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.\"     @(#)mkstr.1	8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd November 1, 2002
.Dt MKSTR 1
.Os
.Sh NAME
.Nm mkstr
.Nd create an error message file by massaging C source
.Sh SYNOPSIS
.Nm
.Op Fl
.Ar mesgfile
.Ar prefix Ar
.Sh DESCRIPTION
The
.Nm
utility creates a file containing error messages extracted from C source,
and restructures the same C source, to utilize the created error message
file.
The intent of
.Nm
was to reduce the size of large programs and
reduce swapping (see
.Sx BUGS
section below).
.Pp
The
.Nm
utility processes each of the specified files,
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
.Nm
is
.Pp
.Dl "mkstr pistrings xx *.c"
.Pp
This command causes all the error messages from the C source
files in the current directory to be placed in the file
.Pa pistrings
and restructured copies of the sources to be placed in
files whose names are prefixed with
.Dq Li xx .
.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
.Nm Ns ed
program.
.El
.Pp
The
.Nm
utility finds error messages in the source by
searching for the string
.Sq Li error("
in the input stream.
Each time it occurs, the C string starting at the
.Ql \&"
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)
{
	char buf[256];

	if (efil < 0) {
		efil = open(efilname, 0);
		if (efil < 0)
			err(1, "%s", efilname);
	}
	if (lseek(efil, (off_t)a1, SEEK_SET) < 0 ||
	    read(efil, buf, 256) <= 0)
		err(1, "%s", efilname);
	printf(buf, a2, a3, a4);
}
.Ed
.Sh SEE ALSO
.Xr gencat 1 ,
.Xr xstr 1 ,
.Xr lseek 2
.Sh HISTORY
An
.Nm
utility appeared in
.Bx 3.0 .
.Sh BUGS
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.