xref: /freebsd/usr.bin/mkstr/mkstr.1 (revision 641a6cfb86023499caafe26a4d821a0b885cf00b)
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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.
131