text2post.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <bio.h>
#include <comments.h>
#include <path.h>

#define UNKNOWNCHAR	"/sys/lib/postscript/prologues/pjw.char.ps"

char	*optnames = "a:c:f:l:m:n:o:p:s:t:x:y:P:";

Biobuf *bstdin, *bstdout, *bstderr;
Biobufhdr *Bstdin, *Bstdout, *Bstderr;
int char_no = 0;		/* character to be done on a line */
int line_no = 0;		/* line number on a page */
int page_no = 0;		/* page number in a document */
int in_string;		/* Boolean, to know whether or not we are inside a Postscript string */
int spaces = 0;
int tabs = 0;
int pages_printed;
double aspectratio = 1.0;
int copies = 1;
double magnification = 1.0;
int landscape = 0;
int formsperpage = 1;
int linesperpage = 66;
int pointsize = 10;
double xoffset = .25;
double yoffset = .25;
char *passthrough = 0;
static int pplistmaxsize=0;

unsigned char *pplist=0;	/* bitmap list for storing pages to print */

struct strtab {
	int size;
	char *str;
	int used;
};

struct strtab charcode[256] = {
	{4, "\\000"}, {4, "\\001"}, {4, "\\002"}, {4, "\\003"},
	{4, "\\004"}, {4, "\\005"}, {4, "\\006"}, {4, "\\007"},
	{4, "\\010"}, {4, "\\011"}, {4, "\\012"}, {4, "\\013"},
	{4, "\\014"}, {4, "\\015"}, {4, "\\016"}, {4, "\\017"},
	{4, "\\020"}, {4, "\\021"}, {4, "\\022"}, {4, "\\023"},
	{4, "\\024"}, {4, "\\025"}, {4, "\\026"}, {4, "\\027"},
	{4, "\\030"}, {4, "\\031"}, {4, "\\032"}, {4, "\\033"},
	{4, "\\034"}, {4, "\\035"}, {4, "\\036"}, {4, "\\037"},
	{1, " "}, {1, "!"}, {1, "\""}, {1, "#"},
	{1, "$"}, {1, "%"}, {1, "&"}, {1, "'"},
	{2, "\\("}, {2, "\\)"}, {1, "*"}, {1, "+"},
	{1, ","}, {1, "-"}, {1, "."}, {1, "/"},
	{1, "0"}, {1, "1"}, {1, "2"}, {1, "3"},
	{1, "4"}, {1, "5"}, {1, "6"}, {1, "7"},
	{1, "8"}, {1, "9"}, {1, ":"}, {1, ";"},
	{1, "<"}, {1, "="}, {1, ">"}, {1, "?"},
	{1, "@"}, {1, "A"}, {1, "B"}, {1, "C"},
	{1, "D"}, {1, "E"}, {1, "F"}, {1, "G"},
	{1, "H"}, {1, "I"}, {1, "J"}, {1, "K"},
	{1, "L"}, {1, "M"}, {1, "N"}, {1, "O"},
	{1, "P"}, {1, "Q"}, {1, "R"}, {1, "S"},
	{1, "T"}, {1, "U"}, {1, "V"}, {1, "W"},
	{1, "X"}, {1, "Y"}, {1, "Z"}, {1, "["},
	{2, "\\\\"}, {1, "]"}, {1, "^"}, {1, "_"},
	{1, "`"}, {1, "a"}, {1, "b"}, {1, "c"},
	{1, "d"}, {1, "e"}, {1, "f"}, {1, "g"},
	{1, "h"}, {1, "i"}, {1, "j"}, {1, "k"},
	{1, "l"}, {1, "m"}, {1, "n"}, {1, "o"},
	{1, "p"}, {1, "q"}, {1, "r"}, {1, "s"},
	{1, "t"}, {1, "u"}, {1, "v"}, {1, "w"},
	{1, "x"}, {1, "y"}, {1, "z"}, {1, "{"},
	{1, "|"}, {1, "}"}, {1, "~"}, {4, "\\177"},
	{4, "\\200"}, {4, "\\201"}, {4, "\\202"}, {4, "\\203"},
	{4, "\\204"}, {4, "\\205"}, {4, "\\206"}, {4, "\\207"},
	{4, "\\210"}, {4, "\\211"}, {4, "\\212"}, {4, "\\213"},
	{4, "\\214"}, {4, "\\215"}, {4, "\\216"}, {4, "\\217"},
	{4, "\\220"}, {4, "\\221"}, {4, "\\222"}, {4, "\\223"},
	{4, "\\224"}, {4, "\\225"}, {4, "\\226"}, {4, "\\227"},
	{4, "\\230"}, {4, "\\231"}, {4, "\\232"}, {4, "\\233"},
	{4, "\\234"}, {4, "\\235"}, {4, "\\236"}, {4, "\\237"},
	{4, "\\240"}, {4, "\\241"}, {4, "\\242"}, {4, "\\243"},
	{4, "\\244"}, {4, "\\245"}, {4, "\\246"}, {4, "\\247"},
	{4, "\\250"}, {4, "\\251"}, {4, "\\252"}, {4, "\\253"},
	{4, "\\254"}, {4, "\\255"}, {4, "\\256"}, {4, "\\257"},
	{4, "\\260"}, {4, "\\261"}, {4, "\\262"}, {4, "\\263"},
	{4, "\\264"}, {4, "\\265"}, {4, "\\266"}, {4, "\\267"},
	{4, "\\270"}, {4, "\\271"}, {4, "\\272"}, {4, "\\273"},
	{4, "\\274"}, {4, "\\275"}, {4, "\\276"}, {4, "\\277"},
	{4, "\\300"}, {4, "\\301"}, {4, "\\302"}, {4, "\\303"},
	{4, "\\304"}, {4, "\\305"}, {4, "\\306"}, {4, "\\307"},
	{4, "\\310"}, {4, "\\311"}, {4, "\\312"}, {4, "\\313"},
	{4, "\\314"}, {4, "\\315"}, {4, "\\316"}, {4, "\\317"},
	{4, "\\320"}, {4, "\\321"}, {4, "\\322"}, {4, "\\323"},
	{4, "\\324"}, {4, "\\325"}, {4, "\\326"}, {4, "\\327"},
	{4, "\\330"}, {4, "\\331"}, {4, "\\332"}, {4, "\\333"},
	{4, "\\334"}, {4, "\\335"}, {4, "\\336"}, {4, "\\337"},
	{4, "\\340"}, {4, "\\341"}, {4, "\\342"}, {4, "\\343"},
	{4, "\\344"}, {4, "\\345"}, {4, "\\346"}, {4, "\\347"},
	{4, "\\350"}, {4, "\\351"}, {4, "\\352"}, {4, "\\353"},
	{4, "\\354"}, {4, "\\355"}, {4, "\\356"}, {4, "\\357"},
	{4, "\\360"}, {4, "\\361"}, {4, "\\362"}, {4, "\\363"},
	{4, "\\364"}, {4, "\\365"}, {4, "\\366"}, {4, "\\367"},
	{4, "\\370"}, {4, "\\371"}, {4, "\\372"}, {4, "\\373"},
	{4, "\\374"}, {4, "\\375"}, {4, "\\376"}, {4, "\\377"}
};

#define FONTABSIZE 0x27

struct strtab fontname[FONTABSIZE] = {
	{19, "LucidaSansUnicode00", 0},
	{19, "LucidaSansUnicode01", 0},
	{19, "LucidaSansUnicode02", 0},
	{19, "LucidaSansUnicode03", 0},
	{19, "LucidaSansUnicode04", 0},
	{19, "LucidaSansUnicode05", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{0, "", 0},
	{19, "LucidaSansUnicode20", 0},
	{19, "LucidaSansUnicode21", 0},
	{19, "LucidaSansUnicode22", 0},
	{0, "", 0},
	{19, "LucidaSansUnicode24", 0},
	{19, "LucidaSansUnicode25", 0},
	{7, "Courier", 0}
};

/* This was taken from postprint */

int
cat(char *filename) {
	Biobuf *bfile;
	Biobufhdr *Bfile;
	int n;
	static char buf[Bsize];

	bstdin = Bopen(filename, 0);
	if (bstdin == 0) {
		return(1);
	}
	Bstdin = &(bstdin->Biobufhdr);
	if ((bfile = Bopen(filename, OREAD)) == 0) {
		return(1);
	}
	Bfile = &(bfile->Biobufhdr);
	while ((n=Bread(Bfile, buf, Bsize)) > 0) {
		if (Bwrite(Bstdout, buf, n) != n) {
			return(1);
		}
	}
	if (n != 0) {
		return(1);
	}
	return(0);
}

void
prologues(void) {
	char *ts;
	int tabstop;

	Bprint(Bstdout, "%s", CONFORMING);
	Bprint(Bstdout, "%s %s\n", VERSION, PROGRAMVERSION);
	Bprint(Bstdout, "%s %s\n", DOCUMENTFONTS, ATEND);
	Bprint(Bstdout, "%s %s\n", PAGES, ATEND);
	Bprint(Bstdout, "%s", ENDCOMMENTS);

	if (cat(POSTPRINT)) {
		Bprint(Bstderr, "can't read %s", POSTPRINT);
		exits("prologue");
	}

	if (DOROUND)
		cat(ROUNDPAGE);

	tabstop = 0;
	ts = getenv("tabstop");
	if(ts != nil)
		tabstop = strtol(ts, nil, 0);
	if(tabstop == 0)
		tabstop = 8;
	Bprint(Bstdout, "/f {findfont pointsize scalefont setfont} bind def\n");
	Bprint(Bstdout, "/tabwidth /Courier f (");
	while(tabstop--)
		Bputc(Bstdout, 'n');
	Bprint(Bstdout, ") stringwidth pop def\n");
	Bprint(Bstdout, "/tab {tabwidth 0 ne {currentpoint 3 1 roll exch tabwidth mul add tabwidth\n");
	Bprint(Bstdout, "\tdiv truncate tabwidth mul exch moveto} if} bind def\n");
	Bprint(Bstdout, "/spacewidth /%s f ( ) stringwidth pop def\n", fontname[0].str);
	Bprint(Bstdout, "/sp {spacewidth mul 0 rmoveto} bind def\n");
	Bprint(Bstdout, "%s", ENDPROLOG);
	Bprint(Bstdout, "%s", BEGINSETUP);
	Bprint(Bstdout, "mark\n");

	if (formsperpage > 1) {
		Bprint(Bstdout, "%s %d\n", FORMSPERPAGE, formsperpage);
		Bprint(Bstdout, "/formsperpage %d def\n", formsperpage);
	}
	if (aspectratio != 1) Bprint(Bstdout, "/aspectratio %g def\n", aspectratio);
	if (copies != 1) Bprint(Bstdout, "/#copies %d store\n", copies);
	if (landscape) Bprint(Bstdout, "/landscape true def\n");
	if (magnification != 1) Bprint(Bstdout, "/magnification %s def\n", magnification);
	if (pointsize != 10) Bprint(Bstdout, "/pointsize %d def\n", pointsize);
	if (xoffset != .25) Bprint(Bstdout, "/xoffset %g def\n", xoffset);
	if (yoffset != .25) Bprint(Bstdout, "/yoffset %g def\n", yoffset);
	cat(ENCODINGDIR"/Latin1.enc");
	if (passthrough != 0) Bprint(Bstdout, "%s\n", passthrough);
	Bprint(Bstdout, "setup\n");
	if (formsperpage > 1) {
		cat(FORMFILE);
		Bprint(Bstdout, "%d setupforms \n", formsperpage);
	}
	if (cat(UNKNOWNCHAR))
		Bprint(Bstderr, "cannot open %s\n", UNKNOWNCHAR);
	Bprint(Bstdout, "%s", ENDSETUP);
}

int
pageon(void) {
	if (pplist == 0 && page_no != 0) return(1);	/* no page list, print all pages */
	if (page_no/8 < pplistmaxsize && (pplist[page_no/8] & 1<<(page_no%8)))
		return(1);
	else
		return(0);
}

void
startpage(void) {
	++char_no;
	++line_no;
	++page_no;
	if (pageon()) {
		++pages_printed;
		Bprint(Bstdout, "%s %d %d\n", PAGE, page_no, pages_printed);
		Bprint(Bstdout, "/saveobj save def\n");
		Bprint(Bstdout, "mark\n");
		Bprint(Bstdout, "%d pagesetup\n", pages_printed);
	}
}

void
endpage(void) {
	line_no = 0;
	char_no = 0;
	if (pageon()) {
		Bprint(Bstdout, "cleartomark\n");
		Bprint(Bstdout, "showpage\n");
		Bprint(Bstdout, "saveobj restore\n");
		Bprint(Bstdout, "%s %d %d\n", ENDPAGE, page_no, pages_printed);
	}
}

void
startstring(void) {
	if (!in_string) {
		if (pageon()) Bprint(Bstdout, "(");
		in_string = 1;
	}
}

void
endstring(void) {
	if (in_string) {
		if (pageon()) Bprint(Bstdout, ") show ");
		in_string = 0;
	}
}

void
prspace(void) {
	if (spaces) {
		endstring();
		if (pageon()) Bprint(Bstdout, "%d sp ", spaces);
		spaces = 0;
	}
}

void
prtab(void) {
	if (tabs) {
		endstring();
		if (pageon()) Bprint(Bstdout, "%d tab ", tabs);
		tabs = 0;
	}
}

void
txt2post(void) {
	int lastfont = -1;
	int lastchar = -1;
	int thisfont, thischar;
	long r;

	in_string = 0;
	char_no = 0;
	line_no = 0;
	page_no = 0;
	spaces = 0;
	fontname[0].used++;
	while ((r=Bgetrune(Bstdin)) >= 0) {
		thischar = r & 0xff;
		thisfont = (r>>8) & 0xff;

		if (line_no == 0 && char_no == 0)
			startpage();

		if (line_no == 1 && char_no == 1) {
			if (pageon()) Bprint(Bstdout, " /%s f\n", fontname[thisfont].str);
			lastfont = thisfont;
		}

		switch (r) {
		case ' ':
			prtab();
			if (lastfont > 0) {
				spaces++;
				continue;
			}
			break;
		case '\n':
		case '\f':
			startstring();
			if (pageon()) Bprint(Bstdout, ")l\n");
			char_no = 1;
			in_string = 0;
			spaces = 0;
			tabs = 0;
			if (++line_no > linesperpage || r == '\f') {
				endpage();
			}
			lastchar = -1;
			continue;
		case '\t':
			prspace();
			tabs++;
			char_no++;
			lastchar = -1;
			continue;
		case '\b':
			/* just toss out backspaces for now */
			if (lastchar != -1) {
				endstring();
				if (pageon()) Bprint(Bstdout, "(%s) stringwidth pop neg 0 rmoveto ", charcode[lastchar].str);
			}
			char_no++;
			lastchar = -1;
			continue;
		}

		/* do something if font is out of table range */
		if (thisfont>=FONTABSIZE || fontname[thisfont].size == 0) {
			prspace();
			prtab();
			endstring();
			Bprint(Bstdout, "pw ");
			char_no++;
			lastchar = -1;
			continue;
		}

		if (thisfont != lastfont) {
			endstring();
			if (pageon()) {
				Bprint(Bstdout, "/%s f\n", fontname[thisfont].str);
			}
			fontname[thisfont].used++;
		}
		prspace();
		prtab();
		startstring();
		if (pageon()) Bprint(Bstdout, "%s", charcode[thischar].str);
/*		if (pageon()) Bprint(Bstdout, "%2.2x", thischar);	/* try hex strings*/
		char_no++;
		lastchar = thischar;
		lastfont = thisfont;
	}
	if (line_no != 0 || char_no != 0) {
		if (char_no != 1) {
			Bprint(Bstderr, "premature EOF: newline appended\n");
			startstring();
			if (pageon()) Bprint(Bstdout, ")l\n");
		}
		endpage();
	}
}

void
pagelist(char *list) {
	char c;
	int n, m;
	int state, start, end;

	if (list == 0) return;
	state = 1;
	while ((c=*list) != '\0') {
		n = 0;
		while (isdigit(c)) {
			n = n * 10 + c - '0';
			c = *++list;
		}
		switch (state) {
		case 1:
			start = n;
		case 2:
			if (n/8+1 > pplistmaxsize) {
				pplistmaxsize = n/8+1;
				if ((pplist = realloc(pplist, n/8+1)) == 0) {
					Bprint(Bstderr, "cannot allocate memory for page list\n");
					exits("malloc");
				}
			}
			for (m=start; m<=n; m++)
				pplist[m/8] |= 1<<(m%8);
			break;
		}
		switch (c) {
		case '-':
			state = 2;
			list++;
			break;
		case ',':
			state = 1;
			list++;
			break;
		case '\0':
			break;
		}
	}
}

void
finish(void) {
	int i;

	Bprint(Bstdout, "%s", TRAILER);
	Bprint(Bstdout, "done\n");
	Bprint(Bstdout, "%s", DOCUMENTFONTS);

	for (i=0; i<FONTABSIZE; i++)
		if (fontname[i].used)
			Bprint(Bstdout, " %s", fontname[i].str);
	Bprint(Bstdout, "\n");

	Bprint(Bstdout, "%s %d\n", PAGES, pages_printed);

}

main(int argc, char *argv[]) {
	int i;
	char *t;
	Biobuf *input;

	if ((bstderr = (Biobuf *)malloc(sizeof(Biobuf))) < (Biobuf *)0)
		exits("malloc");
	if (Binit(bstderr, 2, OWRITE) == Beof)
		exits("Binit");
	Bstderr = &(bstderr->Biobufhdr);

	if ((bstdout = (Biobuf *)malloc(sizeof(Biobuf))) < (Biobuf *)0)
		exits("malloc");
	if (Binit(bstdout, 1, OWRITE) == Beof)
		exits("Binit");
	Bstdout = &(bstdout->Biobufhdr);

	ARGBEGIN{
		case 'a':			/* aspect ratio */
			aspectratio = atof(ARGF());
			break;
		case 'c':			/* copies */
			copies = atoi(ARGF());
			break;
		case 'f':			/* primary font, for now */
			t = ARGF();
			fontname[0].str = malloc(strlen(t)+1);
			strcpy(fontname[0].str, t);
			break;
		case 'l':			/* lines per page */
			linesperpage = atoi(ARGF());
			break;
		case 'm':			/* magnification */
			magnification = atof(ARGF());
			break;
		case 'n':			/* forms per page */
			formsperpage = atoi(ARGF());
			break;
		case 'o':			/* output page list */
			pagelist(ARGF());
			break;
		case 'p':			/* landscape or portrait mode */
			if ( ARGF()[0] == 'l' )
				landscape = 1;
			else
				landscape = 0;
			break;
		case 's':			/* point size */
			pointsize = atoi(ARGF());
			break;
		case 'x':			/* shift things horizontally */
			xoffset = atof(ARGF());
			break;

		case 'y':			/* and vertically on the page */
			yoffset = atof(ARGF());
			break;
		case 'P':			/* PostScript pass through */
			t = ARGF();
			i = strlen(t) + 1;
			passthrough = malloc(i);
			if (passthrough == 0) {
				Bprint(Bstderr, "cannot allocate memory for argument string\n");
				exits("malloc");
			}
			strncpy(passthrough, t, i);
			break;
		default:			/* don't know what to do for ch */
			Bprint(Bstderr, "unknown option %C\n", ARGC());
			break;
	}ARGEND;
	prologues();
	if (argc <= 0) {
		if ((bstdin = (Biobuf *)malloc(sizeof(Biobuf))) < (Biobuf *)0)
			exits("malloc");
		if (Binit(bstdin, 0, OREAD) == Beof) {
			fprint(2, "cannot Binit stdin\n");
			exits("Binit");
		}
		Bstdin = &(bstdin->Biobufhdr);
		txt2post();
	}
	for (i=0; i<argc; i++) {
		bstdin = Bopen(argv[i], 0);
		if (bstdin == 0) {
			fprint(2, "cannot open file %s\n", argv[i]);
			continue;
		}
		Bstdin = &(bstdin->Biobufhdr);
		txt2post();
	}
	finish();
	exits("");
}