#ifndef lint
static char *RCSid = "$Id: plot.c,v 1.18.2.4 2000/05/07 16:48:37 lhecking Exp $";
#endif

/* GNUPLOT - plot.c */

/*[
 * Copyright 1986 - 1993, 1998   Thomas Williams, Colin Kelley
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <signal.h>
#include <setjmp.h>

#ifdef HAVE_SIGSETJMP
# define SETJMP(env, save_signals) sigsetjmp(env, save_signals)
# define LONGJMP(env, retval) siglongjmp(env, retval)
#else
# define SETJMP(env, save_signals) setjmp(env)
# define LONGJMP(env, retval) longjmp(env, retval)
#endif

#include "plot.h"
#include "fit.h"
#include "setshow.h"
#include "fnproto.h"

#ifdef HAVE_SYS_UTSNAME_H
# include <sys/utsname.h>
#endif

#if defined(MSDOS) || defined(DOS386) || defined(__EMX__)
# include <io.h>
#endif

/* HBB: for the control87 function, if used with DJGPP V1: */
#if defined(DJGPP) && (DJGPP!=2)
# include "ctrl87.h"
#endif

#ifdef VMS
# ifndef __GNUC__
#  include <unixio.h>
# endif
# include <smgdef.h>
extern int vms_vkid;
extern smg$create_virtual_keyboard();
extern int vms_ktid;
extern smg$create_key_table();
#endif /* VMS */

#ifdef AMIGA_SC_6_1
# include <proto/dos.h>
#endif

#ifdef _Windows
# include <windows.h>
# ifndef SIGINT
#  define SIGINT 2		/* for MSC */
# endif
#endif /* _Windows */

extern FILE *gpoutfile;

TBOOLEAN interactive = TRUE;	/* FALSE if stdin not a terminal */
TBOOLEAN noinputfiles = TRUE;	/* FALSE if there are script files */

/*  these 2 could be in misc.c, but are here with all the other globals */
TBOOLEAN do_load_arg_substitution = FALSE;
char *call_args[10] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };

char *infile_name = NULL;	/* name of command file; NULL if terminal */

#ifdef HAVE_LIBREADLINE
extern char *rl_readline_name;
extern int rl_complete_with_tilde_expansion;
extern char *rl_terminal_name;
#endif

#ifdef X11
extern int X11_args __PROTO((int, char **));
#endif

/* patch to get home dir, see command.c */
#if (defined (__TURBOC__) && (defined (MSDOS) || defined(DOS386))) || defined(DJGPP)
# include <dir.h>		/* MAXPATH */
char HelpFile[MAXPATH];
#endif /*   - DJL */

#ifndef STDOUT
# define STDOUT 1
#endif

/* a longjmp buffer to get back to the command line */
#ifdef _Windows
static jmp_buf far command_line_env;
#else
static jmp_buf command_line_env;
#endif

static void load_rcfile __PROTO((void));
RETSIGTYPE inter __PROTO((int anint));

/* built-in function table */
struct ft_entry GPFAR ft[] =
{
    /* internal functions: */
    {"push", (FUNC_PTR) f_push},
    {"pushc", (FUNC_PTR) f_pushc},
    {"pushd1", (FUNC_PTR) f_pushd1},
    {"pushd2", (FUNC_PTR) f_pushd2},
    {"pushd", (FUNC_PTR) f_pushd},
    {"call", (FUNC_PTR) f_call},
    {"calln", (FUNC_PTR) f_calln},
    {"lnot", (FUNC_PTR) f_lnot},
    {"bnot", (FUNC_PTR) f_bnot},
    {"uminus", (FUNC_PTR) f_uminus},
    {"lor", (FUNC_PTR) f_lor},
    {"land", (FUNC_PTR) f_land},
    {"bor", (FUNC_PTR) f_bor},
    {"xor", (FUNC_PTR) f_xor},
    {"band", (FUNC_PTR) f_band},
    {"eq", (FUNC_PTR) f_eq},
    {"ne", (FUNC_PTR) f_ne},
    {"gt", (FUNC_PTR) f_gt},
    {"lt", (FUNC_PTR) f_lt},
    {"ge", (FUNC_PTR) f_ge},
    {"le", (FUNC_PTR) f_le},
    {"plus", (FUNC_PTR) f_plus},
    {"minus", (FUNC_PTR) f_minus},
    {"mult", (FUNC_PTR) f_mult},
    {"div", (FUNC_PTR) f_div},
    {"mod", (FUNC_PTR) f_mod},
    {"power", (FUNC_PTR) f_power},
    {"factorial", (FUNC_PTR) f_factorial},
    {"bool", (FUNC_PTR) f_bool},
    {"dollars", (FUNC_PTR) f_dollars},	/* for using extension */
    {"jump", (FUNC_PTR) f_jump},
    {"jumpz", (FUNC_PTR) f_jumpz},
    {"jumpnz", (FUNC_PTR) f_jumpnz},
    {"jtern", (FUNC_PTR) f_jtern},

/* standard functions: */
    {"real", (FUNC_PTR) f_real},
    {"imag", (FUNC_PTR) f_imag},
    {"arg", (FUNC_PTR) f_arg},
    {"conjg", (FUNC_PTR) f_conjg},
    {"sin", (FUNC_PTR) f_sin},
    {"cos", (FUNC_PTR) f_cos},
    {"tan", (FUNC_PTR) f_tan},
    {"asin", (FUNC_PTR) f_asin},
    {"acos", (FUNC_PTR) f_acos},
    {"atan", (FUNC_PTR) f_atan},
    {"atan2", (FUNC_PTR) f_atan2},
    {"sinh", (FUNC_PTR) f_sinh},
    {"cosh", (FUNC_PTR) f_cosh},
    {"tanh", (FUNC_PTR) f_tanh},
    {"int", (FUNC_PTR) f_int},
    {"abs", (FUNC_PTR) f_abs},
    {"sgn", (FUNC_PTR) f_sgn},
    {"sqrt", (FUNC_PTR) f_sqrt},
    {"exp", (FUNC_PTR) f_exp},
    {"log10", (FUNC_PTR) f_log10},
    {"log", (FUNC_PTR) f_log},
    {"besj0", (FUNC_PTR) f_besj0},
    {"besj1", (FUNC_PTR) f_besj1},
    {"besy0", (FUNC_PTR) f_besy0},
    {"besy1", (FUNC_PTR) f_besy1},
    {"erf", (FUNC_PTR) f_erf},
    {"erfc", (FUNC_PTR) f_erfc},
    {"gamma", (FUNC_PTR) f_gamma},
    {"lgamma", (FUNC_PTR) f_lgamma},
    {"ibeta", (FUNC_PTR) f_ibeta},
    {"igamma", (FUNC_PTR) f_igamma},
    {"rand", (FUNC_PTR) f_rand},
    {"floor", (FUNC_PTR) f_floor},
    {"ceil", (FUNC_PTR) f_ceil},

    {"norm", (FUNC_PTR) f_normal},	/* XXX-JG */
    {"inverf", (FUNC_PTR) f_inverse_erf},	/* XXX-JG */
    {"invnorm", (FUNC_PTR) f_inverse_normal},	/* XXX-JG */
    {"asinh", (FUNC_PTR) f_asinh},
    {"acosh", (FUNC_PTR) f_acosh},
    {"atanh", (FUNC_PTR) f_atanh},

    {"column", (FUNC_PTR) f_column},	/* for using */
    {"valid", (FUNC_PTR) f_valid},	/* for using */
    {"timecolumn", (FUNC_PTR) f_timecolumn},	/* for using */

    {"tm_sec", (FUNC_PTR) f_tmsec},	/* for timeseries */
    {"tm_min", (FUNC_PTR) f_tmmin},	/* for timeseries */
    {"tm_hour", (FUNC_PTR) f_tmhour},	/* for timeseries */
    {"tm_mday", (FUNC_PTR) f_tmmday},	/* for timeseries */
    {"tm_mon", (FUNC_PTR) f_tmmon},	/* for timeseries */
    {"tm_year", (FUNC_PTR) f_tmyear},	/* for timeseries */
    {"tm_wday", (FUNC_PTR) f_tmwday},	/* for timeseries */
    {"tm_yday", (FUNC_PTR) f_tmyday},	/* for timeseries */

    {NULL, NULL}
};

static struct udvt_entry udv_pi = { NULL, "pi", FALSE };
/* first in linked list */
struct udvt_entry *first_udv = &udv_pi;
struct udft_entry *first_udf = NULL;

static int exit_status = EXIT_SUCCESS;

#ifdef OS2
# define INCL_DOS
# define INCL_REXXSAA
# include <os2.h>
# include <process.h>
ULONG RexxInterface(PRXSTRING, PUSHORT, PRXSTRING);
int ExecuteMacro(char *, int);
void PM_intc_cleanup();
void PM_setup();
#endif /* OS2 */

#if defined(ATARI) || defined(MTOS)
/* For findfile () (?) */
# include <support.h>
void appl_exit(void);
void MTOS_open_pipe(void);
extern int aesid;
#endif

RETSIGTYPE inter(anint)
int anint;
{
#ifdef OS2
    (void) signal(anint, SIG_ACK);
#else
    (void) signal(SIGINT, (sigfunc) inter);
#endif

#ifndef DOSX286
    (void) signal(SIGFPE, SIG_DFL);	/* turn off FPE trapping */
#endif
#ifdef OS2
    PM_intc_cleanup();
#else
    term_reset();
    (void) putc('\n', stderr);
    LONGJMP(command_line_env, TRUE);	/* return to prompt */
#endif
}

#ifdef LINUXVGA
/* utility functions to ensure that setuid gnuplot
 * assumes root privileges only for those parts
 * of the code which require root rights.
 *
 * By "Dr. Werner Fink" <werner@suse.de>
 */
static uid_t euid, ruid;
static gid_t egid, rgid;
static int asked_privi = 0;

void
drop_privilege()
{
    if (!asked_privi) {
	euid = geteuid();
	egid = getegid();
	ruid = getuid();
	rgid = getgid();
	asked_privi = 1;
    }
    if (setegid(rgid) == -1)
	(void) fprintf(stderr, "setegid(%d): %s\n",
		       (int) rgid, strerror(errno));
    if (seteuid(ruid) == -1)
	(void) fprintf(stderr, "seteuid(%d): %s\n",
		       (int) ruid, strerror(errno));
}

void
take_privilege()
{
    if (!asked_privi) {
	euid = geteuid();
	egid = getegid();
	ruid = getuid();
	rgid = getgid();
	asked_privi = 1;
    }
    if (setegid(egid) == -1)
	(void) fprintf(stderr, "setegid(%d): %s\n",
		       (int) egid, strerror(errno));
    if (seteuid(euid) == -1)
	(void) fprintf(stderr, "seteuid(%d): %s\n",
		       (int) euid, strerror(errno));
}
#endif /* LINUXVGA */


/* a wrapper for longjmp so we can keep everything local */
void bail_to_command_line()
{
    LONGJMP(command_line_env, TRUE);
}

#if defined(_Windows) || defined(_Macintosh)
int gnu_main(argc, argv)
#else
int main(argc, argv)
#endif
int argc;
char **argv;
{
#ifdef LINUXVGA
    LINUX_setup();
#endif
/* make sure that we really have revoked root access, this might happen if
   gnuplot is compiled without vga support but is installed suid by mistake */
#ifdef __linux__
    setuid(getuid());
#endif
#if defined(MSDOS) && !defined(_Windows) && !defined(__GNUC__)
    PC_setup();
#endif /* MSDOS !Windows */
/* HBB: Seems this isn't needed any more for DJGPP V2? */
/* HBB: disable all floating point exceptions, just keep running... */
#if defined(DJGPP) && (DJGPP!=2)
    _control87(MCW_EM, MCW_EM);
#endif

#if defined(OS2)
    int rc;
    if (_osmode == OS2_MODE) {
	PM_setup();
	rc = RexxRegisterSubcomExe("GNUPLOT", (PFN) RexxInterface, NULL);
    }
#endif

/* malloc large blocks, otherwise problems with fragmented mem */
#ifdef OSK
    _mallocmin(102400);
#endif

#ifdef MALLOCDEBUG
    malloc_debug(7);
#endif

/* get helpfile from home directory */
#ifndef DOSX286
# ifndef _Windows
#  if defined (__TURBOC__) && (defined (MSDOS) || defined(DOS386))
    strcpy(HelpFile, argv[0]);
    strcpy(strrchr(HelpFile, DIRSEP1), "\\gnuplot.gih");
#  endif			/*   - DJL */
# endif				/* !_Windows */
#endif /* !DOSX286 */
#ifdef __DJGPP__
    {
	char *s;
	strcpy(HelpFile, argv[0]);
	for (s = HelpFile; *s; s++)
	    if (*s == DIRSEP1)
		*s = DIRSEP2;	/* '\\' to '/' */
	strcpy(strrchr(HelpFile, DIRSEP2), "/gnuplot.gih");
    }		/* Add also some "paranoid" tests for '\\':  AP */
#endif /* DJGPP */

#ifdef VMS
    unsigned int status[2] = { 1, 0 };
#endif

#ifdef HAVE_LIBREADLINE
    rl_readline_name = argv[0];
    rl_complete_with_tilde_expansion = 1;
    rl_terminal_name = getenv("TERM");
#endif

#ifdef X11
    {
	int n = X11_args(argc, argv);
	argv += n;
	argc -= n;
    }
#endif

#ifdef apollo
    apollo_pfm_catch();
#endif

/* moved to ATARI_init in atariaes.trm */
/* #ifdef ATARI
   void application_init(void);
   application_init();
   #endif */

#ifdef MTOS
    MTOS_open_pipe();
#endif

    setbuf(stderr, (char *) NULL);

#ifndef NO_SETVBUF
    /* this was once setlinebuf(). Docs say this is
     * identical to setvbuf(,NULL,_IOLBF,0), but MS C
     * faults this (size out of range), so we try with
     * size of 1024 instead. [SAS/C does that, too. -lh]
     * Failing this, I propose we just make the call and
     * ignore the return : its probably not a big deal
     */
    if (setvbuf(stdout, (char *) NULL, _IOLBF, (size_t) 1024) != 0)
	fputs("Could not linebuffer stdout\n", stderr);
#endif

    gpoutfile = stdout;
    (void) Gcomplex(&udv_pi.udv_value, Pi, 0.0);

    init_memory();

    interactive = FALSE;
    init_terminal();		/* can set term type if it likes */

#ifdef AMIGA_SC_6_1
    if (IsInteractive(Input()) == DOSTRUE)
	interactive = TRUE;
    else
	interactive = FALSE;
#else
# if (defined(__MSC__) && defined(_Windows)) || defined(__WIN32__)
    interactive = TRUE;
# else
    interactive = isatty(fileno(stdin));
# endif
#endif /* !AMIGA_SC_6_1 */

    if (argc > 1)
	interactive = noinputfiles = FALSE;
    else
	noinputfiles = TRUE;

    /* Need this before show_version is called for the first time */

#ifdef HAVE_SYS_UTSNAME_H
    {
	struct utsname uts;

	/* something is fundamentally wrong if this fails ... */
	if (uname(&uts) > -1) {
# ifdef _AIX
	    strcpy(os_name, uts.sysname);
	    sprintf(os_name, "%s.%s", uts.version, uts.release);
# elif defined(SCO)
	    strcpy(os_name, "SCO");
	    strcpy(os_rel, uts.release);
# else
	    strcpy(os_name, uts.sysname);
	    strcpy(os_rel, uts.release);
# endif
	}
    }
#else /* ! HAVE_SYS_UTSNAME_H */

    strcpy(os_name, OS);
    strcpy(os_rel, "");

#endif /* HAVE_SYS_UTSNAME_H */

    if (interactive)
	show_version(stderr);

#ifdef VMS
    /* initialise screen management routines for command recall */
    if (status[1] = smg$create_virtual_keyboard(&vms_vkid) != SS$_NORMAL)
	done(status[1]);
    if (status[1] = smg$create_key_table(&vms_ktid) != SS$_NORMAL)
	done(status[1]);
#endif /* VMS */

    if (!SETJMP(command_line_env, 1)) {
	/* first time */
	interrupt_setup();
	load_rcfile();
	init_fit();		/* Initialization of fitting module */

	if (interactive && term != 0)	/* not unknown */
	    fprintf(stderr, "\nTerminal type set to '%s'\n", term->name);
    } else {
	/* come back here from int_error() */
	if (interactive == FALSE)
	    exit_status = EXIT_FAILURE;

#ifdef AMIGA_SC_6_1
	(void) rawcon(0);
#endif
	load_file_error();	/* if we were in load_file(), cleanup */
#ifdef _Windows
	SetCursor(LoadCursor((HINSTANCE) NULL, IDC_ARROW));
#endif

#ifdef VMS
	/* after catching interrupt */
	/* VAX stuffs up stdout on SIGINT while writing to stdout,
	   so reopen stdout. */
	if (gpoutfile == stdout) {
	    if ((stdout = freopen("SYS$OUTPUT", "w", stdout)) == NULL) {
		/* couldn't reopen it so try opening it instead */
		if ((stdout = fopen("SYS$OUTPUT", "w")) == NULL) {
		    /* don't use int_error here - causes infinite loop! */
		    fputs("Error opening SYS$OUTPUT as stdout\n", stderr);
		}
	    }
	    gpoutfile = stdout;
	}
#endif /* VMS */
	if (!interactive && !noinputfiles) {
	    term_reset();
#if defined(ATARI) || defined(MTOS)
	    if (aesid > -1)
		atexit(appl_exit);
#endif
	    return (IO_ERROR);	/* exit on non-interactive error */
	}
    }

    if (argc > 1) {
#ifdef _Windows
	int noend = 0;
#endif

	/* load filenames given as arguments */
	while (--argc > 0) {
	    ++argv;
	    c_token = NO_CARET;	/* in case of file not found */
#ifdef _Windows
	    if (stricmp(*argv, "-noend") == 0 || stricmp(*argv, "/noend") == 0)
		noend = 1;
	    else
#endif
	    if (strcmp(*argv, "-") == 0) {
		/* DBT 10-7-98  go interactive if "-" on command line */

		interactive = TRUE;
		/* will this work on all platforms? */

		while (!com_line());

		/* interactive = FALSE; */ /* should this be here? */

	    } else
		load_file(fopen(*argv, "r"), *argv, FALSE);
	}
#ifdef _Windows
	if (noend) {
	    interactive = TRUE;
	    while (!com_line());
	}
#endif
    } else {
	/* take commands from stdin */
	while (!com_line());
    }

    term_reset();

#ifdef OS2
    if (_osmode == OS2_MODE)
	RexxDeregisterSubcom("GNUPLOT", NULL);
#endif

#if defined(ATARI) || defined(MTOS)
    if (aesid > -1)
	atexit(appl_exit);
#endif
    return (exit_status);
}

#if (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)
int purec_matherr(struct exception *e)
{
    char *c;
    switch (e->type) {
    case DOMAIN:
	c = "domain error";
	break;
    case SING:
	c = "argument singularity";
	break;
    case OVERFLOW:
	c = "overflow range";
	break;
    case UNDERFLOW:
	c = "underflow range";
	break;
    default:
	c = "(unknown error";
	break;
    }
    fprintf(stderr, "\
math exception : %s\n\
    name : %s\n\
    arg 1: %e\n\
    arg 2: %e\n\
    ret  : %e\n",
	    c,
	    e->name,
	    e->arg1,
	    e->arg2,
	    e->retval);

    return 1;
}
#endif /* (ATARI || MTOS) && PUREC */


/* Set up to catch interrupts */
void interrupt_setup()
{
#ifdef __PUREC__
    setmatherr(purec_matherr);
#endif

    (void) signal(SIGINT, (sigfunc) inter);

#ifdef SIGPIPE
    /* ignore pipe errors, this might happen with set output "|head" */
    (void) signal(SIGPIPE, SIG_IGN);
#endif /* SIGPIPE */
}


/* Look for a gnuplot init file in . or home directory */
static void load_rcfile()
{
    FILE *plotrc = NULL;
    char home[80];
    char rcfile[sizeof(PLOTRC) + 80];
    char *tmp_home = NULL;
#ifndef VMS
    char *p;	/* points to last char in home path, or to \0, if none */

    tmp_home = getenv(HOME);
    if (tmp_home) {
	safe_strncpy(home, tmp_home, sizeof(home));
	if (strlen(home))
	    p = &home[strlen(home) - 1];
	else
	    p = home;
	if ((*p != DIRSEP1) && (*p != DIRSEP2) && (*p != NUL)) {
	    assert(p >= home && p <= (home + sizeof(home) - 1 - 2));
	    if (*p)
		p++;
	    *p++ = DIRSEP1;
	    *p = NUL;
	}
    }
#else /* VMS */
    safe_strncpy(home, HOME, sizeof(home));
    tmp_home = home;
#endif /* VMS */

#ifdef NOCWDRC
    /* inhibit check of init file in current directory for security reasons */
#else
    (void) strcpy(rcfile, PLOTRC);
    plotrc = fopen(rcfile, "r");
#endif /* !NOCWDRC */

    if (plotrc == NULL) {
	if (tmp_home) {
	    (void) sprintf(rcfile, "%s%s", home, PLOTRC);
	    plotrc = fopen(rcfile, "r");
#if defined(ATARI) || defined(MTOS)
	    if (plotrc == NULL) {
		char const *const ext[] = { NULL };
		char *ini_ptr = findfile(PLOTRC, getenv("GNUPLOTPATH"), ext);

		if (ini_ptr)
		    plotrc = fopen(ini_ptr, "r");
	    }
#endif /* ATARI || MTOS */
	}
    }
    if (plotrc)
	load_file(plotrc, rcfile, FALSE);
}

#ifdef OS2

int ExecuteMacro(char *argv, int namelength)
{
    RXSTRING rxRc;
    RXSTRING rxArg;
    char pszName[CCHMAXPATH];
    short sRc;
    int rc;

    safe_strncpy(pszName, argv, sizeof(pszName));
    MAKERXSTRING(rxArg, argv, strlen(argv));
    rc = RexxStart(1,
		   &rxArg,
		   pszName,
		   NULL,
		   "GNUPLOT",
		   RXCOMMAND,
		   NULL,
		   &sRc,
		   &rxRc);
    if (rc == -4)
	rc = 0;			/* run was cancelled-don't give error message */

/* We don't use this value ?
   BTW, don't use free() instead since it's allocated inside RexxStart() */
    DosFreeMem(rxRc.strptr);
    return rc;
}

ULONG RexxInterface(PRXSTRING rxCmd, PUSHORT pusErr, PRXSTRING rxRc)
/*
   ** Rexx command line interface
 */
{
    int rc;
    static jmp_buf keepenv;
    int cmdlen;

    memcpy(keepenv, command_line_env, sizeof(jmp_buf));
    if (!SETJMP(command_line_env, 1)) {
	/* set variable input_line.
	 * Watch out for line length of NOT_ZERO_TERMINATED strings ! */
	cmdlen = rxCmd->strlength + 1;
	safe_strncpy(input_line, rxCmd->strptr, cmdlen);
	input_line[cmdlen] = NUL;

	rc = do_line();
	*pusErr = RXSUBCOM_OK;
	rxRc->strptr[0] = rc + '0';
	rxRc->strptr[1] = NUL;
	rxRc->strlength = strlen(rxRc->strptr);
    } else {
	*pusErr = RXSUBCOM_ERROR;
	RexxSetHalt(getpid(), 1);
    }
    memcpy(command_line_env, keepenv, sizeof(jmp_buf));
    return 0;
}
#endif