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main.c
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main.c
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/*
* 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.
*/
#include "less.h"
#if MSDOS_COMPILER==WIN32C
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#if defined(MINGW) || defined(_MSC_VER)
#include <locale.h>
#include <shellapi.h>
#endif
public unsigned less_acp = CP_ACP;
#endif
public char * every_first_cmd = NULL;
public lbool 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 constant char *progname;
public int quitting;
public int dohelp;
static int secure_allow_features;
#if LOGFILE
public int logfile = -1;
public lbool force_logfile = FALSE;
public char * namelogfile = NULL;
#endif
#if EDITOR
public constant char * editor;
public constant char * editproto;
#endif
#if TAGS
extern char * tags;
extern char * tagoption;
extern int jump_sline;
#endif
#ifdef WIN32
static char consoleTitle[256];
#endif
public int one_screen;
extern int less_is_more;
extern int missing_cap;
extern int know_dumb;
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 MSDOS_COMPILER==WIN32C && (defined(MINGW) || defined(_MSC_VER))
/* malloc'ed 0-terminated utf8 of 0-terminated wide ws, or null on errors */
static char *utf8_from_wide(const wchar_t *ws)
{
char *u8 = NULL;
int n = WideCharToMultiByte(CP_UTF8, 0, ws, -1, NULL, 0, NULL, NULL);
if (n > 0)
{
u8 = ecalloc(n, sizeof(char));
WideCharToMultiByte(CP_UTF8, 0, ws, -1, u8, n, NULL, NULL);
}
return u8;
}
/*
* similar to using UTF8 manifest to make the ANSI APIs UTF8, but dynamically
* with setlocale. unlike the manifest, argv and environ are already ACP, so
* make them UTF8. CP_ACP remains the original codepage - use less_acp instead.
* effective on win 10 1803 or later when compiled with ucrt, else no-op.
*/
static void try_utf8_locale(int *pargc, constant char ***pargv)
{
char *locale_orig = strdup(setlocale(LC_ALL, NULL));
wchar_t **wargv = NULL, *wenv, *wp;
constant char **u8argv;
char *u8e;
int i, n;
if (!setlocale(LC_ALL, ".UTF8"))
goto cleanup; /* not win10 1803+ or not ucrt */
/*
* wargv is before glob expansion. some ucrt builds may expand globs
* before main is entered, so n may be smaller than the original argc.
* that's ok, because later code at main expands globs anyway.
*/
wargv = CommandLineToArgvW(GetCommandLineW(), &n);
if (!wargv)
goto bad_args;
u8argv = (constant char **) ecalloc(n + 1, sizeof(char *));
for (i = 0; i < n; ++i)
{
if (!(u8argv[i] = utf8_from_wide(wargv[i])))
goto bad_args;
}
u8argv[n] = 0;
less_acp = CP_UTF8;
*pargc = n;
*pargv = u8argv; /* leaked on exit */
/* convert wide env to utf8 where we can, but don't abort on errors */
if ((wenv = GetEnvironmentStringsW()))
{
for (wp = wenv; *wp; wp += wcslen(wp) + 1)
{
if ((u8e = utf8_from_wide(wp)))
_putenv(u8e);
free(u8e); /* windows putenv makes a copy */
}
FreeEnvironmentStringsW(wenv);
}
goto cleanup;
bad_args:
error("WARNING: cannot use unicode arguments", NULL_PARG);
setlocale(LC_ALL, locale_orig);
cleanup:
free(locale_orig);
LocalFree(wargv);
}
#endif
static int security_feature_error(constant char *type, size_t len, constant char *name)
{
PARG parg;
size_t msglen = len + strlen(type) + 64;
char *msg = ecalloc(msglen, sizeof(char));
SNPRINTF3(msg, msglen, "LESSSECURE_ALLOW: %s feature name \"%.*s\"", type, (int) len, name);
parg.p_string = msg;
error("%s", &parg);
free(msg);
return 0;
}
/*
* Return the SF_xxx value of a secure feature given the name of the feature.
*/
static int security_feature(constant char *name, size_t len)
{
struct secure_feature { constant char *name; int sf_value; };
static struct secure_feature features[] = {
{ "edit", SF_EDIT },
{ "examine", SF_EXAMINE },
{ "glob", SF_GLOB },
{ "history", SF_HISTORY },
{ "lesskey", SF_LESSKEY },
{ "lessopen", SF_LESSOPEN },
{ "logfile", SF_LOGFILE },
{ "pipe", SF_PIPE },
{ "shell", SF_SHELL },
{ "stop", SF_STOP },
{ "tags", SF_TAGS },
};
int i;
int match = -1;
for (i = 0; i < sizeof(features)/sizeof(*features); i++)
{
if (strncmp(features[i].name, name, len) == 0)
{
if (match >= 0) /* name is ambiguous */
return security_feature_error("ambiguous", len, name);
match = i;
}
}
if (match < 0)
return security_feature_error("invalid", len, name);
return features[match].sf_value;
}
/*
* Set the secure_allow_features bitmask, which controls
* whether certain secure features are allowed.
*/
static void init_secure(void)
{
#if SECURE
secure_allow_features = 0;
#else
constant char *str = lgetenv("LESSSECURE");
if (isnullenv(str))
secure_allow_features = ~0; /* allow everything */
else
secure_allow_features = 0; /* allow nothing */
str = lgetenv("LESSSECURE_ALLOW");
if (!isnullenv(str))
{
for (;;)
{
constant char *estr;
while (*str == ' ' || *str == ',') ++str; /* skip leading spaces/commas */
if (*str == '\0') break;
estr = strchr(str, ',');
if (estr == NULL) estr = str + strlen(str);
while (estr > str && estr[-1] == ' ') --estr; /* trim trailing spaces */
secure_allow_features |= security_feature(str, ptr_diff(estr, str));
str = estr;
}
}
#endif
}
/*
* Entry point.
*/
int main(int argc, constant char *argv[])
{
IFILE ifile;
constant char *s;
#if MSDOS_COMPILER==WIN32C && (defined(MINGW) || defined(_MSC_VER))
if (GetACP() != CP_UTF8) /* not using a UTF-8 manifest */
try_utf8_locale(&argc, &argv);
#endif
#ifdef __EMX__
_response(&argc, &argv);
_wildcard(&argc, &argv);
#endif
progname = *argv++;
argc--;
init_secure();
#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.
*/
is_tty = isatty(1);
init_mark();
init_cmds();
init_poll();
init_charset();
init_line();
init_cmdhist();
init_option();
init_search();
/*
* If the name of the executable program is "more",
* act like LESS_IS_MORE is set.
*/
if (strcmp(last_component(progname), "more") == 0)
less_is_more = 1;
init_prompt();
init_unsupport();
s = lgetenv(less_is_more ? "MORE" : "LESS");
if (s != NULL)
scan_option(s);
#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);
}
get_term();
expand_cmd_tables();
#if EDITOR
editor = lgetenv("VISUAL");
if (editor == NULL || *editor == '\0')
{
editor = lgetenv("EDITOR");
if (isnullenv(editor))
editor = EDIT_PGM;
}
editproto = lgetenv("LESSEDIT");
if (isnullenv(editproto))
editproto = "%E ?lm+%lm. %g";
#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)
/*
* 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;
constant 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)
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;
p = (char *) ecalloc(strlen(s)+1, sizeof(char));
strcpy(p, s);
return (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(size_t count, size_t 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);
}
/* {{ There must be a better way. }} */
public constant char * skipspc(constant 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 size_t sprefix(constant char *ps, constant char *s, int uppercase)
{
char c;
char sc;
size_t len = 0;
for ( ; *s != '\0'; s++, ps++)
{
c = *ps;
if (uppercase)
{
if (len == 0 && ASCII_IS_LOWER(c))
return (0);
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);
}
/*
* Are all the features in the features mask allowed by security?
*/
public int secure_allow(int features)
{
return ((secure_allow_features & features) == features);
}