1 /* 2 * Copyright (c) 2000-2001 Proofpoint, Inc. and its suppliers. 3 * All rights reserved. 4 * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved. 5 * Copyright (c) 1987, 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * By using this file, you agree to the terms and conditions set 9 * forth in the LICENSE file which can be found at the top level of 10 * the sendmail distribution. 11 * 12 */ 13 14 #include <sm/gen.h> 15 SM_RCSID("@(#)$Id: strcasecmp.c,v 1.16 2013-11-22 20:51:43 ca Exp $") 16 17 #include <sm/config.h> 18 #include <sm/string.h> 19 #include <string.h> 20 21 /* 22 ** SM_STRCASECMP -- 8-bit clean version of strcasecmp 23 ** 24 ** Thank you, vendors, for making this all necessary. 25 */ 26 27 /* 28 ** This array is designed for mapping upper and lower case letter 29 ** together for a case independent comparison. The mappings are 30 ** based upon ascii character sequences. 31 */ 32 33 const unsigned char charmap[] = 34 { 35 0000, 0001, 0002, 0003, 0004, 0005, 0006, 0007, 36 0010, 0011, 0012, 0013, 0014, 0015, 0016, 0017, 37 0020, 0021, 0022, 0023, 0024, 0025, 0026, 0027, 38 0030, 0031, 0032, 0033, 0034, 0035, 0036, 0037, 39 0040, 0041, 0042, 0043, 0044, 0045, 0046, 0047, 40 0050, 0051, 0052, 0053, 0054, 0055, 0056, 0057, 41 0060, 0061, 0062, 0063, 0064, 0065, 0066, 0067, 42 0070, 0071, 0072, 0073, 0074, 0075, 0076, 0077, 43 0100, 0141, 0142, 0143, 0144, 0145, 0146, 0147, 44 0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157, 45 0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167, 46 0170, 0171, 0172, 0133, 0134, 0135, 0136, 0137, 47 0140, 0141, 0142, 0143, 0144, 0145, 0146, 0147, 48 0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157, 49 0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167, 50 0170, 0171, 0172, 0173, 0174, 0175, 0176, 0177, 51 0200, 0201, 0202, 0203, 0204, 0205, 0206, 0207, 52 0210, 0211, 0212, 0213, 0214, 0215, 0216, 0217, 53 0220, 0221, 0222, 0223, 0224, 0225, 0226, 0227, 54 0230, 0231, 0232, 0233, 0234, 0235, 0236, 0237, 55 0240, 0241, 0242, 0243, 0244, 0245, 0246, 0247, 56 0250, 0251, 0252, 0253, 0254, 0255, 0256, 0257, 57 0260, 0261, 0262, 0263, 0264, 0265, 0266, 0267, 58 0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277, 59 0300, 0301, 0302, 0303, 0304, 0305, 0306, 0307, 60 0310, 0311, 0312, 0313, 0314, 0315, 0316, 0317, 61 0320, 0321, 0322, 0323, 0324, 0325, 0326, 0327, 62 0330, 0331, 0332, 0333, 0334, 0335, 0336, 0337, 63 0340, 0341, 0342, 0343, 0344, 0345, 0346, 0347, 64 0350, 0351, 0352, 0353, 0354, 0355, 0356, 0357, 65 0360, 0361, 0362, 0363, 0364, 0365, 0366, 0367, 66 0370, 0371, 0372, 0373, 0374, 0375, 0376, 0377, 67 }; 68 69 int 70 sm_strcasecmp(s1, s2) 71 const char *s1, *s2; 72 { 73 const unsigned char *us1 = (const unsigned char *)s1; 74 const unsigned char *us2 = (const unsigned char *)s2; 75 76 while (charmap[*us1] == charmap[*us2]) 77 { 78 if (*us1 == '\0') 79 return 0; 80 ++us1; 81 ++us2; 82 } 83 return charmap[*us1] - charmap[*us2]; 84 } 85 86 int 87 sm_strncasecmp(s1, s2, n) 88 const char *s1, *s2; 89 register size_t n; 90 { 91 if (n != 0) 92 { 93 register const unsigned char *cm = charmap; 94 register const unsigned char *us1 = (const unsigned char *)s1; 95 register const unsigned char *us2 = (const unsigned char *)s2; 96 97 do 98 { 99 if (cm[*us1] != cm[*us2++]) 100 return (cm[*us1] - cm[*--us2]); 101 if (*us1++ == '\0') 102 break; 103 } while (--n != 0); 104 } 105 return 0; 106 } 107