сравнить две строки без учета регистра (compare two strings ignoring case)
Имя (Name)
strcasecmp, strncasecmp - compare two strings ignoring case
Синопсис (Synopsis)
#include <strings.h>
int strcasecmp(const char *s1, const char *s2);
int strncasecmp(const char *s1, const char *s2, size_t n);
Описание (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.
Возвращаемое значение (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.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├───────────────────────────────┼───────────────┼────────────────┤
│strcasecmp(), strncasecmp() │ Thread safety │ MT-Safe locale │
└───────────────────────────────┴───────────────┴────────────────┘
Стандарты (Conforming to)
4.4BSD, POSIX.1-2001, POSIX.1-2008.
Примечание (Note)
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.
Смотри также (See also)
bcmp(3), memcmp(3), strcmp(3), strcoll(3), string(3), strncmp(3),
wcscasecmp(3), wcsncasecmp(3)
