xstrcat(mypath, config);
	if ((fp = fopen(mypath, "r")) == NULL) {
	    /*
	     * Try /usr/local/etc
	     */
	    free(mypath);
	    mypath = xstrcpy((char *)"/usr/local/etc/mbsepi-apps/");
	    mypath = xstrcat(mypath, config);
	    if ((fp = fopen(mypath, "r")) == NULL) {
		syslog(LOG_NOTICE, "rdconfig: could find %s", config);
		return 1;
	    }
	}
    }
    syslog(LOG_NOTICE, "rdconfig: using %s", mypath);

    linecnt = 0;
    while (fgets(buf, sizeof(buf) -1, fp)) {
	linecnt++;
	if (*(p = buf + strlen(buf) -1) != '\n') {
	    syslog(LOG_NOTICE, "rdconfig: %s(%d): \"%s\" - line too long", mypath, linecnt, buf);
	    rc = 1;
	    break;
	}
	*p-- = '\0';
	while ((p >= buf) && isspace(*p))
	    *p-- = '\0';
	k = buf;
	while (*k && isspace(*k))
	    k++;
	p = k;
	while (*p && !isspace(*p))
	    p++;
	*p++='\0';
	v = p;
	while (*v && isspace(*v)) 
	    v++;

	if ((*k == '\0') || (*k == '#')) {
	    continue;
	}

	for (i = 0; keytab[i].key; i++)
	    if (strcasecmp(k,keytab[i].key) == 0)
		break;

	if (keytab[i].key == NULL) {
	    syslog(LOG_NOTICE, "rdconfig: %s(%d): %s %s - unknown keyword", mypath, linecnt, MBSE_SS(k), MBSE_SS(v));
	    rc = 1;
	    break;
	} else if ((keytab[i].prc(keytab[i].dest))) {
	    rc = 1;
	    break;
	}

    }
    fclose(fp);

    free(mypath);
    mypath = NULL;

    return rc;
}


static int getint(char **dest)
{
    if (debug)
	syslog(LOG_NOTICE, "rdconfig: getint: %s(%d): %s %s", mypath, linecnt, MBSE_SS(k), MBSE_SS(v));

    if (strspn(v,"0123456789") != strlen(v)) 
	syslog(LOG_NOTICE, "rdconfig: %s(%d): %s %s - bad numeric", mypath, linecnt, MBSE_SS(k), MBSE_SS(v));
    else 
	*((int*)dest)=atoi(v);
    return 0;
}


static int getw1(char **dest)
{
    char	*p, *q = NULL, *r = NULL;
    w1_therm	**tmpm;
    int		rc = 0, tmpp;

    for (p = v; *p && !isspace(*p); p++);
    if (*p)
	*p++ = '\0';
    while (*p && isspace(*p))
	p++;
    if (*p == '\0') {
	syslog(LOG_NOTICE, "rdconfig: %s(%d): less then two tokens", mypath, linecnt);
	return 1;
    }

    for (q = p; *q && !isspace(*q); q++);
    if (*q && isspace(*q)) {
	if (*q)
	    *q++ = '\0';
	while (*q && isspace(*q))
	    q++;

	for (r = q; *r && !isspace(*r); r++);
	if (*r)
	    *r++ = '\0';
	rc = sscanf(p, "%d", &tmpp);
	if (rc != 1) {
	    syslog(LOG_NOTICE, "rdconfig: getw1: %s(%d): %s is not a integer value", mypath, linecnt, p);
	    return 1;
	}
	if (debug)
	    syslog(LOG_NOTICE, "rdconfig: getw1: %s(%d): %s %d %s %s", mypath, linecnt, v, tmpp, q, r);
    }

    for (tmpm = (w1_therm**)dest; *tmpm; tmpm=&((*tmpm)->next));
    (*tmpm) = (w1_therm *) xmalloc(sizeof(w1_therm));
    (*tmpm)->next = NULL;
    (*tmpm)->master = xstrcpy(v);
    (*tmpm)->bus = tmpp;
    (*tmpm)->name = xstrcpy(q);
    (*tmpm)->alias = xstrcpy(r);
    (*tmpm)->present = 0;
    (*tmpm)->lastval = 0;
    (*tmpm)->update = 0;

    return 0;
}