|STRCASECMP(3P)||POSIX Programmer's Manual||STRCASECMP(3P)|
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);
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.
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.
The following sections are informative.
The Base Definitions volume of POSIX.1‐2017, <strings.h>
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
|2017||IEEE/The Open Group|