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Diffstat (limited to 'contrib/sendmail/libsm/strrevcmp.c')
-rw-r--r-- | contrib/sendmail/libsm/strrevcmp.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/contrib/sendmail/libsm/strrevcmp.c b/contrib/sendmail/libsm/strrevcmp.c new file mode 100644 index 0000000..d0ed630 --- /dev/null +++ b/contrib/sendmail/libsm/strrevcmp.c @@ -0,0 +1,101 @@ +/* + * Copyright (c) 2001 Sendmail, Inc. and its suppliers. + * All rights reserved. + * + * By using this file, you agree to the terms and conditions set + * forth in the LICENSE file which can be found at the top level of + * the sendmail distribution. + * + */ + +#include <sm/gen.h> +SM_RCSID("@(#)$Id: strrevcmp.c,v 1.5 2001/09/11 04:04:49 gshapiro Exp $") + +#include <sm/config.h> +#include <sm/string.h> +#include <string.h> + +/* strcasecmp.c */ +extern const unsigned char charmap[]; + +/* +** SM_STRREVCASECMP -- compare two strings starting at the end (ignore case) +** +** Parameters: +** s1 -- first string. +** s2 -- second string. +** +** Returns: +** strcasecmp(reverse(s1), reverse(s2)) +*/ + +int +sm_strrevcasecmp(s1, s2) + const char *s1, *s2; +{ + register int i1, i2; + + i1 = strlen(s1) - 1; + i2 = strlen(s2) - 1; + while (i1 >= 0 && i2 >= 0 && + charmap[(unsigned char) s1[i1]] == + charmap[(unsigned char) s2[i2]]) + { + --i1; + --i2; + } + if (i1 < 0) + { + if (i2 < 0) + return 0; + else + return -1; + } + else + { + if (i2 < 0) + return 1; + else + return (charmap[(unsigned char) s1[i1]] - + charmap[(unsigned char) s2[i2]]); + } +} +/* +** SM_STRREVCMP -- compare two strings starting at the end +** +** Parameters: +** s1 -- first string. +** s2 -- second string. +** +** Returns: +** strcmp(reverse(s1), reverse(s2)) +*/ + +int +sm_strrevcmp(s1, s2) + const char *s1, *s2; +{ + register int i1, i2; + + i1 = strlen(s1) - 1; + i2 = strlen(s2) - 1; + while (i1 >= 0 && i2 >= 0 && s1[i1] == s2[i2]) + { + --i1; + --i2; + } + if (i1 < 0) + { + if (i2 < 0) + return 0; + else + return -1; + } + else + { + if (i2 < 0) + return 1; + else + return s1[i1] - s2[i2]; + } +} |