85 lines
1.6 KiB
Groff
85 lines
1.6 KiB
Groff
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.\" Copyright (c) 1983 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)bstring.3 6.1 (Berkeley) 5/15/85
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.\"
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.TH BSTRING 3 "May 15, 1985"
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.UC 5
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.SH NAME
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bstring, bcopy, bcmp, bzero, ffs \- bit and byte string operations
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.SH SYNOPSIS
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.nf
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.ft B
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#include <sys/types.h>
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#include <string.h>
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#include <unistd.h>
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void bcopy(const void *\fIsrc\fP, void *\fIdst\fP, size_t \fIlength\fP)
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int bcmp(const void *\fIb1\fP, const void *\fIb2\fP, size_t \fIlength\fP)
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void bzero(void *\fIdst\fP, size_t \fIlength\fP)
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int ffs(int \fIi\fP)
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.ft R
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.fi
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.SH DESCRIPTION
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The functions
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.BR bcopy ,
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.BR bcmp ,
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and
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.B bzero
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operate on variable length strings of bytes.
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They do not check for null bytes as the routines in
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.BR string (3)
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do.
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.PP
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.B Bcopy
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copies
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.I length
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bytes from string
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.I src
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to the string
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.IR dst .
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.PP
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.B Bcmp
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compares byte string
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.I b1
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against byte string
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.IR b2 ,
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returning zero if they are identical,
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non-zero otherwise. Both strings are
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assumed to be
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.I length
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bytes long.
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.PP
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.B Bzero
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places
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.I length
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0 bytes in the string
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.IR b1 .
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.PP
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.B Ffs
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find the first bit set in the argument passed it and
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returns the index of that bit. Bits are numbered
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starting at 1. A return value of 0 indicates the
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value passed is zero.
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.SH BUGS
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The
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.BR bcopy ,
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.BR bcmp ,
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and
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.BR bzero
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functions are obsolete; new code should use
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.BR memmove ,
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.BR memcmp ,
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and
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.BR memset
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respectively.
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.PP
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The
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.B bcopy
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routine takes parameters backwards from
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.BR memcpy ,
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.BR memmove ,
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and
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.BR strcpy .
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