gnuplot/src/plot.c at 5.5 · gnuplot/gnuplot · GitHub

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/* GNUPLOT - plot.c */

/*[

* 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 "syscfg.h"

#include "plot.h"

#include "alloc.h"

#include "command.h"

#include "eval.h"

#include "fit.h"

#include "gp_hist.h"

#include "misc.h"

#include "readline.h"

#include "setshow.h"

#include "term_api.h"

#include "util.h"

#include "variable.h"

#include "version.h"

#include "voxelgrid.h"

#include "encoding.h"

#include "xdg.h"

#include <signal.h>

#include <setjmp.h>

#ifdef OS2

# define INCL_REXXSAA

# include <os2.h>

#endif /* OS2 */

#if defined(MSDOS) || defined(__EMX__) || (defined(WGP_CONSOLE) && defined(MSVC))

# include <io.h>

#endif

#ifdef VMS

# include "vms.h"

# ifndef __GNUC__

# include <unixio.h>

# endif

# include <smgdef.h>

# include <ssdef.h>

extern smg$create_virtual_keyboard();

extern smg$create_key_table();

#endif /* VMS */

#ifdef _WIN32

# include <windows.h>

# include "win/winmain.h"

# include "win/wcommon.h"

# include <io.h> // for isatty

#endif /* _WIN32 */

/* GNU readline

* Only required by two files directly,

* so I don't put this into a header file. -lh

#if defined(HAVE_LIBREADLINE) && !defined(MISSING_RL_TILDE_EXPANSION)

# include <readline/tilde.h>

extern int rl_complete_with_tilde_expansion;

#endif

/* BSD editline

#ifdef HAVE_LIBEDITLINE

# include <editline/readline.h>

#endif

/* enable gnuplot history with readline */

#ifdef GNUPLOT_HISTORY

# ifndef GNUPLOT_HISTORY_FILE

# define GNUPLOT_HISTORY_FILE "~/.gnuplot_history"

# endif

* expanded_history_filename points to the value from 'tilde_expand()',

* which expands '~' to the user's home directory, or $HOME.

* Depending on your OS you have to make sure that the "$HOME" environment

* variable exists. You are responsible for valid values.

static char *expanded_history_filename;

static void wrapper_for_write_history(void);

#endif /* GNUPLOT_HISTORY */

TBOOLEAN interactive = TRUE; /* FALSE if stdin not a terminal */

TBOOLEAN noinputfiles = TRUE; /* FALSE if there are script files */

TBOOLEAN reading_from_dash=FALSE; /* True if processing "-" as an input file */

TBOOLEAN skip_gnuplotrc = FALSE; /* skip system gnuplotrc and ~/.gnuplot */

TBOOLEAN persist_cl = FALSE; /* --persist command line option */

TBOOLEAN slow_font_startup = FALSE; /* --slow command line option */

/* user home directory */

static const char *user_homedir = NULL;

/* user shell */

const char *user_shell = NULL;

/* not static because unset.c refers to it when in debugging mode */

TBOOLEAN successful_initialization = FALSE;

#ifdef X11

extern int X11_args(int, char **); /* FIXME: defined in term/x11.trm */

#endif

/* patch to get home dir, see command.c */

#if defined(MSDOS) || defined(OS2)

char HelpFile[PATH_MAX];

static char progpath[PATH_MAX] = "";

#endif

/* a longjmp buffer to get back to the command line */

static JMP_BUF command_line_env;

static void load_rcfile(int where);

static RETSIGTYPE inter(int anint);

static void init_memory(void);

static int exit_status = EXIT_SUCCESS;

/* Flag for asynchronous handling of Ctrl-C. Used by fit.c and Windows */

TBOOLEAN ctrlc_flag = FALSE;

/* Flag for (asynchronous) term signal on Windows. */

TBOOLEAN terminate_flag = FALSE;

#ifdef OS2

# include <process.h>

static ULONG RexxInterface(PRXSTRING, PUSHORT, PRXSTRING);

TBOOLEAN CallFromRexx = FALSE;

#endif /* OS2 */

static RETSIGTYPE

inter(int anint)

{

(void) anint; /* avoid -Wunused warning */

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

(void) signal(SIGFPE, SIG_DFL); /* turn off FPE trapping */

#ifdef OS2

if (!strcmp(term->name,"pm")) {

PM_intc_cleanup();

/* ??

putc('\n', stderr);

LONGJMP(command_line_env, TRUE);

} else

#endif

#if defined(WGP_CONSOLE)

/* The Windows console Ctrl-C handler runs in another thread. So a

longjmp() would result in crash. Instead, we handle these

events asynchronously.

ctrlc_flag = TRUE;

/* Interrupt ConsoleGetch. */

SendMessage(graphwin->hWndGraph, WM_NULL, 0, 0);

SendMessage(GetConsoleWindow(), WM_CHAR, 0x20, 0);

#else

{

term_reset();

(void) putc('\n', stderr);

bail_to_command_line(); /* return to prompt */

}

#endif

}

/* Normally we return to the command line at a point equivalent

* to program entry, so most context is lost. All loops and

* loaded command files are exited; open files are closed, etc.

* The exception to this is when an error is encountered during a

* "fit" command. In this case the program returns to the same

* point it would have reached if the fit command had succeeded,

* possibly inside a loop or a loaded command file.

void

bail_to_command_line()

{

#ifdef _WIN32

kill_pending_Pause_dialog();

ctrlc_flag = FALSE;

#endif

if (fit_env)

LONGJMP(*fit_env, TRUE);

else

LONGJMP(command_line_env, TRUE);

}

#if defined(_WIN32)

int

gnu_main(int argc_orig, char **argv)

#else

int

main(int argc_orig, char **argv)

#endif

{

int i;

/* We want the current value of argc to persist across a LONGJMP from int_error().

* Without this the compiler may put it on the stack, which LONGJMP clobbers.

* Here we try make it a volatile variable that optimization will not affect.

* Why do we not have to do the same for argv? I don't know.

* But the test cases that broke with generic argc seem fine with generic argv.

static volatile int argc;

argc = argc_orig;

/* 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__

if (setuid(getuid()) != 0) {

fprintf(stderr,"gnuplot: refusing to run at elevated privilege\n");

exit(EXIT_FAILURE);

}

#endif

/* 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

#ifdef OS2

{

int rc = RexxRegisterSubcomExe("GNUPLOT", (PFN) RexxInterface, NULL);

(void) rc;

# ifdef OS2_IPC

os2_ipc_setup();

# endif

}

#endif

/* malloc large blocks, otherwise problems with fragmented mem */

#ifdef MALLOCDEBUG

malloc_debug(7);

#endif

/* init progpath and get helpfile from executable directory */

#if defined(MSDOS) || defined(OS2)

{

char *s;

#ifdef __EMX__

_execname(progpath, sizeof(progpath));

#else

safe_strncpy(progpath, argv[0], sizeof(progpath));

#endif

/* convert '/' to '\\' */

for (s = progpath; *s != NUL; s++)

if (*s == DIRSEP2)

*s = DIRSEP1;

/* cut program name */

s = strrchr(progpath, DIRSEP1);

if (s != NULL)

s++;

else

s = progpath;

*s = NUL;

/* init HelpFile */

strcpy(HelpFile, progpath);

strcat(HelpFile, "gnuplot.gih");

/* remove trailing "bin/" from progpath */

if ((s != NULL) && (s - progpath >= 4)) {

s -= 4;

if (strncasecmp(s, "bin", 3) == 0)

*s = NUL;

}

#endif /* MSDOS || OS2 */

#if (defined(PIPE_IPC) || defined(_WIN32)) && (defined(HAVE_LIBREADLINE) || (defined(HAVE_LIBEDITLINE) && defined(X11)))

/* Editline needs this to be set before the very first call to readline(). */

/* Support for rl_getc_function is broken for utf-8 in editline. Since it is only

really required for X11, disable this section when building without X11. */

rl_getc_function = getc_wrapper;

#endif

#if defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDITLINE)

/* T.Walter 1999-06-24: 'rl_readline_name' must be this fix name.

* It is used to parse a 'gnuplot' specific section in '~/.inputrc'

* or gnuplot specific commands in '.editrc' (when using editline

* instead of readline) */

rl_readline_name = "Gnuplot";

rl_terminal_name = getenv("TERM");

#if defined(HAVE_LIBREADLINE)

using_history();

#else

history_init();

#endif

#if defined(HAVE_LIBREADLINE) && defined(RL_VERSION_MAJOR)

/* Starting with readline v8.1 bracketed paste mode is on by default.

* This breaks multi-line pasted input to gnuplot because it looks like

* one long run-on line.

if (RL_VERSION_MAJOR >= 8)

rl_variable_bind ("enable-bracketed-paste", "off");

#endif

#if defined(HAVE_LIBREADLINE) && !defined(MISSING_RL_TILDE_EXPANSION)

rl_complete_with_tilde_expansion = 1;

#endif

for (i = 1; i < argc; i++) {

if (!argv[i])

continue;

if (!strcmp(argv[i], "-c")) {

/* The rest of the command line is a scriptfile and its arguments.

* Do not try to interpret them here (ignore -V, --help, etc).

break;

}

if (!strcmp(argv[i], "-V") || !strcmp(argv[i], "--version")) {

printf("gnuplot %s patchlevel %s\n",

gnuplot_version, gnuplot_patchlevel);

return 0;

} else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {

printf( "Usage: gnuplot [OPTION] ... [FILE]\n"

" -V, --version\n"

" -h, --help\n"

" -p --persist\n"

" -s --slow\n"

" -d --default-settings\n"

" -c scriptfile ARG1 ARG2 ... \n"

" -e \"command1; command2; ...\"\n"

"gnuplot %s patchlevel %s\n",

gnuplot_version, gnuplot_patchlevel);

#ifdef DEVELOPMENT_VERSION

printf(

#ifdef DIST_CONTACT

"Report bugs to "DIST_CONTACT"\n"

" or %s\n",

#else

"Report bugs to %s\n",

#endif

bug_email);

#endif

return 0;

} else if (!strncmp(argv[i], "-persist", 2) || !strcmp(argv[i], "--persist")

#ifdef _WIN32

|| !stricmp(argv[i], "-noend") || !stricmp(argv[i], "/noend")

#endif

) {

persist_cl = TRUE;

} else if (!strncmp(argv[i], "-slow", 2) || !strcmp(argv[i], "--slow")) {

slow_font_startup = TRUE;

} else if (!strncmp(argv[i], "-d", 2) || !strcmp(argv[i], "--default-settings")) {

/* Skip local customization read from ~/.gnuplot */

skip_gnuplotrc = TRUE;

}

#ifdef X11

/* the X11 terminal removes tokens that it recognizes from argv. */

{

int n = X11_args(argc, argv);

argv += n;

argc -= n;

}

#endif

setbuf(stderr, (char *) NULL);

#ifdef HAVE_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]

if (setvbuf(stdout, (char *) NULL, _IOLBF, (size_t) 1024) != 0)

(void) fputs("Could not linebuffer stdout\n", stderr);

/* Switching to unbuffered mode causes all characters in the input

* buffer to be lost. So the only safe time to do it is on program entry.

* Do any non-X platforms suffer from this problem?

* EAM - Jan 2013 YES.

setvbuf(stdin, (char *) NULL, _IONBF, 0);

#endif

gpoutfile = stdout;

/* Initialize pre-loaded user variables */

/* "pi" is hard-wired as the first variable */

(void) add_udv_by_name("GNUTERM");

(void) add_udv_by_name("I");

(void) add_udv_by_name("NaN");

init_constants();

udv_user_head = &(udv_NaN->next_udv);

init_memory();

interactive = FALSE;

/* April 2017: We used to call init_terminal() here, but now */

/* We defer initialization until error handling has been set up. */

# if defined(_WIN32) && !defined(WGP_CONSOLE)

interactive = TRUE;

# else

interactive = isatty(fileno(stdin));

# endif

/* Note: we want to know whether this is an interactive session so that we can

* decide whether or not to write status information to stderr. The old test

* for this was to see if (argc > 1) but the addition of optional command line

* switches broke this. What we really wanted to know was whether any of the

* command line arguments are file names or an explicit in-line "-e command".

for (i = 1; i < argc; i++) {

# ifdef _WIN32

if (!stricmp(argv[i], "/noend"))

continue;

# endif

if ((argv[i][0] != '-') || (argv[i][1] == 'e') || (argv[i][1] == 'c') ) {

interactive = FALSE;

break;

}

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

if (interactive)

show_version(stderr);

else

show_version(NULL); /* Only load GPVAL_COMPILE_OPTIONS */

update_gpval_variables(3); /* update GPVAL_ variables available to user */

#ifdef VMS

/* initialise screen management routines for command recall */

{

unsigned int ierror;

if (ierror = smg$create_virtual_keyboard(&vms_vkid) != SS$_NORMAL)

done(ierror);

if (ierror = smg$create_key_table(&vms_ktid) != SS$_NORMAL)

done(ierror);

}

#endif /* VMS */

if (!SETJMP(command_line_env, 1)) {

/* first time */

interrupt_setup();

get_user_env();

init_loadpath();

init_locale();

memset(&sm_palette, 0, sizeof(sm_palette));

init_fit(); /* Initialization of fitting module */

#ifdef READLINE

/* When using the built-in readline, we set the initial

encoding according to the locale as this is required

to properly handle keyboard input. */

init_encoding();

#endif

init_gadgets();

/* April 2017: Now that error handling is in place, it is safe parse

* GNUTERM during terminal initialization.

* atexit processing is done in reverse order. We want

* the generic terminal shutdown in term_reset to be executed before

* any terminal specific cleanup requested by individual terminals.

init_terminal();

push_terminal(0); /* remember the initial terminal */

gp_atexit(term_reset);

/* Execute commands in ~/.gnuplot */

init_session();

if (interactive && term != 0) { /* not unknown */

#ifdef GNUPLOT_HISTORY

#if (defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDITLINE)) && !defined(_WIN32)

expanded_history_filename = tilde_expand(GNUPLOT_HISTORY_FILE);

#else

expanded_history_filename = gp_strdup(GNUPLOT_HISTORY_FILE);

gp_expand_tilde(&expanded_history_filename);

#endif

if (read_history(expanded_history_filename)) {

#ifdef USE_XDG_BASEDIR

/* use $XDG_STATE_DIR/gnuplot_history only if

* $XDG_STATE_DIR exists or can be created */

char *xdgpath = xdg_get_path(kXDGStateHome, "gnuplot_history",

FALSE /* no subdir */, TRUE /* create */);

if (xdgpath) {

free(expanded_history_filename);

expanded_history_filename = xdgpath;

read_history(expanded_history_filename);

}

#endif /* USE_XDG_BASEDIR */

}

* It is safe to ignore the return values of 'atexit()' and

* 'on_exit()'. In the worst case, there is no history of your

* current session and you have to type all again in your next

* session.

gp_atexit(wrapper_for_write_history);

#endif /* GNUPLOT_HISTORY */

#if defined(READLINE) && defined(WGP_CONSOLE)

fprintf(stderr, "Encoding set to '%s'.\n", encoding_names[encoding]);

#endif

} /* if (interactive && term != 0) */

} else {

/* come back here from int_error() */

if (!successful_initialization) {

/* Only print the warning once */

successful_initialization = TRUE;

fprintf(stderr,"WARNING: Error during initialization\n\n");

}

if (interactive == FALSE)

exit_status = EXIT_FAILURE;

#ifdef HAVE_READLINE_RESET

else {

/* reset properly readline after a SIGINT+longjmp */

rl_reset_after_signal ();

}

#endif

/* If we were in a "load", "call", or nested bracketed clause

* clean up the lf_push/pop stack and restore shadowed variables.

clause_reset_after_error();

lf_reset_after_error();

SET_CURSOR_ARROW;

#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 */

/* Why a goto? Because we exited the loop below via int_error */

/* using LONGJMP. The compiler was not expecting this, and */

/* "optimized" the handling of argc and argv such that simply */

/* entering the loop again from the top finds them messed up. */

/* If we reenter the loop via a goto then there is some hope */

/* that code reordering does not hurt us. */

if (reading_from_dash && interactive)

goto RECOVER_FROM_ERROR_IN_DASH;

reading_from_dash = FALSE;

if (!interactive && !noinputfiles) {

term_reset();

gp_exit(EXIT_FAILURE); /* exit on non-interactive error */

}

/* load filenames given as arguments */

while (--argc > 0) {

++argv;

c_token = 0;

if (!strncmp(*argv, "-persist", 2) || !strcmp(*argv, "--persist")

#ifdef _WIN32

|| !stricmp(*argv, "-noend") || !stricmp(*argv, "/noend")

#endif

) {

FPRINTF((stderr,"'persist' command line option recognized\n"));

} else if (strcmp(*argv, "-") == 0) {

#if defined(_WIN32) && !defined(WGP_CONSOLE)

TextShow(&textwin);

interactive = TRUE;

#else

interactive = isatty(fileno(stdin));

#endif

RECOVER_FROM_ERROR_IN_DASH:

reading_from_dash = TRUE;

while (!com_line());

reading_from_dash = FALSE;

interactive = FALSE;

noinputfiles = FALSE;

} else if (strcmp(*argv, "-e") == 0) {

int save_state = interactive;

--argc; ++argv;

if (argc <= 0) {

fprintf(stderr, "syntax: gnuplot -e \"commands\"\n");

return 0;

}

interactive = FALSE;

noinputfiles = FALSE;

do_string(*argv);

interactive = save_state;

} else if (!strncmp(*argv, "-slow", 2) || !strcmp(*argv, "--slow")) {

slow_font_startup = TRUE;

} else if (!strncmp(*argv, "-d", 2) || !strcmp(*argv, "--default-settings")) {

/* Ignore this; it already had its effect */

FPRINTF((stderr, "ignoring -d\n"));

} else if (strcmp(*argv, "-c") == 0) {

/* Pass command line arguments to the gnuplot script in the next

* argument. This consumes the remainder of the command line

interactive = FALSE;

noinputfiles = FALSE;

--argc; ++argv;

if (argc <= 0) {

fprintf(stderr, "syntax: gnuplot -c scriptname args\n");

gp_exit(EXIT_FAILURE);

}

call_argc = GPMIN(9, argc - 1);

for (i = 0; i < call_argc; i++) {

/* Need to stash argv[i] somewhere visible to load_file() */

call_args[i] = gp_strdup(argv[i + 1]);

}

load_file(loadpath_fopen(*argv, "r"), gp_strdup(*argv), 5);

gp_exit(EXIT_SUCCESS);

} else if (*argv[0] == '-') {

fprintf(stderr, "unrecognized option %s\n", *argv);

} else {

interactive = FALSE;

noinputfiles = FALSE;

load_file(loadpath_fopen(*argv, "r"), gp_strdup(*argv), 4);

}

/* take commands from stdin */

if (noinputfiles) {

while (!com_line())

ctrlc_flag = FALSE; /* reset asynchronous Ctrl-C flag */

}

#ifdef _WIN32

/* On Windows, handle 'persist' by keeping the main input loop running (windows/wxt), */

/* but only if there are any windows open. Note that qt handles this properly. */

if (persist_cl) {

if (WinAnyWindowOpen()) {

#ifdef WGP_CONSOLE

if (!interactive) {

/* no further input from pipe */

while (WinAnyWindowOpen())

win_sleep(100);

} else

#endif

{

interactive = TRUE;

while (!com_line())

ctrlc_flag = FALSE; /* reset asynchronous Ctrl-C flag */

interactive = FALSE;

}

#endif

#if (defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDITLINE)) && defined(GNUPLOT_HISTORY)

#if !defined(HAVE_ATEXIT) && !defined(HAVE_ON_EXIT)

/* You should be here if you neither have 'atexit()' nor 'on_exit()' */

wrapper_for_write_history();

#endif /* !HAVE_ATEXIT && !HAVE_ON_EXIT */

#endif /* (HAVE_LIBREADLINE || HAVE_LIBEDITLINE) && GNUPLOT_HISTORY */

#ifdef OS2

RexxDeregisterSubcom("GNUPLOT", NULL);

#endif

/* HBB 20040223: Not all compilers like exit() to end main() */

/* exit(exit_status); */

#if ! defined(_WIN32)

/* Windows does the cleanup later */

gp_exit_cleanup();

#endif

return exit_status;

}

/* Set up to catch interrupts */

void

interrupt_setup()

{

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

#ifdef SIGPIPE

/* ignore pipe errors, this might happen with set output "|head" */

(void) signal(SIGPIPE, SIG_IGN);

#endif /* SIGPIPE */

}

* Initialize 'constants' stored as variables (user could mangle these)

void

init_constants()

{

(void) Gcomplex(&udv_pi.udv_value, M_PI, 0.0);

udv_NaN = get_udv_by_name("NaN");

(void) Gcomplex(&(udv_NaN->udv_value), not_a_number(), 0.0);

udv_I = get_udv_by_name("I");

(void) Gcomplex(&(udv_I->udv_value), 0.0, 1.0);

}

* Initialize graphics context, color palette, local preferences.

* Called both at program startup and by "reset session".

void

init_session()

{

/* Disable pipes and system commands during initialization */

successful_initialization = FALSE;

/* Undefine any previously-used variables */

del_udv_by_name("",TRUE);

/* Restore default colors before loading local preferences */

set_colorsequence(1);

/* Reset program variables not handled by 'reset' */

overflow_handling = INT64_OVERFLOW_TO_FLOAT;

suppress_warnings = FALSE;

/* Reset voxel data structures if supported */

init_voxelsupport();

/* Make sure all variables start in the same state 'reset'

* would set them to.

reset_command(); /* FIXME: this does c_token++ */

load_rcfile(0); /* System-wide gnuplotrc if configured */

load_rcfile(1); /* ./.gnuplot if configured */

/* After this point we allow pipes and system commands */

successful_initialization = TRUE;

load_rcfile(2); /* ~/.gnuplot */

load_rcfile(3); /* ~/.config/gnuplot/gnuplotrc */

}

* Read commands from an initialization file.

* where = 0: look for gnuplotrc in system shared directory

* where = 1: look for .gnuplot in current directory

* where = 2: look for .gnuplot in home directory

static void

load_rcfile(int where)

{

FILE *plotrc = NULL;

char *rcfile = NULL;

if (skip_gnuplotrc)

return;

if (where == 0) {

#ifdef GNUPLOT_SHARE_DIR

# if defined(_WIN32) || defined(MSDOS) || defined(OS2)

rcfile = RelativePathToGnuplot(GNUPLOT_SHARE_DIR "\\gnuplotrc");

# else

rcfile = (char *) gp_alloc(strlen(GNUPLOT_SHARE_DIR) + 1 + strlen("gnuplotrc") + 1, "rcfile");

strcpy(rcfile, GNUPLOT_SHARE_DIR);

PATH_CONCAT(rcfile, "gnuplotrc");

# endif

plotrc = fopen(rcfile, "r");

#endif

} else if (where == 1) {

#ifdef USE_CWDRC

/* Allow check for a .gnuplot init file in the current directory */

/* This is a security risk, as someone might leave a malicious */

/* init file in a shared directory. */

plotrc = fopen(PLOTRC, "r");

#endif /* !USE_CWDRC */

} else if (where == 2 && user_homedir) {

/* length of homedir + directory separator + length of file name + \0 */

int len = (user_homedir ? strlen(user_homedir) : 0) + 1 + strlen(PLOTRC) + 1;

rcfile = gp_alloc(len, "rcfile");

strcpy(rcfile, user_homedir);

PATH_CONCAT(rcfile, PLOTRC);

plotrc = fopen(rcfile, "r");

} else if (where == 3) {

#ifdef USE_XDG_BASEDIR

rcfile = xdg_get_path(kXDGConfigHome, "gnuplotrc",

TRUE /* use subdir */, FALSE /* not create */);

if (rcfile)

plotrc = fopen(rcfile, "r");

#endif

}

if (plotrc) {

char *rc = gp_strdup(rcfile ? rcfile : PLOTRC);

load_file(plotrc, rc, 3);

push_terminal(0); /* needed if terminal or its options were changed */

}

free(rcfile);

}

void

get_user_env()

{

if (user_homedir == NULL) {

const char *env_home;

if ((env_home = getenv(HOME))

#ifdef _WIN32

|| (env_home = appdata_directory())

|| (env_home = getenv("USERPROFILE"))

#endif

|| (env_home = getenv("HOME"))

)

user_homedir = (const char *) gp_strdup(env_home);

else if (interactive)

int_warn(NO_CARET, "no HOME found");

}

if (user_shell == NULL) {

const char *env_shell;

if ((env_shell = getenv("SHELL")) == NULL)

#if defined(MSDOS) || defined(_WIN32) || defined(OS2)

if ((env_shell = getenv("COMSPEC")) == NULL)

#endif

env_shell = SHELL;

user_shell = (const char *) gp_strdup(env_shell);

}

/* expand tilde in path

* path cannot be a static array!

* tilde must be the first character in *pathp;

* we may change that later

void

gp_expand_tilde(char **pathp)

{

if (!*pathp)

int_error(NO_CARET, "Cannot expand empty path");

if ((*pathp)[0] == '~' && (*pathp)[1] == DIRSEP1) {

if (user_homedir) {

size_t n = strlen(*pathp);

*pathp = gp_realloc(*pathp, n + strlen(user_homedir), "tilde expansion");

/* include null at the end ... */

memmove(*pathp + strlen(user_homedir) - 1, *pathp, n + 1);

memcpy(*pathp, user_homedir, strlen(user_homedir));

} else

int_warn(NO_CARET, "HOME not set - cannot expand tilde");

}

static void

init_memory()

{

extend_input_line();

extend_token_table();

replot_line = gp_strdup("");

}

#ifdef OS2

int

ExecuteMacro(char *argv, int namelength)

{

RXSTRING rxRc;

RXSTRING rxArg[2];

int rxArgCount = 0;

char pszName[CCHMAXPATH];

char *rxArgStr;

short sRc;

long rc;

if (namelength >= sizeof(pszName))

return 1;

safe_strncpy(pszName, argv, sizeof(pszName));

rxArgStr = &argv[namelength];

RXSTRPTR(rxRc) = NULL;

REXX standard calling (gnuplot 3.7pl1 and above):

The program name is not supplied and so all actual arguments

are in a single string:

Parse Arg param

We even handle blanks like cmd.exe when calling REXX programs.

if (*rxArgStr) {

MAKERXSTRING(rxArg[0], rxArgStr, strlen(rxArgStr));

rxArgCount++;

}

CallFromRexx = TRUE;

rc = RexxStart(

rxArgCount,

rxArg,

pszName,

NULL,

"GNUPLOT",

RXCOMMAND,

NULL,

&sRc,

&rxRc);

CallFromRexx = FALSE;

/* am: a word WRT errors codes:

the negative ones don't seem to have symbolic names, you can get

them from the OREXX reference, they're not in REXX Programming Guide -

no idea where to retrieve them from a Warp 3 reference ??

The positive ones are somehow referenced in REXXPG

if (rc < 0) {

/* REXX error */

} else if (rc > 0) {

/* Interpreter couldn't be started */

if (rc == -4)

/* run was cancelled, but don't give error message */

rc = 0;

} else if (rc==0) {

/* all was fine */

}

/* We don't we try to use rxRc ?

BTW, don't use free() instead since it's allocated inside RexxStart()

and not in our executable using the EMX libraries */

if (RXSTRPTR(rxRc))

/* I guess it's NULL if something major went wrong,

NULL strings are usually not part of the REXX language ... */

DosFreeMem(rxRc.strptr);

return rc;

}

/* Rexx command line interface */

ULONG

RexxInterface(PRXSTRING rxCmd, PUSHORT pusErr, PRXSTRING rxRc)

{

int rc;

static JMP_BUF keepenv;

int cmdlen;

memcpy(keepenv, command_line_env, sizeof(JMP_BUF));

if (!SETJMP(command_line_env, 1)) {

/* Set variable gp_input_line.

Watch out for line length of NOT_ZERO_TERMINATED strings ! */

cmdlen = rxCmd->strlength + 1;

safe_strncpy(gp_input_line, rxCmd->strptr, gp_input_line_len);

gp_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 {

We end up here when bail_to_command_line() is called.

View remainder of file in raw view

gnuplot/src/plot.c at 5.5 · gnuplot/gnuplot · GitHub

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