bootargs.c

#include	"u.h"
#include	"../port/lib.h"
#include	"mem.h"
#include	"dat.h"
#include	"fns.h"



/* store plan9.ini contents here at least until we stash them in #ec */

#define BOOTARGS	((char*)CONFADDR)
#define	BOOTARGSLEN	(16*1024)		/* limit in devenv.c */
#define	MAXCONF		64
#define MAXCONFLINE	160
#define isascii(c) ((uchar)(c) > 0 && (uchar)(c) < 0177)

static char confname[MAXCONF][KNAMELEN];
static char confval[MAXCONF][MAXCONFLINE];
int nconf;


/* plan9.ini stuff */


static int
findconf(char *name)
{
	int i;

	for(i = 0; i < nconf; i++)
		if(cistrcmp(confname[i], name) == 0)
			return i;
	return -1;
}

char*
getconf(char *name)
{
	int i;

	i = findconf(name);
	if(i >= 0)
		return confval[i];
	return nil;
}

static void
addconf(char *name, char *val)
{
	int i;

	i = findconf(name);
	if(i < 0){
		if(val == nil || nconf >= MAXCONF)
			return;
		i = nconf++;
		strecpy(confname[i], confname[i]+sizeof(confname[i]), name);
	}
//	confval[i] = val;
	strecpy(confval[i], confval[i]+sizeof(confval[i]), val);
}

static void
writeconf(void)
{
	char *p, *q;
	int n;

	p = getconfenv();

	if(waserror()) {
		free(p);
		nexterror();
	}

	/* convert to name=value\n format */
	for(q=p; *q; q++) {
		q += strlen(q);
		*q = '=';
		q += strlen(q);
		*q = '\n';
	}
	n = q - p + 1;
	if(n >= BOOTARGSLEN)
		error("kernel configuration too large");
	memmove(BOOTARGS, p, n);
	poperror();
	free(p);
}

void
setconfenv(void)
{
	int i;

	for(i = 0; i < nconf; i++){
		if(confname[i][0] != '*')
			ksetenv(confname[i], confval[i], 0);
		ksetenv(confname[i], confval[i], 1);
	}
}

/*
 * assumes that we have loaded our /cfg/pxe/mac 
 * file at 0x10000 with tftp in u-boot.  
 * no longer uses malloc, so can be called early.
 */
void
plan9iniinit(void)
{
	char *k, *v, *next;

	k = (char *)CONFADDR;
	if(!isascii(*k))
		return;

	for(; k && *k != '\0'; k = next) {
		if (!isascii(*k))		/* sanity check */
			break;
		next = strchr(k, '\n');
		if (next)
			*next++ = '\0';

		if (*k == '\0' || *k == '\n' || *k == '#')
			continue;
		v = strchr(k, '=');
		if(v == nil)
			continue;		/* mal-formed line */
		*v++ = '\0';

		addconf(k, v);
	}
}