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/****************************************************************

Copyright (C) Lucent Technologies 1997

All Rights Reserved

Permission to use, copy, modify, and distribute this software and

its documentation for any purpose and without fee is hereby

granted, provided that the above copyright notice appear in all

copies and that both that the copyright notice and this

permission notice and warranty disclaimer appear in supporting

documentation, and that the name Lucent Technologies or any of

its entities not be used in advertising or publicity pertaining

to distribution of the software without specific, written prior

permission.

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 ANY

SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER

IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,

ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF

THIS SOFTWARE.

****************************************************************/

const char	*version = "version 20180827";

#define DEBUG

#include <stdio.h>

#include <ctype.h>

#include <locale.h>

#include <stdlib.h>

#include <string.h>

#include <signal.h>

#include "awk.h"

#include "ytab.h"

extern	char	**environ;

extern	int	nfields;

int	dbg	= 0;

Awkfloat	srand_seed = 1;

char	*cmdname;	/* gets argv[0] for error messages */

extern	FILE	*yyin;	/* lex input file */

char	*lexprog;	/* points to program argument if it exists */

extern	int errorflag;	/* non-zero if any syntax errors; set by yyerror */

int	compile_time = 2;	/* for error printing: */

				/* 2 = cmdline, 1 = compile, 0 = running */

#define	MAX_PFILE	20	/* max number of -f's */

char	*pfile[MAX_PFILE];	/* program filenames from -f's */

int	npfile = 0;	/* number of filenames */

int	curpfile = 0;	/* current filename */

int	safe	= 0;	/* 1 => "safe" mode */

/* Can this work with recursive calls?  I don't think so.

void segvcatch(int n)

{

	FATAL("segfault.  Do you have an unbounded recursive call?", n);

}

*/

int main(int argc, char *argv[])

{

	const char *fs = NULL;

	setlocale(LC_CTYPE, "");

	setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */

	cmdname = argv[0];

	if (argc == 1) {

		fprintf(stderr, 

		  "usage: %s [-F fs] [-v var=value] [-f progfile | 'prog'] [file ...]\n", 

		  cmdname);

		exit(1);

	}

	signal(SIGFPE, fpecatch);

	/*signal(SIGSEGV, segvcatch); experiment */

	srand_seed = 1;

	srand(srand_seed);

	yyin = NULL;

	symtab = makesymtab(NSYMTAB/NSYMTAB);

	while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {

		if (strcmp(argv[1],"-version") == 0 || strcmp(argv[1],"--version") == 0) {

			printf("awk %s\n", version);

			exit(0);

			break;

		}

		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 */

			if (argv[1][2] != 0) {  /* arg is -fsomething */

				if (npfile >= MAX_PFILE - 1)

					FATAL("too many -f options"); 

				pfile[npfile++] = &argv[1][2];

			} else {		/* arg is -f something */

				argc--; argv++;

				if (argc <= 1)

					FATAL("no program filename");

				if (npfile >= MAX_PFILE - 1)

					FATAL("too many -f options"); 

				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 == NULL || *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) {  /* arg is -vsomething */

				if (isclvar(&argv[1][2]))

					setclvar(&argv[1][2]);

				else

					FATAL("invalid -v option argument: %s", &argv[1][2]);

			} else {		/* arg is -v something */

				argc--; argv++;

				if (argc <= 1)

					FATAL("no variable name");

				if (isclvar(argv[1]))

					setclvar(argv[1]);

				else

					FATAL("invalid -v option argument: %s", argv[1]);

			}

			break;

		case 'd':

			dbg = atoi(&argv[1][2]);

			if (dbg == 0)

				dbg = 1;

			printf("awk %s\n", version);

			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)

				exit(0);

			FATAL("no program given");

		}

		   dprintf( ("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 */

	   dprintf( ("argc=%d, argv[0]=%s\n", argc, argv[0]) );

	arginit(argc, argv);

	if (!safe)

		envinit(environ);

	yyparse();

	setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */

	if (fs)

		*FS = qstring(fs, '\0');

	   dprintf( ("errorflag=%d\n", errorflag) );

	if (errorflag == 0) {

		compile_time = 0;

		run(winner);

	} else

		bracecheck();

	return(errorflag);

}

int pgetc(void)		/* get 1 character from awk program */

{

	int c;

	for (;;) {

		if (yyin == NULL) {

			if (curpfile >= npfile)

				return EOF;

			if (strcmp(pfile[curpfile], "-") == 0)

				yyin = stdin;

			else if ((yyin = fopen(pfile[curpfile], "r")) == NULL)

				FATAL("can't open file %s", pfile[curpfile]);

			lineno = 1;

		}

		if ((c = getc(yyin)) != EOF)

			return c;

		if (yyin != stdin)

			fclose(yyin);

		yyin = NULL;

		curpfile++;

	}

}

char *cursource(void)	/* current source file name */

{

	if (npfile > 0)

		return pfile[curpfile];

	else

		return NULL;

}