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/usr.bin/mkstr/mkstr.1

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 28.\"     @(#)mkstr.1	8.1 (Berkeley) 6/6/93
 29.\" $FreeBSD$
 30.\"
 31.Dd November 1, 2002
 32.Dt MKSTR 1
 33.Os
 34.Sh NAME
 35.Nm mkstr
 36.Nd create an error message file by massaging C source
 37.Sh SYNOPSIS
 38.Nm
 39.Op Fl
 40.Ar mesgfile
 41.Ar prefix Ar
 42.Sh DESCRIPTION
 43The
 44.Nm
 45utility creates a file containing error messages extracted from C source,
 46and restructures the same C source, to utilize the created error message
 47file.
 48The intent of
 49.Nm
 50was to reduce the size of large programs and
 51reduce swapping (see
 52.Sx BUGS
 53section below).
 54.Pp
 55The
 56.Nm
 57utility processes each of the specified files,
 58placing a restructured version of the input in a file whose name
 59consists of the specified
 60.Ar prefix
 61and the original name.
 62A typical usage of
 63.Nm
 64is
 65.Pp
 66.Dl "mkstr pistrings xx *.c"
 67.Pp
 68This command causes all the error messages from the C source
 69files in the current directory to be placed in the file
 70.Pa pistrings
 71and restructured copies of the sources to be placed in
 72files whose names are prefixed with
 73.Dq Li xx .
 74.Pp
 75Options:
 76.Bl -tag -width indent
 77.It Fl
 78Error messages are placed at the end of the specified
 79message file for recompiling part of a large
 80.Nm Ns ed
 81program.
 82.El
 83.Pp
 84The
 85.Nm
 86utility finds error messages in the source by
 87searching for the string
 88.Sq Li error("
 89in the input stream.
 90Each time it occurs, the C string starting at the
 91.Ql \&"
 92is stored
 93in the message file followed by a null character and a new-line character;
 94The new source is restructured with
 95.Xr lseek 2
 96pointers into the error message file for retrieval.
 97.Bd -literal -offset indent
 98char efilname = "/usr/lib/pi_strings";
 99int efil = -1;
100
101error(a1, a2, a3, a4)
102{
103	char buf[256];
104
105	if (efil < 0) {
106		efil = open(efilname, 0);
107		if (efil < 0)
108			err(1, "%s", efilname);
109	}
110	if (lseek(efil, (off_t)a1, SEEK_SET) < 0 ||
111	    read(efil, buf, 256) <= 0)
112		err(1, "%s", efilname);
113	printf(buf, a2, a3, a4);
114}
115.Ed
116.Sh SEE ALSO
117.Xr gencat 1 ,
118.Xr xstr 1 ,
119.Xr lseek 2
120.Sh HISTORY
121An
122.Nm
123utility appeared in
124.Bx 3.0 .
125.Sh BUGS
126The
127.Nm
128utility was intended for the limited architecture of the PDP 11 family.
129Very few programs actually use it.
130The memory savings are negligible in modern computers.