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
149 lines
4.2 KiB
Groff
149 lines
4.2 KiB
Groff
.\" $NetBSD: fparseln.3,v 1.4 2009/10/21 01:07:45 snj Exp $
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.\"
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.\" Copyright (c) 1997 Christos Zoulas. 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd November 30, 2002
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.Dt FPARSELN 3
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.Os
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.Sh NAME
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.Nm fparseln
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.Nd return the next logical line from a stream
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdio.h
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.Ft "char *"
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.Fo "fparseln"
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.Fa "FILE *stream" "size_t *len" "size_t *lineno"
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.Fa "const char delim[3]" "int flags"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn fparseln
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function
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returns a pointer to the next logical line from the stream referenced by
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.Fa stream .
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This string is
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.Dv NUL
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terminated and it is dynamically allocated on each invocation.
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It is the responsibility of the caller to free the pointer.
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.Pp
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By default, if a character is escaped, both it and the preceding escape
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character will be present in the returned string.
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Various
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.Fa flags
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alter this behaviour.
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.Pp
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The meaning of the arguments is as follows:
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.Bl -tag -width "lineno"
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.It Fa stream
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The stream to read from.
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.It Fa len
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If not
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.Dv NULL ,
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the length of the string is stored in the memory location to which it
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points.
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.It Fa lineno
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If not
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.Dv NULL ,
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the value of the memory location to which is pointed to, is incremented
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by the number of lines actually read from the file.
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.It Fa delim
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Contains the escape, continuation, and comment characters.
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If a character is
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.Dv NUL
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then processing for that character is disabled.
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If
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.Dv NULL ,
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all characters default to values specified below.
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The contents of
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.Fa delim
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is as follows:
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.Bl -tag -width "delim[0]"
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.It Fa delim[0]
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The escape character, which defaults to
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.Cm \e ,
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is used to remove any special meaning from the next character.
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.It Fa delim[1]
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The continuation character, which defaults to
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.Cm \e ,
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is used to indicate that the next line should be concatenated with the
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current one if this character is the last character on the current line
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and is not escaped.
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.It Fa delim[2]
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The comment character, which defaults to
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.Cm # ,
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if not escaped indicates the beginning of a comment that extends until the
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end of the current line.
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.El
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.It Fa flags
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If non-zero, alter the operation of
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.Fn fparseln .
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The various flags, which may be
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.Em or Ns -ed
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together, are:
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.Bl -tag -width "FPARSELN_UNESCCOMM"
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.It Dv FPARSELN_UNESCCOMM
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Remove escape preceding an escaped comment.
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.It Dv FPARSELN_UNESCCONT
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Remove escape preceding an escaped continuation.
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.It Dv FPARSELN_UNESCESC
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Remove escape preceding an escaped escape.
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.It Dv FPARSELN_UNESCREST
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Remove escape preceding any other character.
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.It Dv FPARSELN_UNESCALL
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All of the above.
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.El
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.Pp
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.El
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.Sh RETURN VALUES
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Upon successful completion a pointer to the parsed line is returned;
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otherwise,
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.Dv NULL
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is returned.
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.Pp
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The
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.Fn fparseln
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function uses internally
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.Xr fgetln 3 ,
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so all error conditions that apply to
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.Xr fgetln 3 ,
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apply to
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.Fn fparseln .
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In addition
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.Fn fparseln
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may set
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.Va errno
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to
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.Bq Er ENOMEM
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and return
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.Dv NULL
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if it runs out of memory.
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.Sh SEE ALSO
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.Xr fgetln 3
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.Sh HISTORY
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The
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.Fn fparseln
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function first appeared in
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.Nx 1.4 .
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