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| [9] | 1 | .\" Copyright (c) 1983 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)bstring.3 6.1 (Berkeley) 5/15/85
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| 6 | .\"
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| 7 | .TH BSTRING 3 "May 15, 1985"
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| 8 | .UC 5
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| 9 | .SH NAME
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| 10 | bstring, bcopy, bcmp, bzero, ffs \- bit and byte string operations
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <sys/types.h>
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| 15 | #include <string.h>
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| 16 | #include <unistd.h>
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| 17 |
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| 18 | void bcopy(const void *\fIsrc\fP, void *\fIdst\fP, size_t \fIlength\fP)
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| 19 | int bcmp(const void *\fIb1\fP, const void *\fIb2\fP, size_t \fIlength\fP)
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| 20 | void bzero(void *\fIdst\fP, size_t \fIlength\fP)
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| 21 | int ffs(int \fIi\fP)
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| 22 | .ft R
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| 23 | .fi
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| 24 | .SH DESCRIPTION
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| 25 | The functions
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| 26 | .BR bcopy ,
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| 27 | .BR bcmp ,
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| 28 | and
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| 29 | .B bzero
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| 30 | operate on variable length strings of bytes.
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| 31 | They do not check for null bytes as the routines in
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| 32 | .BR string (3)
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| 33 | do.
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| 34 | .PP
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| 35 | .B Bcopy
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| 36 | copies
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| 37 | .I length
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| 38 | bytes from string
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| 39 | .I src
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| 40 | to the string
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| 41 | .IR dst .
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| 42 | .PP
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| 43 | .B Bcmp
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| 44 | compares byte string
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| 45 | .I b1
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| 46 | against byte string
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| 47 | .IR b2 ,
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| 48 | returning zero if they are identical,
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| 49 | non-zero otherwise. Both strings are
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| 50 | assumed to be
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| 51 | .I length
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| 52 | bytes long.
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| 53 | .PP
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| 54 | .B Bzero
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| 55 | places
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| 56 | .I length
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| 57 | 0 bytes in the string
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| 58 | .IR b1 .
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| 59 | .PP
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| 60 | .B Ffs
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| 61 | find the first bit set in the argument passed it and
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| 62 | returns the index of that bit. Bits are numbered
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| 63 | starting at 1. A return value of 0 indicates the
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| 64 | value passed is zero.
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| 65 | .SH BUGS
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| 66 | The
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| 67 | .BR bcopy ,
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| 68 | .BR bcmp ,
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| 69 | and
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| 70 | .BR bzero
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| 71 | functions are obsolete; new code should use
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| 72 | .BR memmove ,
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| 73 | .BR memcmp ,
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| 74 | and
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| 75 | .BR memset
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| 76 | respectively.
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| 77 | .PP
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| 78 | The
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| 79 | .B bcopy
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| 80 | routine takes parameters backwards from
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| 81 | .BR memcpy ,
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| 82 | .BR memmove ,
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| 83 | and
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| 84 | .BR strcpy .
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