The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> strings.h - string operations

#### SYNOPSIS

> `#include <strings.h>`

#### DESCRIPTION

> The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided for use with ISO C standard compilers.

>     [XSI]
>     int    ffs(int);

>     int    strcasecmp(const char *, const char *);
>     int    strcasecmp_l(const char *, const char *, locale_t);
>     int    strncasecmp(const char *, const char *, size_t);
>     int    strncasecmp_l(const char *, const char *, size_t, locale_t);

> The <strings.h> header shall define the locale_t type as described in <locale.h>.

> The <strings.h> header shall define the size_t type as described in <sys/types.h>.

The following sections are informative.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> <locale.h>, <sys/types.h>

> XSH ffs, strcasecmp

#### CHANGE HISTORY

> First released in Issue 4, Version 2.

#### Issue 6

> The Open Group Corrigendum U021/2 is applied, correcting the prototype for index() to be consistent with the reference page.

> The bcmp(), bcopy(), bzero(), index(), and rindex() functions are marked LEGACY.

#### Issue 7

> SD5-XBD-ERN-56 is applied, adding a reference to <sys/types.h> for the size_t type.

> The LEGACY functions are removed.

> The <strings.h> header is moved from the XSI option to the Base.

> The strcasecmp_l() and strncasecmp_l() functions are added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

> A declaration for the locale_t type is added.

End of informative text.

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