STRCASECMP(3)            BSD Library Functions Manual            STRCASECMP(3)

NAME
     strcasecmp, strncasecmp, strcasecmpl, strncasecmpl -- compare strings,
     ignoring case

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##include <>

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

     int
     strncasecmp(const char *s1, const char *s2, sizet len);

     ##include <>

     int
     strcasecmpl(const char *s1, const char *s2, localet loc);

     int
     strncasecmpl(const char *s1, const char *s2, sizet len, localet loc);

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

     The strncasecmp() compares at most len characters.

     While the strcasecmp() and strncasecmp() functions use the current
     locale, the strcasecmpl() and strncasecmpl() 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 charac-
     ter to lower-case.  The strings themselves are not modified.  The compar-
     ison 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  before they were moved
     to  for IE Std 1003.1-2001 (``POSIX.1'') compliance.

BSD                              June 9, 1993                              BSD