1 a0d146ed 2005-07-12 devnull #include "stdinc.h"
2 a0d146ed 2005-07-12 devnull #include "dat.h"
3 a0d146ed 2005-07-12 devnull #include "fns.h"
5 7a400ee9 2007-09-25 rsc static char vcmagic[] = "venti config\n";
8 7a400ee9 2007-09-25 rsc Maxconfig = 8 * 1024,
9 7a400ee9 2007-09-25 rsc Maglen = sizeof vcmagic - 1,
13 a0d146ed 2005-07-12 devnull readifile(IFile *f, char *name)
16 a0d146ed 2005-07-12 devnull ZBlock *b;
17 91872ab9 2007-05-03 devnull u8int *z;
19 91872ab9 2007-05-03 devnull p = initpart(name, OREAD);
20 91872ab9 2007-05-03 devnull if(p == nil)
21 a0d146ed 2005-07-12 devnull return -1;
22 7a400ee9 2007-09-25 rsc b = alloczblock(Maxconfig+1, 1, 0);
23 91872ab9 2007-05-03 devnull if(b == nil){
24 91872ab9 2007-05-03 devnull seterr(EOk, "can't alloc for %s: %R", name);
25 91872ab9 2007-05-03 devnull return -1;
27 91872ab9 2007-05-03 devnull if(p->size > PartBlank){
29 7a400ee9 2007-09-25 rsc * this is likely a real venti partition, in which case we're
30 7a400ee9 2007-09-25 rsc * looking for the config file stored as 8k at end of PartBlank.
32 7a400ee9 2007-09-25 rsc if(readpart(p, PartBlank-Maxconfig, b->data, Maxconfig) < 0){
33 91872ab9 2007-05-03 devnull seterr(EOk, "can't read %s: %r", name);
34 91872ab9 2007-05-03 devnull freezblock(b);
35 91872ab9 2007-05-03 devnull freepart(p);
36 91872ab9 2007-05-03 devnull return -1;
38 7a400ee9 2007-09-25 rsc b->data[Maxconfig] = '\0';
39 7a400ee9 2007-09-25 rsc if(memcmp(b->data, vcmagic, Maglen) != 0){
40 91872ab9 2007-05-03 devnull seterr(EOk, "bad venti config magic in %s", name);
41 91872ab9 2007-05-03 devnull freezblock(b);
42 91872ab9 2007-05-03 devnull freepart(p);
43 91872ab9 2007-05-03 devnull return -1;
46 7a400ee9 2007-09-25 rsc * if we change b->data+b->_size, freezblock
47 7a400ee9 2007-09-25 rsc * will blow an assertion, so don't.
49 7a400ee9 2007-09-25 rsc b->data += Maglen;
50 7a400ee9 2007-09-25 rsc b->_size -= Maglen;
51 7a400ee9 2007-09-25 rsc b->len -= Maglen;
52 7a400ee9 2007-09-25 rsc z = memchr(b->data, '\0', b->len);
54 91872ab9 2007-05-03 devnull b->len = z - b->data;
55 7a400ee9 2007-09-25 rsc }else if(p->size > Maxconfig){
56 91872ab9 2007-05-03 devnull seterr(EOk, "config file is too large");
57 91872ab9 2007-05-03 devnull freepart(p);
58 91872ab9 2007-05-03 devnull freezblock(b);
59 91872ab9 2007-05-03 devnull return -1;
61 91872ab9 2007-05-03 devnull freezblock(b);
62 91872ab9 2007-05-03 devnull b = readfile(name);
63 91872ab9 2007-05-03 devnull if(b == nil){
64 91872ab9 2007-05-03 devnull freepart(p);
65 91872ab9 2007-05-03 devnull return -1;
68 91872ab9 2007-05-03 devnull freepart(p);
69 a0d146ed 2005-07-12 devnull f->name = name;
70 a0d146ed 2005-07-12 devnull f->b = b;
71 a0d146ed 2005-07-12 devnull f->pos = 0;
72 a0d146ed 2005-07-12 devnull return 0;
76 a0d146ed 2005-07-12 devnull freeifile(IFile *f)
78 a0d146ed 2005-07-12 devnull freezblock(f->b);
79 a0d146ed 2005-07-12 devnull f->b = nil;
80 a0d146ed 2005-07-12 devnull f->pos = 0;
84 a0d146ed 2005-07-12 devnull partifile(IFile *f, Part *part, u64int start, u32int size)
86 a0d146ed 2005-07-12 devnull ZBlock *b;
88 a0d146ed 2005-07-12 devnull b = alloczblock(size, 0, part->blocksize);
89 a0d146ed 2005-07-12 devnull if(b == nil)
90 a0d146ed 2005-07-12 devnull return -1;
91 a0d146ed 2005-07-12 devnull if(readpart(part, start, b->data, size) < 0){
92 a0d146ed 2005-07-12 devnull seterr(EAdmin, "can't read %s: %r", part->name);
93 a0d146ed 2005-07-12 devnull freezblock(b);
94 a0d146ed 2005-07-12 devnull return -1;
96 a0d146ed 2005-07-12 devnull f->name = part->name;
97 a0d146ed 2005-07-12 devnull f->b = b;
98 a0d146ed 2005-07-12 devnull f->pos = 0;
99 a0d146ed 2005-07-12 devnull return 0;
103 a0d146ed 2005-07-12 devnull * return the next non-blank input line,
104 a0d146ed 2005-07-12 devnull * stripped of leading white space and with # comments eliminated
107 a0d146ed 2005-07-12 devnull ifileline(IFile *f)
109 a0d146ed 2005-07-12 devnull char *s, *e, *t;
112 a0d146ed 2005-07-12 devnull for(;;){
113 a0d146ed 2005-07-12 devnull s = (char*)&f->b->data[f->pos];
114 a0d146ed 2005-07-12 devnull e = memchr(s, '\n', f->b->len - f->pos);
115 a0d146ed 2005-07-12 devnull if(e == nil)
116 a0d146ed 2005-07-12 devnull return nil;
117 a0d146ed 2005-07-12 devnull *e++ = '\0';
118 a0d146ed 2005-07-12 devnull f->pos = e - (char*)f->b->data;
119 a0d146ed 2005-07-12 devnull t = strchr(s, '#');
120 a0d146ed 2005-07-12 devnull if(t != nil)
121 a0d146ed 2005-07-12 devnull *t = '\0';
122 a0d146ed 2005-07-12 devnull for(; c = *s; s++)
123 a0d146ed 2005-07-12 devnull if(c != ' ' && c != '\t' && c != '\r')
124 a0d146ed 2005-07-12 devnull return s;
129 a0d146ed 2005-07-12 devnull ifilename(IFile *f, char *dst)
131 a0d146ed 2005-07-12 devnull char *s;
133 a0d146ed 2005-07-12 devnull s = ifileline(f);
134 a0d146ed 2005-07-12 devnull if(s == nil || strlen(s) >= ANameSize)
135 a0d146ed 2005-07-12 devnull return -1;
136 a0d146ed 2005-07-12 devnull namecp(dst, s);
137 a0d146ed 2005-07-12 devnull return 0;
141 a0d146ed 2005-07-12 devnull ifileu32int(IFile *f, u32int *r)
143 a0d146ed 2005-07-12 devnull char *s;
145 a0d146ed 2005-07-12 devnull s = ifileline(f);
146 a0d146ed 2005-07-12 devnull if(s == nil)
147 a0d146ed 2005-07-12 devnull return -1;
148 a0d146ed 2005-07-12 devnull return stru32int(s, r);
