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AT&T awk, by B. W. Kernighan, with fixes from 4.4BSD and by me

/****************************************************************
Copyright (C) AT&T and Lucent Technologies 1996
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 names of AT&T or Lucent Technologies
or any of their entities not be used in advertising or publicity
pertaining to distribution of the software without specific,
written prior permission.

AT&T AND LUCENT DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL AT&T OR LUCENT OR ANY OF THEIR
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.
****************************************************************/

char	*version = "version May 27, 1996";

#define DEBUG
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include "awk.h"
#include "awkgram.h"

extern	char	**environ;
extern	int	nfields;

int	dbg	= 0;
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 */

char	*pfile[20];	/* program filenames from -f's */
int	npfile = 0;	/* number of filenames */
int	curpfile = 0;	/* current filename */

int main(int argc, char *argv[])
{
	char *fs = NULL, *marg;
	int temp;

	if ((cmdname = strrchr(argv[0], '/')) != NULL)
		cmdname++;
	else
		cmdname = argv[0];
	if (argc == 1) {
		fprintf(stderr, "Usage: %s [-f programfile | 'program'] [-Ffieldsep] [-v var=value] [-mf n] [-mr n] [files]\n", cmdname);
		exit(1);
	}
	gs = newGstring();	/* for lex */
	signal(SIGFPE, fpecatch);
	yyin = NULL;
	symtab = makesymtab(NSYMTAB);
	while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {
		if (strcmp((char *) argv[1], "--") == 0) {	/* explicit end of args */
			argc--;
			argv++;
			break;
		}
		switch (argv[1][1]) {
		case 'f':	/* next argument is program filename */
			argc--;
			argv++;
			if (argc <= 1)
				ERROR "no program filename" FATAL;
			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 = (char *) "\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 = (char *) "\t";
				else if (argc > 1 && argv[1][0] != 0)
					fs = &argv[1][0];
			}
			if (fs == NULL || *fs == '\0')
				ERROR "field separator FS is empty" WARNING;
			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 'm':	/* more memory: -mr=record, -mf=fields */
			marg = argv[1];
			if (argv[1][3])
				temp = atoi(&argv[1][3]);
			else {
				argv++; argc--;
				temp = atoi(&argv[1][0]);
			}
			switch (marg[2]) {
			case 'r':	recsize = temp; break;
			case 'f':	nfields = temp; break;
			default: ERROR "unknown option %s\n", marg FATAL;
			}
			break;
		case 'd':
			dbg = atoi(&argv[1][2]);
			if (dbg == 0)
				dbg = 1;
			printf("awk %s\n", version);
			break;
		default:
			ERROR "unknown option %s ignored", argv[1] WARNING;
			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);
			ERROR "no program given" FATAL;
		}
		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);
	envinit(environ);
	yyparse();
	if (fs)
		*FS = tostring(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((char *) pfile[curpfile], "-") == 0)
				yyin = stdin;
			else if ((yyin = fopen((char *) pfile[curpfile], "r")) == NULL)
				ERROR "can't open file %s", pfile[curpfile] FATAL;
		}
		if ((c = getc(yyin)) != EOF)
			return c;
		if (yyin != stdin)
			fclose(yyin);
		yyin = NULL;
		curpfile++;
	}
}