release/src/router/busybox/e2fsprogs/e2p/hashstr.c

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