1 /* 2 * Copyright (c) 2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 */ 10 11 #pragma ident "%Z%%M% %I% %E% SMI" 12 13 #include <sm/gen.h> 14 SM_RCSID("@(#)$Id: strrevcmp.c,v 1.2 2001/08/27 22:21:51 gshapiro Exp $") 15 16 #include <sm/config.h> 17 #include <sm/string.h> 18 #include <string.h> 19 20 /* strcasecmp.c */ 21 extern const unsigned char charmap[]; 22 23 /* 24 ** SM_STRREVCASECMP -- compare two strings starting at the end (ignore case) 25 ** 26 ** Parameters: 27 ** s1 -- first string. 28 ** s2 -- second string. 29 ** 30 ** Returns: 31 ** strcasecmp(reverse(s1), reverse(s2)) 32 */ 33 34 int 35 sm_strrevcasecmp(s1, s2) 36 const char *s1, *s2; 37 { 38 register int i1, i2; 39 40 i1 = strlen(s1) - 1; 41 i2 = strlen(s2) - 1; 42 while (i1 >= 0 && i2 >= 0 && 43 charmap[(unsigned char) s1[i1]] == 44 charmap[(unsigned char) s2[i2]]) 45 { 46 --i1; 47 --i2; 48 } 49 if (i1 < 0) 50 { 51 if (i2 < 0) 52 return 0; 53 else 54 return -1; 55 } 56 else 57 { 58 if (i2 < 0) 59 return 1; 60 else 61 return (charmap[(unsigned char) s1[i1]] - 62 charmap[(unsigned char) s2[i2]]); 63 } 64 } 65 /* 66 ** SM_STRREVCMP -- compare two strings starting at the end 67 ** 68 ** Parameters: 69 ** s1 -- first string. 70 ** s2 -- second string. 71 ** 72 ** Returns: 73 ** strcmp(reverse(s1), reverse(s2)) 74 */ 75 76 int 77 sm_strrevcmp(s1, s2) 78 const char *s1, *s2; 79 { 80 register int i1, i2; 81 82 i1 = strlen(s1) - 1; 83 i2 = strlen(s2) - 1; 84 while (i1 >= 0 && i2 >= 0 && s1[i1] == s2[i2]) 85 { 86 --i1; 87 --i2; 88 } 89 if (i1 < 0) 90 { 91 if (i2 < 0) 92 return 0; 93 else 94 return -1; 95 } 96 else 97 { 98 if (i2 < 0) 99 return 1; 100 else 101 return s1[i1] - s2[i2]; 102 } 103 } 104