57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
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FUNCTION
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<<strcasecmp>>---case-insensitive character string compare
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INDEX
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strcasecmp
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ANSI_SYNOPSIS
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#include <string.h>
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int strcasecmp(const char *<[a]>, const char *<[b]>);
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TRAD_SYNOPSIS
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#include <string.h>
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int strcasecmp(<[a]>, <[b]>)
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char *<[a]>;
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char *<[b]>;
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DESCRIPTION
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<<strcasecmp>> compares the string at <[a]> to
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the string at <[b]> in a case-insensitive manner.
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RETURNS
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If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after
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both are converted to uppercase), <<strcasecmp>> returns a
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number greater than zero. If the two strings match,
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<<strcasecmp>> returns zero. If <<*<[a]>>> sorts
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lexicographically before <<*<[b]>>>, <<strcasecmp>> returns a
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number less than zero.
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PORTABILITY
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<<strcasecmp>> is in the Berkeley Software Distribution.
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<<strcasecmp>> requires no supporting OS subroutines. It uses
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tolower() from elsewhere in this library.
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QUICKREF
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strcasecmp
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*/
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#include <string.h>
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#include <ctype.h>
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int
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_DEFUN (strcasecmp, (s1, s2),
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_CONST char *s1 _AND
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_CONST char *s2)
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{
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while (*s1 != '\0' && tolower(*s1) == tolower(*s2))
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{
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s1++;
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s2++;
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}
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return tolower(*(unsigned char *) s1) - tolower(*(unsigned char *) s2);
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}
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