/*	$OpenBSD: main.c,v 1.45 2020/08/11 16:57:05 millert Exp $	*/
/****************************************************************
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 20200807";

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

extern	char	**environ;
extern	int	nfields;
extern	char	*__progname;

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 */
enum compile_states	compile_time = ERROR_PRINTING;

static char	**pfile;	/* program filenames from -f's */
static size_t	maxpfile;	/* max program filename */
static size_t	npfile;		/* number of filenames */
static size_t	curpfile;	/* current filename */

bool	safe = false;		/* true => "safe" mode */
bool	do_posix = false;	/* true => POSIX mode */

static noreturn void fpecatch(int n
#ifdef SA_SIGINFO
	, siginfo_t *si, void *uc
#endif
)
{
	extern Node *curnode;
#ifdef SA_SIGINFO
	static const char *emsg[] = {
		[0] = "Unknown error",
		[FPE_INTDIV] = "Integer divide by zero",
		[FPE_INTOVF] = "Integer overflow",
		[FPE_FLTDIV] = "Floating point divide by zero",
		[FPE_FLTOVF] = "Floating point overflow",
		[FPE_FLTUND] = "Floating point underflow",
		[FPE_FLTRES] = "Floating point inexact result",
		[FPE_FLTINV] = "Invalid Floating point operation",
		[FPE_FLTSUB] = "Subscript out of range",
	};
#endif
	dprintf(STDERR_FILENO, "floating point exception%s%s\n",
#ifdef SA_SIGINFO
		": ", (size_t)si->si_code < sizeof(emsg) / sizeof(emsg[0]) &&
		emsg[si->si_code] ? emsg[si->si_code] : emsg[0]
#else
		"", ""
#endif
	    );

	if (compile_time != 2 && NR && *NR > 0) {
		dprintf(STDERR_FILENO, " input record number %d", (int) (*FNR));
		if (strcmp(*FILENAME, "-") != 0) {
			dprintf(STDERR_FILENO, ", file %s", *FILENAME);
		}
		dprintf(STDERR_FILENO, "\n");
	}
	if (compile_time != 2 && curnode) {
		dprintf(STDERR_FILENO, " source line number %d", curnode->lineno);
	} else if (compile_time != 2 && lineno) {
		dprintf(STDERR_FILENO, " source line number %d", lineno);
	}
	if (compile_time == 1 && cursource() != NULL) {
		dprintf(STDERR_FILENO, " source file %s", cursource());
	}
	dprintf(STDERR_FILENO, "\n");
	if (dbg > 1)		/* core dump if serious debugging on */
		abort();
	_exit(2);
}

static const char *
setfs(char *p)
{
	/* wart: t=>\t */
	if (p[0] == 't' && p[1] == '\0')
		return "\t";
	else if (p[0] != '\0')
		return p;
	return NULL;
}

static char *
getarg(int *argc, char ***argv, const char *msg)
{
	if ((*argv)[1][2] != '\0') {	/* arg is -fsomething */
		return &(*argv)[1][2];
	} else {			/* arg is -f something */
		(*argc)--; (*argv)++;
		if (*argc <= 1)
			FATAL("%s", msg);
		return (*argv)[1];
	}
}

int main(int argc, char *argv[])
{
	const char *fs = NULL;
	char *fn, *vn;

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

	cmdname = __progname;
	if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1) {
		fprintf(stderr, "%s: pledge: incorrect arguments\n",
		    cmdname);
		exit(1);
	}

	if (argc == 1) {
		fprintf(stderr, "usage: %s [-safe] [-V] [-d[n]] [-F fs] "
		    "[-v var=value] [prog | -f progfile]\n\tfile ...\n",
		    cmdname);
		exit(1);
	}
#ifdef SA_SIGINFO
	{
		struct sigaction sa;
		sa.sa_sigaction = fpecatch;
		sa.sa_flags = SA_SIGINFO;
		sigemptyset(&sa.sa_mask);
		(void)sigaction(SIGFPE, &sa, NULL);
	}
#else
	(void)signal(SIGFPE, fpecatch);
#endif

	do_posix = (getenv("POSIXLY_CORRECT") != NULL);

	yyin = NULL;
	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 = true;
			break;
		case 'f':	/* next argument is program filename */
			fn = getarg(&argc, &argv, "no program filename");
			if (npfile >= maxpfile) {
				maxpfile += 20;
				pfile = realloc(pfile, maxpfile * sizeof(*pfile));
				if (pfile == NULL)
					FATAL("error allocating space for -f options");
 			}
			pfile[npfile++] = fn;
 			break;
		case 'F':	/* set field separator */
			fs = setfs(getarg(&argc, &argv, "no field separator"));
			if (fs == NULL)
				WARNING("field separator FS is empty");
			break;
		case 'v':	/* -v a=1 to be done NOW.  one -v for each */
			vn = getarg(&argc, &argv, "no variable name");
			if (isclvar(vn))
				setclvar(vn);
			else
				FATAL("invalid -v option argument: %s", vn);
			break;
		case 'd':
			dbg = atoi(&argv[1][2]);
			if (dbg == 0)
				dbg = 1;
			printf("awk %s\n", version);
			break;
		case 'V':	/* added for exptools "standard" */
			printf("awk %s\n", version);
			exit(0);
			break;
		default:
			WARNING("unknown option %s ignored", argv[1]);
			break;
		}
		argc--;
		argv++;
	}

	if (safe) {
		if (pledge("stdio rpath", NULL) == -1) {
			fprintf(stderr, "%s: pledge: incorrect arguments\n",
			    cmdname);
			exit(1);
		}
	}

	/* 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 = COMPILING;
	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();
#if 0
	// Doing this would comply with POSIX, but is not compatible with
	// other awks and with what most users expect. So comment it out.
	setlocale(LC_NUMERIC, ""); /* back to whatever it is locally */
#endif
	if (fs)
		*FS = qstring(fs, '\0');
	DPRINTF("errorflag=%d\n", errorflag);
	if (errorflag == 0) {
		compile_time = RUNNING;
		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 < npfile ? curpfile : curpfile - 1];
	else
		return NULL;
}