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strncmp(3) [v7 man page]

STRCMP(3)						     Linux Programmer's Manual							 STRCMP(3)

NAME
strcmp, strncmp - compare two strings SYNOPSIS
#include <string.h> int strcmp(const char *s1, const char *s2); int strncmp(const char *s1, const char *s2, size_t n); DESCRIPTION
The strcmp() function compares the two strings s1 and s2. 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 strncmp() function is similar, except it compares only the first (at most) n bytes of s1 and s2. RETURN VALUE
The strcmp() and strncmp() functions return an integer less than, equal to, or greater than zero if s1 (or the first n bytes thereof) is found, respectively, to be less than, to match, or be greater than s2. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +--------------------+---------------+---------+ |Interface | Attribute | Value | +--------------------+---------------+---------+ |strcmp(), strncmp() | Thread safety | MT-Safe | +--------------------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. SEE ALSO
bcmp(3), memcmp(3), strcasecmp(3), strcoll(3), string(3), strncasecmp(3), strverscmp(3), wcscmp(3), wcsncmp(3) COLOPHON
This page is part of release 4.15 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/. 2015-08-08 STRCMP(3)

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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 his- torical compatibility, the glibc <string.h> header file also declares these functions, if the _DEFAULT_SOURCE (or, in glibc 2.19 and ear- lier, _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. SEE ALSO
bcmp(3), memcmp(3), strcmp(3), strcoll(3), string(3), strncmp(3), wcscasecmp(3), wcsncasecmp(3) COLOPHON
This page is part of release 4.15 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)
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