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DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 1
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)



    1        	/* Dvi2ln3 translates a TeX DVI file to an LN03 format file. 
    2        	 
    3        	Dvi2ln3 is still being developed. Copyright (c) 1985 by Digital Equipment
    4        	Corporation, Maynard, Massachusetts, USA. Author: Flavio Rose,
    5        	shasta!decwrl!dec-rhea!dec-dvinci!rose. 
    6        	 
    7        	Dvi2ln3 is based on the publicly-available program DVItype, written by
    8        	David R. Fuchs of Stanford University; and also on earlier DEC programs for
    9        	the LN01 and LN03 laser printers, Dvi2lng, Topp and LN03Topp. This program
   10        	is not a DEC product and is not guaranteed to work. 
   11        	 
   12        	Dvi2ln3 is written in VAX C. Specific VAX and VMS dependencies have
   13        	generally been avoided, however. The reader may find them by searching
   14        	for the strings VAX and VMS in this file.
   15        	 
   16        	During development, double square brackets [[ ]] in a comment indicate some
   17        	places where the code needs to be improved. 
   18        	 
   19        	[[Among the useful things that still need to be done: differentiating
   20        	between int and long variables so this can be ported more easily to 16-bit
   21        	architectures; testing to see if malloc returns 0; a \special for ROM
   22        	fonts; a \special for sixels.]] 
   23        	 
   24        	Development history:
   25        	 
   26        	Feb. 85:  Did some early work on Dvi2ln3, translating bits and pieces
   27        	    	  of Dvi2lng. Concluded, however, that it was better to translate
   28        	    	  LN03Topp and Dvi2lng into C first. The reason for this is that code 
   29        	    	  which mimics an existing program is easier to write and to test. 
   30        	 
   31        	5/15/85:  At this date, the old LN03Topp program has been successfully
   32        	    	  translated into C (except for the ability to read files over
   33        	    	  DECnet). At this point, did some further cleanup of the Dvi2ln3 
   34        	    	  source. 
   35        	 
   36        	 6/4/85:  Coding of Dvi2ln3 begins in earnest. Merging bits and
   37        	    	  pieces from various places. Chucking chunks and all that
   38        	    	  junk from LN03Topp; pass2 is just straightforward translation.
   39        	 
   40        	6/22/85:  Cleanup after initial debugging. Ready to distribute.
   41        	 
   42        	10/14/85: Bug in parsing of \special's. Version 1.
   43        	 
   44        	*/ 
   45        	 
   46        	#include stdio
  104        	 
  105        	/* To please the VMS linker, we declare all global variables to be
  106        	globaldef. This is done with #define's, so it may easily be undone when

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 2
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  107        	porting the program to other systems. */ 
  108        	 
  109        	#ifdef vms
  110        	#define GLOBAL globaldef
  111        	#define EXTERN globalref
  112        	#else
  113   X    	#define GLOBAL 
  114   X    	#define EXTERN extern
  115        	#endif
  116        	 
  117        	/* hoff is the horizontal offset in pixels to be added to all dimensions
  118        	read in; voff is the corresponding vertical offset. */
  119        	 
  120        	GLOBAL int hoff, voff, startp;
  121        	GLOBAL FILE *dvifile,*tfmfile,*outfile;
  122        	 
  123        	/* Each page in a DVI file is identified by ten longwords, which appear
  124        	immediately after each bop (beginning of page) command. Dvi2ln3, like
  125        	DVItype, supports certain options that allow one to print only selected
  126        	pages. The following variables are used for this purpose. 
  127        	 
  128        	Num_pages is a count of how many pages have been passed to the output.
  129        	Max_pages is the user-specified maximum number of pages to pass.
  130        	How_many_counts denotes the number of identifying longwords to take into
  131        	account when searching for the user-specified starting page. The user
  132        	specifies the starting page as the first one whose identifying longwords
  133        	match certain specified values, stored in start_page. However, identifying
  134        	longword i is only required to match the value in start_page[i] if
  135        	use_count[i] is nonzero. */ 
  136        	 
  137        	GLOBAL long int num_pages,max_pages;
  138        	GLOBAL int how_many_counts,use_count[10];
  139        	GLOBAL long int start_page[10];
  140        	 
  141        	/* FILESPECLEN is the maximum size of a file specification under VMS.
  142        	[[Perhaps arrays of fixed size should not be used, but rather malloc should
  143        	be employed...]] */ 
  144        	 
  145        	#define FILESPECLEN 252
  146        	 
  147        	/* The main routine deals with the command line arguments, opens the dvi
  148        	file, and then calls various other routines to handle the "passes". There
  149        	are two passes which involve reading the DVI file; in between, the font
  150        	load is constructed. */ 
  151        	 
  152        	main(argc,argv) 
  153        	int argc;
  154        	char *argv[];
  155        	{
  156    1   	    int status,i,jnam,jext;
  157    1   	    char infnam[FILESPECLEN];

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 3
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  158    1   	 
  159    1   	    if (argc &lt; 2) { printf("\n Usage: Dvi2ln3 &lt;filename&gt; &lt;options&gt;");
  160    2   	    	goto exit_label; }
  161    1   	 
  162    1   	    printf("\n Dvi2ln3 1");
  163    1   	 
  164    1   	    strcpy(infnam,argv[1]);
  165    1   	 
  166    1   	/* The extension of the input file defaults to .dvi. Locate the filename
  167    1   	field within the filespec parameter, set jname to point to beginning, jext
  168    1   	to point to one place after end. [[This code is of course dependent on the
  169    1   	VMS filespec syntax.]] */ 
  170    1   	 
  171    1   	    find_VMS_filename(infnam,&amp;jnam,&amp;jext);
  172    1   	    if (infnam[jext] == '\0') strcat(infnam,".dvi");
  173    1   	    dvifile = fopen(infnam,"r");
  174    1   	    if (dvifile == NULL) { printf("\n Couldn't open dvi file");
  175    2   	    	goto exit_label; }
  176    1   	 
  177    1   	/* Now decipher the options off the command line. */
  178    1   	 
  179    1   	    max_pages = 1000000000;
  180    1   	    how_many_counts = 0;
  181    1   	    hoff = 300;
  182    1   	    voff = 300;
  183    1   	    for (i=2; i&lt;argc; i++) command_line_options(argv[i]);
  184    1   	 
  185    1   	    status = pass1();
  186    1   	    if (status != 0) goto exit_label; 
  187    1   	    if (rewind(dvifile) == -1) {
  188    2   	    	printf("\n Couldn't rewind dvi file.");
  189    2   	    	goto exit_label;
  190    2   	    }
  191    1   	 
  192    1   	    status = open_output_file(infnam,jnam,jext,".ln3");
  193    1   	    if (status != 0) { printf("\n Couldn't open output file");
  194    2   	    	goto exit_label; }
  195    1   	 
  196    1   	    status = make_font_load();
  197    1   	    if (status != 0) goto exit_label;
  198    1   	 
  199    1   	    pass2();
  200    1   	 
  201    1   	    fprintf(outfile,"\033c");
  202    1   	    fclose(dvifile);
  203    1   	    fclose(outfile);
  204    1   	 
  205    1   	exit_label:
  206    1   	    ;
  207    1   	}
  208        	 

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 4
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  209        	/* Find_VMS_filename finds the filename part of a VMS filespec passed in s,
  210        	returning the index of the first character in *ns, and the index of the
  211        	character after the last in *ne. 
  212        	 
  213        	[[When porting Dvi2ln3 to a non-VMS system, we need to find an alternative
  214        	to this function. Under Unix, as a first approximation, we could look for
  215        	the last "/" or "~" and then for the first succeeding "." in the filespec.
  216        	Is this correct?]] */ 
  217        	 
  218        	int find_VMS_filename(s,ns,ne)
  219        	char s[];
  220        	int *ns,*ne;
  221        	{
  222    1   	    int jnam,jext,j,slen;
  223    1   	 
  224    1   	    slen = strlen(s);
  225    1   	    jnam = 0;
  226    1   	    for (j = slen-1; j &gt;= 0; j--) {
  227    2   	    	if (s[j] == ':' || s[j] == ']' ||
  228    2   	    	    s[j] == '&gt;') {
  229    3   	    	    jnam = j+1;
  230    3   	    	    break;
  231    3   	    	}
  232    2   	    }
  233    1   	 
  234    1   	    jext = slen;	
  235    1   	    for (j = jnam; j &lt; slen; j++) {
  236    2   	    	if (s[j] == '.' || s[j] == ';') {
  237    3   	    	    jext = j;
  238    3   	    	    break;
  239    3   	    	}
  240    2   	    }
  241    1   	 
  242    1   	    *ns = jnam;
  243    1   	    *ne = jext;
  244    1   	}
  245        	 
  246        	/* ERROR HANDLING: Errors should be reported as close to the source as
  247        	possible, so that the maximum amount of information is available to the
  248        	user to identify the error. 
  249        	 
  250        	Errors in the format of DVI or TFM files are not reported specifically,
  251        	since there exist programs, DVItype and TFtoPL, which diagnose errors in
  252        	such files. This program accepts some incorrect DVI files, for example,
  253        	those with a bad postamble or bad backpointers. [[However, someday we may
  254        	rewrite the program to select pages by using these features of the DVI
  255        	format, rather than by skipping unwanted pages.]] */ 
  256        	 
  257        	GLOBAL char *bad_DVI_message = "\nBad DVI file - check it with DVItype";
  258        	 
  259        	/* Command_line_options reads and processes options off the string s. At

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 5
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  260        	this time, four options are supported. 
  261        	 
  262        	The N option sets the maximum number of pages to be printed. Its syntax is
  263        	/N=&lt;integer&gt; . 
  264        	 
  265        	The H option modifies the default horizontal offset.
  266        	 
  267        	The V option modifies the default vertical offset. 
  268        	 
  269        	The S option has syntax /S=&lt;pagespec&gt;{.&lt;pagespec&gt;}* where the {}* denotes
  270        	repetition, and a &lt;pagespec&gt; is either an integer or * to indicate any
  271        	value. An example would be "/S=*.8.3". 
  272        	 
  273        	The meaning of the S option is as follows: In a DVI file, pages are
  274        	identified by ten longword values which follow each bop (beginning of page)
  275        	command. The value of the S option indicates which page to start printing
  276        	on. For example, "*.8.3" means start printing at the first page whose
  277        	second identifying longword is 8 and third is 3. */
  278        	 
  279        	int command_line_options(t)
  280        	char *t;
  281        	{
  282    1   	    long int i,k;
  283    1   	    char *u;
  284    1   	 
  285    1   	    while ((t = strchr(t,'/')) != 0) {
  286    2   		t++;
  287    2   	    	if (toupper(t[0]) == 'N' &amp;&amp; t[1] == '=' 
  288    2   		    	&amp;&amp; (sscanf(&amp;t[2],"%ld",&amp;k) == 1)) 
  289    2   		    max_pages = k;
  290    2   	    	if (toupper(t[0]) == 'H' &amp;&amp; t[1] == '=' 
  291    2   		    	&amp;&amp; (sscanf(&amp;t[2],"%ld",&amp;k) == 1)) 
  292    2   		    hoff = k;
  293    2   	    	if (toupper(t[0]) == 'V' &amp;&amp; t[1] == '=' 
  294    2   		    	&amp;&amp; (sscanf(&amp;t[2],"%ld",&amp;k) == 1)) 
  295    2   		    voff = k;
  296    2   	    	else if (toupper(t[0]) == 'S' &amp;&amp; t[1] == '=') {
  297    3   		    t += 2;
  298    3   		    how_many_counts = 0;
  299    3   		    for (;;) {
  300    4   		    	if (t[0] == '*') {
  301    5   			    use_count[how_many_counts] = 0;
  302    5   			    how_many_counts++;
  303    5   			}
  304    4   			else if (sscanf(t,"%ld",&amp;k) != 0) {
  305    5   			    use_count[how_many_counts] = 1;
  306    5   			    start_page[how_many_counts] = k;
  307    5   			    how_many_counts++;
  308    5   			} else break;
  309    4   		    	u = strchr(t,'.');
  310    4   		    	if (u == 0) break;

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 6
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  311    4   	    		t = &amp;u[1];
  312    4   		    }
  313    3   		}
  314    2   	    } 
  315    1   	}
  316        	 
  317        	/* Open_output_file opens one of the output files, using the file pointer
  318        	outfile. The name of the output file is obtained by appending the string
  319        	ext to the substring of infnam beginning at jnam and ending at jext. 
  320        	 
  321        	[[This code contains a VMS depndency. We use creat followed by fdopen to
  322        	open the file as a normal VMS file ("rat=cr","rfm=var") rather than a
  323        	STREAM_LF file. Beginning with VAX C V2.0, this can be done by just calling
  324        	fopen.]] */ 
  325        	 
  326        	int open_output_file(infnam,jnam,jext,ext)
  327        	char *infnam,*ext;
  328        	int jnam,jext;
  329        	{
  330    1   	    char outfnam[FILESPECLEN];
  331    1   	    int jj;
  332    1   	 
  333    1   	    strcpy(outfnam,&amp;infnam[jnam]);
  334    1   	    strcpy(&amp;outfnam[jext-jnam],ext);
  335    1   	 
  336    1   	    jj = creat(outfnam,0,"rat=cr","rfm=var");
  337    1   	    if (jj == -1) return(1);
  338    1   	    outfile = fdopen(jj,"w");
  339    1   	    if (outfile == NULL) return(1);
  340    1   	 
  341    1   	    return(0);
  342    1   	}
  343        	 
  344        	/* Bytes are read one by one from the DVI file using getc. We use an
  345        	overlay, as suggested in the DVItype documentation, to combine these bytes
  346        	into larger integers. [[Note that this technique relies on the fact that
  347        	numbers on the VAX are stored with the least significant byte first. The
  348        	macros below would have to be changed if the program were to be ported to a
  349        	machine architecture for which this is not so.]] 
  350        	 
  351        	[[The use of getc is expensive, since getc is a function in VAX C V2.0.
  352        	Eventually, one would want to rewrite these macros to work like the old
  353        	getc macro.]] */ 
  354        	 
  355        	GLOBAL union lc { long int l; unsigned long int ul; char c[4]; 
  356        		    unsigned char uc[4]; } lcx;
  357        	 
  358        	#define two_bytes_u lcx.uc[1] = getc(dvifile); \
  359        	    lcx.uc[0] = getc(dvifile); lcx.uc[2] = 0; lcx.uc[3] = 0
  360        	 
  361        	#define two_bytes_s lcx.c[1] = getc(dvifile); \

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 7
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  362        	    lcx.c[0] = getc(dvifile);  \
  363        	    if (lcx.c[1] &gt;= 0) { lcx.uc[2] = 0; lcx.uc[3] = 0 ;} \
  364        	    else { lcx.uc[2] = 255; lcx.uc[3] = 255; }
  365        	 
  366        	#define three_bytes_u lcx.uc[3] = getc(dvifile); lcx.uc[1] = getc(dvifile); \
  367        	    lcx.uc[0] = getc(dvifile); lcx.uc[2] = 0
  368        	 
  369        	#define three_bytes_s lcx.c[2] = getc(dvifile); lcx.c[1] = getc(dvifile); \
  370        	    lcx.c[0] = getc(dvifile);  \
  371        	    lcx.uc[3] = (lcx.c[2] &gt;= 0) ? 0 : 255;
  372        	 
  373        	#define four_bytes lcx.c[3] = getc(dvifile); \
  374        	    lcx.c[2] = getc(dvifile); lcx.c[1] = getc(dvifile); \
  375        	    lcx.c[0] = getc(dvifile); 
  376        	 
  377        	/* Knuth's programs like to hardcode fixed maximum sizes for various
  378        	things, for example, the maximum number of fonts allowed in a DVI file. In
  379        	general, it is preferable to use the C function malloc to allocate storage
  380        	as needed. That is what we generally do in this Dvi2ln3, but there are some
  381        	residues of the Knuthian approach, like MAXTEXFONTS below. By the way, we
  382        	never attempt to return any storage to the system. 
  383        	 
  384        	[[Eventually, it would be better to get rid of MAXTEXFONTS and use a linked
  385        	list of records instead. There would be no cpu time penalty to using a
  386        	linked list, because the function set_curf below does a linear search
  387        	through the font array anyway.]] */
  388        	 
  389        	#define MAXTEXFONTS 100
  390        	 
  391        	struct txf { unsigned char chu[256]; int bc, ec; long int space, design_size,
  392        	    scaled_size; int nchs; };
  393        	 
  394        	GLOBAL struct txf *txfa[MAXTEXFONTS+1];
  395        	 
  396        	/* Font width information needs to be read from TFM files. TFM is a special
  397        	format defined by TeX. Dvi2ln3 stores each width in a longword. DVItype
  398        	tries to save space by a two-level width storage method. We just allocate
  399        	an array of widths for each font with malloc. 
  400        	 
  401        	[[We don't check that font checksums match in Dvi2ln3, because there are a
  402        	lot of slightly obsolete TFMs floating around which would result in a
  403        	checksum error, but seem to give perfectly reasonable formatted output
  404        	nonetheless.]] */ 
  405        	 
  406        	GLOBAL long int *font_width[MAXTEXFONTS+1];
  407        	 
  408        	/* TeX fonts are referred to by their internal numbers, which go from 0 to
  409        	nf-1. The DVI file refers to them by external numbers, hence the array
  410        	to_ext used to convert internal numbers to external numbers. Curf is the
  411        	internal font number of the current font in the DVI file. */ 
  412        	 

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 8
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  413        	GLOBAL int to_ext[MAXTEXFONTS+1],
  414        	    nf,
  415        	    curf;
  416        	 
  417        	/* In some switch statements, a lot of cases have to be enumerated. We
  418        	employ this Knuthian macro for that purpose: */ 
  419        	 
  420        	#define four_cases(_x1) case _x1: case _x1+1: case _x1+2: case _x1+3: 
  421        	 
  422        	/* We define a lot of constants corresponding to the DVI operation codes.
  423        	These are copied from DVItype. */ 
  424        	 
  425        	#define id_byte 2    /* current version of the dvi format */
  426        	#define set_char_0 0 /* typeset character 0 and move right */
  427        	#define set1 128     /* typeset a character and move right */
  428        	#define set_rule 132 /* typeset a rule and move right */
  429        	#define put1 133     /* typeset a character */
  430        	#define put_rule 137 /* typeset a rule */
  431        	#define nop 138      /* no operation */
  432        	#define bop 139      /* beginning of page */
  433        	#define eop 140      /* ending of page */
  434        	#define push 141     /* save the current positions */
  435        	#define pop 142      /* restore previous positions */
  436        	#define right1 143   /* move right */
  437        	#define w0 147       /* move right by |w| */
  438        	#define w1 148       /* move right and set |w| */
  439        	#define x0 152       /* move right by |x| */
  440        	#define x1 153       /* move right and set |x| */
  441        	#define down1 157    /* move down */
  442        	#define y0 161       /* move down by |y| */
  443        	#define y1 162       /* move down and set |y| */
  444        	#define z0 166       /* move down by |z| */
  445        	#define z1 167       /* move down and set |z| */
  446        	#define fnt_num_0 171 /* set current font to 0 */
  447        	#define fnt1 235     /* set current font */
  448        	#define xxx1 239     /* extension to dvi primitives (\special) */
  449        	#define xxx4 242     /* potentially long extension to dvi primitives */
  450        	#define fnt_def1 243 /* define the meaning of a font number */
  451        	#define pre 247      /* preamble */
  452        	#define post 248     /* postamble beginning */
  453        	#define post_post 249 /* postamble ending */
  454        	#define undefined_command 250
  455        	 
  456        	GLOBAL long int mag, num, den;
  457        	GLOBAL float conv, unmag_conv;
  458        	 
  459        	/* Read_preamble reads the preamble of the dvi file. The comment is thrown
  460        	away. The format version number is checked. The magnification, numerator,
  461        	and denominator are remembered in the globals mag, num, den. The float
  462        	values conv and unmag_conv serve to convert measurements from DVI units to
  463        	pixels. */ 

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 9
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  464        	 
  465        	int read_preamble() {
  466    1   	    unsigned int i;
  467    1   	    int j;
  468    1   	 
  469    1   	    i = getc(dvifile);
  470    1   	    if (i != pre) return(1);
  471    1   	    i = getc(dvifile);
  472    1   	    if (i != id_byte) return(1);
  473    1   	    four_bytes; num = lcx.l;
  474    1   	    if (num &lt;= 0) return(1);
  475    1   	    four_bytes; den = lcx.l;
  476    1   	    if (den &lt;= 0) return(1);
  477    1   	    four_bytes; mag = lcx.l;
  478    1   	    if (mag &lt;= 0) return(1);
  479    1   	 
  480    1   	    unmag_conv = (num/254000.0) * (300.0/den);
  481    1   	    conv = unmag_conv * (mag/1000.0);
  482    1   	 
  483    1   	/* Skip over the comment field. */
  484    1   	    
  485    1   	    i = getc(dvifile);
  486    1   	    for (j=0; j&lt;i; j++) getc(dvifile);
  487    1   	    return(0);
  488    1   	}
  489        	 
  490        	/* The dvi file format requires us to keep track of various quantities,
  491        	among them the horizontal and vertical positions h and v, and four values
  492        	referred to simply as x, y, z and w. We also keep pixel-rounded versions
  493        	of h and v, called hh and vv. */ 
  494        	 
  495        	GLOBAL long h, v, x, y, z, w;
  496        	GLOBAL int hh, vv;
  497        	 
  498        	/* The following function, copied from DVItype, reads from the DVI file the
  499        	first parameter of the current DVI command. In the case of functions whose
  500        	first parameter is implicit, such as set_char_0 through set_char_127, the
  501        	implicit parameter is returned. */ 
  502        	 
  503        	long first_par(o)
  504        	int o;
  505        	{
  506    1   	    unsigned int i;
  507    1   	 
  508    1   	    if ((o &gt;= set_char_0) &amp;&amp; (o &lt; set_char_0+128))
  509    1   		return(o-set_char_0);
  510    1   	    if ((o &gt;= fnt_num_0) &amp;&amp; (o &lt; fnt_num_0+64))
  511    1   	    	return(o-fnt_num_0);
  512    1   	    switch (o) {
  513    2   	    	case set1:
  514    2   	    	case put1:

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 10
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  515    2   	    	case fnt1:
  516    2   	    	case xxx1:
  517    2   	    	case fnt_def1:
  518    2   	    	    i = getc(dvifile);
  519    2   		    return(i);
  520    2   	    	case set1+1:
  521    2   	    	case put1+1:
  522    2   	    	case fnt1+1:
  523    2   	    	case xxx1+1:
  524    2   	    	case fnt_def1+1:
  525    2   	    	    two_bytes_u;
  526    2   		    return(lcx.ul);
  527    2   	    	case set1+2:
  528    2   	    	case put1+2:
  529    2   	    	case fnt1+2:
  530    2   	    	case xxx1+2:
  531    2   	    	case fnt_def1+2:
  532    2   	    	    three_bytes_u;
  533    2   		    return(lcx.ul);
  534    2   	    	case right1:
  535    2   	    	case w1:
  536    2   	    	case x1:
  537    2   	    	case down1:
  538    2   	    	case y1:
  539    2   	    	case z1:
  540    2   		    return(getc(dvifile));
  541    2   	    	case right1+1:
  542    2   	    	case w1+1:
  543    2   	    	case x1+1:
  544    2   	    	case down1+1:
  545    2   	    	case y1+1:
  546    2   	    	case z1+1:
  547    2   	    	    two_bytes_s;
  548    2   		    return(lcx.l);
  549    2   	    	case right1+2:
  550    2   	    	case w1+2:
  551    2   	    	case x1+2:
  552    2   	    	case down1+2:
  553    2   	    	case y1+2:
  554    2   	    	case z1+2:
  555    2   	    	    three_bytes_s;
  556    2   		    return(lcx.l);
  557    2   	    	case set_rule:
  558    2   	    	case put_rule:
  559    2   	    	case right1+3:
  560    2   	    	case w1+3:
  561    2   	    	case x1+3:
  562    2   	    	case down1+3:
  563    2   	    	case y1+3:
  564    2   	    	case z1+3:
  565    2   	    	case set1+3:

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 11
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  566    2   	    	case put1+3:
  567    2   	    	case fnt1+3:
  568    2   	    	case xxx1+3:
  569    2   	    	case fnt_def1+3:
  570    2   	    	    four_bytes;
  571    2   	    	    return(lcx.l);
  572    2   		case w0:
  573    2   		    return(w);
  574    2   		case x0:
  575    2   		    return(x);
  576    2   		case y0:
  577    2   		    return(y);
  578    2   		case z0:
  579    2   		    return(z);
  580    2   		default:
  581    2   		    return(0);
  582    2   	    }
  583    1   	}
  584        	 
  585        	/* Pass1 reads from the DVI file until the starting page condition is met.
  586        	Return 1 if something goes wrong, or if the DVI file comes to an end. This
  587        	resembles skip_pages below. */ 
  588        	 
  589        	int pass1() {
  590    1   	 
  591    1   	    unsigned int k;
  592    1   	    long int p;
  593    1   	    int i;
  594    1   	    char startp;
  595    1   	    
  596    1   	    if (read_preamble() != 0) {
  597    2   	    	printf(bad_DVI_message);
  598    2   	    	return(1);
  599    2   	    }
  600    1   	 
  601    1   	    for (;;) {
  602    2   		if (feof(dvifile)) {
  603    3   		    printf(bad_DVI_message);
  604    3   		    return(1);
  605    3   		}
  606    2   		k = getc(dvifile);
  607    2   		if (k == post) return(0);
  608    2   		p = first_par(k);
  609    2   		if (k &gt;= set_char_0 &amp;&amp; k &lt; set_char_0+128) k = set1;
  610    2   		if (k &gt;= fnt_num_0 &amp;&amp; k &lt; fnt_num_0+64) k = fnt1;
  611    2   	 
  612    2   		switch (k) {
  613    3   		    case bop:
  614    3   			startp = 1;
  615    3   			for (i=0; i&lt;10; i++) {
  616    4   			    four_bytes;

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 12
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  617    4   			    if (i &lt; how_many_counts &amp;&amp; use_count[i] &amp;&amp;
  618    4   				    lcx.l != start_page[i]) startp = 0;
  619    4   			    }
  620    3   	    		four_bytes;
  621    3   			if (startp != 0) num_pages = 1;
  622    3   	    		else if (num_pages &gt; 0) {
  623    4   			    num_pages++;
  624    4   			    if (num_pages &gt; max_pages) return(0);
  625    4   			}
  626    3   	    		break;
  627    3   	    	    case set_rule:
  628    3   	    	    case put_rule:
  629    3   	    		four_bytes;
  630    3   		        break;
  631    3   		    four_cases(fnt_def1)
  632    3   		    	i = define_font(p);
  633    3   		    	if (i != 0) return(1);
  634    3   		    	break;
  635    3   		    four_cases(fnt1)
  636    3   			if (num_pages &gt; 0) set_curf(p);
  637    3   			break;
  638    3   	            four_cases(set1)
  639    3   		    four_cases(put1)
  640    3   		    	if (num_pages &gt; 0)
  641    3   			    txfa[curf] -&gt; chu[p] = 1;
  642    3   			break;
  643    3   		    four_cases(xxx1)
  644    3   		    	for (; p&gt;0; p--) getc(dvifile);
  645    3   			break;
  646    3   	            default:
  647    3   	    		break;
  648    3   		}
  649    2   	    }
  650    1   	    return(0);
  651    1   	}
  652        	 
  653        	#define leftfirst 33
  654        	#define rightfirst 161
  655        	#define leftlast 126
  656        	#define rightlast 254
  657        	 
  658        	/* The define of maxnfonts below is based on a belief, perhaps
  659        	superstitious, that there is a limit of 31 downline-loaded fonts in the
  660        	LN03. For us an nfont is two LN03 fonts, hence the following definition. */
  661        	 
  662        	#define maxnfonts 16
  663        	 
  664        	/* Txf is a record structure describing a TeX font. Txfa is an array of txf
  665        	records. Txf2lnf describes the mapping between TeX fonts and pairs of LN03
  666        	fonts. Because the constructed LN03 font load has just the glyphs that are
  667        	needed, we can often cram more than one TeX font into a pair of LN03 fonts.

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 13
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  668        	 
  669        	Why a pair of fonts? Because LN03 fonts are allowed to hold 94 glyphs only.
  670        	They come in two flavors, "left" which answer to character codes 33 to 126,
  671        	and "right" which answer to codes 161 to 254. LN03Topp assigns each TeX
  672        	font to one "lnfno", where each lnfno denotes a pair of LN03 fonts, one
  673        	left, one right. */ 
  674        	 
  675        	GLOBAL int txf2lnf[MAXTEXFONTS];
  676        	 
  677        	/* Maxfontnos reflects the fact that all LN03 fonts must be denoted by
  678        	a number from 10 to 19. */
  679        	 
  680        	#define maxfontnos 9
  681        	 
  682        	GLOBAL int lastch[maxnfonts];
  683        	GLOBAL unsigned char chw[maxnfonts][256];
  684        	GLOBAL char fname[maxnfonts][32];
  685        	 
  686        	/* The LN03 font-denoting numbers 10-19 have to be allocated among the
  687        	fonts. The useno array keeps track of which number a font is allowed to
  688        	use, -1 if none is currently allocated. The whouses array says which font
  689        	is using a number. */ 
  690        	 
  691        	GLOBAL int useno[maxnfonts],whouses[maxfontnos];
  692        	 
  693        	/* Font_name points to strings containing font names, which are created
  694        	with malloc as needed. */ 
  695        	 
  696        	GLOBAL char *font_name[MAXTEXFONTS+1]; 
  697        	 
  698        	GLOBAL int maxrmar,maxbmar;
  699        	 
  700        	#define max(x,y) (((x)&gt;(y))?(x):(y))
  701        	#define min(x,y) (((x)&lt;(y))?(x):(y))
  702        	 
  703        	/* Make_font_load calls on other procedures to generate the LN03 font load.
  704        	*/ 
  705        	 
  706        	int make_font_load() {
  707    1   	    
  708    1   	    int i,j,jj,k,l,fno,maxfno,chsize;
  709    1   	    long int totsize;
  710    1   	    int lnfcnt,txfcnt,the_txf,txf_size,lnfleft;
  711    1   	    int txford[MAXTEXFONTS];
  712    1   	    char cnt[3];
  713    1   	 
  714    1   	    totsize = 0;
  715    1   	    chsize = 0;
  716    1   	    curf = 0;
  717    1   	    for (i=0; i&lt;maxnfonts; i++) 
  718    1   	    	for (j=0; j&lt;256; j++) chw[i][j] = 0;

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 14
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  719    1   	 
  720    1   	    for (jj=0; jj&lt;MAXTEXFONTS; jj++) txf2lnf[jj] = -1;
  721    1   	 
  722    1   	/* Fill the fname strings with different valid LN03 font names. */ 
  723    1   	 
  724    1   	    for (i=0; i&lt;maxnfonts; i++) 
  725    1   	        strcpy(fname[i],"U000000002SK00GG0001UZZZZ02F000");
  726    1   	    for (jj=1; jj&lt;maxnfonts; jj++) {
  727    2   	    	sprintf(cnt,"%02d",jj);
  728    2   	    	strncpy(&amp;(fname[jj][5]),cnt,2);
  729    2   	    }
  730    1   	 
  731    1   	/* The margins are set to values appropriate for American 8 1/2 by 11
  732    1   	paper. It is not clear if this needs to be changed for European A4 paper.
  733    1   	Not changing it might deprive Europeans of access to the bottom 1.5cm of
  734    1   	their paper. */ 
  735    1   	 
  736    1   	    maxrmar = 2550;
  737    1   	    maxbmar = 3300;
  738    1   	 
  739    1   	/* In the following, esc[?27h means "advance the carriage by the character
  740    1   	width when you set a character", esc[11h and esc[7 I together mean to
  741    1   	interpret all dimensions in escape sequences as pixel units; esc[?52h means
  742    1   	our origin of coordinates is the upper left edge of the paper; esc[%dt
  743    1   	means the "maximum length" of the paper is maxbmar pixels. */ 
  744    1   	 
  745    1   	    fprintf(outfile,"\033c\033[?27h\033[11h\033[7 I\033[?52h\033[%dt\n",
  746    1   	    	maxbmar);
  747    1   	 
  748    1   	    for (i=0; i&lt;maxnfonts; i++) useno[i] = -1;
  749    1   	    for (i=0; i&lt;maxfontnos; i++) whouses[i] = -1;
  750    1   	    maxfno = -1;
  751    1   	 
  752    1   	/* Write font loading escape sequence onto outf. [[It may be desirable to
  753    1   	make this escape sequence clear all dowloaded fonts from RAM.]] */ 
  754    1   	 
  755    1   	    fprintf(outfile,"\033P0;1;1y");
  756    1   	 
  757    1   	/* Count how many glyphs each font requires. */
  758    1   	 
  759    1   	    for (fno=0; fno&lt;nf; fno++) {
  760    2   	 
  761    2   	    	txfa[fno] -&gt; nchs = 0;
  762    2   	    	for(i=0; i&lt;256; i++) 
  763    2   		    if (txfa[fno] -&gt; chu[i] != 0) txfa[fno] -&gt; nchs++;
  764    2   	 
  765    2   		if (txfa[fno] -&gt; nchs &gt; 188)  goto need_empty_slots;
  766    2   		chsize += txfa[fno] -&gt; nchs;
  767    2   	    }
  768    1   	    printf("\nFont load to contain %d glyphs.",chsize);
  769    1   	 

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 15
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  770    1   	 
  771    1   	/* Now we have to allocate TeX fonts to LN03 fonts pairs and perform the
  772    1   	actual load. The goal is to use as few slots as possible, where an LN03
  773    1   	font pair with &lt;= 94 glyphs is one slot, and a font pair with &gt; 94 but &lt;=
  774    1   	188 glyphs is two slots. 
  775    1   	 
  776    1   	As in the LN01 case, the allocation problem seems to be some sort of hard
  777    1   	bin packing problem. (Proof of NP-hardness, anyone?) So we use a best fit
  778    1   	heuristic: 
  779    1   	 
  780    1   	1. 	Find the unassigned largest TeX font. If none, exit, we're done.
  781    1   	 
  782    1   	2.	Allocate an LN03 font pair for that TeX font and put the TeX
  783    1   	    	font into it.
  784    1   	 
  785    1   	3.	Find the largest remaining TeX font that fits in what is left of 
  786    1   	    	that LN03 font pair.
  787    1   	 
  788    1   	    3.1. if none exists, go to 1.
  789    1   	    3.2. if one exists, put it in the font pair and go back to 3.
  790    1   	 
  791    1   	The txford array contains the TeX font numbers in the order that they are
  792    1   	assigned. Txfcnt keeps track of how many TeX fonts have been assigned so
  793    1   	far. */ 
  794    1   	 
  795    1   	    lnfcnt = 0;
  796    1   	    txfcnt = 0;
  797    1   	    for (i=0; i&lt;MAXTEXFONTS; i++) txford[i] = -1;
  798    1   	 
  799    1   	    while (1) {
  800    2   	 
  801    2   	/* Find largest unassigned TeX font */
  802    2   	 
  803    2   		lnfleft = rightlast-rightfirst+1+leftlast-leftfirst+1;
  804    2   		txf_size = -1;
  805    2   		for (j = 0; j &lt; MAXTEXFONTS; j++) {
  806    3   		    if (txfa[j] != 0 &amp;&amp; txf2lnf[j] == -1 
  807    3   			&amp;&amp; txfa[j] -&gt; nchs &gt; txf_size) {
  808    4   			txf_size = txfa[j] -&gt; nchs;
  809    4   			the_txf = j;
  810    4   		    }
  811    3   		}
  812    2   		if (txf_size &lt;= 0)  goto assignment_done;
  813    2   		if (lnfcnt &gt; maxnfonts)  goto too_complex;
  814    2   		if (txf_size &gt; lnfleft)  goto need_empty_slots;
  815    2   	 
  816    2   	/* Now allocate new LN03 font pair and put the current TeX font into it */ 
  817    2   	 
  818    2   		txf2lnf[the_txf] = lnfcnt;
  819    2   		txford[txfcnt] = the_txf;
  820    2   		txfcnt++;

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 16
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  821    2   		k = leftfirst-1;
  822    2   		for (j = 0; j &lt;= 255; j++) {
  823    3   		    if (txfa[the_txf] -&gt; chu[j] != 0) {
  824    4   			k++;
  825    4   			if (k == leftlast+1)  k = rightfirst;
  826    4   			lnfleft--;
  827    4   			txfa[the_txf] -&gt; chu[j] = k; 
  828    4   		    }
  829    3   		}
  830    2   		lastch[lnfcnt] = k;
  831    2   	 
  832    2   	/* Now try to fill the remaining part of the LN03 font pair using other TeX
  833    2   	fonts */ 
  834    2   	 
  835    2   		while (1) {
  836    3   	 
  837    3   		    txf_size = -1;
  838    3   		    for (j = 0; j &lt; MAXTEXFONTS; j++) {
  839    4   			if (txfa[j] != 0 &amp;&amp; txf2lnf[j] == -1
  840    4   			    &amp;&amp; txfa[j] -&gt; nchs &gt; txf_size 
  841    4   			    &amp;&amp; txfa[j] -&gt; nchs &lt;= lnfleft) {
  842    5   			    txf_size = txfa[j] -&gt; nchs;
  843    5   			    the_txf = j;
  844    5   			}	
  845    4   		    }
  846    3   		    if (txf_size &lt;= 0)  break;
  847    3   		    	
  848    3   		    txf2lnf[the_txf] = lnfcnt;
  849    3   		    txford[txfcnt] = the_txf;
  850    3   		    txfcnt++;
  851    3   		    k = lastch[lnfcnt];
  852    3   		    for (j=0; j&lt;=255; j++) {
  853    4   			if (txfa[the_txf] -&gt; chu[j] != 0) {
  854    5   			    k++;
  855    5   			    lnfleft--;
  856    5   			    if (k == leftlast+1) k = rightfirst;
  857    5   			    txfa[the_txf] -&gt; chu[j] = k; 
  858    5   			}
  859    4   		    }
  860    3   		    lastch[lnfcnt] = k;
  861    3   		}
  862    2   		
  863    2   		lnfcnt++;
  864    2   	    }
  865    1   	 
  866    1   	assignment_done:
  867    1   	 
  868    1   	/* At this point the array txf2lnf is properly initialized, as are lastch
  869    1   	and txford. It remains to actually generate the desired font load. This has
  870    1   	to be done carefully, since the function add_txf_to_lnf only supports
  871    1   	adding glyphs to an LN03 font pair in ascending order of character code. */

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 17
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  872    1   	 
  873    1   	    for (j=0; j&lt;txfcnt; j++) {
  874    2   		k = txford[j];
  875    2   		if (j != 0 &amp;&amp; txf2lnf[k] != txf2lnf[txford[j-1]])  
  876    2   		    fprintf(outfile,",\n");
  877    2   		totsize += add_txf_to_lnf(txf2lnf[k],k);
  878    2   	    }
  879    1   	 
  880    1   	/* [[At this point we ought to add code that writes a message saying how
  881    1   	much font RAM the load will occupy. But there is no documentation for
  882    1   	determining that! So, we make the following compromise:]] */ 
  883    1   	 
  884    1   	    printf("\n Approximate size of font load: %ld bytes",totsize);
  885    1   	 
  886    1   	/* [[We may want to insert a few \n's in the following to keep the line
  887    1   	from getting too long.]] */ 
  888    1   	 
  889    1   	    fprintf(outfile,"\n;Dvi2ln3 1 font load\033\\");
  890    1   	    fprintf(outfile,"\033[1;%ds\033[%dt\033[1;%dr",maxrmar,maxbmar,maxbmar);
  891    1   	    for (j=0; j &lt;= min(maxfontnos,lnfcnt-1); j++) {
  892    2   		useno[j] = j;
  893    2   		whouses[j] = j;
  894    2   	    	k = fname[j][16];
  895    2   	    	fname[j][16] = '\0';
  896    2   		fprintf(outfile,"\033P1;1%d}%s\033\\",j,fname[j]);
  897    2   	    	fname[j][16] = k;
  898    2   	    }
  899    1   	    fprintf(outfile,"\033[10m");
  900    1   	 
  901    1   	    return(0);
  902    1   	 
  903    1   	too_complex:
  904    1   	    printf("\n Can't construct a font load:");
  905    1   	    printf("\n Dvi file uses too many glyphs from too many different fonts.");
  906    1   	    return(1);
  907    1   	 
  908    1   	/* [[We need to determine what the real limit is on the number of LN03
  909    1   	fonts, and refine the test to detect if it is being exceeded. Fortunately,
  910    1   	only a very complex DVI file could exceed the limit.]] */ 
  911    1   	 
  912    1   	need_empty_slots:
  913    1   	    printf("\nFont %s uses &gt; 188 characters. Can't handle that.",
  914    1   	    	font_name[fno]);
  915    1   	    return(1);
  916    1   	 
  917    1   	/* [[The error message above should be fixed to specify the magnification
  918    1   	of the font also.]] */
  919    1   	 
  920    1   	}
  921        	 
  922        	/* The lines in the LN3 file are limited to lengths of about 100 bytes. We

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 18
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  923        	keep track of how many bytes are written so far in the global lnhp. The
  924        	accounting is conservative, so e.g. each pixel position counts as 4 bytes
  925        	even though it might be shorter. [[One could easily increase 100 to 200. It
  926        	is not clear what problems are provoked by going over, say, 256.]] 
  927        	 
  928        	Vpset keeps track of whether the vertical position needs to be output to
  929        	the LN03 file before setting any more characters. Hh_old keeps track of the
  930        	horizontal position which LN03 thinks it's at. */ 
  931        	 
  932        	GLOBAL int ln3p,vpset,hh_old;
  933        	 
  934        	#define inc_ln3p(x) ln3p += x; if (ln3p &gt; 100) \
  935        	    { ln3p = 0; vpset = 0; hh_old = 30000; }
  936        	 
  937        	/* [[In the above macro, hh_old is set to 30000 to mean "a very large
  938        	number" (the maximum valid hh for an LN03 is 2550), so as to force the code
  939        	below to re-output the true hh. What are the implications of this kludge?
  940        	Would it not be more reasonable to have instead an hhset variable?]] */ 
  941        	 
  942        	/* A stack of hvxyzw values is kept; the stack pointer is called s.
  943        	[[Again, it would be better to make this stack a linked list.]] */ 
  944        	 
  945        	#define STACKSIZE 100
  946        	 
  947        	GLOBAL long hstack[STACKSIZE], vstack[STACKSIZE], xstack[STACKSIZE], 
  948        	    ystack[STACKSIZE], zstack[STACKSIZE], wstack[STACKSIZE];
  949        	GLOBAL int hhstack[STACKSIZE], vvstack[STACKSIZE];
  950        	GLOBAL int s;
  951        	 
  952        	/* DVI files specify distances in units of 2^-16 points. When translating
  953        	to a device-specific format, it is necessary to round the DVI distances to
  954        	pixel units. This is done by means of the pixel_round macro. 
  955        	 
  956        	However, rather than using this macro in the straightforward way, rounding
  957        	is often performed by more elaborate techniques, which we call "Stanford
  958        	rules" (after John Le Carre's "Moscow rules"). These rules make use of a
  959        	parameter MAX_DRIFT, which is roughly the maximum number of pixels that
  960        	things are allowed to deviate from straightforward rounding. */ 
  961        	 
  962        	#define pixel_round(x) ((int) ((x&lt;0) ? \
  963        	    (conv*(x)-0.5) : (conv*(x)+0.5)))
  964        	    
  965        	#define MAX_DRIFT 2
  966        	 
  967        	/* Pass2 reads the dvi file and interprets the commands in it, usually by
  968        	calling other routines. The interpretation generally consists of writing
  969        	something into the ln3 file, updating the current fonts and positions, and
  970        	possibly updating the stack. */ 
  971        	 
  972        	int pass2()
  973        	{

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 19
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

  974    1   	    int i,j;
  975    1   	    long int p;
  976    1   	    unsigned int k;
  977    1   	    
  978    1   	    if (read_preamble() != 0) {
  979    2   	    	printf(bad_DVI_message);
  980    2   	    	return(1);
  981    2   	    }
  982    1   	 
  983    1   	    curf = 0;
  984    1   	    ln3p = 0;
  985    1   	    s = 0;
  986    1   	    vpset = 0;
  987    1   	    hh_old = 30000;
  988    1   	 
  989    1   	/* Skip pages until the desired starting page is reached. A nonzero value
  990    1   	is returned if the starting page is never encountered. */ 
  991    1   	 
  992    1   	    if (skip_pages() != 0) return(0); 
  993    1   	 
  994    1   	    for (;;) {
  995    2   	    	if feof(dvifile) { 
  996    3   	            printf(bad_DVI_message);
  997    3   	    	    return(1); }
  998    2   	    	k = getc(dvifile);
  999    2   	    	if (k == post) return(0);
 1000    2   	    	if (k &gt;= undefined_command) {
 1001    3   	            printf(bad_DVI_message);
 1002    3   		    return(1); }
 1003    2   	    	
 1004    2   		p = first_par(k);    
 1005    2   	 
 1006    2   	/* If the opcode is an "implicit parameter" opcode, either set_char_n and
 1007    2   	fnt_num_n, we change it to an explicit parameter opcode to make the case
 1008    2   	jumps more reasonable. */ 
 1009    2   	 
 1010    2   	    	if (k &gt;= set_char_0 &amp;&amp; k &lt; set_char_0+128) k = set1;
 1011    2   	    	if (k &gt;= fnt_num_0 &amp;&amp; k &lt; fnt_num_0+64) k = fnt1;
 1012    2   	 
 1013    2   	    	j = do_command(k,p);
 1014    2   	    	if (j == 2) return(0); /* done with the required number of pages */
 1015    2   	    	else if (j == 1) return(1); /* error encountered, stop */
 1016    2   	 
 1017    2   	    }
 1018    1   	}
 1019        	 
 1020        	/* Read from the DVI file until the starting page condition is met. Return
 1021        	1 if something goes wrong, or if the DVI file comes to an end. This 
 1022        	function is copied quite closely from DVItype. */ 
 1023        	 
 1024        	int skip_pages() {

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 20
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

 1025    1   	 
 1026    1   	    unsigned int k;
 1027    1   	    int i;
 1028    1   	    long p,first_page;
 1029    1   	    char startp;
 1030    1   	    
 1031    1   	    for (;;) {
 1032    2   		if (feof(dvifile)) return(1);
 1033    2   		k = getc(dvifile);
 1034    2   		if (k == post) return(1);
 1035    2   		p = first_par(k);
 1036    2   		if (k &gt;= set_char_0 &amp;&amp; k &lt; set_char_0+128) k = set1;
 1037    2   		if (k &gt;= fnt_num_0 &amp;&amp; k &lt; fnt_num_0+64) k = fnt1;
 1038    2   	 
 1039    2   		switch (k) {
 1040    3   		    case bop:
 1041    3   			startp = 1;
 1042    3   			for (i=0; i&lt;10; i++) {
 1043    4   			    four_bytes;
 1044    4   	    		    if (i == 0) first_page = lcx.l;
 1045    4   			    if (i &lt; how_many_counts &amp;&amp; use_count[i] &amp;&amp;
 1046    4   				    lcx.l != start_page[i]) startp = 0;
 1047    4   			    }
 1048    3   	    		four_bytes;
 1049    3   			if (startp != 0) { 
 1050    4   			    v = 0; vv = 0; h = 0; hh = 0;
 1051    4   		    	    printf("\n [%ld]",first_page);
 1052    4   	    		    num_pages = 1; return(0); }
 1053    3   	    		break;
 1054    3   	    	    case set_rule:
 1055    3   	    	    case put_rule:
 1056    3   	    		four_bytes;
 1057    3   		        break;
 1058    3   		    four_cases(fnt_def1)
 1059    3   		    	i = define_font(p);
 1060    3   		    	if (i != 0) return(1);
 1061    3   		    	break;
 1062    3   		    four_cases(xxx1)
 1063    3   		    	for (; p&gt;0; p--) getc(dvifile);
 1064    3   			break;
 1065    3   	            default:
 1066    3   	    		break;
 1067    3   		}
 1068    2   	    }
 1069    1   	    return(0);
 1070    1   	}
 1071        	 
 1072        	/* Do_command performs the DVI command of code k, assuming the "first
 1073        	parameter" is p. It is assumed that k is not one of set_char0 through
 1074        	set_char127. */ 
 1075        	 

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 21
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

 1076        	int do_command(k,p)
 1077        	int k;
 1078        	long p;
 1079        	{
 1080    1   	    int i,j,l,lnf;
 1081    1   	 
 1082    1   	    switch (k) {
 1083    2   		four_cases(fnt_def1)
 1084    2   		    define_font_pass2();
 1085    2   		    break;
 1086    2   	 
 1087    2   	/* [[In processing the put and set DVI commands, no check is made that the
 1088    2   	character being set actually exists in the font. This can lead to messy
 1089    2   	errors, like access violations or garbage values when one tries to find
 1090    2   	that character's width. Neither is any check made that the horizontal and
 1091    2   	vertical positions fall within the page.]] */ 
 1092    2   	 
 1093    2   		four_cases(put1)
 1094    2   		four_cases(set1)
 1095    2   	    	    if (!vpset) {
 1096    3   	    		fprintf(outfile,"\n\033[%dd\033[%d`",vv+voff,hh+hoff);
 1097    3   	    		ln3p = 16;
 1098    3   	    		vpset = 1;
 1099    3   	    		hh_old = hh;
 1100    3   	    	    }
 1101    2   	    	    if (hh_old != hh) {
 1102    3   	    		if (hh &gt; hh_old) fprintf(outfile,"\033[%da",hh-hh_old);
 1103    3   	    		else fprintf(outfile,"\033[%d`",hh+hoff);
 1104    3   	    		ln3p += 7;
 1105    3   	    	    }
 1106    2   	    	    putc(txfa[curf] -&gt; chu[p],outfile);
 1107    2   	    	    inc_ln3p(1);
 1108    2   		    if (k &gt;= put1) {
 1109    3   	    	        hh_old = hh;
 1110    3   			break;
 1111    3   		    }
 1112    2   		    h += font_width[curf][p];
 1113    2   	 
 1114    2   	/* In rounding h to generate the pixel-position hh, Stanford rules (see
 1115    2   	above) come into play. We set the new hh (horizontal position in pixels) to
 1116    2   	the value obtained by adding the pixel width of the character being set to
 1117    2   	the current position. We then correct this value so that it does not exceed
 1118    2   	the rounded version of the true position by more than MAX_DRIFT pixels.
 1119    2   	 
 1120    2   	Note that if we did not apply Stanford rules here, or equivalently if we
 1121    2   	set MAX_DRIFT to zero, many more set-X-position commands would appear in
 1122    2   	the output. */
 1123    2   	 
 1124    2   		    hh += chw[txf2lnf[curf]][txfa[curf] -&gt; chu[p]];
 1125    2   	    	    hh_old = hh;
 1126    2   		    l = pixel_round(h);

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 22
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 1127    2   		    if (hh-l &gt; MAX_DRIFT) hh = l+MAX_DRIFT;
 1128    2   		    else if (l-hh &gt; MAX_DRIFT) hh = l-MAX_DRIFT;
 1129    2   		    break;
 1130    2   	 
 1131    2   		four_cases(fnt1)
 1132    2   		    set_curf(p);
 1133    2   		    lnf = txf2lnf[curf];
 1134    2   		    if (useno[lnf] == -1) {
 1135    3   			useno[whouses[maxfontnos]] = -1;
 1136    3   			useno[lnf] = maxfontnos;
 1137    3   			whouses[maxfontnos] = lnf;
 1138    3   			fprintf(outfile,"\033P1;1%d}%16s\033\\",maxfontnos,
 1139    3   	    			fname[lnf]);
 1140    3   			inc_ln3p(26);
 1141    3   		    }
 1142    2   		    fprintf(outfile,"\033[1%dm",useno[lnf]);
 1143    2   		    inc_ln3p(5);
 1144    2   		    break;
 1145    2   	 
 1146    2   		case set_rule:
 1147    2   		case put_rule: 
 1148    2   	 
 1149    2   	/* When converting rule dimensions to pixel dimensions, we do not follow
 1150    2   	Stanford rules. Rather, we just round the true positions to obtain the
 1151    2   	pixel positions. This avoids unsightly gaps between rules. [[It should not
 1152    2   	cause much of a problem with typical rule applications (ruled tables,
 1153    2   	fraction bars)...but perhaps with large delimiters there might be some
 1154    2   	difficulty. This needs more thought...]] */ 
 1155    2   	 
 1156    2   		    four_bytes; 
 1157    2   		    if (p &gt;= 0 &amp;&amp; lcx.l &gt;= 0) 
 1158    2   			do_rule(pixel_round(h),
 1159    2   				pixel_round(v-p),pixel_round(h+lcx.l),
 1160    2   				pixel_round(v));
 1161    2   		    if (k == set_rule) {
 1162    3   	    		h += lcx.l;
 1163    3   			hh = pixel_round(h);
 1164    3   		    }
 1165    2   		    break;
 1166    2   	 
 1167    2   		 case push:
 1168    2   		    s++;
 1169    2   		    if (s == STACKSIZE) {
 1170    3   			printf("\n Stack too deep for Dvi2ln3");
 1171    3   			return(1);
 1172    3   		    }
 1173    2   		    xstack[s] = x;
 1174    2   		    ystack[s] = y;
 1175    2   		    vstack[s] = v;
 1176    2   		    hstack[s] = h;
 1177    2   		    vvstack[s] = vv;

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 23
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 1178    2   		    hhstack[s] = hh;
 1179    2   		    wstack[s] = w;
 1180    2   		    zstack[s] = z;
 1181    2   		    break;
 1182    2   	 
 1183    2   		case pop:
 1184    2   		    if (s == 0) { 		   
 1185    3   			printf(bad_DVI_message); 
 1186    3   			return(1); 
 1187    3   		    }
 1188    2   	    	    if (vv != vvstack[s]) vpset = 0;
 1189    2   		    x = xstack[s]; 
 1190    2   		    y = ystack[s];    
 1191    2   		    v = vstack[s]; 
 1192    2   		    h = hstack[s];    
 1193    2   		    vv = vvstack[s]; 
 1194    2   		    hh = hhstack[s];    
 1195    2   		    w = wstack[s]; 
 1196    2   		    z = zstack[s];
 1197    2   		    s--; 
 1198    2   		    break; 
 1199    2   	 
 1200    2   	/* Right now there are no \special's defined, so when we get a \special, we
 1201    2   	just skip over it. */ 
 1202    2   	 
 1203    2   		four_cases(xxx1)
 1204    2   		    for (; p != 0; p--) getc(dvifile);
 1205    2   		    break;
 1206    2   	 
 1207    2   		case bop:
 1208    2   	 
 1209    2   	/* If we've done the required number of pages, we'll skip the rest of the
 1210    2   	DVI file. If not, type the first parameter of bop on the user's terminal
 1211    2   	the way TeX does, to give an indication of progress. */ 
 1212    2   	 
 1213    2   	    	    if (num_pages == max_pages) return(2);
 1214    2   		    v = 0; vv = 0; h = 0; hh = 0;
 1215    2   	    	    vpset = 0; hh_old = 100000;
 1216    2   	    	    four_bytes;
 1217    2   		    if (num_pages%12 == 0) printf("\n");
 1218    2   		    printf(" [%ld]",lcx.ul);
 1219    2   	            num_pages++;
 1220    2   		    for (i = 0; i&lt;40; i++) getc(dvifile); 
 1221    2   		    break;
 1222    2   	 
 1223    2   		case eop:
 1224    2   		    fprintf(outfile,"\n\f");
 1225    2   		    ln3p = 0;
 1226    2   		    break;
 1227    2   	 
 1228    2   	/* Now we have to consider the cases for pure motion. */

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 24
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

 1229    2   	 
 1230    2   		four_cases(right1)
 1231    2   		    set_h(h+p);
 1232    2   		    break;
 1233    2   		four_cases(x1)
 1234    2   		    x = p;
 1235    2   		case x0:
 1236    2   		    set_h(h+x);
 1237    2   		    break;
 1238    2   		four_cases(y1)
 1239    2   		    y = p;
 1240    2   		case y0:
 1241    2   		    set_v(v+y);
 1242    2   		    break;
 1243    2   		four_cases(w1)
 1244    2   		    w = p;
 1245    2   		case w0:
 1246    2   		    set_h(h+w);
 1247    2   		    break;
 1248    2   		four_cases(z1)
 1249    2   		    z = p;
 1250    2   		case z0:
 1251    2   		    set_v(v+z);
 1252    2   		    break;
 1253    2   		four_cases(down1)
 1254    2   		    set_v(v+p);
 1255    2   		    break;
 1256    2   	 
 1257    2   	    }	
 1258    1   	    return(0);
 1259    1   	}
 1260        	 
 1261        	/* Set_curf sets the current font to external number p. Note that the
 1262        	current font is maintained as an internal font number. */ 
 1263        	 
 1264        	int set_curf(p)
 1265        	int p;
 1266        	{
 1267    1   	    to_ext[nf] = p;
 1268    1   	    curf = 0;
 1269    1   	    while (to_ext[curf] != p) { curf++; }    
 1270    1   	}
 1271        	 
 1272        	/* Define_font processes a font definition from the DVI file. The TFM file
 1273        	for the font is read at this point from the directory TEX$FONTS. */ 
 1274        	 
 1275        	int define_font(e)
 1276        	int e;
 1277        	{
 1278    1   	    int i;
 1279    1   	    unsigned char p,n;

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 25
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 1280    1   	    if (e == MAXTEXFONTS) { printf("\n Too many fonts for Dvi2ln3");
 1281    2   	    	return(1); }
 1282    1   	    txfa[nf] = malloc(sizeof(struct txf));
 1283    1   	    to_ext[nf] = e;
 1284    1   	    four_bytes;
 1285    1   	    four_bytes;
 1286    1   	    txfa[nf] -&gt; scaled_size = lcx.l;
 1287    1   	    four_bytes;
 1288    1   	    txfa[nf] -&gt; design_size = lcx.l;
 1289    1   	    for (i=0; i&lt;256; i++) txfa[nf] -&gt; chu[i] = '\0';
 1290    1   	    p = getc(dvifile); n = getc(dvifile);
 1291    1   	    font_name[nf] = malloc(p+n+1);
 1292    1   	    for (i=0; i&lt;p+n; i++) { font_name[nf][i] = getc(dvifile); }
 1293    1   	    font_name[nf][p+n] = '\0';
 1294    1   	 
 1295    1   	    if (txfa[nf] -&gt; scaled_size &lt;= 0 || txfa[nf] -&gt; scaled_size &gt;=
 1296    1   	    	8*8*8*8*8*8*8*8*8) {
 1297    2   	    	printf("\n Font %s has a bad scaled size",font_name[nf]);
 1298    2   	    	return(1);
 1299    2   	    }
 1300    1   	    if (txfa[nf] -&gt; design_size &lt;= 0 || txfa[nf] -&gt; design_size &gt;= 
 1301    1   	    	8*8*8*8*8*8*8*8*8) {
 1302    2   	    	printf("\n Font %s has a bad design size",font_name[nf]);
 1303    2   	    	return(1);
 1304    2   	    }
 1305    1   	 
 1306    1   	/* We follow DVItype and compute for each font a "space" parameter which is
 1307    1   	one-sixth of the scaled design size. This parameter is used in rounding the
 1308    1   	horizontal position to pixels according to "Stanford rules." See the
 1309    1   	function set_h below. */ 
 1310    1   	 
 1311    1   	    txfa[nf] -&gt; space = txfa[nf] -&gt; scaled_size/6;     
 1312    1   	 
 1313    1   	    i = read_tfm_file();
 1314    1   	    if (i != 0) return(i);
 1315    1   	    nf++;
 1316    1   	    return(0); 
 1317    1   	 
 1318    1   	}
 1319        	 
 1320        	/* TFM files, like the DVI file, are read with getc, foolish as that may
 1321        	seem. We use the same overlays that are used for merging DVI bytes into
 1322        	longwords. However, since the TFM file consists of longwords, only
 1323        	tfm_longword is need. [[This is also VAX dependent. It would not be
 1324        	possible to use stdio's longword reading function getw here, because the
 1325        	bytes have to be reversed.]] */ 
 1326        	 
 1327        	#define tfm_longword { lcx.uc[3] = getc(tfmfile); \
 1328        	    lcx.uc[2] = getc(tfmfile); lcx.uc[1] = getc(tfmfile); \
 1329        	    lcx.uc[0] = getc(tfmfile); }
 1330        	 

DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 26
V1.0                                                            14-OCT-1985 13:19:01    USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)

 1331        	/* Read_tfm_file obtains the character widths from the TFM file
 1332        	corresponding to font nf. */ 
 1333        	 
 1334        	int read_tfm_file() {
 1335    1   	 
 1336    1   	    int i,lh,nw;
 1337    1   	    int info[256];
 1338    1   	    long z,alpha,beta;
 1339    1   	    long width[256];
 1340    1   	 
 1341    1   	    open_tfm_file();
 1342    1   	    if (tfmfile == NULL) {
 1343    2   	    	printf("\n Can't open TFM file for font %s",font_name[nf]);
 1344    2   	    	return(1); }
 1345    1   	 
 1346    1   	/* The TFM format is described in some issue of the TUGBoat (TeX users'
 1347    1   	group newsletter), and in the comments to the program TFtoPL. Here we
 1348    1   	summarize those aspects of TFM format that are relevant to the task of
 1349    1   	extracting the widths of the characters. 
 1350    1   	 
 1351    1   	The first 24 bytes of a TFM file contain twelve 16-bit integers that give
 1352    1   	the lengths of the various subsequent portions of the file. The ones
 1353    1   	relevant to our purposes are LH, length of the header data, BC, the
 1354    1   	smallest character code in the font, EC, the largest character code in the
 1355    1   	font, and NW, number of words in the width table. So, we read those right
 1356    1   	now, and then skip over the remainder, and then over a set of LH longwords
 1357    1   	called the "header." */ 
 1358    1   	 
 1359    1   	    tfm_longword; 
 1360    1   	    lh = 256*lcx.uc[1] + lcx.uc[0];
 1361    1   	    tfm_longword;
 1362    1   	    txfa[nf] -&gt; bc = 256*lcx.uc[3] + lcx.uc[2];
 1363    1   	    txfa[nf] -&gt; ec = 256*lcx.uc[1] + lcx.uc[0];
 1364    1   	    tfm_longword;
 1365    1   	    nw = 256*lcx.uc[3] + lcx.uc[2];
 1366    1   	    if (txfa[nf] -&gt; bc &gt; 255 || txfa[nf] -&gt; ec &gt; 255 ||
 1367    1   	    	txfa[nf] -&gt; bc &gt; txfa[nf] -&gt; ec || nw &gt; 256) {
 1368    2   	    	printf("\n Bad TFM file for font %s",font_name[nf]);
 1369    2   	    	return(1);
 1370    2   	    }    	
 1371    1   	 
 1372    1   	    for(i=0; i&lt;lh+3; i++) tfm_longword;
 1373    1   	 
 1374    1   	/* After the header, there are two arrays in the TFM file that interest us.
 1375    1   	The first, INFO, is EC-BC+1 longwords long and contains pointers to the
 1376    1   	second, WIDTH, which is NW longwords long. For each character i, the width
 1377    1   	of i is WIDTH[INFO[i-BC]]. We read these arrays into memory. */ 
 1378    1   	 
 1379    1   	    for(i=0; i&lt;txfa[nf] -&gt; ec-txfa[nf] -&gt; bc+1; i++) {
 1380    2   	    	tfm_longword;
 1381    2   	    	if (lcx.uc[3] &gt;= nw) {

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 1382    3   		    printf("\n Bad TFM file for font %s",font_name[nf]);
 1383    3   		    return(1);
 1384    3   		}	    
 1385    2   	    	info[i] = lcx.uc[3];
 1386    2   	    }
 1387    1   	 
 1388    1   	/* The widths are stored in a rather strange format known as a "fix-word."
 1389    1   	A nonnegative width is expressed in "fix-word" format by expressing it in
 1390    1   	units of 2^-20 times the design size. A negative width is expressed in
 1391    1   	"fix-word" format by expressing its negative in those units, and then
 1392    1   	changing the most significant byte to 255. 
 1393    1   	 
 1394    1   	One needs to convert these widths into DVI units, multiplying by the scaled
 1395    1   	design size according to a certain arcane algorithm. The algorithm is
 1396    1   	copied from DVItype, to which we refer the reader for an explanation. */ 
 1397    1   	 
 1398    1   	    z = txfa[nf] -&gt; scaled_size;
 1399    1   	    alpha = 16*z; beta = 16;
 1400    1   	    while (z &gt;= 4*(8*8*8*8*8*8*8)) { z = z/2; beta = beta/2; }
 1401    1   	    for(i=0; i&lt;nw; i++) {
 1402    2   	    	tfm_longword;
 1403    2   	    	width[i] = ( ( (lcx.uc[0]*z)/256 + lcx.uc[1]*z )/256  + 
 1404    2   	    		lcx.uc[2]*z)/beta;
 1405    2   	    	if (lcx.uc[3] == 255) width[i] -= alpha;
 1406    2   	    }
 1407    1   	 
 1408    1   	    fclose(tfmfile);
 1409    1   	 
 1410    1   	/* Using these two arrays, we now compute the widths of the characters in
 1411    1   	the fonts and place them into two malloc'ed arrays, one for the widths in
 1412    1   	DVI units, one for the width in pixel units. */ 
 1413    1   	 
 1414    1   	    font_width[nf] = malloc(4*(txfa[nf] -&gt; ec+1));
 1415    1   	    
 1416    1   	    for (i=0; i&lt;txfa[nf] -&gt; bc; i++) font_width[nf][i] = 0;
 1417    1   	    for (i=txfa[nf] -&gt; bc; i &lt;= txfa[nf] -&gt; ec; i++) 
 1418    1   		font_width[nf][i] = width[info[i-txfa[nf] -&gt; bc]];
 1419    1   	    return(0);
 1420    1   	}
 1421        	 
 1422        	/* Open_tfm_file finds and opens the tfm file corresponding to a font nf.
 1423        	The global file variable tfmfile is used to hold the file pointer. [[This
 1424        	function will not work if the TFM file lies over the net on a VMS V3.x
 1425        	host, because C file opens do not work in such circumstances. The problem
 1426        	can be ignored, because eventually there should be no VMS V3.x hosts
 1427        	left.]] */ 
 1428        	 
 1429        	int open_tfm_file () {
 1430    1   	 
 1431    1   	    int jext,jnam;
 1432    1   	    char filespec[FILESPECLEN];

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 1433    1   	 
 1434    1   	    find_VMS_filename(font_name[nf],&amp;jnam,&amp;jext);
 1435    1   	    filespec[0] = '\0';
 1436    1   	 
 1437    1   	/* If there is no directory part, fill in using the logical tex$fonts */ 
 1438    1   	 
 1439    1   	    if (jnam == 0) strcpy(filespec,"tex$fonts:");
 1440    1   	    strcat(filespec,font_name[nf]);
 1441    1   	 
 1442    1   	/* if there is no extension, add the extension ".tfm" */
 1443    1   	 
 1444    1   	    if (font_name[nf][jext] == '\0') strcat(filespec,".tfm");
 1445    1   	    tfmfile = fopen(filespec,"r");
 1446    1   	 
 1447    1   	}
 1448        	 
 1449        	/* Define_font_pass2 skips a font definition from the DVI file. */ 
 1450        	 
 1451        	int define_font_pass2()
 1452        	{
 1453    1   	    unsigned char p,n;
 1454    1   	    int i;
 1455    1   	    four_bytes;
 1456    1   	    four_bytes;
 1457    1   	    four_bytes;
 1458    1   	    p = getc(dvifile); n = getc(dvifile);
 1459    1   	    for (i=0; i&lt;p+n; i++) getc(dvifile);
 1460    1   	}
 1461        	 
 1462        	/* Do_rule writes into the ln3 file the escape sequence corresponding
 1463        	to a rule. */
 1464        	 
 1465        	int do_rule(xx0,yy0,xx1,yy1) 
 1466        	int xx0,yy0,xx1,yy1;
 1467        	{
 1468    1   	    int j;
 1469    1   	 
 1470    1   	    xx0 = min(xx0+hoff,maxrmar);
 1471    1   	    xx1 = min(xx1+hoff,maxrmar);
 1472    1   	    xx0 = max(xx0,0);
 1473    1   	    xx1 = max(xx1,0);
 1474    1   	    yy0 = min(yy0+voff,maxbmar);
 1475    1   	    yy1 = min(yy1+voff,maxbmar);
 1476    1   	    yy0 = max(yy0,0);
 1477    1   	    yy1 = max(yy1,0);
 1478    1   	    if (xx0 &gt; xx1) { j = xx0; xx0 = xx1; xx1 = j; }
 1479    1   	    if (yy0 &gt; yy1) { j = yy0; yy0 = yy1; yy1 = j; }
 1480    1   	    	    
 1481    1   	    if ((yy1 != yy0 &amp;&amp; xx1 != xx0)) {
 1482    2   		fprintf(outfile,"\033[1;%d;%d;%d;%d!|",
 1483    2   		    xx0,yy0,yy1-yy0,xx1-xx0);

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 1484    2   		inc_ln3p(25);
 1485    2   	    }
 1486    1   	}
 1487        	 
 1488        	/* Set_v is called to execute vertical-position-altering commands, other
 1489        	than pops. It modifies v and vv, and outputs the vertical position to the
 1490        	LN3 file. We don't follow Stanford rules here. They sometimes set the
 1491        	vertical position in pixels vv to something other than the rounded value of
 1492        	v. Not following Stanford rules implies, for example, that the relative
 1493        	vertical positions of an accent and its accentee may differ by one pixel
 1494        	according to how the baseline of the accentee gets rounded. [[This should
 1495        	perhaps be fixed.]] */ 
 1496        	 
 1497        	int set_v(v1)
 1498        	int v1;
 1499        	{
 1500    1   	    int l;
 1501    1   	 
 1502    1   	    l = pixel_round(v1);
 1503    1   	    v = v1;
 1504    1   	    vv = l;
 1505    1   	    vpset = 0;
 1506    1   	}    
 1507        	 
 1508        	/* Set_h is called whenever a DVI command is encountered that alters the
 1509        	horizonal position, other than a set_char, set_rule or pop. It sets h to
 1510        	the new value, and alters hh according to Stanford rules, printing the new
 1511        	hh in the LN3 file. */ 
 1512        	 
 1513        	int set_h(new_h)
 1514        	int new_h;   
 1515        	{
 1516    1   	    int l,old_hh;
 1517    1   	 
 1518    1   	    old_hh = hh;
 1519    1   	    l = pixel_round(new_h);
 1520    1   	    if (txfa[curf] == 0 || new_h-h &gt;= txfa[curf] -&gt; space
 1521    1   	    	|| new_h-h &lt;= -4*txfa[curf] -&gt; space) hh = l;
 1522    1   	    else {
 1523    2   	    	hh += pixel_round(new_h-h);
 1524    2   	        if (hh-l &gt; MAX_DRIFT) hh = l+MAX_DRIFT;
 1525    2   	    	else if (hh-l &lt; -MAX_DRIFT) hh = l-MAX_DRIFT;
 1526    2   	    }
 1527    1   	    h = new_h;
 1528    1   	    return(0);
 1529    1   	}

 
 
Command Line
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DVI2LN3                                                         14-OCT-1985 13:19:13    VAX C      V2.0-003                 Page 30
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CC/DEB/LIS DVI2LN3

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