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
208 lines
5.7 KiB
Groff
208 lines
5.7 KiB
Groff
.\" $NetBSD: unvis.3,v 1.20 2010/11/28 01:28:21 wiz Exp $
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.\"
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.\" Copyright (c) 1989, 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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.\" @(#)unvis.3 8.2 (Berkeley) 12/11/93
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.\"
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.Dd November 27, 2010
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.Dt UNVIS 3
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.Os
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.Sh NAME
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.Nm unvis ,
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.Nm strunvis
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.Nd decode a visual representation of characters
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In vis.h
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.Ft int
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.Fn unvis "char *cp" "int c" "int *astate" "int flag"
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.Ft int
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.Fn strunvis "char *dst" "const char *src"
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.Ft int
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.Fn strunvisx "char *dst" "const char *src" "int flag"
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.Sh DESCRIPTION
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The
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.Fn unvis ,
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.Fn strunvis
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and
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.Fn strunvisx
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functions
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are used to decode a visual representation of characters, as produced
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by the
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.Xr vis 3
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function, back into
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the original form.
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.Pp
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The
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.Fn unvis
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function is called with successive characters in
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.Ar c
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until a valid sequence is recognized, at which time the decoded
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character is available at the character pointed to by
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.Ar cp .
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.Pp
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The
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.Fn strunvis
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function decodes the characters pointed to by
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.Ar src
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into the buffer pointed to by
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.Ar dst .
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The
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.Fn strunvis
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function simply copies
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.Ar src
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to
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.Ar dst ,
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decoding any escape sequences along the way,
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and returns the number of characters placed into
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.Ar dst ,
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or \-1 if an
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invalid escape sequence was detected.
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The size of
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.Ar dst
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should be equal to the size of
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.Ar src
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(that is, no expansion takes place during decoding).
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.Pp
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The
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.Fn strunvisx
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function does the same as the
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.Fn strunvis
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function,
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but it allows you to add a flag that specifies the style the string
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.Ar src
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is encoded with.
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Currently, the supported flags are:
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.Dv VIS_HTTPSTYLE
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and
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.Dv VIS_MIMESTYLE .
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.Pp
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The
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.Fn unvis
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function implements a state machine that can be used to decode an
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arbitrary stream of bytes.
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All state associated with the bytes being decoded is stored outside the
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.Fn unvis
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function (that is, a pointer to the state is passed in), so
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calls decoding different streams can be freely intermixed.
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To start decoding a stream of bytes, first initialize an integer to zero.
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Call
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.Fn unvis
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with each successive byte, along with a pointer
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to this integer, and a pointer to a destination character.
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The
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.Fn unvis
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function has several return codes that must be handled properly.
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They are:
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.Bl -tag -width UNVIS_VALIDPUSH
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.It Li \&0 (zero)
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Another character is necessary; nothing has been recognized yet.
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.It Dv UNVIS_VALID
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A valid character has been recognized and is available at the location
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pointed to by cp.
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.It Dv UNVIS_VALIDPUSH
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A valid character has been recognized and is available at the location
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pointed to by cp; however, the character currently passed in should
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be passed in again.
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.It Dv UNVIS_NOCHAR
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A valid sequence was detected, but no character was produced.
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This return code is necessary to indicate a logical break between characters.
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.It Dv UNVIS_SYNBAD
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An invalid escape sequence was detected, or the decoder is in an unknown state.
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The decoder is placed into the starting state.
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.El
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.Pp
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When all bytes in the stream have been processed, call
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.Fn unvis
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one more time with flag set to
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.Dv UNVIS_END
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to extract any remaining character (the character passed in is ignored).
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.Pp
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The
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.Ar flag
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argument is also used to specify the encoding style of the source.
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If set to
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.Dv VIS_HTTPSTYLE
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or
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.Dv VIS_HTTP1808 ,
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.Fn unvis
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will decode URI strings as specified in RFC 1808.
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If set to
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.Dv VIS_HTTP1866 ,
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.Fn unvis
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will decode URI strings as specified in RFC 1866.
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If set to
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.Dv VIS_MIMESTYLE ,
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.Fn unvis
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will decode MIME Quoted-Printable strings as specified in RFC 2045.
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If set to
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.Dv VIS_NOESCAPE ,
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.Fn unvis
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will not decode \e quoted characters.
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.Pp
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The following code fragment illustrates a proper use of
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.Fn unvis .
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.Bd -literal -offset indent
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int state = 0;
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char out;
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while ((ch = getchar()) != EOF) {
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again:
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switch(unvis(\*[Am]out, ch, \*[Am]state, 0)) {
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case 0:
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case UNVIS_NOCHAR:
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break;
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case UNVIS_VALID:
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(void)putchar(out);
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break;
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case UNVIS_VALIDPUSH:
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(void)putchar(out);
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goto again;
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case UNVIS_SYNBAD:
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errx(EXIT_FAILURE, "Bad character sequence!");
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}
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}
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if (unvis(\*[Am]out, '\e0', \*[Am]state, UNVIS_END) == UNVIS_VALID)
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(void)putchar(out);
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.Ed
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.Sh SEE ALSO
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.Xr unvis 1 ,
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.Xr vis 1 ,
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.Xr vis 3
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.Rs
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.%A R. Fielding
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.%T Relative Uniform Resource Locators
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.%O RFC1808
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.Re
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.Sh HISTORY
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The
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.Fn unvis
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function
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first appeared in
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.Bx 4.4 .
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