/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
│vi: set et ft=c ts=8 tw=8 fenc=utf-8                                       :vi│
╚──────────────────────────────────────────────────────────────────────────────╝
│                                                                              │
│ 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.                                                               │
│                                                                              │
╚─────────────────────────────────────────────────────────────────────────────*/
#define DEBUG
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/ucontext.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/sock/struct/sockaddr.internal.h"
#include "libc/stdio/rand.h"
#include "libc/str/locale.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sicode.h"
#include "third_party/awk/awk.h"
#include "tool/args/args.h"
// clang-format off

const char	*version = "version 20220530";
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 */
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 */

static wontreturn void fpecatch(int n, siginfo_t *si, ucontext_t *uc)
{
	const char *emsg[10];
        emsg[0] = "Unknown error";
        emsg[FPE_INTDIV] = "Integer divide by zero";
        emsg[FPE_INTOVF] = "Integer overflow";
        emsg[FPE_FLTDIV] = "Floating point divide by zero";
        emsg[FPE_FLTOVF] = "Floating point overflow";
        emsg[FPE_FLTUND] = "Floating point underflow";
        emsg[FPE_FLTRES] = "Floating point inexact result";
        emsg[FPE_FLTINV] = "Invalid Floating point operation";
        emsg[FPE_FLTSUB] = "Subscript out of range";
	FATAL("floating point exception: %s",
              (size_t)si->si_code < sizeof(emsg) / sizeof(emsg[0]) &&
              emsg[si->si_code] ? emsg[si->si_code] : emsg[0]);
}

/* 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);
}
*/

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

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;
	struct sigaction sa;
	char *fn, *vn;

	LoadZipArgs(&argc, &argv);

	setlocale(LC_CTYPE, "");
	setlocale(LC_NUMERIC, "C"); /* for parsing cmdline & prog */
	cmdname = argv[0];

	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 [-F fs] [-v var=value] [-f progfile | 'prog'] [file ...]\n",
		  cmdname);
		exit(1);
	}

	sa.sa_sigaction = fpecatch;
	sa.sa_flags = SA_SIGINFO;
	sigemptyset(&sa.sa_mask);
	(void)sigaction(SIGFPE, &sa, NULL);

	/* Set and keep track of the random seed */
	srand_seed = 1;
	srandom((unsigned long) 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);
			return 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 = (char **) 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"));
			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;
		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 = 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 (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;
}