mirror of
https://github.com/freebsd/freebsd-src
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441 lines
8.8 KiB
C
441 lines
8.8 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 1984-2023 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Entry point, initialization, miscellaneous routines.
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*/
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#include "less.h"
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#if MSDOS_COMPILER==WIN32C
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#endif
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public char * every_first_cmd = NULL;
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public int new_file;
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public int is_tty;
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public IFILE curr_ifile = NULL_IFILE;
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public IFILE old_ifile = NULL_IFILE;
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public struct scrpos initial_scrpos;
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public POSITION start_attnpos = NULL_POSITION;
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public POSITION end_attnpos = NULL_POSITION;
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public int wscroll;
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public char * progname;
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public int quitting;
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public int secure;
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public int dohelp;
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#if LOGFILE
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public int logfile = -1;
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public int force_logfile = FALSE;
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public char * namelogfile = NULL;
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#endif
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#if EDITOR
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public char * editor;
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public char * editproto;
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#endif
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#if TAGS
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extern char * tags;
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extern char * tagoption;
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extern int jump_sline;
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#endif
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#ifdef WIN32
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static char consoleTitle[256];
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#endif
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public int one_screen;
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extern int less_is_more;
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extern int missing_cap;
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extern int know_dumb;
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extern int pr_type;
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extern int quit_if_one_screen;
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extern int no_init;
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extern int errmsgs;
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extern int redraw_on_quit;
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extern int term_init_done;
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extern int first_time;
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/*
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* Entry point.
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*/
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int main(int argc, char *argv[])
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{
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IFILE ifile;
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char *s;
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#ifdef __EMX__
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_response(&argc, &argv);
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_wildcard(&argc, &argv);
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#endif
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progname = *argv++;
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argc--;
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#if SECURE
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secure = 1;
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#else
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secure = 0;
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s = lgetenv("LESSSECURE");
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if (!isnullenv(s))
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secure = 1;
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#endif
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#ifdef WIN32
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if (getenv("HOME") == NULL)
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{
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/*
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* If there is no HOME environment variable,
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* try the concatenation of HOMEDRIVE + HOMEPATH.
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*/
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char *drive = getenv("HOMEDRIVE");
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char *path = getenv("HOMEPATH");
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if (drive != NULL && path != NULL)
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{
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char *env = (char *) ecalloc(strlen(drive) +
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strlen(path) + 6, sizeof(char));
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strcpy(env, "HOME=");
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strcat(env, drive);
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strcat(env, path);
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putenv(env);
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}
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}
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GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
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#endif /* WIN32 */
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/*
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* Process command line arguments and LESS environment arguments.
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* Command line arguments override environment arguments.
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*/
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is_tty = isatty(1);
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init_mark();
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init_cmds();
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init_poll();
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get_term();
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init_charset();
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init_line();
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init_cmdhist();
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init_option();
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init_search();
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/*
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* If the name of the executable program is "more",
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* act like LESS_IS_MORE is set.
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*/
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s = last_component(progname);
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if (strcmp(s, "more") == 0)
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less_is_more = 1;
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init_prompt();
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if (less_is_more)
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scan_option("-fG");
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s = lgetenv(less_is_more ? "MORE" : "LESS");
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if (s != NULL)
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scan_option(s);
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#define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \
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(((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
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while (argc > 0 && (isoptstring(*argv) || isoptpending()))
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{
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s = *argv++;
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argc--;
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if (strcmp(s, "--") == 0)
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break;
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scan_option(s);
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}
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#undef isoptstring
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if (isoptpending())
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{
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/*
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* Last command line option was a flag requiring a
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* following string, but there was no following string.
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*/
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nopendopt();
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quit(QUIT_OK);
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}
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if (less_is_more)
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no_init = TRUE;
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expand_cmd_tables();
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#if EDITOR
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editor = lgetenv("VISUAL");
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if (editor == NULL || *editor == '\0')
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{
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editor = lgetenv("EDITOR");
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if (isnullenv(editor))
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editor = EDIT_PGM;
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}
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editproto = lgetenv("LESSEDIT");
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if (isnullenv(editproto))
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editproto = "%E ?lm+%lm. %g";
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#endif
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/*
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* Call get_ifile with all the command line filenames
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* to "register" them with the ifile system.
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*/
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ifile = NULL_IFILE;
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if (dohelp)
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ifile = get_ifile(FAKE_HELPFILE, ifile);
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while (argc-- > 0)
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{
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#if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
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/*
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* Because the "shell" doesn't expand filename patterns,
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* treat each argument as a filename pattern rather than
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* a single filename.
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* Expand the pattern and iterate over the expanded list.
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*/
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struct textlist tlist;
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char *filename;
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char *gfilename;
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char *qfilename;
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gfilename = lglob(*argv++);
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init_textlist(&tlist, gfilename);
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filename = NULL;
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while ((filename = forw_textlist(&tlist, filename)) != NULL)
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{
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qfilename = shell_unquote(filename);
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(void) get_ifile(qfilename, ifile);
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free(qfilename);
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ifile = prev_ifile(NULL_IFILE);
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}
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free(gfilename);
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#else
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(void) get_ifile(*argv++, ifile);
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ifile = prev_ifile(NULL_IFILE);
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#endif
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}
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/*
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* Set up terminal, etc.
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*/
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if (!is_tty)
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{
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/*
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* Output is not a tty.
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* Just copy the input file(s) to output.
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*/
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set_output(1); /* write to stdout */
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SET_BINARY(1);
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if (edit_first() == 0)
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{
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do {
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cat_file();
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} while (edit_next(1) == 0);
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}
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quit(QUIT_OK);
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}
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if (missing_cap && !know_dumb && !less_is_more)
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error("WARNING: terminal is not fully functional", NULL_PARG);
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open_getchr();
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raw_mode(1);
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init_signals(1);
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/*
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* Select the first file to examine.
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*/
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#if TAGS
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if (tagoption != NULL || strcmp(tags, "-") == 0)
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{
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/*
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* A -t option was given.
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* Verify that no filenames were also given.
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* Edit the file selected by the "tags" search,
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* and search for the proper line in the file.
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*/
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if (nifile() > 0)
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{
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error("No filenames allowed with -t option", NULL_PARG);
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quit(QUIT_ERROR);
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}
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findtag(tagoption);
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if (edit_tagfile()) /* Edit file which contains the tag */
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quit(QUIT_ERROR);
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/*
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* Search for the line which contains the tag.
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* Set up initial_scrpos so we display that line.
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*/
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initial_scrpos.pos = tagsearch();
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if (initial_scrpos.pos == NULL_POSITION)
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quit(QUIT_ERROR);
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initial_scrpos.ln = jump_sline;
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} else
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#endif
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{
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if (edit_first())
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quit(QUIT_ERROR);
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/*
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* See if file fits on one screen to decide whether
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* to send terminal init. But don't need this
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* if -X (no_init) overrides this (see init()).
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*/
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if (quit_if_one_screen)
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{
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if (nifile() > 1) /* If more than one file, -F cannot be used */
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quit_if_one_screen = FALSE;
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else if (!no_init)
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one_screen = get_one_screen();
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}
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}
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if (errmsgs > 0)
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{
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/*
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* We displayed some messages on error output
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* (file descriptor 2; see flush()).
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* Before erasing the screen contents, wait for a keystroke.
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*/
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less_printf("Press RETURN to continue ", NULL_PARG);
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get_return();
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putchr('\n');
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}
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set_output(1);
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init();
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commands();
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quit(QUIT_OK);
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/*NOTREACHED*/
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return (0);
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}
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/*
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* Copy a string to a "safe" place
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* (that is, to a buffer allocated by calloc).
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*/
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public char * save(constant char *s)
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{
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char *p;
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p = (char *) ecalloc(strlen(s)+1, sizeof(char));
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strcpy(p, s);
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return (p);
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}
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public void out_of_memory(void)
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{
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error("Cannot allocate memory", NULL_PARG);
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quit(QUIT_ERROR);
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}
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/*
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* Allocate memory.
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* Like calloc(), but never returns an error (NULL).
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*/
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public void * ecalloc(int count, unsigned int size)
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{
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void * p;
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p = (void *) calloc(count, size);
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if (p == NULL)
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out_of_memory();
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return p;
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}
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/*
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* Skip leading spaces in a string.
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*/
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public char * skipsp(char *s)
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{
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while (*s == ' ' || *s == '\t')
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s++;
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return (s);
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}
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/*
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* See how many characters of two strings are identical.
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* If uppercase is true, the first string must begin with an uppercase
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* character; the remainder of the first string may be either case.
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*/
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public int sprefix(char *ps, char *s, int uppercase)
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{
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int c;
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int sc;
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int len = 0;
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for ( ; *s != '\0'; s++, ps++)
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{
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c = *ps;
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if (uppercase)
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{
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if (len == 0 && ASCII_IS_LOWER(c))
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return (-1);
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if (ASCII_IS_UPPER(c))
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c = ASCII_TO_LOWER(c);
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}
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sc = *s;
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if (len > 0 && ASCII_IS_UPPER(sc))
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sc = ASCII_TO_LOWER(sc);
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if (c != sc)
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break;
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len++;
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}
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return (len);
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}
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/*
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* Exit the program.
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*/
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public void quit(int status)
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{
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static int save_status;
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/*
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* Put cursor at bottom left corner, clear the line,
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* reset the terminal modes, and exit.
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*/
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if (status < 0)
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status = save_status;
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else
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save_status = status;
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quitting = 1;
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check_altpipe_error();
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if (interactive())
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clear_bot();
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deinit();
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flush();
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if (redraw_on_quit && term_init_done)
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{
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/*
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* The last file text displayed might have been on an
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* alternate screen, which now (since deinit) cannot be seen.
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* redraw_on_quit tells us to redraw it on the main screen.
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*/
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first_time = 1; /* Don't print "skipping" or tildes */
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repaint();
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flush();
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}
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edit((char*)NULL);
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save_cmdhist();
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raw_mode(0);
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#if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
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/*
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* If we don't close 2, we get some garbage from
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* 2's buffer when it flushes automatically.
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* I cannot track this one down RB
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* The same bug shows up if we use ^C^C to abort.
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*/
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close(2);
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#endif
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#ifdef WIN32
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SetConsoleTitle(consoleTitle);
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#endif
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close_getchr();
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exit(status);
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}
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