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STRCASECMP(3) Library Functions Manual STRCASECMP(3) NAME strcasecmp, strncasecmp - 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 len); DESCRIPTION The strcasecmp() and strncasecmp() functions compare the nul-terminated strings s1 and s2 and return an integer greater than, equal to, or less than 0, according to whether 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'. The strncasecmp() function compares at most len characters. SEE ALSO bcmp(3), memcmp(3), strcmp(3), strcoll(3), strxfrm(3) STANDARDS The strcasecmp() and strncasecmp() functions conform to IEEE Std 1003.1-2001 ("POSIX.1"). HISTORY The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD. NOTES If len is 0 strncasecmp() always returns 0. NetBSD 8.0 July 11, 2016 NetBSD 8.0