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- #include "stdinc.h"
- #include "dat.h"
- #include "fns.h"
- static char vcmagic[] = "venti config\n";
- enum {
- Maxconfig = 8 * 1024,
- Maglen = sizeof vcmagic - 1,
- };
- int
- readifile(IFile *f, char *name)
- {
- Part *p;
- ZBlock *b;
- u8int *z;
- p = initpart(name, OREAD);
- if(p == nil)
- return -1;
- b = alloczblock(Maxconfig+1, 1, 0);
- if(b == nil){
- seterr(EOk, "can't alloc for %s: %R", name);
- return -1;
- }
- if(p->size > PartBlank){
- /*
- * this is likely a real venti partition, in which case we're
- * looking for the config file stored as 8k at end of PartBlank.
- */
- if(readpart(p, PartBlank-Maxconfig, b->data, Maxconfig) < 0){
- seterr(EOk, "can't read %s: %r", name);
- freezblock(b);
- freepart(p);
- return -1;
- }
- b->data[Maxconfig] = '\0';
- if(memcmp(b->data, vcmagic, Maglen) != 0){
- seterr(EOk, "bad venti config magic in %s", name);
- freezblock(b);
- freepart(p);
- return -1;
- }
- /*
- * if we change b->data+b->_size, freezblock
- * will blow an assertion, so don't.
- */
- b->data += Maglen;
- b->_size -= Maglen;
- b->len -= Maglen;
- z = memchr(b->data, '\0', b->len);
- if(z)
- b->len = z - b->data;
- }else if(p->size > Maxconfig){
- seterr(EOk, "config file is too large");
- freepart(p);
- freezblock(b);
- return -1;
- }else{
- freezblock(b);
- b = readfile(name);
- if(b == nil){
- freepart(p);
- return -1;
- }
- }
- freepart(p);
- f->name = name;
- f->b = b;
- f->pos = 0;
- return 0;
- }
- void
- freeifile(IFile *f)
- {
- freezblock(f->b);
- f->b = nil;
- f->pos = 0;
- }
- int
- partifile(IFile *f, Part *part, u64int start, u32int size)
- {
- ZBlock *b;
- b = alloczblock(size, 0, part->blocksize);
- if(b == nil)
- return -1;
- if(readpart(part, start, b->data, size) < 0){
- seterr(EAdmin, "can't read %s: %r", part->name);
- freezblock(b);
- return -1;
- }
- f->name = part->name;
- f->b = b;
- f->pos = 0;
- return 0;
- }
- /*
- * return the next non-blank input line,
- * stripped of leading white space and with # comments eliminated
- */
- char*
- ifileline(IFile *f)
- {
- char *s, *e, *t;
- int c;
- for(;;){
- s = (char*)&f->b->data[f->pos];
- e = memchr(s, '\n', f->b->len - f->pos);
- if(e == nil)
- return nil;
- *e++ = '\0';
- f->pos = e - (char*)f->b->data;
- t = strchr(s, '#');
- if(t != nil)
- *t = '\0';
- for(; c = *s; s++)
- if(c != ' ' && c != '\t' && c != '\r')
- return s;
- }
- }
- int
- ifilename(IFile *f, char *dst)
- {
- char *s;
- s = ifileline(f);
- if(s == nil || strlen(s) >= ANameSize)
- return -1;
- namecp(dst, s);
- return 0;
- }
- int
- ifileu32int(IFile *f, u32int *r)
- {
- char *s;
- s = ifileline(f);
- if(s == nil)
- return -1;
- return stru32int(s, r);
- }
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