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
162 lines
4.5 KiB
Groff
162 lines
4.5 KiB
Groff
.\" Copyright (c) 1988, 1991, 1993
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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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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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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: @(#)strtok.3 8.2 (Berkeley) 2/3/94
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.\" $NetBSD: strtok.3,v 1.23 2008/08/29 05:48:40 dholland Exp $
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.\"
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.Dd August 11, 2002
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.Dt STRTOK 3
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.Os
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.Sh NAME
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.Nm strtok, strtok_r
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.Nd string tokens
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In string.h
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.Ft char *
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.Fn strtok "char * restrict str" "const char * restrict sep"
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.Ft char *
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.Fn strtok_r "char *str" "const char *sep" "char **lasts"
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.Sh DESCRIPTION
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The
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.Fn strtok
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function
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is used to isolate sequential tokens in a nul-terminated string,
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.Fa str .
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These tokens are separated in the string by at least one of the
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characters in
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.Fa sep .
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The first time that
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.Fn strtok
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is called,
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.Fa str
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should be specified; subsequent calls, wishing to obtain further tokens
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from the same string, should pass a null pointer instead.
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The separator string,
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.Fa sep ,
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must be supplied each time, and may change between calls.
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.Pp
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The
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.Fn strtok
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function
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returns a pointer to the beginning of each subsequent token in the string,
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after replacing the separator character itself with a
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.Dv NUL
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character.
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Separator characters at the beginning of the string or at the
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continuation point are skipped so that zero length tokens
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are not returned.
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When no more tokens remain, a null pointer is returned.
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.Pp
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The
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.Fn strtok_r
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function implements the functionality of
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.Fn strtok
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but is passed an additional argument,
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.Fa lasts ,
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which points to a user-provided pointer which is used by
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.Fn strtok_r
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to store state which needs to be kept between calls to scan the same string;
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unlike
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.Fn strtok ,
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it is not necessary to limit tokenizing to a single string at a time
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when using
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.Fn strtok_r .
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.Sh EXAMPLES
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The following will construct an array of pointers to each individual word in
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the string
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.Va s :
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.Bd -literal -offset indent
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#define MAXTOKENS 128
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char s[512], *p, *tokens[MAXTOKENS];
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char *last;
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int i = 0;
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snprintf(s, sizeof(s), "cat dog horse cow");
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for ((p = strtok_r(s, " ", &last)); p;
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(p = strtok_r(NULL, " ", &last)), i++) {
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if (i < MAXTOKENS - 1)
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tokens[i] = p;
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}
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tokens[i] = NULL;
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.Ed
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.Pp
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That is,
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.Li tokens[0]
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will point to
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.Qq cat ,
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.Li tokens[1]
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will point to
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.Qq dog ,
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.Li tokens[2]
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will point to
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.Qq horse ,
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and
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.Li tokens[3]
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will point to
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.Qq cow .
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.Sh SEE ALSO
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.Xr index 3 ,
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.Xr memchr 3 ,
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.Xr rindex 3 ,
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.Xr strchr 3 ,
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.Xr strcspn 3 ,
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.Xr strpbrk 3 ,
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.Xr strrchr 3 ,
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.Xr strsep 3 ,
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.Xr strspn 3 ,
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.Xr strstr 3
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.Sh STANDARDS
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The
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.Fn strtok
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function
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conforms to
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.St -ansiC .
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The
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.Fn strtok_r
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function conforms to
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.St -p1003.1c-95 .
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.Sh BUGS
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The System V
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.Fn strtok ,
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if handed a string containing only delimiter characters,
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will not alter the next starting point, so that a call to
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.Fn strtok
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with a different (or empty) delimiter string
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may return a
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.Pf non- Dv NULL
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value.
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Since this implementation always alters the next starting point,
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such a sequence of calls would always return
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.Dv NULL .
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