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remove the never used bm string functions

OPENBSD_5_6
tedu 10 years ago
parent
85309b05df
commit
661d769f4e
3 changed files with 3 additions and 329 deletions
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  1. +3
    -4
      src/lib/libc/string/Makefile.inc
  2. +0
    -120
      src/lib/libc/string/bm.3
  3. +0
    -205
      src/lib/libc/string/bm.c

+ 3
- 4
src/lib/libc/string/Makefile.inc View File

@ -1,9 +1,9 @@
# $OpenBSD: Makefile.inc,v 1.33 2014/01/22 21:06:45 tedu Exp $
# $OpenBSD: Makefile.inc,v 1.34 2014/03/23 23:16:48 tedu Exp $
# string sources
.PATH: ${LIBCSRCDIR}/arch/${MACHINE_CPU}/string ${LIBCSRCDIR}/string
SRCS+= bm.c explicit_bzero.c memccpy.c memmem.c memrchr.c stpcpy.c stpncpy.c \
SRCS+= explicit_bzero.c memccpy.c memmem.c memrchr.c stpcpy.c stpncpy.c \
strcasecmp.c strcasestr.c strcoll.c strdup.c \
strerror.c strerror_r.c strlcat.c strmode.c strndup.c strnlen.c \
strsignal.c strtok.c strxfrm.c \
@ -144,7 +144,7 @@ strrchr.do: rindex.c
@mv ${.TARGET}.tmp ${.TARGET}
.endif
MAN+= bm.3 bcmp.3 bcopy.3 bstring.3 bzero.3 ffs.3 memccpy.3 memchr.3 \
MAN+= bcmp.3 bcopy.3 bstring.3 bzero.3 ffs.3 memccpy.3 memchr.3 \
memcmp.3 memcpy.3 memmem.3 memmove.3 memset.3 stpcpy.3 strcasecmp.3 \
strcat.3 strchr.3 strcmp.3 strcoll.3 strcpy.3 strcspn.3 strdup.3 \
strerror.3 string.3 strlen.3 strmode.3 strncat.3 strncpy.3 strpbrk.3 \
@ -154,7 +154,6 @@ MAN+= bm.3 bcmp.3 bcopy.3 bstring.3 bzero.3 ffs.3 memccpy.3 memchr.3 \
wcsstr.3 wcstok.3 wcswidth.3 wmemchr.3 wmemcmp.3 wmemcpy.3 wmemmove.3 \
wmemset.3
MLINKS+=bm.3 bm_comp.3 bm.3 bm_exec.3 bm.3 bm_free.3
MLINKS+=bzero.3 explicit_bzero.3
MLINKS+=memchr.3 memrchr.3
MLINKS+=stpcpy.3 stpncpy.3


+ 0
- 120
src/lib/libc/string/bm.3 View File

@ -1,120 +0,0 @@
.\" Copyright (c) 1994
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Andrew Hume of AT&T Bell Laboratories.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $OpenBSD: bm.3,v 1.12 2013/12/05 07:43:20 jmc Exp $
.\"
.Dd $Mdocdate: December 5 2013 $
.Dt BM 3
.Os
.Sh NAME
.Nm bm_comp ,
.Nm bm_exec ,
.Nm bm_free
.Nd Boyer-Moore string search
.Sh SYNOPSIS
.In sys/types.h
.In bm.h
.Ft bm_pat *
.Fn bm_comp "const unsigned char *pattern" "size_t patlen" \
"const unsigned char freq[256]"
.Ft unsigned char *
.Fn bm_exec "bm_pat *pdesc" "unsigned char *text" "size_t len"
.Ft void
.Fn bm_free "bm_pat *pdesc"
.Sh DESCRIPTION
These routines implement an efficient mechanism to find an
occurrence of a byte string within another byte string.
.Pp
.Fn bm_comp
evaluates
.Fa patlen
bytes starting at
.Fa pattern
and returns a pointer to a structure describing them.
The bytes referenced by
.Fa pattern
may be of any value.
.Pp
The search takes advantage of the frequency distribution of the
bytes in the text to be searched.
If specified,
.Ar freq
should be an array of 256 values,
with higher values indicating that the corresponding character occurs
more frequently.
(A less than optimal frequency distribution can only result in less
than optimal performance, not incorrect results.)
If
.Ar freq
is
.Dv NULL ,
a system default table is used.
.Pp
.Fn bm_exec
returns a pointer to the leftmost occurrence of the string given to
.Fn bm_comp
within
.Ar text ,
or
.Dv NULL
if none occurs.
The number of bytes in
.Ar text
must be specified by
.Ar len .
.Pp
Space allocated for the returned description is discarded
by calling
.Fn bm_free
with the returned description as an argument.
.Pp
The asymptotic speed of
.Fn bm_exec
is
.Pf O Ns Pq len / patlen .
.Sh SEE ALSO
.Xr regex 3 ,
.Xr strstr 3
.Rs
.%R "Fast String Searching"
.%A Andrew Hume
.%A Daniel Sunday
.%J "Software Practice and Experience"
.%V Volume 21, 11 (November 1991)
.%P 1221-48
.Re
.Sh HISTORY
The
.Fn bm_comp ,
.Fn bm_exec ,
and
.Fn bm_free
functions first appeared in
.Nx 1.0 .

+ 0
- 205
src/lib/libc/string/bm.c View File

@ -1,205 +0,0 @@
/* $OpenBSD: bm.c,v 1.7 2007/09/02 15:19:18 deraadt Exp $ */
/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Andrew Hume of AT&T Bell Laboratories.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <bm.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/*
* XXX
* The default frequency table starts at 99 and counts down. The default
* table should probably be oriented toward text, and will necessarily be
* locale specific. This one is for English. It was derived from the
* OSF/1 and 4.4BSD formatted and unformatted manual pages, and about 100Mb
* of email and random text. Change it if you can find something better.
*/
static u_char const freq_def[256] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 77, 90, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
99, 28, 42, 27, 16, 14, 20, 51,
66, 65, 59, 24, 75, 76, 84, 56,
72, 74, 64, 55, 54, 47, 41, 37,
44, 61, 70, 43, 23, 53, 49, 22,
33, 58, 40, 46, 45, 57, 60, 26,
30, 63, 21, 12, 32, 50, 38, 39,
34, 11, 48, 67, 62, 35, 15, 29,
71, 18, 9, 17, 25, 13, 10, 52,
36, 95, 78, 86, 87, 98, 82, 80,
88, 94, 19, 68, 89, 83, 93, 96,
81, 7, 91, 92, 97, 85, 69, 73,
31, 79, 8, 5, 4, 6, 3, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
bm_pat *
bm_comp(u_char const *pb, size_t len, u_char const *freq)
{
u_char const *pe, *p;
size_t *d, r;
int j;
int sv_errno;
bm_pat *pat;
if (len == 0) {
errno = EINVAL;
return (NULL);
}
if ((pat = malloc(sizeof(*pat))) == NULL)
return (NULL);
pat->pat = NULL;
pat->delta = NULL;
pat->patlen = len; /* copy pattern */
if ((pat->pat = malloc(pat->patlen)) == NULL)
goto mem;
memcpy(pat->pat, pb, pat->patlen);
/* get skip delta */
if ((pat->delta = calloc(256, sizeof(*d))) == NULL)
goto mem;
for (j = 0, d = pat->delta; j < 256; j++)
d[j] = pat->patlen;
for (pe = pb + pat->patlen - 1; pb <= pe; pb++)
d[*pb] = pe - pb;
if (freq == NULL) /* default freq table */
freq = freq_def;
r = 0; /* get guard */
for (pb = pat->pat, pe = pb + pat->patlen - 1; pb < pe; pb++)
if (freq[*pb] < freq[pat->pat[r]])
r = pb - pat->pat;
pat->rarec = pat->pat[r];
pat->rareoff = r - (pat->patlen - 1);
/* get md2 shift */
for (pe = pat->pat + pat->patlen - 1, p = pe - 1; p >= pat->pat; p--)
if (*p == *pe)
break;
/* *p is first leftward reoccurrence of *pe */
pat->md2 = pe - p;
return (pat);
mem: sv_errno = errno;
bm_free(pat);
errno = sv_errno;
return (NULL);
}
void
bm_free(bm_pat *pat)
{
if (pat->pat != NULL)
free(pat->pat);
if (pat->delta != NULL)
free(pat->delta);
free(pat);
}
u_char *
bm_exec(bm_pat *pat, u_char *base, size_t n)
{
u_char *e, *ep, *p, *q, *s;
size_t *d0, k, md2, n1, ro;
int rc;
if (n == 0)
return (NULL);
d0 = pat->delta;
n1 = pat->patlen - 1;
md2 = pat->md2;
ro = pat->rareoff;
rc = pat->rarec;
ep = pat->pat + pat->patlen - 1;
s = base + (pat->patlen - 1);
/* fast loop up to n - 3 * patlen */
e = base + n - 3 * pat->patlen;
while (s < e) {
k = d0[*s]; /* ufast skip loop */
while (k) {
k = d0[*(s += k)];
k = d0[*(s += k)];
}
if (s >= e)
break;
if (s[ro] != rc) /* guard test */
goto mismatch1;
/* fwd match */
for (p = pat->pat, q = s - n1; p < ep;)
if (*q++ != *p++)
goto mismatch1;
return (s - n1);
mismatch1: s += md2; /* md2 shift */
}
/* slow loop up to end */
e = base + n;
while (s < e) {
s += d0[*s]; /* step */
if (s >= e)
break;
if (s[ro] != rc) /* guard test */
goto mismatch2;
/* fwd match */
for (p = pat->pat, q = s - n1; p <= ep;)
if (*q++ != *p++)
goto mismatch2;
return (s - n1);
mismatch2: s += md2; /* md2 shift */
}
return (NULL);
}

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