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.Dd June 6, 2015 .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).
p 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
p .Dl "mkstr pistrings xx *.c"
p This command causes all the error messages from the C source files in the current directory to be placed in the file
a pistrings and restructured copies of the sources to be placed in files whose names are prefixed with .Dq Li xx .
p Options: l -tag -width indent t Fl Error messages are placed at the end of the specified message file for recompiling part of a large .Nm Ns ed program. .El
p 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. d -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 The .Nm utility first appeared in x 1 . .Sh AUTHORS .An -nosplit .An Bill Joy and .An Chuck Haley , 1977. .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.