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