motif can set a fixed min/max Width/Heigh on a shell widget

 The values can be set in an Xdefaults file like 

$ cat Xdefaults
memo.minWidth:  200
memo.minHeight: 300
$ xrdb -merge Xdefaults 
$ ./memo sdf
sw: 200, sh: 300 lw: 22 lh: 17
^C

 On the command line:

$ ./memo -xrm 'memo.minWidth: 50' asdf
sw: 50, sh: 65535 lw: 28 lh: 17
sw: 50, sh: 50
^C

 Hardcoded in the source file as of you set line 6 in memo.c
 to 1

$ ./memo sdf
sw: 100, sh: 50 lw: 22 lh: 17
^C

 or dynamically like one line 60

$ ./memo sdfasddaaaaddddddddddddddasssssssssss
sw: 100, sh: 50 lw: 226 lh: 17
sw: 226, sh: 50
^C