нечувствительные сравнения строк (insensitive string comparisons)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
strcasecmp, strcasecmp_l, strncasecmp, strncasecmp_l — case-
insensitive string comparisons
Синопсис (Synopsis)
#include <strings.h>
int strcasecmp(const char *s1, const char *s2);
int strcasecmp_l(const char *s1, const char *s2,
locale_t locale);
int strncasecmp(const char *s1, const char *s2, size_t n);
int strncasecmp_l(const char *s1, const char *s2,
size_t n, locale_t locale);
Описание (Description)
The strcasecmp() and strcasecmp_l() functions shall compare,
while ignoring differences in case, the string pointed to by s1
to the string pointed to by s2. The strncasecmp() and
strncasecmp_l() functions shall compare, while ignoring
differences in case, not more than n bytes from the string
pointed to by s1 to the string pointed to by s2.
The strcasecmp() and strncasecmp() functions use the current
locale to determine the case of the characters.
The strcasecmp_l() and strncasecmp_l() functions use the locale
represented by locale to determine the case of the characters.
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.
The behavior is undefined if the locale argument to
strcasecmp_l() or strncasecmp_l() is the special locale object
LC_GLOBAL_LOCALE or is not a valid locale object handle.
Возвращаемое значение (Return value)
Upon completion, strcasecmp() and strcasecmp_l() shall return an
integer greater than, equal to, or less than 0, if the string
pointed to by s1 is, ignoring case, greater than, equal to, or
less than the string pointed to by s2, respectively.
Upon successful completion, strncasecmp() and strncasecmp_l()
shall return an integer greater than, equal to, or less than 0,
if the possibly null-terminated array pointed to by s1 is,
ignoring case, greater than, equal to, or less than the possibly
null-terminated array pointed to by s2, respectively.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
wcscasecmp(3p)
The Base Definitions volume of POSIX.1‐2017, strings.h(0p)
