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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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STRCASECMP(3P) POSIX Programmer's Manual STRCASECMP(3P)
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.
strcasecmp, strcasecmp_l, strncasecmp, strncasecmp_l — case-
insensitive string comparisons
#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);
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.
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.
No errors are defined.
The following sections are informative.
None.
None.
None.
None.
wcscasecmp(3p)
The Base Definitions volume of POSIX.1‐2017, strings.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
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 .
IEEE/The Open Group 2017 STRCASECMP(3P)
Pages that refer to this page: strings.h(0p), strncasecmp(3p), wcscasecmp(3p)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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