/* $FreeBSD$ */ /* * Copyright (C) 1984-2022 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. */ /* * User-level command processor. */ #include "less.h" #if MSDOS_COMPILER==WIN32C #include #endif #include "position.h" #include "option.h" #include "cmd.h" extern int erase_char, erase2_char, kill_char; extern int sigs; extern int quit_if_one_screen; extern int squished; extern int sc_width; extern int sc_height; extern char *kent; extern int swindow; extern int jump_sline; extern int quitting; extern int wscroll; extern int top_scroll; extern int ignore_eoi; extern int secure; extern int hshift; extern int bs_mode; extern int show_attn; extern int less_is_more; extern int status_col; extern POSITION highest_hilite; extern POSITION start_attnpos; extern POSITION end_attnpos; extern char *every_first_cmd; extern char version[]; extern struct scrpos initial_scrpos; extern IFILE curr_ifile; extern void *ml_search; extern void *ml_examine; extern int wheel_lines; extern int header_lines; extern int def_search_type; extern int updown_match; #if SHELL_ESCAPE || PIPEC extern void *ml_shell; #endif #if EDITOR extern char *editor; extern char *editproto; #endif extern int screen_trashed; /* The screen has been overwritten */ extern int shift_count; extern int oldbot; extern int forw_prompt; extern int incr_search; #if MSDOS_COMPILER==WIN32C extern int utf_mode; #endif #if SHELL_ESCAPE static char *shellcmd = NULL; /* For holding last shell command for "!!" */ #endif static int mca; /* The multicharacter command (action) */ static int search_type; /* The previous type of search */ static LINENUM number; /* The number typed by the user */ static long fraction; /* The fractional part of the number */ static struct loption *curropt; static int opt_lower; static int optflag; static int optgetname; static POSITION bottompos; static int save_hshift; static int save_bs_mode; #if PIPEC static char pipec; #endif /* Stack of ungotten chars (via ungetcc) */ struct ungot { struct ungot *ug_next; LWCHAR ug_char; }; static struct ungot* ungot = NULL; static void multi_search LESSPARAMS((char *pattern, int n, int silent)); /* * Move the cursor to start of prompt line before executing a command. * This looks nicer if the command takes a long time before * updating the screen. */ static void cmd_exec(VOID_PARAM) { clear_attn(); clear_bot(); flush(); } /* * Indicate we are reading a multi-character command. */ static void set_mca(action) int action; { mca = action; clear_bot(); clear_cmd(); } /* * Indicate we are not reading a multi-character command. */ static void clear_mca(VOID_PARAM) { if (mca == 0) return; mca = 0; } /* * Set up the display to start a new multi-character command. */ static void start_mca(action, prompt, mlist, cmdflags) int action; constant char *prompt; void *mlist; int cmdflags; { set_mca(action); cmd_putstr(prompt); set_mlist(mlist, cmdflags); } public int in_mca(VOID_PARAM) { return (mca != 0 && mca != A_PREFIX); } /* * Set up the display to start a new search command. */ static void mca_search1(VOID_PARAM) { #if HILITE_SEARCH if (search_type & SRCH_FILTER) set_mca(A_FILTER); else #endif if (search_type & SRCH_FORW) set_mca(A_F_SEARCH); else set_mca(A_B_SEARCH); if (search_type & SRCH_NO_MATCH) cmd_putstr("Non-match "); if (search_type & SRCH_FIRST_FILE) cmd_putstr("First-file "); if (search_type & SRCH_PAST_EOF) cmd_putstr("EOF-ignore "); if (search_type & SRCH_NO_MOVE) cmd_putstr("Keep-pos "); if (search_type & SRCH_NO_REGEX) cmd_putstr("Regex-off "); if (search_type & SRCH_WRAP) cmd_putstr("Wrap "); #if HILITE_SEARCH if (search_type & SRCH_FILTER) cmd_putstr("&/"); else #endif if (search_type & SRCH_FORW) cmd_putstr("/"); else cmd_putstr("?"); forw_prompt = 0; } static void mca_search(VOID_PARAM) { mca_search1(); set_mlist(ml_search, 0); } /* * Set up the display to start a new toggle-option command. */ static void mca_opt_toggle(VOID_PARAM) { int no_prompt; int flag; char *dash; no_prompt = (optflag & OPT_NO_PROMPT); flag = (optflag & ~OPT_NO_PROMPT); dash = (flag == OPT_NO_TOGGLE) ? "_" : "-"; set_mca(A_OPT_TOGGLE); cmd_putstr(dash); if (optgetname) cmd_putstr(dash); if (no_prompt) cmd_putstr("(P)"); switch (flag) { case OPT_UNSET: cmd_putstr("+"); break; case OPT_SET: cmd_putstr("!"); break; } forw_prompt = 0; set_mlist(NULL, 0); } /* * Execute a multicharacter command. */ static void exec_mca(VOID_PARAM) { char *cbuf; cmd_exec(); cbuf = get_cmdbuf(); if (cbuf == NULL) return; switch (mca) { case A_F_SEARCH: case A_B_SEARCH: multi_search(cbuf, (int) number, 0); break; #if HILITE_SEARCH case A_FILTER: search_type ^= SRCH_NO_MATCH; set_filter_pattern(cbuf, search_type); break; #endif case A_FIRSTCMD: /* * Skip leading spaces or + signs in the string. */ while (*cbuf == '+' || *cbuf == ' ') cbuf++; if (every_first_cmd != NULL) free(every_first_cmd); if (*cbuf == '\0') every_first_cmd = NULL; else every_first_cmd = save(cbuf); break; case A_OPT_TOGGLE: toggle_option(curropt, opt_lower, cbuf, optflag); curropt = NULL; break; case A_F_BRACKET: match_brac(cbuf[0], cbuf[1], 1, (int) number); break; case A_B_BRACKET: match_brac(cbuf[1], cbuf[0], 0, (int) number); break; #if EXAMINE case A_EXAMINE: if (secure) break; edit_list(cbuf); #if TAGS /* If tag structure is loaded then clean it up. */ cleantags(); #endif break; #endif #if SHELL_ESCAPE case A_SHELL: /* * !! just uses whatever is in shellcmd. * Otherwise, copy cmdbuf to shellcmd, * expanding any special characters ("%" or "#"). */ if (*cbuf != '!') { if (shellcmd != NULL) free(shellcmd); shellcmd = fexpand(cbuf); } if (secure) break; if (shellcmd == NULL) lsystem("", "!done"); else lsystem(shellcmd, "!done"); break; #endif #if PIPEC case A_PIPE: if (secure) break; (void) pipe_mark(pipec, cbuf); error("|done", NULL_PARG); break; #endif } } /* * Is a character an erase or kill char? */ static int is_erase_char(c) int c; { return (c == erase_char || c == erase2_char || c == kill_char); } /* * Is a character a carriage return or newline? */ static int is_newline_char(c) int c; { return (c == '\n' || c == '\r'); } /* * Handle the first char of an option (after the initial dash). */ static int mca_opt_first_char(c) int c; { int no_prompt = (optflag & OPT_NO_PROMPT); int flag = (optflag & ~OPT_NO_PROMPT); if (flag == OPT_NO_TOGGLE) { switch (c) { case '_': /* "__" = long option name. */ optgetname = TRUE; mca_opt_toggle(); return (MCA_MORE); } } else { switch (c) { case '+': /* "-+" = UNSET. */ optflag = no_prompt | ((flag == OPT_UNSET) ? OPT_TOGGLE : OPT_UNSET); mca_opt_toggle(); return (MCA_MORE); case '!': /* "-!" = SET */ optflag = no_prompt | ((flag == OPT_SET) ? OPT_TOGGLE : OPT_SET); mca_opt_toggle(); return (MCA_MORE); case CONTROL('P'): optflag ^= OPT_NO_PROMPT; mca_opt_toggle(); return (MCA_MORE); case '-': /* "--" = long option name. */ optgetname = TRUE; mca_opt_toggle(); return (MCA_MORE); } } /* Char was not handled here. */ return (NO_MCA); } /* * Add a char to a long option name. * See if we've got a match for an option name yet. * If so, display the complete name and stop * accepting chars until user hits RETURN. */ static int mca_opt_nonfirst_char(c) int c; { char *p; char *oname; int err; if (curropt != NULL) { /* * Already have a match for the name. * Don't accept anything but erase/kill. */ if (is_erase_char(c)) return (MCA_DONE); return (MCA_MORE); } /* * Add char to cmd buffer and try to match * the option name. */ if (cmd_char(c) == CC_QUIT) return (MCA_DONE); p = get_cmdbuf(); if (p == NULL) return (MCA_MORE); opt_lower = ASCII_IS_LOWER(p[0]); err = 0; curropt = findopt_name(&p, &oname, &err); if (curropt != NULL) { /* * Got a match. * Remember the option and * display the full option name. */ cmd_reset(); mca_opt_toggle(); for (p = oname; *p != '\0'; p++) { c = *p; if (!opt_lower && ASCII_IS_LOWER(c)) c = ASCII_TO_UPPER(c); if (cmd_char(c) != CC_OK) return (MCA_DONE); } } else if (err != OPT_AMBIG) { bell(); } return (MCA_MORE); } /* * Handle a char of an option toggle command. */ static int mca_opt_char(c) int c; { PARG parg; /* * This may be a short option (single char), * or one char of a long option name, * or one char of the option parameter. */ if (curropt == NULL && len_cmdbuf() == 0) { int ret = mca_opt_first_char(c); if (ret != NO_MCA) return (ret); } if (optgetname) { /* We're getting a long option name. */ if (!is_newline_char(c) && c != '=') return (mca_opt_nonfirst_char(c)); if (curropt == NULL) { parg.p_string = get_cmdbuf(); if (parg.p_string == NULL) return (MCA_MORE); error("There is no --%s option", &parg); return (MCA_DONE); } optgetname = FALSE; cmd_reset(); } else { if (is_erase_char(c)) return (NO_MCA); if (curropt != NULL) /* We're getting the option parameter. */ return (NO_MCA); curropt = findopt(c); if (curropt == NULL) { parg.p_string = propt(c); error("There is no %s option", &parg); return (MCA_DONE); } opt_lower = ASCII_IS_LOWER(c); } /* * If the option which was entered does not take a * parameter, toggle the option immediately, * so user doesn't have to hit RETURN. */ if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE || !opt_has_param(curropt)) { toggle_option(curropt, opt_lower, "", optflag); return (MCA_DONE); } /* * Display a prompt appropriate for the option parameter. */ start_mca(A_OPT_TOGGLE, opt_prompt(curropt), (void*)NULL, 0); return (MCA_MORE); } /* * Normalize search type. */ public int norm_search_type(st) int st; { /* WRAP and PAST_EOF are mutually exclusive. */ if ((st & (SRCH_PAST_EOF|SRCH_WRAP)) == (SRCH_PAST_EOF|SRCH_WRAP)) st ^= SRCH_PAST_EOF; return st; } /* * Handle a char of a search command. */ static int mca_search_char(c) int c; { int flag = 0; /* * Certain characters as the first char of * the pattern have special meaning: * ! Toggle the NO_MATCH flag * * Toggle the PAST_EOF flag * @ Toggle the FIRST_FILE flag */ if (len_cmdbuf() > 0) return (NO_MCA); switch (c) { case '*': if (less_is_more) break; case CONTROL('E'): /* ignore END of file */ if (mca != A_FILTER) flag = SRCH_PAST_EOF; break; case '@': if (less_is_more) break; case CONTROL('F'): /* FIRST file */ if (mca != A_FILTER) flag = SRCH_FIRST_FILE; break; case CONTROL('K'): /* KEEP position */ if (mca != A_FILTER) flag = SRCH_NO_MOVE; break; case CONTROL('W'): /* WRAP around */ if (mca != A_FILTER) flag = SRCH_WRAP; break; case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */ flag = SRCH_NO_REGEX; break; case CONTROL('N'): /* NOT match */ case '!': flag = SRCH_NO_MATCH; break; } if (flag != 0) { search_type = norm_search_type(search_type ^ flag); mca_search(); return (MCA_MORE); } return (NO_MCA); } /* * Handle a character of a multi-character command. */ static int mca_char(c) int c; { int ret; switch (mca) { case 0: /* * We're not in a multicharacter command. */ return (NO_MCA); case A_PREFIX: /* * In the prefix of a command. * This not considered a multichar command * (even tho it uses cmdbuf, etc.). * It is handled in the commands() switch. */ return (NO_MCA); case A_DIGIT: /* * Entering digits of a number. * Terminated by a non-digit. */ if ((c >= '0' && c <= '9') || c == '.') break; switch (editchar(c, ECF_PEEK|ECF_NOHISTORY|ECF_NOCOMPLETE|ECF_NORIGHTLEFT)) { case A_NOACTION: /* * Ignore this char and get another one. */ return (MCA_MORE); case A_INVALID: /* * Not part of the number. * End the number and treat this char * as a normal command character. */ number = cmd_int(&fraction); clear_mca(); cmd_accept(); return (NO_MCA); } break; case A_OPT_TOGGLE: ret = mca_opt_char(c); if (ret != NO_MCA) return (ret); break; case A_F_SEARCH: case A_B_SEARCH: case A_FILTER: ret = mca_search_char(c); if (ret != NO_MCA) return (ret); break; default: /* Other multicharacter command. */ break; } /* * The multichar command is terminated by a newline. */ if (is_newline_char(c)) { /* * Execute the command. */ exec_mca(); return (MCA_DONE); } /* * Append the char to the command buffer. */ if (cmd_char(c) == CC_QUIT) /* * Abort the multi-char command. */ return (MCA_DONE); switch (mca) { case A_F_BRACKET: case A_B_BRACKET: if (len_cmdbuf() >= 2) { /* * Special case for the bracket-matching commands. * Execute the command after getting exactly two * characters from the user. */ exec_mca(); return (MCA_DONE); } break; case A_F_SEARCH: case A_B_SEARCH: if (incr_search) { /* Incremental search: do a search after every input char. */ int st = (search_type & (SRCH_FORW|SRCH_BACK|SRCH_NO_MATCH|SRCH_NO_REGEX|SRCH_NO_MOVE|SRCH_WRAP)); char *pattern = get_cmdbuf(); if (pattern == NULL) return (MCA_MORE); /* * Must save updown_match because mca_search * reinits it. That breaks history scrolling. * {{ This is ugly. mca_search probably shouldn't call set_mlist. }} */ int save_updown_match = updown_match; cmd_exec(); if (*pattern == '\0') { /* User has backspaced to an empty pattern. */ undo_search(1); } else { if (search(st | SRCH_INCR, pattern, 1) != 0) /* No match, invalid pattern, etc. */ undo_search(1); } /* Redraw the search prompt and search string. */ mca_search1(); updown_match = save_updown_match; cmd_repaint(NULL); } break; } /* * Need another character. */ return (MCA_MORE); } /* * Discard any buffered file data. */ static void clear_buffers(VOID_PARAM) { if (!(ch_getflags() & CH_CANSEEK)) return; ch_flush(); clr_linenum(); #if HILITE_SEARCH clr_hilite(); #endif } /* * Make sure the screen is displayed. */ static void make_display(VOID_PARAM) { /* * If nothing is displayed yet, display starting from initial_scrpos. */ if (empty_screen()) { if (initial_scrpos.pos == NULL_POSITION) jump_loc(ch_zero(), 1); else jump_loc(initial_scrpos.pos, initial_scrpos.ln); } else if (screen_trashed) { int save_top_scroll = top_scroll; int save_ignore_eoi = ignore_eoi; top_scroll = 1; ignore_eoi = 0; if (screen_trashed == 2) { /* Special case used by ignore_eoi: re-open the input file * and jump to the end of the file. */ reopen_curr_ifile(); jump_forw(); } repaint(); top_scroll = save_top_scroll; ignore_eoi = save_ignore_eoi; } } /* * Display the appropriate prompt. */ static void prompt(VOID_PARAM) { constant char *p; if (ungot != NULL && ungot->ug_char != CHAR_END_COMMAND) { /* * No prompt necessary if commands are from * ungotten chars rather than from the user. */ return; } /* * Make sure the screen is displayed. */ make_display(); bottompos = position(BOTTOM_PLUS_ONE); /* * If we've hit EOF on the last file and the -E flag is set, quit. */ if (get_quit_at_eof() == OPT_ONPLUS && eof_displayed() && !(ch_getflags() & CH_HELPFILE) && next_ifile(curr_ifile) == NULL_IFILE) quit(QUIT_OK); /* * If the entire file is displayed and the -F flag is set, quit. */ if (quit_if_one_screen && entire_file_displayed() && !(ch_getflags() & CH_HELPFILE) && next_ifile(curr_ifile) == NULL_IFILE) quit(QUIT_OK); quit_if_one_screen = FALSE; /* only get one chance at this */ #if MSDOS_COMPILER==WIN32C /* * In Win32, display the file name in the window title. */ if (!(ch_getflags() & CH_HELPFILE)) { WCHAR w[MAX_PATH+16]; p = pr_expand("Less?f - %f."); MultiByteToWideChar(CP_ACP, 0, p, -1, w, sizeof(w)/sizeof(*w)); SetConsoleTitleW(w); } #endif /* * Select the proper prompt and display it. */ /* * If the previous action was a forward movement, * don't clear the bottom line of the display; * just print the prompt since the forward movement guarantees * that we're in the right position to display the prompt. * Clearing the line could cause a problem: for example, if the last * line displayed ended at the right screen edge without a newline, * then clearing would clear the last displayed line rather than * the prompt line. */ if (!forw_prompt) clear_bot(); clear_cmd(); forw_prompt = 0; p = pr_string(); #if HILITE_SEARCH if (is_filtering()) putstr("& "); #endif if (p == NULL || *p == '\0') { at_enter(AT_NORMAL|AT_COLOR_PROMPT); putchr(':'); at_exit(); } else { #if MSDOS_COMPILER==WIN32C WCHAR w[MAX_PATH*2]; char a[MAX_PATH*2]; MultiByteToWideChar(CP_ACP, 0, p, -1, w, sizeof(w)/sizeof(*w)); WideCharToMultiByte(utf_mode ? CP_UTF8 : GetConsoleOutputCP(), 0, w, -1, a, sizeof(a), NULL, NULL); p = a; #endif load_line(p); put_line(); } clear_eol(); } /* * Display the less version message. */ public void dispversion(VOID_PARAM) { PARG parg; parg.p_string = version; error("less %s", &parg); } /* * Return a character to complete a partial command, if possible. */ static LWCHAR getcc_end_command(VOID_PARAM) { switch (mca) { case A_DIGIT: /* We have a number but no command. Treat as #g. */ return ('g'); case A_F_SEARCH: case A_B_SEARCH: /* We have "/string" but no newline. Add the \n. */ return ('\n'); default: /* Some other incomplete command. Let user complete it. */ return ((ungot == NULL) ? getchr() : 0); } } /* * Get command character. * The character normally comes from the keyboard, * but may come from ungotten characters * (characters previously given to ungetcc or ungetsc). */ static LWCHAR getccu(VOID_PARAM) { LWCHAR c = 0; while (c == 0) { if (ungot == NULL) { /* Normal case: no ungotten chars. * Get char from the user. */ c = getchr(); } else { /* Ungotten chars available: * Take the top of stack (most recent). */ struct ungot *ug = ungot; c = ug->ug_char; ungot = ug->ug_next; free(ug); if (c == CHAR_END_COMMAND) c = getcc_end_command(); } } return (c); } /* * Get a command character, but if we receive the orig sequence, * convert it to the repl sequence. */ static LWCHAR getcc_repl(orig, repl, gr_getc, gr_ungetc) char constant* orig; char constant* repl; LWCHAR (*gr_getc)(VOID_PARAM); void (*gr_ungetc)(LWCHAR); { LWCHAR c; LWCHAR keys[16]; int ki = 0; c = (*gr_getc)(); if (orig == NULL || orig[0] == '\0') return c; for (;;) { keys[ki] = c; if (c != orig[ki] || ki >= sizeof(keys)-1) { /* This is not orig we have been receiving. * If we have stashed chars in keys[], * unget them and return the first one. */ while (ki > 0) (*gr_ungetc)(keys[ki--]); return keys[0]; } if (orig[++ki] == '\0') { /* We've received the full orig sequence. * Return the repl sequence. */ ki = strlen(repl)-1; while (ki > 0) (*gr_ungetc)(repl[ki--]); return repl[0]; } /* We've received a partial orig sequence (ki chars of it). * Get next char and see if it continues to match orig. */ c = (*gr_getc)(); } } /* * Get command character. */ public int getcc(VOID_PARAM) { /* Replace kent (keypad Enter) with a newline. */ return getcc_repl(kent, "\n", getccu, ungetcc); } /* * "Unget" a command character. * The next getcc() will return this character. */ public void ungetcc(c) LWCHAR c; { struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot)); ug->ug_char = c; ug->ug_next = ungot; ungot = ug; } /* * "Unget" a command character. * If any other chars are already ungotten, put this one after those. */ public void ungetcc_back(c) LWCHAR c; { struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot)); ug->ug_char = c; ug->ug_next = NULL; if (ungot == NULL) ungot = ug; else { struct ungot *pu; for (pu = ungot; pu->ug_next != NULL; pu = pu->ug_next) continue; pu->ug_next = ug; } } /* * Unget a whole string of command characters. * The next sequence of getcc()'s will return this string. */ public void ungetsc(s) char *s; { while (*s != '\0') ungetcc_back(*s++); } /* * Peek the next command character, without consuming it. */ public LWCHAR peekcc(VOID_PARAM) { LWCHAR c = getcc(); ungetcc(c); return c; } /* * Search for a pattern, possibly in multiple files. * If SRCH_FIRST_FILE is set, begin searching at the first file. * If SRCH_PAST_EOF is set, continue the search thru multiple files. */ static void multi_search(pattern, n, silent) char *pattern; int n; int silent; { int nomore; IFILE save_ifile; int changed_file; changed_file = 0; save_ifile = save_curr_ifile(); if (search_type & SRCH_FIRST_FILE) { /* * Start at the first (or last) file * in the command line list. */ if (search_type & SRCH_FORW) nomore = edit_first(); else nomore = edit_last(); if (nomore) { unsave_ifile(save_ifile); return; } changed_file = 1; search_type &= ~SRCH_FIRST_FILE; } for (;;) { n = search(search_type, pattern, n); /* * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared * after being used once. This allows "n" to work after * using a /@@ search. */ search_type &= ~SRCH_NO_MOVE; if (n == 0) { /* * Found it. */ unsave_ifile(save_ifile); return; } if (n < 0) /* * Some kind of error in the search. * Error message has been printed by search(). */ break; if ((search_type & SRCH_PAST_EOF) == 0) /* * We didn't find a match, but we're * supposed to search only one file. */ break; /* * Move on to the next file. */ if (search_type & SRCH_FORW) nomore = edit_next(1); else nomore = edit_prev(1); if (nomore) break; changed_file = 1; } /* * Didn't find it. * Print an error message if we haven't already. */ if (n > 0 && !silent) error("Pattern not found", NULL_PARG); if (changed_file) { /* * Restore the file we were originally viewing. */ reedit_ifile(save_ifile); } else { unsave_ifile(save_ifile); } } /* * Forward forever, or until a highlighted line appears. */ static int forw_loop(until_hilite) int until_hilite; { POSITION curr_len; if (ch_getflags() & CH_HELPFILE) return (A_NOACTION); cmd_exec(); jump_forw_buffered(); curr_len = ch_length(); highest_hilite = until_hilite ? curr_len : NULL_POSITION; ignore_eoi = 1; while (!sigs) { if (until_hilite && highest_hilite > curr_len) { bell(); break; } make_display(); forward(1, 0, 0); } ignore_eoi = 0; ch_set_eof(); /* * This gets us back in "F mode" after processing * a non-abort signal (e.g. window-change). */ if (sigs && !ABORT_SIGS()) return (until_hilite ? A_F_UNTIL_HILITE : A_F_FOREVER); return (A_NOACTION); } /* * Main command processor. * Accept and execute commands until a quit command. */ public void commands(VOID_PARAM) { int c; int action; char *cbuf; int newaction; int save_jump_sline; int save_search_type; char *extra; char tbuf[2]; PARG parg; IFILE old_ifile; IFILE new_ifile; char *tagfile; search_type = SRCH_FORW; wscroll = (sc_height + 1) / 2; newaction = A_NOACTION; for (;;) { clear_mca(); cmd_accept(); number = 0; curropt = NULL; /* * See if any signals need processing. */ if (sigs) { psignals(); if (quitting) quit(QUIT_SAVED_STATUS); } /* * See if window size changed, for systems that don't * generate SIGWINCH. */ check_winch(); /* * Display prompt and accept a character. */ cmd_reset(); prompt(); if (sigs) continue; if (newaction == A_NOACTION) c = getcc(); again: if (sigs) continue; if (newaction != A_NOACTION) { action = newaction; newaction = A_NOACTION; } else { /* * If we are in a multicharacter command, call mca_char. * Otherwise we call fcmd_decode to determine the * action to be performed. */ if (mca) switch (mca_char(c)) { case MCA_MORE: /* * Need another character. */ c = getcc(); goto again; case MCA_DONE: /* * Command has been handled by mca_char. * Start clean with a prompt. */ continue; case NO_MCA: /* * Not a multi-char command * (at least, not anymore). */ break; } /* * Decode the command character and decide what to do. */ if (mca) { /* * We're in a multichar command. * Add the character to the command buffer * and display it on the screen. * If the user backspaces past the start * of the line, abort the command. */ if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0) continue; cbuf = get_cmdbuf(); if (cbuf == NULL) continue; } else { /* * Don't use cmd_char if we're starting fresh * at the beginning of a command, because we * don't want to echo the command until we know * it is a multichar command. We also don't * want erase_char/kill_char to be treated * as line editing characters. */ tbuf[0] = c; tbuf[1] = '\0'; cbuf = tbuf; } extra = NULL; action = fcmd_decode(cbuf, &extra); /* * If an "extra" string was returned, * process it as a string of command characters. */ if (extra != NULL) ungetsc(extra); } /* * Clear the cmdbuf string. * (But not if we're in the prefix of a command, * because the partial command string is kept there.) */ if (action != A_PREFIX) cmd_reset(); switch (action) { case A_DIGIT: /* * First digit of a number. */ start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE); goto again; case A_F_WINDOW: /* * Forward one window (and set the window size). */ if (number > 0) swindow = (int) number; /* FALLTHRU */ case A_F_SCREEN: /* * Forward one screen. */ if (number <= 0) number = get_swindow(); cmd_exec(); if (show_attn) set_attnpos(bottompos); forward((int) number, 0, 1); break; case A_B_WINDOW: /* * Backward one window (and set the window size). */ if (number > 0) swindow = (int) number; /* FALLTHRU */ case A_B_SCREEN: /* * Backward one screen. */ if (number <= 0) number = get_swindow(); cmd_exec(); backward((int) number, 0, 1); break; case A_F_LINE: /* * Forward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); if (show_attn == OPT_ONPLUS && number > 1) set_attnpos(bottompos); forward((int) number, 0, 0); break; case A_B_LINE: /* * Backward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); backward((int) number, 0, 0); break; case A_F_MOUSE: /* * Forward wheel_lines lines. */ cmd_exec(); forward(wheel_lines, 0, 0); break; case A_B_MOUSE: /* * Backward wheel_lines lines. */ cmd_exec(); backward(wheel_lines, 0, 0); break; case A_FF_LINE: /* * Force forward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); if (show_attn == OPT_ONPLUS && number > 1) set_attnpos(bottompos); forward((int) number, 1, 0); break; case A_BF_LINE: /* * Force backward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); backward((int) number, 1, 0); break; case A_FF_SCREEN: /* * Force forward one screen. */ if (number <= 0) number = get_swindow(); cmd_exec(); if (show_attn == OPT_ONPLUS) set_attnpos(bottompos); forward((int) number, 1, 0); break; case A_F_FOREVER: /* * Forward forever, ignoring EOF. */ if (show_attn) set_attnpos(bottompos); newaction = forw_loop(0); break; case A_F_UNTIL_HILITE: newaction = forw_loop(1); break; case A_F_SCROLL: /* * Forward N lines * (default same as last 'd' or 'u' command). */ if (number > 0) wscroll = (int) number; cmd_exec(); if (show_attn == OPT_ONPLUS) set_attnpos(bottompos); forward(wscroll, 0, 0); break; case A_B_SCROLL: /* * Forward N lines * (default same as last 'd' or 'u' command). */ if (number > 0) wscroll = (int) number; cmd_exec(); backward(wscroll, 0, 0); break; case A_FREPAINT: /* * Flush buffers, then repaint screen. * Don't flush the buffers on a pipe! */ clear_buffers(); /* FALLTHRU */ case A_REPAINT: /* * Repaint screen. */ cmd_exec(); repaint(); break; case A_GOLINE: /* * Go to line N, default beginning of file. * If N <= 0, ignore jump_sline in order to avoid * empty lines before the beginning of the file. */ save_jump_sline = jump_sline; if (number <= 0) { number = 1; jump_sline = 0; } cmd_exec(); jump_back(number); jump_sline = save_jump_sline; break; case A_PERCENT: /* * Go to a specified percentage into the file. */ if (number < 0) { number = 0; fraction = 0; } if (number > 100 || (number == 100 && fraction != 0)) { number = 100; fraction = 0; } cmd_exec(); jump_percent((int) number, fraction); break; case A_GOEND: /* * Go to line N, default end of file. */ cmd_exec(); if (number <= 0) jump_forw(); else jump_back(number); break; case A_GOEND_BUF: /* * Go to line N, default last buffered byte. */ cmd_exec(); if (number <= 0) jump_forw_buffered(); else jump_back(number); break; case A_GOPOS: /* * Go to a specified byte position in the file. */ cmd_exec(); if (number < 0) number = 0; jump_line_loc((POSITION) number, jump_sline); break; case A_STAT: /* * Print file name, etc. */ if (ch_getflags() & CH_HELPFILE) break; cmd_exec(); parg.p_string = eq_message(); error("%s", &parg); break; case A_VERSION: /* * Print version number. */ cmd_exec(); dispversion(); break; case A_QUIT: /* * Exit. */ if (curr_ifile != NULL_IFILE && ch_getflags() & CH_HELPFILE) { /* * Quit while viewing the help file * just means return to viewing the * previous file. */ hshift = save_hshift; bs_mode = save_bs_mode; if (edit_prev(1) == 0) break; } if (extra != NULL) quit(*extra); quit(QUIT_OK); break; /* * Define abbreviation for a commonly used sequence below. */ #define DO_SEARCH() \ if (number <= 0) number = 1; \ mca_search(); \ cmd_exec(); \ multi_search((char *)NULL, (int) number, 0); case A_F_SEARCH: /* * Search forward for a pattern. * Get the first char of the pattern. */ search_type = SRCH_FORW | def_search_type; if (number <= 0) number = 1; mca_search(); c = getcc(); goto again; case A_B_SEARCH: /* * Search backward for a pattern. * Get the first char of the pattern. */ search_type = SRCH_BACK | def_search_type; if (number <= 0) number = 1; mca_search(); c = getcc(); goto again; case A_FILTER: #if HILITE_SEARCH search_type = SRCH_FORW | SRCH_FILTER; mca_search(); c = getcc(); goto again; #else error("Command not available", NULL_PARG); break; #endif case A_AGAIN_SEARCH: /* * Repeat previous search. */ DO_SEARCH(); break; case A_T_AGAIN_SEARCH: /* * Repeat previous search, multiple files. */ search_type |= SRCH_PAST_EOF; DO_SEARCH(); break; case A_REVERSE_SEARCH: /* * Repeat previous search, in reverse direction. */ save_search_type = search_type; search_type = SRCH_REVERSE(search_type); DO_SEARCH(); search_type = save_search_type; break; case A_T_REVERSE_SEARCH: /* * Repeat previous search, * multiple files in reverse direction. */ save_search_type = search_type; search_type = SRCH_REVERSE(search_type); search_type |= SRCH_PAST_EOF; DO_SEARCH(); search_type = save_search_type; break; case A_UNDO_SEARCH: case A_CLR_SEARCH: /* * Clear search string highlighting. */ undo_search(action == A_CLR_SEARCH); break; case A_HELP: /* * Help. */ if (ch_getflags() & CH_HELPFILE) break; cmd_exec(); save_hshift = hshift; hshift = 0; save_bs_mode = bs_mode; bs_mode = BS_SPECIAL; (void) edit(FAKE_HELPFILE); break; case A_EXAMINE: /* * Edit a new file. Get the filename. */ #if EXAMINE if (!secure) { start_mca(A_EXAMINE, "Examine: ", ml_examine, 0); c = getcc(); goto again; } #endif error("Command not available", NULL_PARG); break; case A_VISUAL: /* * Invoke an editor on the input file. */ #if EDITOR if (!secure) { if (ch_getflags() & CH_HELPFILE) break; if (strcmp(get_filename(curr_ifile), "-") == 0) { error("Cannot edit standard input", NULL_PARG); break; } if (get_altfilename(curr_ifile) != NULL) { error("WARNING: This file was viewed via LESSOPEN", NULL_PARG); } start_mca(A_SHELL, "!", ml_shell, 0); /* * Expand the editor prototype string * and pass it to the system to execute. * (Make sure the screen is displayed so the * expansion of "+%lm" works.) */ make_display(); cmd_exec(); lsystem(pr_expand(editproto), (char*)NULL); break; } #endif error("Command not available", NULL_PARG); break; case A_NEXT_FILE: /* * Examine next file. */ #if TAGS if (ntags()) { error("No next file", NULL_PARG); break; } #endif if (number <= 0) number = 1; if (edit_next((int) number)) { if (get_quit_at_eof() && eof_displayed() && !(ch_getflags() & CH_HELPFILE)) quit(QUIT_OK); parg.p_string = (number > 1) ? "(N-th) " : ""; error("No %snext file", &parg); } break; case A_PREV_FILE: /* * Examine previous file. */ #if TAGS if (ntags()) { error("No previous file", NULL_PARG); break; } #endif if (number <= 0) number = 1; if (edit_prev((int) number)) { parg.p_string = (number > 1) ? "(N-th) " : ""; error("No %sprevious file", &parg); } break; case A_NEXT_TAG: /* * Jump to the next tag in the current tag list. */ #if TAGS if (number <= 0) number = 1; tagfile = nexttag((int) number); if (tagfile == NULL) { error("No next tag", NULL_PARG); break; } cmd_exec(); if (edit(tagfile) == 0) { POSITION pos = tagsearch(); if (pos != NULL_POSITION) jump_loc(pos, jump_sline); } #else error("Command not available", NULL_PARG); #endif break; case A_PREV_TAG: /* * Jump to the previous tag in the current tag list. */ #if TAGS if (number <= 0) number = 1; tagfile = prevtag((int) number); if (tagfile == NULL) { error("No previous tag", NULL_PARG); break; } cmd_exec(); if (edit(tagfile) == 0) { POSITION pos = tagsearch(); if (pos != NULL_POSITION) jump_loc(pos, jump_sline); } #else error("Command not available", NULL_PARG); #endif break; case A_INDEX_FILE: /* * Examine a particular file. */ if (number <= 0) number = 1; if (edit_index((int) number)) error("No such file", NULL_PARG); break; case A_REMOVE_FILE: /* * Remove a file from the input file list. */ if (ch_getflags() & CH_HELPFILE) break; old_ifile = curr_ifile; new_ifile = getoff_ifile(curr_ifile); if (new_ifile == NULL_IFILE) { bell(); break; } if (edit_ifile(new_ifile) != 0) { reedit_ifile(old_ifile); break; } del_ifile(old_ifile); break; case A_OPT_TOGGLE: /* * Change the setting of an option. */ optflag = OPT_TOGGLE; optgetname = FALSE; mca_opt_toggle(); c = getcc(); cbuf = opt_toggle_disallowed(c); if (cbuf != NULL) { error(cbuf, NULL_PARG); break; } goto again; case A_DISP_OPTION: /* * Report the setting of an option. */ optflag = OPT_NO_TOGGLE; optgetname = FALSE; mca_opt_toggle(); c = getcc(); goto again; case A_FIRSTCMD: /* * Set an initial command for new files. */ start_mca(A_FIRSTCMD, "+", (void*)NULL, 0); c = getcc(); goto again; case A_SHELL: /* * Shell escape. */ #if SHELL_ESCAPE if (!secure) { start_mca(A_SHELL, "!", ml_shell, 0); c = getcc(); goto again; } #endif error("Command not available", NULL_PARG); break; case A_SETMARK: case A_SETMARKBOT: /* * Set a mark. */ if (ch_getflags() & CH_HELPFILE) break; start_mca(A_SETMARK, "set mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c) || is_newline_char(c)) break; setmark(c, action == A_SETMARKBOT ? BOTTOM : TOP); repaint(); break; case A_CLRMARK: /* * Clear a mark. */ start_mca(A_CLRMARK, "clear mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c) || is_newline_char(c)) break; clrmark(c); repaint(); break; case A_GOMARK: /* * Jump to a marked position. */ start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c) || is_newline_char(c)) break; cmd_exec(); gomark(c); break; case A_PIPE: /* * Write part of the input to a pipe to a shell command. */ #if PIPEC if (!secure) { start_mca(A_PIPE, "|mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c)) break; if (is_newline_char(c)) c = '.'; if (badmark(c)) break; pipec = c; start_mca(A_PIPE, "!", ml_shell, 0); c = getcc(); goto again; } #endif error("Command not available", NULL_PARG); break; case A_B_BRACKET: case A_F_BRACKET: start_mca(action, "Brackets: ", (void*)NULL, 0); c = getcc(); goto again; case A_LSHIFT: /* * Shift view left. */ if (number > 0) shift_count = number; else number = (shift_count > 0) ? shift_count : sc_width / 2; if (number > hshift) number = hshift; hshift -= number; screen_trashed = 1; break; case A_RSHIFT: /* * Shift view right. */ if (number > 0) shift_count = number; else number = (shift_count > 0) ? shift_count : sc_width / 2; hshift += number; screen_trashed = 1; break; case A_LLSHIFT: /* * Shift view left to margin. */ hshift = 0; screen_trashed = 1; break; case A_RRSHIFT: /* * Shift view right to view rightmost char on screen. */ hshift = rrshift(); screen_trashed = 1; break; case A_PREFIX: /* * The command is incomplete (more chars are needed). * Display the current char, so the user knows * what's going on, and get another character. */ if (mca != A_PREFIX) { cmd_reset(); start_mca(A_PREFIX, " ", (void*)NULL, CF_QUIT_ON_ERASE); (void) cmd_char(c); } c = getcc(); goto again; case A_NOACTION: break; default: bell(); break; } } }