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Add getbsize() function
Import code from DragonFlyBSD and man page from FreeBSD.
This commit is contained in:
Guillem Jover
parent
a88bb8380d
commit
e8f9300355
@ -70,6 +70,8 @@ void *reallocf(void *ptr, size_t size);
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long long strtonum(const char *nptr, long long minval, long long maxval,
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const char **errstr);
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char *getbsize(int *headerlenp, long *blocksizep);
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__END_DECLS
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#endif
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@ -29,6 +29,7 @@ dist_man_MANS = \
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fmtcheck.3 \
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fparseln.3 \
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funopen.3 \
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getbsize.3 \
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getmode.3 \
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getpeereid.3 \
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getprogname.3 \
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95
man/getbsize.3
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95
man/getbsize.3
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@ -0,0 +1,95 @@
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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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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.\" @(#)getbsize.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd November 16, 2012
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.Dt GETBSIZE 3
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.Os
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.Sh NAME
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.Nm getbsize
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.Nd get preferred block size
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.Sh LIBRARY
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.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
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.Lb libbsd
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.Sh SYNOPSIS
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.In bsd/stdlib.h
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.Ft char *
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.Fn getbsize "int *headerlenp" "long *blocksizep"
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.Sh DESCRIPTION
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The
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.Fn getbsize
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function returns a preferred block size for reporting by system utilities
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.Xr df 1 ,
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.Xr du 1 ,
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.Xr ls 1
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and
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.Xr systat 1 ,
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based on the value of the
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.Ev BLOCKSIZE
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environment variable.
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.Ev BLOCKSIZE
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may be specified directly in bytes, or in multiples of a kilobyte by
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specifying a number followed by ``K'' or ``k'', in multiples of a
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megabyte by specifying a number followed by ``M'' or ``m'' or in
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multiples of a gigabyte by specifying a number followed by ``G'' or
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``g''.
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Multiples must be integers.
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.Pp
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Valid values of
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.Ev BLOCKSIZE
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are 512 bytes to 1 gigabyte.
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Sizes less than 512 bytes are rounded up to 512 bytes, and sizes
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greater than 1 GB are rounded down to 1 GB.
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In each case
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.Fn getbsize
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produces a warning message.
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.Pp
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The
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.Fn getbsize
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function returns a pointer to a null-terminated string describing
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the block size, something like
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.Dq 1K-blocks .
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The memory referenced by
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.Fa headerlenp
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is filled in with the length of the string (not including the
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terminating null).
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The memory referenced by
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.Fa blocksizep
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is filled in with block size, in bytes.
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.Sh SEE ALSO
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.Xr df 1 ,
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.Xr du 1 ,
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.Xr ls 1 ,
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.Xr systat 1 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Fn getbsize
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function first appeared in
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.Bx 4.4 .
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@ -52,6 +52,7 @@ libbsd_la_SOURCES = \
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fparseln.c \
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fpurge.c \
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funopen.c \
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getbsize.c \
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getpeereid.c \
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hash/md5.c \
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hash/md5hl.c \
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102
src/getbsize.c
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102
src/getbsize.c
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@ -0,0 +1,102 @@
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)getbsize.c 8.1 (Berkeley) 6/4/93
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* $FreeBSD: src/lib/libc/gen/getbsize.c,v 1.9 2008/08/04 06:53:13 cperciva Exp $
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* $DragonFly: src/lib/libc/gen/getbsize.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
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*/
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char *
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getbsize(int *headerlenp, long *blocksizep)
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{
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static char header[20];
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long n, max, mul, blocksize;
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char *ep, *p;
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const char *form;
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#define KB (1024L)
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#define MB (1024L * 1024L)
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#define GB (1024L * 1024L * 1024L)
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#define MAXB GB /* No tera, peta, nor exa. */
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form = "";
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if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
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if ((n = strtol(p, &ep, 10)) < 0)
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goto underflow;
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if (n == 0)
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n = 1;
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if (*ep && ep[1])
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goto fmterr;
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switch (*ep) {
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case 'G': case 'g':
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form = "G";
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max = MAXB / GB;
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mul = GB;
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break;
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case 'K': case 'k':
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form = "K";
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max = MAXB / KB;
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mul = KB;
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break;
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case 'M': case 'm':
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form = "M";
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max = MAXB / MB;
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mul = MB;
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break;
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case '\0':
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max = MAXB;
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mul = 1;
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break;
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default:
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fmterr: warnx("%s: unknown blocksize", p);
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n = 512;
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max = MAXB;
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mul = 1;
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break;
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}
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if (n > max) {
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warnx("maximum blocksize is %ldG", MAXB / GB);
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n = max;
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}
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if ((blocksize = n * mul) < 512) {
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underflow: warnx("minimum blocksize is 512");
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form = "";
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blocksize = n = 512;
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}
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} else
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blocksize = n = 512;
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snprintf(header, sizeof(header), "%ld%s-blocks", n, form);
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*headerlenp = strlen(header);
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*blocksizep = blocksize;
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return (header);
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}
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@ -112,6 +112,8 @@ LIBBSD_0.6 {
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} LIBBSD_0.5;
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LIBBSD_0.7 {
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getbsize;
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funopen;
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_time32_to_time;
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