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#include	"u.h"
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#include	"../port/lib.h"
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#include	"mem.h"
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#include	"dat.h"
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#include	"fns.h"
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#include	"io.h"
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#include	"ureg.h"
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#include	"pool.h"
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#include	"../port/error.h"
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#include	"../port/netif.h"
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#include	"dosfs.h"
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enum {
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	Bufsize = 8192,
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};
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/*
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 *  grab next element from a path, return the pointer to unprocessed portion of
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 *  path.
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 */
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char *
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nextelem(char *path, char *elem)
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{
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	int i;
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	while(*path == '/')
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		path++;
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	if(*path==0 || *path==' ')
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		return 0;
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	for(i=0; *path!='\0' && *path!='/' && *path!=' '; i++){
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		if(i==NAMELEN){
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			print("name component too long\n");
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			return 0;
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		}
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		*elem++ = *path++;
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	}
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	*elem = '\0';
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	return path;
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}
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int
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fswalk(Bootfs *fs, char *path, File *f)
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{
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	char element[NAMELEN];
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	*f = fs->root;
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	if(BADPTR(fs->walk))
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		panic("fswalk bad pointer fs->walk");
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	f->path = path;
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	while(path = nextelem(path, element)){
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		switch(fs->walk(f, element)){
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		case -1:
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			return -1;
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		case 0:
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			return 0;
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		}
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	}
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	return 1;
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}
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/*
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 *  boot
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 */
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int
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fsboot(Bootfs *fs, char *path, Boot *b)
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{
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	long n;
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	char *buf;
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	File file;
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	memset(&file, 0, sizeof file);
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	switch(fswalk(fs, path, &file)){
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	case -1:
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		print("error walking to %s\n", path);
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		return -1;
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	case 0:
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		print("%s not found\n", path);
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		return -1;
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	case 1:
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		print("found %s\n", path);
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		break;
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	}
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	buf = smalloc(Bufsize);
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	while((n = fsread(&file, buf, Bufsize)) > 0) {
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		if(bootpass(b, buf, n) != MORE)
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			break;
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	}
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	bootpass(b, nil, 0);	/* tries boot */
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	free(buf);
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	return -1;
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}
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int
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fsread(File *file, void *a, long n)
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{
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	if(BADPTR(file->fs))
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		panic("bad pointer file->fs in fsread");
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	if(BADPTR(file->fs->read))
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		panic("bad pointer file->fs->read in fsread");
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	return file->fs->read(file, a, n);
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}