102 lines
1.6 KiB
C
102 lines
1.6 KiB
C
/*
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* Copyright (c) 2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: strrevcmp.c,v 1.5 2001/09/11 04:04:49 gshapiro Exp $")
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#include <sm/config.h>
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#include <sm/string.h>
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#include <string.h>
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/* strcasecmp.c */
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extern const unsigned char charmap[];
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/*
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** SM_STRREVCASECMP -- compare two strings starting at the end (ignore case)
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**
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** Parameters:
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** s1 -- first string.
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** s2 -- second string.
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**
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** Returns:
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** strcasecmp(reverse(s1), reverse(s2))
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*/
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int
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sm_strrevcasecmp(s1, s2)
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const char *s1, *s2;
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{
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register int i1, i2;
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i1 = strlen(s1) - 1;
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i2 = strlen(s2) - 1;
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while (i1 >= 0 && i2 >= 0 &&
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charmap[(unsigned char) s1[i1]] ==
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charmap[(unsigned char) s2[i2]])
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{
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--i1;
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--i2;
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}
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if (i1 < 0)
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{
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if (i2 < 0)
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return 0;
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else
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return -1;
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}
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else
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{
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if (i2 < 0)
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return 1;
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else
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return (charmap[(unsigned char) s1[i1]] -
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charmap[(unsigned char) s2[i2]]);
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}
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}
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/*
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** SM_STRREVCMP -- compare two strings starting at the end
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**
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** Parameters:
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** s1 -- first string.
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** s2 -- second string.
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**
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** Returns:
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** strcmp(reverse(s1), reverse(s2))
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*/
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int
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sm_strrevcmp(s1, s2)
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const char *s1, *s2;
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{
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register int i1, i2;
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i1 = strlen(s1) - 1;
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i2 = strlen(s2) - 1;
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while (i1 >= 0 && i2 >= 0 && s1[i1] == s2[i2])
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{
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--i1;
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--i2;
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}
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if (i1 < 0)
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{
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if (i2 < 0)
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return 0;
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else
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return -1;
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}
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else
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{
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if (i2 < 0)
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return 1;
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else
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return s1[i1] - s2[i2];
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}
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}
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