65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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FUNCTION
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<<strncasecmp>>---case-insensitive character string compare
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INDEX
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strncasecmp
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ANSI_SYNOPSIS
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#include <string.h>
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int strncasecmp(const char *<[a]>, const char * <[b]>, size_t <[length]>);
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TRAD_SYNOPSIS
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#include <string.h>
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int strncasecmp(<[a]>, <[b]>, <[length]>)
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char *<[a]>;
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char *<[b]>;
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size_t <[length]>
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DESCRIPTION
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<<strncasecmp>> compares up to <[length]> characters
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from the string at <[a]> to the string at <[b]> in a
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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), <<strncasecmp>> returns a
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number greater than zero. If the two strings are equivalent,
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<<strncasecmp>> returns zero. If <<*<[a]>>> sorts
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lexicographically before <<*<[b]>>>, <<strncasecmp>> returns a
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number less than zero.
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PORTABILITY
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<<strncasecmp>> is in the Berkeley Software Distribution.
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<<strncasecmp>> 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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strncasecmp
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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 (strncasecmp, (s1, s2, n),
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_CONST char *s1 _AND
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_CONST char *s2 _AND
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size_t n)
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{
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if (n == 0)
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return 0;
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while (n-- != 0 && tolower(*s1) == tolower(*s2))
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{
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if (n == 0 || *s1 == '\0' || *s2 == '\0')
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break;
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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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