/* $OpenBSD: main.c,v 1.5 2001/11/19 19:02:14 mpech Exp $ */ /* * Copyright (c) 1984,1985,1989,1994,1995 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 more_mode = 0; extern int quit_at_eof; extern int cbufs; extern int errmsgs; extern int screen_trashed; extern int force_open; #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 * tagfile; extern char * tagoption; extern int jump_sline; #endif /* * Entry point. */ int main(argc, argv) int argc; char *argv[]; { IFILE ifile; extern char *__progname; #ifdef __EMX__ _response(&argc, &argv); _wildcard(&argc, &argv); #endif progname = *argv++; /* * Process command line arguments and LESS environment arguments. * Command line arguments override environment arguments. */ if (strcmp(__progname, "more") == 0) more_mode = 1; get_term(); init_cmds(); init_prompt(); init_charset(); init_option(); if (more_mode) { scan_option("-E"); scan_option("-m"); scan_option("-G"); scan_option(getenv("MORE")); } else scan_option(getenv("LESS")); #if GNU_OPTIONS /* * Special case for "less --help" and "less --version". */ if (argc == 2) { if (strcmp(argv[0], "--help") == 0) scan_option("-?"); if (strcmp(argv[0], "--version") == 0) scan_option("-V"); } #endif #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') while (--argc > 0 && (isoptstring(argv[0]) || isoptpending())) { if (strcmp(argv[0], "--") == 0) { argv++; argc--; break; } scan_option(*argv++); } #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 = getenv("VISUAL"); if (editor == NULL || *editor == '\0') { editor = getenv("EDITOR"); if (editor == NULL || *editor == '\0') editor = EDIT_PGM; } editproto = getenv("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; while (--argc >= 0) { #if MSOFTC || 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 = glob(*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. */ is_tty = isatty(1); if (!is_tty) { /* * Output is not a tty. * Just copy the input file(s) to output. */ 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); } 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 (tagfile == NULL) quit(QUIT_ERROR); 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; { 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; { 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) 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 (is_tty && any_display) clear_bot(); deinit(); flush(); raw_mode(0); #if MSOFTC /* * 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 exit(status); }