freebsd-dev/usr.bin/mkstr/mkstr.1

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.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" notice, this list of conditions and the following disclaimer in the
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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
.\" without specific prior written permission.
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" @(#)mkstr.1 8.1 (Berkeley) 6/6/93
1999-08-28 01:08:13 +00:00
.\" $FreeBSD$
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.\"
.Dd June 6, 2015
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.Dt MKSTR 1
.Os
.Sh NAME
.Nm mkstr
.Nd create an error message file by massaging C source
.Sh SYNOPSIS
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.Nm
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.Op Fl
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.Ar mesgfile
.Ar prefix Ar
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.Sh DESCRIPTION
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The
.Nm
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utility creates a file containing error messages extracted from C source,
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and restructures the same C source, to utilize the created error message
file.
The intent of
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.Nm
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was to reduce the size of large programs and
reduce swapping (see
.Sx BUGS
section below).
.Pp
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The
.Nm
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utility processes each of the specified files,
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placing a restructured version of the input in a file whose name
consists of the specified
.Ar prefix
and the original name.
A typical usage of
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.Nm
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is
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.Pp
.Dl "mkstr pistrings xx *.c"
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.Pp
This command causes all the error messages from the C source
files in the current directory to be placed in the file
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.Pa pistrings
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and restructured copies of the sources to be placed in
files whose names are prefixed with
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.Dq Li xx .
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.Pp
Options:
.Bl -tag -width indent
.It Fl
Error messages are placed at the end of the specified
message file for recompiling part of a large
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.Nm Ns ed
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program.
.El
.Pp
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The
.Nm
utility finds error messages in the source by
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searching for the string
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.Sq Li error("
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in the input stream.
Each time it occurs, the C string starting at the
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.Ql \&"
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is stored
in the message file followed by a null character and a new-line character;
The new source is restructured with
.Xr lseek 2
pointers into the error message file for retrieval.
.Bd -literal -offset indent
char efilname = "/usr/lib/pi_strings";
int efil = -1;
error(a1, a2, a3, a4)
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{
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char buf[256];
if (efil < 0) {
efil = open(efilname, 0);
if (efil < 0)
err(1, "%s", efilname);
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}
if (lseek(efil, (off_t)a1, SEEK_SET) < 0 ||
read(efil, buf, 256) <= 0)
err(1, "%s", efilname);
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printf(buf, a2, a3, a4);
}
.Ed
.Sh SEE ALSO
.Xr gencat 1 ,
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.Xr xstr 1 ,
.Xr lseek 2
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.Sh HISTORY
The
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.Nm
utility first appeared in
.Bx 1 .
.Sh AUTHORS
.An -nosplit
.An Bill Joy
and
.An Chuck Haley ,
1977.
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.Sh BUGS
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The
.Nm
utility was intended for the limited architecture of the PDP 11 family.
Very few programs actually use it.
The memory savings are negligible in modern computers.