strcasecmp, strncasecmp - compare two strings ignoring case
The strcasecmp() function performs a byte-by-byte comparison of the strings
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
The strncasecmp() function is similar, except that it compares no more than
n bytes of
4.4BSD, POSIX.1-2001, POSIX.1-2008.
The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD, where they were declared in
<string.h>. Thus, for reasons of historical 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 performed. Otherwise, the results are unspecified.
This page is part of release 5.10 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/.