From e37302c4b99f147f1fd85ca27a2dbd2aa7a4eb41 Mon Sep 17 00:00:00 2001
From: wkj <devnull@localhost>
Date: Wed, 21 Apr 2004 01:22:09 +0000
Subject: Plan 9 lex (to be installed as lex.9, if at all).

---
 src/cmd/lex/header.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/cmd/lex/header.c

(limited to 'src/cmd/lex/header.c')

diff --git a/src/cmd/lex/header.c b/src/cmd/lex/header.c
new file mode 100644
index 00000000..8fa63d62
--- /dev/null
+++ b/src/cmd/lex/header.c
@@ -0,0 +1,115 @@
+# include "ldefs.h"
+
+extern int nine;
+
+void
+phead1(void)
+{
+	Bprint(&fout,"typedef unsigned char Uchar;\n");
+	if (nine) {
+		Bprint(&fout,"# include <u.h>\n");
+		Bprint(&fout,"# include <libc.h>\n");
+	}
+	Bprint(&fout,"# include <stdio.h>\n");
+	Bprint(&fout, "# define U(x) x\n");
+	Bprint(&fout, "# define NLSTATE yyprevious=YYNEWLINE\n");
+	Bprint(&fout,"# define BEGIN yybgin = yysvec + 1 +\n");
+	Bprint(&fout,"# define INITIAL 0\n");
+	Bprint(&fout,"# define YYLERR yysvec\n");
+	Bprint(&fout,"# define YYSTATE (yyestate-yysvec-1)\n");
+	Bprint(&fout,"# define YYOPTIM 1\n");
+# ifdef DEBUG
+	Bprint(&fout,"# define LEXDEBUG 1\n");
+# endif
+	Bprint(&fout,"# define YYLMAX 200\n");
+	Bprint(&fout,
+"# define unput(c) {yytchar= (c);if(yytchar=='\\n')yylineno--;*yysptr++=yytchar;}\n");
+	Bprint(&fout,"# define yymore() (yymorfg=1)\n");
+	Bprint(&fout,"# define ECHO fprintf(yyout, \"%%s\",yytext)\n");
+	Bprint(&fout,"# define REJECT { nstr = yyreject(); goto yyfussy;}\n");
+	Bprint(&fout,"int yyleng; extern char yytext[];\n");
+	Bprint(&fout,"int yymorfg;\n");
+	Bprint(&fout,"extern Uchar *yysptr, yysbuf[];\n");
+	Bprint(&fout,"int yytchar;\n");
+//	Bprint(&fout,"FILE *yyin = stdin, *yyout = stdout;\n");
+	Bprint(&fout,"FILE *yyin, *yyout;\n");
+	Bprint(&fout,"extern int yylineno;\n");
+	Bprint(&fout,"struct yysvf { \n");
+	Bprint(&fout,"\tstruct yywork *yystoff;\n");
+	Bprint(&fout,"\tstruct yysvf *yyother;\n");
+	Bprint(&fout,"\tint *yystops;};\n");
+	Bprint(&fout,"struct yysvf *yyestate;\n");
+	Bprint(&fout,"extern struct yysvf yysvec[], *yybgin;\n");
+	Bprint(&fout,"int yylook(void), yywrap(void), yyback(int *, int);\n");
+	if(nine) {
+		Bprint(&fout,
+				"int infd, outfd;\n"
+				"\n"
+				"void\n"
+				"output(char c)\n"
+				"{\n"
+				"	int rv;\n"
+				"	if ((rv = write(outfd, &c, 1)) < 0)\n"
+				"		sysfatal(\"output: %%r\");\n"
+				"	if (rv == 0)\n"
+				"		sysfatal(\"output: EOF?\");\n"
+				"}\n"
+				"\n"
+				"int\n"
+				"input(void)\n"
+				"{\n"
+				"	if(yysptr > yysbuf)\n"
+				"		yytchar = U(*--yysptr);\n"
+				"	else {\n"
+				"		int rv;\n"
+				"		if ((rv = read(infd, &yytchar, 1)) < 0)\n"
+				"			sysfatal(\"input: %%r\");\n"
+				"		if (rv == 0)\n"
+				"			return 0;\n"
+				"	}\n"
+				"	if (yytchar == '\\n')\n"
+				"		yylineno++;\n"
+				"	return yytchar;\n"
+				"}\n");
+	}
+	else {
+		Bprint(&fout,"# define output(c) putc(c,yyout)\n");
+		Bprint(&fout, "%s%d%s\n",
+ 		 "# define input() (((yytchar=yysptr>yysbuf?U(*--yysptr):getc(yyin))==",
+		'\n',
+ 		"?(yylineno++,yytchar):yytchar)==EOF?0:yytchar)");
+	}
+}
+
+void
+phead2(void)
+{
+	Bprint(&fout,"while((nstr = yylook()) >= 0)\n");
+	Bprint(&fout,"yyfussy: switch(nstr){\n");
+	Bprint(&fout,"case 0:\n");
+	Bprint(&fout,"if(yywrap()) return(0); break;\n");
+}
+
+void
+ptail(void)
+{
+	if(!pflag){
+		Bprint(&fout,"case -1:\nbreak;\n");		/* for reject */
+		Bprint(&fout,"default:\n");
+		Bprint(&fout,"fprintf(yyout,\"bad switch yylook %%d\",nstr);\n");
+		Bprint(&fout,"} return(0); }\n");
+		Bprint(&fout,"/* end of yylex */\n");
+	}
+	pflag = 1;
+}
+
+void
+statistics(void)
+{
+	fprint(errorf,"%d/%d nodes(%%e), %d/%d positions(%%p), %d/%d (%%n), %ld transitions\n",
+		tptr, treesize, (int)(nxtpos-positions), maxpos, stnum+1, nstates, rcount);
+	fprint(errorf, ", %d/%d packed char classes(%%k)", (int)(pcptr-pchar), pchlen);
+	fprint(errorf,", %d/%d packed transitions(%%a)",nptr, ntrans);
+	fprint(errorf, ", %d/%d output slots(%%o)", yytop, outsize);
+	fprint(errorf,"\n");
+}
-- 
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