The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> strcasecmp, strncasecmp - case-insensitive string comparisons

#### SYNOPSIS

> ``[XSI] #include <strings.h>
> int strcasecmp(const char *`s1`, const char *`s2`);
> int strncasecmp(const char *`s1`, const char *`s2`, size_t` n`);``
> `
> `

#### DESCRIPTION

> The strcasecmp() function shall compare, while ignoring differences in case, the string pointed to by s1 to the string pointed to by s2. The strncasecmp() function shall compare, while ignoring differences in case, not more than n bytes from the string pointed to by s1 to the string pointed to by s2.

> In the POSIX locale, strcasecmp() and strncasecmp() shall behave as if the strings had been converted to lowercase and then a byte comparison performed. The results are unspecified in other locales.

#### RETURN VALUE

> Upon completion, strcasecmp() shall return an integer greater than, equal to, or less than 0, if the string pointed to by s1 is, ignoring case, greater than, equal to, or less than the string pointed to by s2, respectively.

> Upon successful completion, strncasecmp() shall return an integer greater than, equal to, or less than 0, if the possibly null-terminated array pointed to by s1 is, ignoring case, greater than, equal to, or less than the possibly null-terminated array pointed to by s2, respectively.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> The Base Definitions volume of IEEE Std 1003.1-2001, <strings.h>

#### CHANGE HISTORY

> First released in Issue 4, Version 2.

#### Issue 5

> Moved from X/OPEN UNIX extension to BASE.

End of informative text.

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