/****************************************************************Copyright (C) Lucent Technologies 1997All Rights Reserved Permission to use, copy, modify, and distribute this software andits documentation for any purpose and without fee is herebygranted, provided that the above copyright notice appear in allcopies and that both that the copyright notice and thispermission notice and warranty disclaimer appear in supportingdocumentation, and that the name Lucent Technologies or any ofits entities not be used in advertising or publicity pertainingto distribution of the software without specific, written priorpermission. LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANYSPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGESWHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHERIN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OFTHIS SOFTWARE.****************************************************************/ #include <u.h>#include <libc.h>#include <bio.h>#include "awk.h"#include "y.tab.h" extern	int	nfields; Biobuf stdin;Biobuf stdout;Biobuf stderr; int	dbg	= 0;Awkfloat	srand_seed = 1;char	*cmdname;	/* gets argv[0] for error messages */extern	Biobuf	*yyin;	/* lex input file */char	*lexprog;	/* points to program argument if it exists */int	compile_time = 2;	/* for error printing: */				/* 2 = cmdline, 1 = compile, 0 = running */ char	*pfile[20];	/* program filenames from -f's */int	npfile = 0;	/* number of filenames */int	curpfile = 0;	/* current filename */ int	safe	= 0;	/* 1 => "safe" mode */ void main(int argc, char *argv[]){	char *fs = nil; 	setfcr(getfcr() & ~FPINVAL); 	Binit(&stdin, 0, OREAD);	Binit(&stdout, 1, OWRITE);	Binit(&stderr, 2, OWRITE); 	cmdname = argv[0];	if (argc == 1) {		Bprint(&stderr, "usage: %s [-F fieldsep] [-d] [-mf n] [-mr n] [-safe] [-v var=value] [-f programfile | 'program'] [file ...]\n", cmdname);		exits("usage");	} 	atnotify(handler, 1);	srand((unsigned long) srand_seed);	yyin = nil;	symtab = makesymtab(NSYMTAB);	while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {		if (strcmp(argv[1], "--") == 0) {	/* explicit end of args */			argc--;			argv++;			break;		}		switch (argv[1][1]) {		case 's':			if (strcmp(argv[1], "-safe") == 0)				safe = 1;			break;		case 'f':	/* next argument is program filename */			argc--;			argv++;			if (argc <= 1)				FATAL("no program filename");			pfile[npfile++] = argv[1];			break;		case 'F':	/* set field separator */			if (argv[1][2] != 0) {	/* arg is -Fsomething */				if (argv[1][2] == 't' && argv[1][3] == 0)	/* wart: t=>\t */					fs = "\t";				else if (argv[1][2] != 0)					fs = &argv[1][2];			} else {		/* arg is -F something */				argc--; argv++;				if (argc > 1 && argv[1][0] == 't' && argv[1][1] == 0)	/* wart: t=>\t */					fs = "\t";				else if (argc > 1 && argv[1][0] != 0)					fs = &argv[1][0];			}			if (fs == nil || *fs == '\0')				WARNING("field separator FS is empty");			break;		case 'v':	/* -v a=1 to be done NOW.  one -v for each */			if (argv[1][2] == '\0' && --argc > 1 && isclvar((++argv)[1]))				setclvar(argv[1]);			break;		case 'd':			dbg = atoi(&argv[1][2]);			if (dbg == 0)				dbg = 1;			break;		default:			WARNING("unknown option %s ignored", argv[1]);			break;		}		argc--;		argv++;	}	/* argv[1] is now the first argument */	if (npfile == 0) {	/* no -f; first argument is program */		if (argc <= 1) {			if (dbg)				exits(0);			FATAL("no program given");		}		   dprint( ("program = |%s|\n", argv[1]) );		lexprog = argv[1];		argc--;		argv++;	}	recinit(recsize);	syminit();	compile_time = 1;	argv[0] = cmdname;	/* put prog name at front of arglist */	   dprint( ("argc=%d, argv[0]=%s\n", argc, argv[0]) );	arginit(argc, argv);	quotefmtinstall();	yyparse();	if (fs)		*FS = qstring(fs, '\0');	   dprint( ("exitstatus=%s\n", exitstatus) );	if (exitstatus == nil) {		compile_time = 0;		run(winner);	} else		bracecheck();	exits(exitstatus);} int pgetc(void)		/* get 1 character from awk program */{	int c; 	for (;;) {		if (yyin == nil) {			if (curpfile >= npfile)				return Beof;			if (strcmp(pfile[curpfile], "-") == 0)				yyin = &stdin;			else if ((yyin = Bopen(pfile[curpfile], OREAD)) == nil)				FATAL("can't open file %s", pfile[curpfile]);			lineno = 1;		}		if ((c = Bgetc(yyin)) != Beof)			return c;		if (yyin != &stdin)			Bterm(yyin);		yyin = nil;		curpfile++;	}} char *cursource(void)	/* current source file name */{	if (npfile > 0)		return pfile[curpfile];	else		return nil;}