File: plot.c

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#ifndef lint
static char *RCSid = "$Id: plot.c,v 1.87 1998/04/14 00:16:05 drd 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.
]*/

#include <signal.h>

#include "plot.h"
#include "fit.h"
#include "setshow.h"
#include "fnproto.h"
#include <setjmp.h>

#if defined(MSDOS) || defined(DOS386)
#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

extern FILE *outfile;

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 GNU_READLINE
extern char* rl_readline_name;
extern int rl_complete_with_tilde_expansion;
#endif

#if defined(__TURBOC__) && (defined(MSDOS) || defined(DOS386))  /* patch to get home dir, see command.c */
char HelpFile[80] ;
#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));

struct ft_entry GPFAR ft[] = {	/* built-in function table */

/* 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;



#ifdef VMS
#define HOME "sys$login:"
#else /* VMS */

#if defined(MSDOS) ||  defined(AMIGA_AC_5) || defined(AMIGA_SC_6_1) || defined(ATARI) || defined(OS2) || defined(_Windows) || defined(DOS386)

#define HOME "GNUPLOT"

#else /* MSDOS || AMIGA_AC/SC || ATARI || OS2 || _Windows || defined(DOS386)*/

#define HOME "HOME"

#endif /* MSDOS || AMIGA_AC/SC || ATARI || OS2 || _Windows || defined(DOS386)*/
#endif /* VMS */

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

#if defined(unix) || defined(AMIGA) || defined(OSK)
#define PLOTRC ".gnuplot"
#else /* AMIGA || unix || OSK */
#define PLOTRC "gnuplot.ini"
#endif /* AMIGA || unix || OSK */

#if defined(ATARI) || defined(MTOS)
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
}


/* 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? */
#if defined(DJGPP) && (DJGPP!=2)       /* HBB: disable all floating point exceptions, just keep running... */
  _control87(MCW_EM, MCW_EM); 
#endif

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

#ifdef OSK	/* malloc large blocks, otherwise problems with fragmented mem */
   _mallocmin (102400);
#endif
	
#ifdef MALLOCDEBUG
malloc_debug(7);
#endif

#ifndef DOSX286
#ifndef _Windows
#if defined (__TURBOC__) && (defined (MSDOS) || defined(DOS386))
strcpy (HelpFile,argv[0]) ;                       /* got helpfile from */
strcpy (strrchr(HelpFile,'\\'),"\\gnuplot.gih") ; /* home directory    */
                                                  /*   - DJL */
#endif
#endif
#endif

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

#ifdef GNU_READLINE
rl_readline_name = argv[0];
rl_complete_with_tilde_expansion = 1;
#endif

#ifdef X11
     { extern int X11_args __PROTO((int argc, char *argv[]));
       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.
	 * 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)
	    fprintf (stderr, "Could not linebuffer stdout\n");
#endif

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

     if (interactive)
	  show_version();
#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)) {
	    /* 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() */
#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 (outfile == 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! */
				 fprintf(stderr,"Error opening SYS$OUTPUT as stdout\n");
			  }
		   }
		   outfile = 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
			  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(IO_SUCCESS);
}

#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", c);
	fprintf(stderr, "    name : %s\n", e->name);
	fprintf(stderr, "    arg 1: %e\n", e->arg1);
	fprintf(stderr, "    arg 2: %e\n", e->arg2);
	fprintf(stderr, "    ret  : %e\n", 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);

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


/* Look for a gnuplot start-up file */
static void load_rcfile()
{
    register FILE *plotrc;
    char home[80]; 
    char rcfile[sizeof(PLOTRC)+80];
#if defined(ATARI) || defined(MTOS)
    #include <support.h> 
    char *ini_ptr;
    char const *const ext[] = {NULL};
#endif
    /* Look for a gnuplot init file in . or home directory */
#ifdef VMS
    (void) strcpy(home,HOME);
#else /* VMS */
    char *tmp_home=getenv(HOME);
    char *p;	/* points to last char in home path, or to \0, if none */
    char c='\0';/* character that should be added, or \0, if none */

    if(tmp_home) {
    	strcpy(home,tmp_home);
	if( strlen(home) ) p = &home[strlen(home)-1];
	else		   p = home;
#if defined(MSDOS) || defined(ATARI) || defined( OS2 ) || defined(_Windows) || defined(DOS386)
	if( *p!='\\' && *p!='\0' ) c='\\';
#else
#if defined(MTOS)
	if( *p!='\\' && *p!='/' && *p!='\0' ) c='\\';
#else
#if defined(AMIGA_AC_5)
	if( *p!='/' && *p!=':' && *p!='\0' ) c='/';
#else /* that leaves unix and OSK */
	c='/';
#endif
#endif
#endif
	if(c) {
	    if(*p) p++;
	    *p++=c;
	    *p='\0';
	}
    }
#endif /* VMS */

#ifdef NOCWDRC
    /* inhibit check of init file in current directory for security reasons */
    {
#else
    (void) strcpy(rcfile, PLOTRC);
    plotrc = fopen(rcfile,"r");
    if (plotrc == (FILE *)NULL) {
#endif
#ifndef VMS
	if( tmp_home ) {
#endif
	   (void) sprintf(rcfile, "%s%s", home, PLOTRC);
	   plotrc = fopen(rcfile,"r");
#if defined(ATARI) || defined(MTOS)
	}
	if (plotrc == (FILE *)NULL) {
	   ini_ptr = findfile(PLOTRC,getenv("GNUPLOTPATH"),ext);
	   if (ini_ptr)  plotrc = fopen(ini_ptr,"r");
        }
#endif /* ATARI || MTOS */
#if !defined(VMS) && !defined(ATARI) && !defined(MTOS)
	} else
	   plotrc=NULL;
#endif /* !VMS && !ATARI && !MTOS */
    }
    if (plotrc)
	 load_file(plotrc, rcfile, FALSE);
}

#ifdef OS2
int ExecuteMacro( char *argv, int namelength ) 
    {
    RXSTRING rxRc ;
    RXSTRING rxArg ;
    char pszRc[256] ;
    char pszName[256] ;
    short sRc ;
    HAB hab ;
    int rc ;
    
    strncpy( pszName, argv, namelength ) ;
    pszName[namelength]='\0';
    MAKERXSTRING( rxRc, pszRc, 256 ) ;
    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*/ 
    return rc ;
    }

ULONG RexxInterface( PRXSTRING rxCmd, PUSHORT pusErr, PRXSTRING rxRc ) 
/*
** Rexx command line interface
*/
    {
    int iCmd ;
    int rc ;
    static jmp_buf keepenv;
    memcpy( keepenv, env, sizeof(jmp_buf)) ;
  if (!setjmp(command_line_env)) {
    set_input_line( rxCmd->strptr, rxCmd->strlength ) ;
    rc = do_line() ;
    *pusErr = RXSUBCOM_OK ;
    rxRc->strptr[0] = rc + '0' ;
    rxRc->strptr[1] = '\0' ;
    rxRc->strlength = strlen( rxRc->strptr ) ;    
  } else {
    *pusErr = RXSUBCOM_ERROR ;
    RexxSetHalt( getpid(), 1 ) ;
  }
    memcpy( env, keepenv, sizeof(jmp_buf)) ;
    return 0 ;    
    }
#endif