2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
115 lines
3.4 KiB
Groff
115 lines
3.4 KiB
Groff
.\" $NetBSD: bm.3,v 1.8 2006/10/16 08:48:45 wiz Exp $
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.\"
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.\" Copyright (c) 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Andrew Hume of AT&T Bell Laboratories.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)bm.3 8.4 (Berkeley) 6/21/94
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.\"
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.Dd April 8, 2001
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.Dt BM 3
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.Os
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.Sh NAME
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.Nm bm_comp ,
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.Nm bm_exec ,
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.Nm bm_free
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.Nd Boyer-Moore string search
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In bm.h
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.Ft bm_pat *
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.Fn bm_comp "u_char *pattern" "size_t patlen" "u_char freq[256]"
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.Ft u_char *
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.Fn bm_exec "bm_pat *pdesc" "u_char *text" "size_t len"
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.Ft void
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.Fn bm_free "bm_pat *pdesc"
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.Sh DESCRIPTION
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These routines implement an efficient mechanism to find an
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occurrence of a byte string within another byte string.
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.Pp
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.Fn bm_comp
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evaluates the
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.Fa patlen
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bytes starting at
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.Fa pattern ,
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and returns a pointer to a structure describing them.
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The bytes referenced by
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.Fa pattern
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may be of any value.
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.Pp
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The search takes advantage of the frequency distribution of the
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bytes in the text to be searched.
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If specified,
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.Fa freq
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should be an array of 256 values,
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with higher values indicating that the corresponding character occurs
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more frequently.
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(A less than optimal frequency distribution can only result in less
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than optimal performance, not incorrect results.)
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If
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.Fa freq
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is
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.Dv NULL ,
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a system default table is used.
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.Pp
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.Fn bm_exec
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returns a pointer to the leftmost occurrence of the string given to
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.Fn bm_comp
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within
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.Fa text ,
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or
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.Dv NULL
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if none occurs.
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The number of bytes in
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.Fa text
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must be specified by
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.Fa len .
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.Pp
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Space allocated for the returned description is discarded
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by calling
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.Fn bm_free
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with the returned description as an argument.
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.Pp
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The asymptotic speed of
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.Fn bm_exec
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is O(len/patlen).
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.Sh SEE ALSO
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.Xr regexp 3 ,
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.Xr strstr 3
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.Rs
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.%A Hume and Sunday
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.%D November 1991
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.%J "Software Practice and Experience"
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.%P pp. 1221-48
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.%T "Fast String Searching"
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.%V Vol. 21, 11
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.Re
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