memcmp3
Compare bytes in memory
Usage
#include <string.h>
int
memcmp(const void *b1, const void *b2, size_t len);
Library
Standard C Library (libc, -lc)
Overview
The memcmp() function compares byte object b1 against byte object b2. Both objects are assumed to be len bytes long.
Return values
The memcmp() function returns zero if the two objects are identical. Zero-length objects are considered identical. The memcmp() function returns a negative value if the first differing byte has a lower value in b1 and a positive value if the first differing byte has a higher value in b1.
Caveats
If the objects differ, the C library memcmp() implementation returns the difference between the first two differing bytes (treated as unsigned char values). This behavior is not specified by ISO/IEC 9899:1990 (“ISO C90”), is not portable, and may not occur in light of compiler optimizations.
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 43 times.