METAFONT the program by Donald E. Knuth

By Donald E. Knuth

The is the fourth quantity in a five-volume sequence on pcs and Typesetting, all authored by way of Donald E. Knuth.

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In anomalous cases, the print selector might be in an unknown state; the following subroutine is called to fix things just enough to keep running a bit longer. procedure normalize selector ; begin if log opened then selector ← term and log else selector ← term only ; if job name = 0 then open log file ; if interaction = batch mode then decr (selector ); end; 88. The following procedure prints METAFONT’s last words before dying. define succumb ≡ begin if interaction = error stop mode then interaction ← scroll mode ; { no more interaction } if log opened then error ; debug if interaction > batch mode then debug help ; gubed history ← fatal error stop ; jump out ; { irrecoverable error } end Error handling procedures 73 +≡ procedure fatal error (s : str number ); { prints s, and that’s it } begin normalize selector ; print err ("Emergency stop"); help1 (s); succumb ; end; 89.

32 PART 6: REPORTING ERRORS 77. Here now is the general error routine. )"); history ← fatal error stop ; jump out ; end; Put help message on the transcript file 86 ; exit : end; 78. Get user’s advice and return 78 ≡ loop begin continue : clear for error prompt ; prompt input ("? "); if last = first then return; c ← buffer [first ]; if c ≥ "a" then c ← c + "A" − "a"; { convert to uppercase } Interpret code c and return if done 79 ; end This code is used in section 77. 79. It is desirable to provide an ‘E’ option here that gives the user an easy way to return from METAFONT to the system editor, with the offending line ready to be edited.

The reader should study the following definitions closely: define sc ≡ int { scaled data is equivalent to integer } Types in the outer block 18 +≡ quarterword = min quarterword . max quarterword ; { 1/4 of a word } halfword = min halfword . max halfword ; { 1/2 of a word } two choices = 1 . 2; { used when there are two variants in a record } three choices = 1 . 3; { used when there are three variants in a record } two halves = packed record rh : halfword ; case two choices of 1: (lh : halfword ); 2: (b0 : quarterword ; b1 : quarterword ); end; four quarters = packed record b0 : quarterword ; b1 : quarterword ; b2 : quarterword ; b3 : quarterword ; end; memory word = record case three choices of 1: (int : integer ); 2: (hh : two halves ); 3: (qqqq : four quarters ); end; word file = file of memory word ; 157.

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