strncmp(3p) — Linux manual page

PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

STRNCMP(3P)             POSIX Programmer's Manual            STRNCMP(3P)

PROLOG         top

       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.

NAME         top

       strncmp — compare part of two strings

SYNOPSIS         top

       #include <string.h>

       int strncmp(const char *s1, const char *s2, size_t n);

DESCRIPTION         top

       The functionality described on this reference page is aligned
       with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This
       volume of POSIX.1‐2017 defers to the ISO C standard.

       The strncmp() function shall compare not more than n bytes (bytes
       that follow a NUL character are not compared) from the array
       pointed to by s1 to the array pointed to by s2.

       The sign of a non-zero return value is determined by the sign of
       the difference between the values of the first pair of bytes
       (both interpreted as type unsigned char) that differ in the
       strings being compared.

RETURN VALUE         top

       Upon successful completion, strncmp() shall return an integer
       greater than, equal to, or less than 0, if the possibly null-
       terminated array pointed to by s1 is greater than, equal to, or
       less than the possibly null-terminated array pointed to by s2
       respectively.

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       strcmp(3p)

       The Base Definitions volume of POSIX.1‐2017, string.h(0p)

COPYRIGHT         top

       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                       STRNCMP(3P)

Pages that refer to this page: string.h(0p)strcmp(3p)