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
97 lines
3.2 KiB
Groff
97 lines
3.2 KiB
Groff
.\" $NetBSD: fmtcheck.3,v 1.7 2009/03/09 19:24:26 joerg Exp $
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.\"
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.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This file was contributed to The NetBSD Foundation by Allen Briggs.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 17, 2000
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.Dt FMTCHECK 3
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.Os
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.Sh NAME
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.Nm fmtcheck
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.Nd sanitizes user-supplied printf(3)-style format string
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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 const char *
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.Fn fmtcheck "const char *fmt_suspect" "const char *fmt_default"
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.Sh DESCRIPTION
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The
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.Nm
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function scans
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.Fa fmt_suspect
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and
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.Fa fmt_default
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to determine if
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.Fa fmt_suspect
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will consume the same argument types as
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.Fa fmt_default
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and to ensure that
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.Fa fmt_suspect
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is a valid format string.
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.Pp
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The
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.Xr printf 3
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family of functions can not verify the types of arguments that they are
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passed at run-time.
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In some cases, like
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.Xr catgets 3 ,
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it is useful or necessary to use a user-supplied format string with no
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guarantee that the format string matches the specified parameters.
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.Pp
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The
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.Nm
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function was designed to be used in these cases, as in:
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.Bd -literal -offset indent
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printf(fmtcheck(user_format, standard_format), arg1, arg2);
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.Ed
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.Pp
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In the check, field widths, fillers, precisions, etc. are ignored (unless
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the field width or precision is an asterisk
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.Ql *
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instead of a digit string).
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Also, any text other than the format specifiers is completely ignored.
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.Pp
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Note that the formats may be quite different as long as they accept the
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same parameters.
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For example, "%p %o %30s %#llx %-10.*e %n" is
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compatible with "This number %lu %d%% and string %s has %qd numbers
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and %.*g floats (%n)."
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However, "%o" is not equivalent to "%lx" because
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the first requires an integer and the second requires a long.
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.Sh RETURN VALUES
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If
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.Fa fmt_suspect
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is a valid format and consumes the same argument types as
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.Fa fmt_default ,
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then the
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.Nm
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function will return
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.Fa fmt_suspect .
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Otherwise, it will return
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.Fa fmt_default .
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.Sh SEE ALSO
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.Xr printf 3
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