1 /*
2 * feature.c --- convert between features and strings
3 *
4 * Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12 #include "config.h"
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <ctype.h>
17 #include <errno.h>
18
19 #include "e2p.h"
20
21 struct hash {
22 int num;
23 const char *string;
24 };
25
26 static struct hash hash_list[] = {
27 { EXT2_HASH_LEGACY, "legacy" },
28 { EXT2_HASH_HALF_MD4, "half_md4" },
29 { EXT2_HASH_TEA, "tea" },
30 { 0, 0 },
31 };
32
e2p_hash2string(int num)33 const char *e2p_hash2string(int num)
34 {
35 struct hash *p;
36 static char buf[20];
37
38 for (p = hash_list; p->string; p++) {
39 if (num == p->num)
40 return p->string;
41 }
42 sprintf(buf, "HASHALG_%d", num);
43 return buf;
44 }
45
46 /*
47 * Returns the hash algorithm, or -1 on error
48 */
e2p_string2hash(char * string)49 int e2p_string2hash(char *string)
50 {
51 struct hash *p;
52 char *eptr;
53 int num;
54
55 for (p = hash_list; p->string; p++) {
56 if (!strcasecmp(string, p->string)) {
57 return p->num;
58 }
59 }
60 if (strncasecmp(string, "HASHALG_", 8))
61 return -1;
62
63 if (string[8] == 0)
64 return -1;
65 num = strtol(string+8, &eptr, 10);
66 if (num > 255 || num < 0)
67 return -1;
68 if (*eptr)
69 return -1;
70 return num;
71 }
72
73