STRCASECMP(3) Linux Programmer's Manual STRCASECMP(3)NAME
strcasecmp, strncasecmp - compare two strings ignoring case
SYNOPSIS
#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 performs a byte-by-byte comparison of the
strings s1 and s2, ignoring the case of the characters. It returns an
integer less than, equal to, or greater than zero if s1 is found,
respectively, to be less than, to match, or be greater than s2.
The strncasecmp() function is similar, except that it compares no more
than n bytes of s1 and s2.
RETURN VALUE
The strcasecmp() and strncasecmp() functions return an integer less
than, equal to, or greater than zero if s1 is, after ignoring case,
found to be less than, to match, or be greater than s2, respectively.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
┌────────────────────────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├────────────────────────────┼───────────────┼────────────────┤
│strcasecmp(), strncasecmp() │ Thread safety │ MT-Safe locale │
└────────────────────────────┴───────────────┴────────────────┘
CONFORMING TO
4.4BSD, POSIX.1-2001, POSIX.1-2008.
NOTES
The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD,
where they were declared in <string.h>. Thus, for reasons of histori‐
cal compatibility, the glibc <string.h> header file also declares these
functions, if the _DEFAULT_SOURCE (or, in glibc 2.19 and earlier,
_BSD_SOURCE) feature test macro is defined.
The POSIX.1-2008 standard says of these functions:
When the LC_CTYPE category of the locale being used is from the
POSIX locale, these functions shall behave as if the strings had
been converted to lowercase and then a byte comparison per‐
formed. Otherwise, the results are unspecified.
SEE ALSObcmp(3), memcmp(3), strcmp(3), strcoll(3), string(3), strncmp(3),
wcscasecmp(3), wcsncasecmp(3)COLOPHON
This page is part of release 4.14 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2017-09-15 STRCASECMP(3)
