/* FUNCTION <<strncasecmp>>---case-insensitive character string compare INDEX strncasecmp ANSI_SYNOPSIS #include <strings.h> int strncasecmp(const char *<[a]>, const char * <[b]>, size_t <[length]>); TRAD_SYNOPSIS #include <strings.h> int strncasecmp(<[a]>, <[b]>, <[length]>) char *<[a]>; char *<[b]>; size_t <[length]> DESCRIPTION <<strncasecmp>> compares up to <[length]> characters from the string at <[a]> to the string at <[b]> in a case-insensitive manner. RETURNS If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after both are converted to lowercase), <<strncasecmp>> returns a number greater than zero. If the two strings are equivalent, <<strncasecmp>> returns zero. If <<*<[a]>>> sorts lexicographically before <<*<[b]>>>, <<strncasecmp>> returns a number less than zero. PORTABILITY <<strncasecmp>> is in the Berkeley Software Distribution. <<strncasecmp>> requires no supporting OS subroutines. It uses tolower() from elsewhere in this library. QUICKREF strncasecmp */ #include <strings.h> #include <ctype.h> int _DEFUN (strncasecmp, (s1, s2, n), _CONST char *s1 _AND _CONST char *s2 _AND size_t n) { _CONST unsigned char *ucs1 = (_CONST unsigned char *) s1; _CONST unsigned char *ucs2 = (_CONST unsigned char *) s2; int d = 0; for ( ; n != 0; n--) { _CONST int c1 = tolower(*ucs1++); _CONST int c2 = tolower(*ucs2++); if (((d = c1 - c2) != 0) || (c2 == '\0')) break; } return d; }