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