/*
* 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;
/* 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 */
}
int main()
{
int flags = fcntl(0, F_GETFL, 0);
fcntl(0, F_SETFL, flags | O_NONBLOCK);
char buffer[1024];
getcwd(directory, 1024);
List* l = list_constructor();
command_t command;
reset_command(&command);
prompt();
while(1)
{
if(read(0, buffer, 1023) > 0)
{
// read the command into the struct
read_command(buffer, &command);
// parse the command for background execution, change directory, or file redirection
parse_command(&command);
/* call the command handler.
this will execute the command. handles both background and non-background
*/
int pid = command_handler(&command, l);
if(pid == 0)
{
return 0;
}
// reset the command.
reset_command(&command);
}
// check for background commands and remove them from the wait list.
check_background_commands(l);
}
return 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 loadin local preferences */
set_colorsequence(1);
/* 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 */
}
int
main(int argc, char **argv)
#endif
{
int i;
#ifdef LINUXVGA
LINUX_setup(); /* setup VGA before dropping privilege DBT 4/5/99 */
drop_privilege();
#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;
#ifdef OS2_IPC
char semInputReadyName[40];
sprintf( semInputReadyName, "\\SEM32\\GP%i_Input_Ready", getpid() );
rc = DosCreateEventSem(semInputReadyName,&semInputReady,0,0);
if (rc != 0)
fputs("DosCreateEventSem error\n",stderr);
#endif
rc = RexxRegisterSubcomExe("GNUPLOT", (PFN) RexxInterface, NULL);
#endif
/* malloc large blocks, otherwise problems with fragmented mem */
#ifdef MALLOCDEBUG
malloc_debug(7);
#endif
/* get helpfile from home directory */
#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
#if defined(HAVE_LIBEDITLINE)
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");
using_history();
#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], "-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"
#ifdef X11
"for X11 options see 'help X11->command-line-options'\n"
#endif
" -V, --version\n"
" -h, --help\n"
" -p --persist\n"
" -e \"command1; command2; ...\"\n"
"gnuplot %s patchlevel %s\n"
#ifdef DIST_CONTACT
"Report bugs to "DIST_CONTACT"\n"
" or %s\n",
#else
"Report bugs to %s\n",
#endif
gnuplot_version, gnuplot_patchlevel, bug_email);
return 0;
} else if (!strncmp(argv[i], "-persist", 2) || !strcmp(argv[i], "--persist")) {
persist_cl = 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]
* 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)
(void) fputs("Could not linebuffer stdout\n", stderr);
#ifdef X11
/* This call used to be in x11.trm, with the following comment:
* Multi-character inputs like escape sequences but also mouse-pasted
* text got buffered and therefore didn't trigger the select() function
* in X11_waitforinput(). Switching to unbuffered input solved this.
* 23 Jan 2002 (joze)
* But 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.
* The #ifdef X11 is probably unnecessary, but makes the change minimal.
* Do any non-X platforms suffer from the same problem?
* EAM - Jan 2004.
*/
setvbuf(stdin, (char *) NULL, _IONBF, 0);
#endif
#endif
gpoutfile = stdout;
/* Initialize pre-loaded user variables */
(void) Gcomplex(&udv_pi.udv_value, M_PI, 0.0);
udv_NaN = add_udv_by_name("NaN");
(void) Gcomplex(&(udv_NaN->udv_value), not_a_number(), 0.0);
udv_NaN->udv_undef = FALSE;
init_memory();
interactive = FALSE;
init_terminal(); /* can set term type if it likes */
push_terminal(0); /* remember the default terminal */
/* reset the terminal when exiting */
/* this is done through gp_atexit so that other terminal functions
* can be registered to be executed before the terminal is reset. */
GP_ATEXIT(term_reset);
# if defined(_Windows) && ! defined(WGP_CONSOLE)
interactive = TRUE;
# else
interactive = isatty(fileno(stdin));
# endif
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);
# elif defined(DJGPP)
if (!strncmp(uts.sysname, "??Un", 4)) /* don't print ??Unknow" */
strcpy(os_name, "Unknown");
else {
strcpy(os_name, uts.sysname);
strcpy(os_rel, uts.release);
}
# else
strcpy(os_name, uts.sysname);
strcpy(os_rel, uts.release);
# ifdef OS2
if (!strchr(os_rel,'.'))
/* write either "2.40" or "4.0", or empty -- don't print "OS/2 1" */
strcpy(os_rel, "");
# endif
# endif
}
}
#else /* ! HAVE_SYS_UTSNAME_H */
strcpy(os_name, OS);
strcpy(os_rel, "");
#endif /* HAVE_SYS_UTSNAME_H */
if (interactive)
show_version(stderr);
else
show_version(NULL); /* Only load GPVAL_COMPILE_OPTIONS */
#ifdef WGP_CONSOLE
#ifdef CONSOLE_SWITCH_CP
if (cp_changed && interactive) {
fprintf(stderr,
"\ngnuplot changed the codepage of this console from %i to %i to\n" \
"match the graph window. Some characters might only display correctly\n" \
"if you change the font to a non-raster type.\n",
cp_input, GetConsoleCP());
}
#else
if ((GetConsoleCP() != GetACP()) && interactive) {
fprintf(stderr,
"\nWarning: The codepage of the graph window (%i) and that of the\n" \
"console (%i) differ. Use `set encoding` or `!chcp` if extended\n" \
"characters don't display correctly.\n",
GetACP(), GetConsoleCP());
}
#endif
#endif
update_gpval_variables(3); /* update GPVAL_ variables available to user */
#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();
/* should move this stuff another initialisation routine,
* something like init_set() maybe */
get_user_env();
init_loadpath();
init_locale();
/* HBB: make sure all variables start in the same mode 'reset'
* would set them to. Since the axis variables aren't in
* initialized arrays any more, this is now necessary... */
reset_command();
init_color(); /* Initialization of color */
load_rcfile();
init_fit(); /* Initialization of fitting module */
if (interactive && term != 0) { /* not unknown */
#ifdef GNUPLOT_HISTORY
FPRINTF((stderr, "Before read_history\n"));
#if defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDITLINE)
expanded_history_filename = tilde_expand(GNUPLOT_HISTORY_FILE);
#else
expanded_history_filename = gp_strdup(GNUPLOT_HISTORY_FILE);
gp_expand_tilde(&expanded_history_filename);
#endif
FPRINTF((stderr, "expanded_history_filename = %s\n", expanded_history_filename));
read_history(expanded_history_filename);
{
/* BEGIN: Go local to get environment variable */
const char *temp_env = getenv ("GNUPLOT_HISTORY_SIZE");
if (temp_env)
gnuplot_history_size = strtol (temp_env, (char **) NULL, 10);
} /* END: Go local to get environment variable */
/*
* It is safe to ignore the return values of 'atexit()' and
* 'on_exit()'. In the worst case, there is no history of your
* currrent session and you have to type all again in your next
* session.
* This is the default behaviour (traditional reasons), too.
* In case you don't have one of these functions, or you don't
* want to use them, 'write_history()' is called directly.
*/
GP_ATEXIT(wrapper_for_write_history);
#endif /* GNUPLOT_HISTORY */
fprintf(stderr, "\nTerminal type set to '%s'\n", term->name);
} /* if (interactive && term != 0) */
} else {
/* come back here from int_error() */
if (interactive == FALSE)
exit_status = EXIT_FAILURE;
#ifdef HAVE_READLINE_RESET
else
{
/* reset properly readline after a SIGINT+longjmp */
rl_reset_after_signal ();
}
#endif
load_file_error(); /* if we were in load_file(), cleanup */
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$OUTPUT as stdout\n", stderr);
}
}
gpoutfile = stdout;
}
#endif /* VMS */
if (!interactive && !noinputfiles) {
term_reset();
exit(EXIT_FAILURE); /* exit on non-interactive error */
}
}
if (argc > 1) {
#ifdef _Windows
TBOOLEAN noend = persist_cl;
#endif
/* load filenames given as arguments */
while (--argc > 0) {
++argv;
c_token = 0;
#ifdef _Windows
if (stricmp(*argv, "-noend") == 0 || stricmp(*argv, "/noend") == 0
|| stricmp(*argv, "-persist") == 0)
noend = TRUE;
else
#endif
if (!strncmp(*argv, "-persist", 2) || !strcmp(*argv, "--persist")) {
FPRINTF((stderr,"'persist' command line option recognized\n"));
} else if (strcmp(*argv, "-") == 0) {
interactive = TRUE;
while (!com_line());
interactive = FALSE;
} else if (strcmp(*argv, "-e") == 0) {
--argc; ++argv;
if (argc <= 0) {
fprintf(stderr, "syntax: gnuplot -e \"commands\"\n");
return 0;
}
do_string(*argv);
} else {
load_file(loadpath_fopen(*argv, "r"), gp_strdup(*argv), FALSE);
}
}
#ifdef _Windows
if (noend) {
interactive = TRUE;
while (!com_line());
}
#endif
} else {
/* take commands from stdin */
while (!com_line());
}
#if (defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDITLINE)) && defined(GNUPLOT_HISTORY)
#if !defined(HAVE_ATEXIT) && !defined(HAVE_ON_EXIT)
/* You should be here if you neither have 'atexit()' nor 'on_exit()' */
wrapper_for_write_history();
#endif /* !HAVE_ATEXIT && !HAVE_ON_EXIT */
#endif /* (HAVE_LIBREADLINE || HAVE_LIBEDITLINE) && GNUPLOT_HISTORY */
#ifdef OS2
RexxDeregisterSubcom("GNUPLOT", NULL);
#endif
/* HBB 20040223: Not all compilers like exit() to end main() */
/* exit(exit_status); */
return exit_status;
}
static int command()
{
FILE *fp;
int i;
/* string holding name of save or load file */
char sv_file[MAX_LINE_LEN + 1];
for (i = 0; i < MAX_NUM_VAR; i++)
c_dummy_var[i][0] = NUL; /* no dummy variables */
if (is_definition(c_token))
define();
else if (almost_equals(c_token, "h$elp") || equals(c_token, "?")) {
c_token++;
do_help(1);
} else if (equals(c_token, "testtime")) {
/* given a format and a time string, exercise the time code */
char format[160], string[160];
struct tm tm;
double secs;
if (isstring(++c_token)) {
quote_str(format, c_token, 159);
if (isstring(++c_token)) {
quote_str(string, c_token++, 159);
memset(&tm, 0, sizeof(tm));
gstrptime(string, format, &tm);
secs = gtimegm(&tm);
fprintf(stderr, "internal = %f - %d/%d/%d::%d:%d:%d , wday=%d, yday=%d\n",
secs, tm.tm_mday, tm.tm_mon + 1, tm.tm_year % 100, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday, tm.tm_yday);
memset(&tm, 0, sizeof(tm));
ggmtime(&tm, secs);
gstrftime(string, 159, format, secs);
fprintf(stderr, "convert back \"%s\" - %d/%d/%d::%d:%d:%d , wday=%d, yday=%d\n",
string, tm.tm_mday, tm.tm_mon + 1, tm.tm_year % 100, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday, tm.tm_yday);
}
}
} else if (almost_equals(c_token, "test")) {
c_token++;
test_term();
} else if (almost_equals(c_token, "scr$eendump")) {
c_token++;
#ifdef _Windows
screen_dump();
#else
fputs("screendump not implemented\n", stderr);
#endif
} else if (almost_equals(c_token, "pa$use")) {
struct value a;
int sleep_time, text = 0;
char buf[MAX_LINE_LEN + 1];
c_token++;
sleep_time = (int) real(const_express(&a));
buf[0] = NUL;
if (!(END_OF_COMMAND)) {
if (!isstring(c_token))
int_error("expecting string", c_token);
else {
quote_str(buf, c_token, MAX_LINE_LEN);
++c_token;
#ifdef _Windows
if (sleep_time >= 0)
#else
# ifdef OS2
if (strcmp(term->name, "pm") != 0 || sleep_time >= 0)
# else
# ifdef MTOS
if (strcmp(term->name, "mtos") != 0 || sleep_time >= 0)
# endif /* MTOS */
# endif /* OS2 */
#endif /* _Windows */
fputs(buf, stderr);
text = 1;
}
}
if (sleep_time < 0) {
#ifdef _Windows
if (!Pause(buf))
bail_to_command_line();
#else
# ifdef OS2
if (strcmp(term->name, "pm") == 0 && sleep_time < 0) {
int rc;
if ((rc = PM_pause(buf)) == 0)
bail_to_command_line();
else if (rc == 2) {
fputs(buf, stderr);
text = 1;
(void) fgets(buf, MAX_LINE_LEN, stdin);
}
}
# else /* !OS2 */
# ifdef _Macintosh
if (strcmp(term->name, "macintosh") == 0 && sleep_time < 0)
Pause(sleep_time);
# else /* !_Macintosh */
# ifdef MTOS
if (strcmp(term->name, "mtos") == 0) {
int MTOS_pause(char *buf);
int rc;
if ((rc = MTOS_pause(buf)) == 0)
bail_to_command_line();
else if (rc == 2) {
fputs(buf, stderr);
text = 1;
(void) fgets(buf, MAX_LINE_LEN, stdin);
}
} else if (strcmp(term->name, "atari") == 0) {
char *readline(char *);
char *line = readline("");
if (line)
free(line);
} else
(void) fgets(buf, MAX_LINE_LEN, stdin);
# else /* !MTOS */
# ifdef ATARI
if (strcmp(term->name, "atari") == 0) {
char *readline(char *);
char *line = readline("");
if (line)
free(line);
} else
(void) fgets(buf, MAX_LINE_LEN, stdin);
# else /* !ATARI */
(void) fgets(buf, MAX_LINE_LEN, stdin);
/* Hold until CR hit. */
# endif /* !ATARI */
# endif /* !MTOS */
# endif /* !_Macintosh */
# endif /* !OS2 */
#endif
}
if (sleep_time > 0)
GP_SLEEP(sleep_time);
if (text != 0 && sleep_time >= 0)
fputc('\n', stderr);
screen_ok = FALSE;
} else if (almost_equals(c_token, "pr$int")) {
int need_space = 0; /* space printed between two expressions only */
screen_ok = FALSE;
do {
++c_token;
if (isstring(c_token)) {
char s[MAX_LINE_LEN];
quote_str(s, c_token, MAX_LINE_LEN);
fputs(s, stderr);
need_space = 0;
++c_token;
} else {
struct value a;
(void) const_express(&a);
if (need_space)
putc(' ', stderr);
need_space = 1;
disp_value(stderr, &a);
}
} while (!END_OF_COMMAND && equals(c_token, ","));
(void) putc('\n', stderr);
} else if (almost_equals(c_token, "fit")) {
++c_token;
do_fit();
} else if (almost_equals(c_token, "up$date")) {
char tmps[80];
char tmps2[80];
/* Have to initialise tmps2, otherwise
* update() cannot decide whether a valid
* filename was given. lh
*/
tmps2[0] = NUL;
if (!isstring(++c_token))
int_error("Parameter filename expected", c_token);
quote_str(tmps, c_token++, 80);
if (!(END_OF_COMMAND)) {
if (!isstring(c_token))
int_error("New parameter filename expected", c_token);
else
quote_str(tmps2, c_token++, 80);
}
update(tmps, tmps2);
} else if (almost_equals(c_token, "p$lot")) {
plot_token = c_token++;
SET_CURSOR_WAIT;
plotrequest();
SET_CURSOR_ARROW;
} else if (almost_equals(c_token, "sp$lot")) {
plot_token = c_token++;
SET_CURSOR_WAIT;
plot3drequest();
SET_CURSOR_ARROW;
} else if (almost_equals(c_token, "rep$lot")) {
if (replot_line[0] == NUL)
int_error("no previous plot", c_token);
c_token++;
SET_CURSOR_WAIT;
replotrequest();
SET_CURSOR_ARROW;
} else if (almost_equals(c_token, "se$t"))
set_command();
else if (almost_equals(c_token, "res$et"))
reset_command();
else if (almost_equals(c_token, "sh$ow"))
show_command();
else if (almost_equals(c_token, "cl$ear")) {
term_start_plot();
if (multiplot && term->fillbox) {
unsigned int x1 = (unsigned int) (xoffset * term->xmax);
unsigned int y1 = (unsigned int) (yoffset * term->ymax);
unsigned int width = (unsigned int) (xsize * term->xmax);
unsigned int height = (unsigned int) (ysize * term->ymax);
(*term->fillbox) (0, x1, y1, width, height);
}
term_end_plot();
screen_ok = FALSE;
c_token++;
} else if (almost_equals(c_token, "she$ll")) {
do_shell();
screen_ok = FALSE;
c_token++;
} else if (almost_equals(c_token, "sa$ve")) {
if (almost_equals(++c_token, "f$unctions")) {
if (!isstring(++c_token))
int_error("expecting filename", c_token);
else {
quote_str(sv_file, c_token, MAX_LINE_LEN);
save_functions(fopen(sv_file, "w"));
}
} else if (almost_equals(c_token, "v$ariables")) {
if (!isstring(++c_token))
int_error("expecting filename", c_token);
else {
quote_str(sv_file, c_token, MAX_LINE_LEN);
save_variables(fopen(sv_file, "w"));
}
} else if (almost_equals(c_token, "s$et")) {
if (!isstring(++c_token))
int_error("expecting filename", c_token);
else {
quote_str(sv_file, c_token, MAX_LINE_LEN);
save_set(fopen(sv_file, "w"));
}
} else if (isstring(c_token)) {
quote_str(sv_file, c_token, MAX_LINE_LEN);
save_all(fopen(sv_file, "w"));
} else {
int_error("filename or keyword 'functions', 'variables', or 'set' expected", c_token);
}
c_token++;
} else if (almost_equals(c_token, "l$oad")) {
if (!isstring(++c_token))
int_error("expecting filename", c_token);
else {
quote_str(sv_file, c_token, MAX_LINE_LEN);
/* load_file(fp=fopen(sv_file, "r"), sv_file, FALSE); OLD
* DBT 10/6/98 handle stdin as special case
* passes it on to load_file() so that it gets
* pushed on the stack and recusion will work, etc
*/
fp = strcmp(sv_file, "-") ? fopen(sv_file, "r") : stdin;
load_file(fp, sv_file, FALSE);
/* input_line[] and token[] now destroyed! */
c_token = num_tokens = 0;
}
} else if (almost_equals(c_token, "ca$ll")) {
if (!isstring(++c_token))
int_error("expecting filename", c_token);
else {
quote_str(sv_file, c_token, MAX_LINE_LEN);
load_file(fopen(sv_file, "r"), sv_file, TRUE); /* Argument list follows filename */
/* input_line[] and token[] now destroyed! */
c_token = num_tokens = 0;
}
} else if (almost_equals(c_token, "if")) {
double exprval;
struct value t;
if (!equals(++c_token, "(")) /* no expression */
int_error("expecting (expression)", c_token);
exprval = real(const_express(&t));
if (exprval != 0.0) {
/* fake the condition of a ';' between commands */
int eolpos = token[num_tokens - 1].start_index + token[num_tokens - 1].length;
--c_token;
token[c_token].length = 1;
token[c_token].start_index = eolpos + 2;
input_line[eolpos + 2] = ';';
input_line[eolpos + 3] = NUL;
} else
c_token = num_tokens = 0;
} else if (almost_equals(c_token, "rer$ead")) {
fp = lf_top();
if (fp != (FILE *) NULL)
rewind(fp);
c_token++;
} else if (almost_equals(c_token, "cd")) {
if (!isstring(++c_token))
int_error("expecting directory name", c_token);
else {
quote_str(sv_file, c_token, MAX_LINE_LEN);
if (changedir(sv_file)) {
int_error("Can't change to this directory", c_token);
}
c_token++;
}
} else if (almost_equals(c_token, "pwd")) {
GP_GETCWD(sv_file, sizeof(sv_file));
fprintf(stderr, "%s\n", sv_file);
c_token++;
} else if (almost_equals(c_token, "ex$it") ||
almost_equals(c_token, "q$uit")) {
/* graphics will be tidied up in main */
return (1);
} else if (!equals(c_token, ";")) { /* null statement */
#ifdef OS2
if (_osmode == OS2_MODE) {
if (token[c_token].is_token) {
int rc;
rc = ExecuteMacro(input_line + token[c_token].start_index,
token[c_token].length);
if (rc == 0) {
c_token = num_tokens = 0;
return (0);
}
}
}
#endif
int_error("invalid command", c_token);
}
return (0);
}
