int strncmp(const char *s1, const char *s2,
The strncmp() function shall compare not more than n bytes
(bytes that follow a null byte 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.
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.
No errors are defined.
The following sections are informative.
strcmp() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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