STRCASECMP(3)              Library Functions Manual              STRCASECMP(3)

NAME
     strcasecmp, strcasecmp_l, strncasecmp, strncasecmp_l - compare strings,
     ignoring case

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <strings.h>

     int
     strcasecmp(const char *s1, const char *s2);

     int
     strncasecmp(const char *s1, const char *s2, size_t n);

     #include <strings.h>
     #include <xlocale.h>

     int
     strcasecmp_l(const char *s1, const char *s2, locale_t loc);

     int
     strncasecmp_l(const char *s1, const char *s2, size_t n, locale_t loc);

DESCRIPTION
     The strcasecmp() and strncasecmp() functions compare the null-terminated
     strings s1 and s2.

     The strncasecmp() compares at most n characters.

     Although the strcasecmp() and strncasecmp() functions use the current
     locale, the strcasecmp_l() and strncasecmp_l() functions may be passed
     locales directly. See xlocale(3) for more information.

RETURN VALUES
     The strcasecmp() and strncasecmp() return an integer greater than, equal
     to, or less than 0, according as s1 is lexicographically greater than,
     equal to, or less than s2 after translation of each corresponding
     character to lower-case.  The strings themselves are not modified.  The
     comparison is done using unsigned characters, so that `\200' is greater
     than `\0'.

SEE ALSO
     bcmp(3), memcmp(3), strcmp(3), strcoll(3), strxfrm(3), tolower(3),
     xlocale(3)

HISTORY
     The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD.
     Their prototypes existed previously in <string.h> before they were moved
     to <strings.h> for IEEE Std 1003.1-2001 ("POSIX.1") compliance.

macOS 26.6                       June 9, 1993                       macOS 26.6