/*
* Copyright (C) 1984-2023 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Entry point, initialization, miscellaneous routines.
*/
public char * every_first_cmd = NULL;
public int new_file;
public int is_tty;
public IFILE curr_ifile = NULL_IFILE;
public IFILE old_ifile = NULL_IFILE;
public struct scrpos initial_scrpos;
public POSITION start_attnpos = NULL_POSITION;
public POSITION end_attnpos = NULL_POSITION;
public int wscroll;
public char * progname;
public int quitting;
public int secure;
public int dohelp;
public int more_mode = 0;
#if LOGFILE
public int logfile = -1;
public int force_logfile = FALSE;
public char * namelogfile = NULL;
#endif
#if EDITOR
public char * editor;
public char * editproto;
#endif
public int one_screen;
extern int less_is_more;
extern int missing_cap;
extern int know_dumb;
extern int pr_type;
extern int quit_if_one_screen;
extern int no_init;
extern int errmsgs;
extern int redraw_on_quit;
extern int term_init_done;
extern int first_time;
#if SECURE
secure = 1;
#else
secure = 0;
s = lgetenv("LESSSECURE");
if (!isnullenv(s))
secure = 1;
#endif
#ifdef WIN32
if (getenv("HOME") == NULL)
{
/*
* If there is no HOME environment variable,
* try the concatenation of HOMEDRIVE + HOMEPATH.
*/
char *drive = getenv("HOMEDRIVE");
char *path = getenv("HOMEPATH");
if (drive != NULL && path != NULL)
{
char *env = (char *) ecalloc(strlen(drive) +
strlen(path) + 6, sizeof(char));
strcpy(env, "HOME=");
strcat(env, drive);
strcat(env, path);
putenv(env);
}
}
GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
#endif /* WIN32 */
/*
* Process command line arguments and LESS environment arguments.
* Command line arguments override environment arguments.
*/
if (strcmp(getprogname(), "more") == 0)
more_mode = 1;
/*
* If the name of the executable program is "more",
* act like LESS_IS_MORE is set.
*/
s = last_component(progname);
if (strcmp(s, "more") == 0)
less_is_more = 1;
init_prompt();
s = lgetenv(less_is_more ? "MORE" : "LESS");
if (s != NULL)
scan_option(s);
if (isoptpending())
{
/*
* Last command line option was a flag requiring a
* following string, but there was no following string.
*/
nopendopt();
quit(QUIT_OK);
}
/*
* Call get_ifile with all the command line filenames
* to "register" them with the ifile system.
*/
ifile = NULL_IFILE;
if (dohelp)
ifile = get_ifile(FAKE_HELPFILE, ifile);
while (argc-- > 0)
{
#if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
/*
* Because the "shell" doesn't expand filename patterns,
* treat each argument as a filename pattern rather than
* a single filename.
* Expand the pattern and iterate over the expanded list.
*/
struct textlist tlist;
char *filename;
char *gfilename;
char *qfilename;
gfilename = lglob(*argv++);
init_textlist(&tlist, gfilename);
filename = NULL;
while ((filename = forw_textlist(&tlist, filename)) != NULL)
{
qfilename = shell_unquote(filename);
(void) get_ifile(qfilename, ifile);
free(qfilename);
ifile = prev_ifile(NULL_IFILE);
}
free(gfilename);
#else
(void) get_ifile(*argv++, ifile);
ifile = prev_ifile(NULL_IFILE);
#endif
}
/*
* Set up terminal, etc.
*/
if (!is_tty)
{
/*
* Output is not a tty.
* Just copy the input file(s) to output.
*/
set_output(1); /* write to stdout */
SET_BINARY(1);
if (edit_first() == 0)
{
do {
cat_file();
} while (edit_next(1) == 0);
}
quit(QUIT_OK);
}
if (missing_cap && !know_dumb && !more_mode)
error("WARNING: terminal is not fully functional", NULL_PARG);
open_getchr();
raw_mode(1);
init_signals(1);
/*
* Select the first file to examine.
*/
#if TAGS
if (tagoption != NULL || strcmp(tags, "-") == 0)
{
/*
* A -t option was given.
* Verify that no filenames were also given.
* Edit the file selected by the "tags" search,
* and search for the proper line in the file.
*/
if (nifile() > 0)
{
error("No filenames allowed with -t option", NULL_PARG);
quit(QUIT_ERROR);
}
findtag(tagoption);
if (edit_tagfile()) /* Edit file which contains the tag */
quit(QUIT_ERROR);
/*
* Search for the line which contains the tag.
* Set up initial_scrpos so we display that line.
*/
initial_scrpos.pos = tagsearch();
if (initial_scrpos.pos == NULL_POSITION)
quit(QUIT_ERROR);
initial_scrpos.ln = jump_sline;
} else
#endif
{
if (edit_first())
quit(QUIT_ERROR);
/*
* See if file fits on one screen to decide whether
* to send terminal init. But don't need this
* if -X (no_init) overrides this (see init()).
*/
if (quit_if_one_screen)
{
if (nifile() > 1) /* If more than one file, -F cannot be used */
quit_if_one_screen = FALSE;
else if (!no_init)
one_screen = get_one_screen();
}
}
if (errmsgs > 0)
{
/*
* We displayed some messages on error output
* (file descriptor 2; see flush()).
* Before erasing the screen contents, wait for a keystroke.
*/
less_printf("Press RETURN to continue ", NULL_PARG);
get_return();
putchr('\n');
}
set_output(1);
init();
commands();
quit(QUIT_OK);
/*NOTREACHED*/
return (0);
}
/*
* Copy a string to a "safe" place
* (that is, to a buffer allocated by calloc).
*/
public char * save(constant char *s)
{
char *p;
public void out_of_memory(void)
{
error("Cannot allocate memory", NULL_PARG);
quit(QUIT_ERROR);
}
/*
* Allocate memory.
* Like calloc(), but never returns an error (NULL).
*/
public void * ecalloc(int count, unsigned int size)
{
void * p;
p = (void *) calloc(count, size);
if (p == NULL)
out_of_memory();
return p;
}
/*
* Skip leading spaces in a string.
*/
public char * skipsp(char *s)
{
while (*s == ' ' || *s == '\t')
s++;
return (s);
}
/*
* See how many characters of two strings are identical.
* If uppercase is true, the first string must begin with an uppercase
* character; the remainder of the first string may be either case.
*/
public int sprefix(char *ps, char *s, int uppercase)
{
int c;
int sc;
int len = 0;
for ( ; *s != '\0'; s++, ps++)
{
c = *ps;
if (uppercase)
{
if (len == 0 && ASCII_IS_LOWER(c))
return (-1);
if (ASCII_IS_UPPER(c))
c = ASCII_TO_LOWER(c);
}
sc = *s;
if (len > 0 && ASCII_IS_UPPER(sc))
sc = ASCII_TO_LOWER(sc);
if (c != sc)
break;
len++;
}
return (len);
}
/*
* Exit the program.
*/
public void quit(int status)
{
static int save_status;
/*
* Put cursor at bottom left corner, clear the line,
* reset the terminal modes, and exit.
*/
if (status < 0)
status = save_status;
else
save_status = status;
quitting = 1;
check_altpipe_error();
if (interactive())
clear_bot();
deinit();
flush();
if (redraw_on_quit && term_init_done)
{
/*
* The last file text displayed might have been on an
* alternate screen, which now (since deinit) cannot be seen.
* redraw_on_quit tells us to redraw it on the main screen.
*/
first_time = 1; /* Don't print "skipping" or tildes */
repaint();
flush();
}
edit((char*)NULL);
save_cmdhist();
raw_mode(0);
#if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
/*
* If we don't close 2, we get some garbage from
* 2's buffer when it flushes automatically.
* I cannot track this one down RB
* The same bug shows up if we use ^C^C to abort.
*/
close(2);
#endif
#ifdef WIN32
SetConsoleTitle(consoleTitle);
#endif
close_getchr();
exit(status);
}
