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strcasecmp(3) [freebsd man page]

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

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); #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 len, locale_t loc); DESCRIPTION
The strcasecmp() and strncasecmp() functions compare the null-terminated strings s1 and s2. The strncasecmp() function compares at most len characters. The strcasecmp_l() and strncasecmp_l() functions do the same as their non-locale versions above, but take an explicit locale rather than using the current locale. RETURN VALUES
The functions strcasecmp() and strncasecmp() return an integer greater than, equal to, or less than 0, depending on whether s1 is lexico- graphically 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 ''. The functions strcasecmp_l() and strncasecmp_l() do the same but take explicit locales. SEE ALSO
bcmp(3), memcmp(3), strcmp(3), strcoll(3), strxfrm(3), tolower(3), wcscasecmp(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. BSD
May 29, 2014 BSD

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