FreeCalypso > hg > freecalypso-reveng

annotate mpffs/find.c @ 262:db000ea183a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
pirelli/fw-disasm: CV charging analyzed
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 26 Dec 2017 12:26:23 +0000
parents 95f61c3b430a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
34
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 /*
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 * This module contains the code for searching the FFS tree structure
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 * for a specified absolute pathname.
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 */
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6 #include <sys/types.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7 #include <ctype.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 #include <stdio.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9 #include <string.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 #include <strings.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11 #include <stdlib.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 #include <unistd.h>
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13 #include "types.h"
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 #include "struct.h"
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16 extern int root_node_no;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18 /*
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19 * The following function iterates through the descendants of a directory
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
20 * object looking for a specific directory-member filename.
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
21 *
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 * Arguments:
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
23 * - index # of the first descendant (descendant pointer from the dir object)
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
24 * - filename to search for
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
25 *
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
26 * Returns: index # of the sought descendant object if found, 0 otherwise.
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
27 */
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
28 find_dir_member(first_descend, srchname)
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
29 char *srchname;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
30 {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
31 int ent;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
32 struct objinfo obj;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
33
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
34 for (ent = first_descend; ent != 0xFFFF; ent = obj.sibling) {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
35 obj.entryno = ent;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
36 get_index_entry(&obj);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
37 if (!obj.type) /* skip deleted objects w/o further looking */
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
38 continue;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
39 validate_chunk(&obj);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
40 validate_obj_name(&obj);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
41 if (!strcmp(obj.dataptr, srchname))
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
42 return(ent);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
43 }
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
44 return(0);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
45 }
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
46
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
47 /*
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
48 * The following function searches for a pathname from the root down.
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
49 * Returns the index # if found, otherwise exits with an error message
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
50 * indicating which step failed.
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
51 *
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
52 * Warning: the pathname in the argument buffer will be destroyed:
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
53 * 0s put in place of the slashes.
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
54 */
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
55 find_pathname(pathname)
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
56 char *pathname;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
57 {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
58 char *cur, *next;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
59 int idx;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
60 struct objinfo dir;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
61
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
62 cur = pathname;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
63 if (*cur == '/')
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
64 cur++;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
65 for (idx = root_node_no; cur; cur = next) {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
66 if (!*cur)
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
67 break;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
68 next = index(cur, '/');
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
69 if (next == cur) {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
70 fprintf(stderr,
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
71 "malformed pathname: multiple adjacent slashes\n");
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
72 exit(1);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
73 }
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
74 if (next)
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
75 *next++ = '\0';
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
76 dir.entryno = idx;
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
77 get_index_entry(&dir);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
78 if (dir.type != 0xF2) {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
79 fprintf(stderr,
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
80 "pathname search error: encountered a non-directory\n");
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
81 exit(1);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
82 }
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
83 idx = find_dir_member(dir.descend, cur);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
84 if (!idx) {
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
85 fprintf(stderr,
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
86 "pathname search error: component name not found\n");
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
87 exit(1);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
88 }
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
89 }
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
90 return(idx);
95f61c3b430a mpffs-rdutils: pathname search implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
91 }