home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
rtsi.com
/
2014.01.www.rtsi.com.tar
/
www.rtsi.com
/
OS9
/
OSK
/
CMDS
/
less_332.lzh
/
less_332
/
main.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-03-03
|
8KB
|
358 lines
/*
* Copyright (c) 1984,1985,1989,1994,1995,1996 Mark Nudelman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Entry point, initialization, miscellaneous routines.
*/
#include "less.h"
#include "position.h"
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 int any_display = FALSE;
public int wscroll;
public char * progname;
public int quitting;
public int secure;
public int dohelp;
#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
#if TAGS
extern char * tagoption;
extern int jump_sline;
#endif
extern int missing_cap;
extern int know_dumb;
/*
* Entry point.
*/
int
main(argc, argv)
int argc;
char *argv[];
{
IFILE ifile;
char *s;
#ifdef __EMX__
_response(&argc, &argv);
_wildcard(&argc, &argv);
#endif
progname = *argv++;
argc--;
secure = 0;
s = lgetenv("LESSSECURE");
if (s != NULL && *s != '\0')
secure = 1;
/*
* Process command line arguments and LESS environment arguments.
* Command line arguments override environment arguments.
*/
is_tty = isatty(1);
get_term();
init_cmds();
init_prompt();
init_charset();
init_option();
scan_option(lgetenv("LESS"));
#if GNU_OPTIONS
/*
* Special case for "less --help" and "less --version".
*/
if (argc == 1)
{
if (strcmp(argv[0], "--help") == 0)
{
scan_option("-?");
argc = 0;
}
if (strcmp(argv[0], "--version") == 0)
{
scan_option("-V");
argc = 0;
}
}
#endif
#define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
while (argc > 0 && (isoptstring(*argv) || isoptpending()))
{
s = *argv++;
argc--;
if (strcmp(s, "--") == 0)
break;
scan_option(s);
}
#undef isoptstring
if (isoptpending())
{
/*
* Last command line option was a flag requiring a
* following string, but there was no following string.
*/
nopendopt();
quit(QUIT_OK);
}
#if EDITOR
editor = lgetenv("VISUAL");
if (editor == NULL || *editor == '\0')
{
editor = lgetenv("EDITOR");
if (editor == NULL || *editor == '\0')
editor = EDIT_PGM;
}
editproto = lgetenv("LESSEDIT");
if (editproto == NULL || *editproto == '\0')
editproto = "%E ?lm+%lm. %f";
#endif
/*
* 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) || OS2
/*
* 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 *gfilename;
char *filename;
gfilename = lglob(*argv++);
init_textlist(&tlist, gfilename);
filename = NULL;
while ((filename = forw_textlist(&tlist, filename)) != NULL)
ifile = get_ifile(filename, ifile);
free(gfilename);
#else
ifile = get_ifile(*argv++, ifile);
#endif
}
/*
* Set up terminal, etc.
*/
if (!is_tty)
{
/*
* Output is not a tty.
* Just copy the input file(s) to output.
*/
SET_BINARY(1);
if (nifile() == 0)
{
if (edit_stdin() == 0)
cat_file();
} else if (edit_first() == 0)
{
do {
cat_file();
} while (edit_next(1) == 0);
}
quit(QUIT_OK);
}
if (missing_cap && !know_dumb)
error("WARNING: terminal is not fully functional", NULL_PARG);
init_mark();
raw_mode(1);
open_getchr();
init_signals(1);
/*
* Select the first file to examine.
*/
#if TAGS
if (tagoption != NULL)
{
/*
* 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 (nifile() == 0)
{
if (edit_stdin()) /* Edit standard input */
quit(QUIT_ERROR);
} else
{
if (edit_first()) /* Edit first valid file in cmd line */
quit(QUIT_ERROR);
}
init();
commands();
quit(QUIT_OK);
/*NOTREACHED*/
}
/*
* Copy a string, truncating to the specified length if necessary.
* Unlike strncpy(), the resulting string is guaranteed to be null-terminated.
*/
public void
strtcpy(to, from, len)
char *to;
char *from;
unsigned int len;
{
strncpy(to, from, len);
to[len-1] = '\0';
}
/*
* Copy a string to a "safe" place
* (that is, to a buffer allocated by calloc).
*/
public char *
save(s)
char *s;
{
register char *p;
p = (char *) ecalloc(strlen(s)+1, sizeof(char));
strcpy(p, s);
return (p);
}
/*
* Allocate memory.
* Like calloc(), but never returns an error (NULL).
*/
public VOID_POINTER
ecalloc(count, size)
int count;
unsigned int size;
{
register VOID_POINTER p;
p = (VOID_POINTER) calloc(count, size);
if (p != NULL)
return (p);
error("Cannot allocate memory", NULL_PARG);
quit(QUIT_ERROR);
/*NOTREACHED*/
}
/*
* Skip leading spaces in a string.
*/
public char *
skipsp(s)
register char *s;
{
while (*s == ' ' || *s == '\t')
s++;
return (s);
}
/*
* Exit the program.
*/
public void
quit(status)
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;
edit((char*)NULL);
if (any_display && is_tty)
clear_bot();
deinit();
flush();
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
close_getchr();
exit(status);
}