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ffs(3) [bsd man page]

BSTRING(3)						     Library Functions Manual							BSTRING(3)

NAME
bcopy, bcmp, bzero, ffs - bit and byte string operations SYNOPSIS
bcopy(src, dst, length) char *src, *dst; int length; bcmp(b1, b2, length) char *b1, *b2; int length; bzero(b, length) char *b; int length; ffs(i) long i; DESCRIPTION
The functions bcopy, bcmp, and bzero operate on variable length strings of bytes. They do not check for null bytes as the routines in string(3) do. Bcopy copies length bytes from string src to the string dst. Bcmp compares byte string b1 against byte string b2, returning zero if they are identical, non-zero otherwise. Both strings are assumed to be length bytes long. Bzero places length 0 bytes in the string b1. Ffs find the first bit set in the argument passed it and returns the index of that bit. Bits are numbered starting at 1. A return value of 0 indicates the value passed is zero. BUGS
The bcopy routine take parameters backwards from strcpy. 4.2 Berkeley Distribution May 15, 1985 BSTRING(3)

Check Out this Related Man Page

bcopy(3)						     Library Functions Manual							  bcopy(3)

NAME
bcopy, bcmp, bzero - Perform memory operations LIBRARY
Standard C Library (libc) SYNOPSIS
#include <strings.h> void bcopy( const void *source, void *destination, size_t length); int bcmp( const void *string1, const void *string2, size_t length); void bzero( void *string, size_t length); The following function definitions do not conform to current standards and are supported only for backward compatibility: #include <string.h> void bcopy( const char *source, char *destination, int length); int bcmp( const char *string1, const char *string2, int length); void bzero( char *string, int length); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: bcopy(), bcmp(), bzero(): XSH5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Points to the original string for the bcopy() function. Points to the destination string for the bcopy() function. Specifies the byte string to be compared to the string2 parameter by the bcmp() function. Specifies the byte string to be compared to the string1 parameter by the bcmp() function. Specifies the length (in bytes) of the string. DESCRIPTION
The bcopy(), bcmp(), and bzero() functions operate on variable length strings of bytes. Unlike the string functions, they do not check for null bytes. The bcopy() function copies the value of the length parameter in bytes from the string in the source parameter to the string in the desti- nation parameter. The bcmp() function compares the byte string in the string1 parameter against the byte string of the string2 parameter, returning a 0 (zero) value if the two strings are identical and a nonzero value otherwise. The bzero() function nulls the string in the string parameter, for the value of the length parameter in bytes. NOTES
[Tru64 UNIX] The bcopy() function is similar to the memcpy() function except that the first two parameters are reversed. RELATED INFORMATION
Functions: memccpy(3), memcpy(3), string(3), swab(3) Standards: standards(5) delim off bcopy(3)
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