1008 lines
21 KiB
C
1008 lines
21 KiB
C
/*
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* Copyright (C) 1984-2019 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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* Routines to decode user commands.
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*
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* This is all table driven.
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* A command table is a sequence of command descriptors.
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* Each command descriptor is a sequence of bytes with the following format:
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* <c1><c2>...<cN><0><action>
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* The characters c1,c2,...,cN are the command string; that is,
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* the characters which the user must type.
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* It is terminated by a null <0> byte.
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* The byte after the null byte is the action code associated
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* with the command string.
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* If an action byte is OR-ed with A_EXTRA, this indicates
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* that the option byte is followed by an extra string.
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*
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* There may be many command tables.
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* The first (default) table is built-in.
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* Other tables are read in from "lesskey" files.
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* All the tables are linked together and are searched in order.
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*/
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#include "less.h"
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#include "cmd.h"
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#include "lesskey.h"
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extern int erase_char, erase2_char, kill_char;
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extern int secure;
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extern int mousecap;
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extern int screen_trashed;
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extern int sc_height;
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#define SK(k) \
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SK_SPECIAL_KEY, (k), 6, 1, 1, 1
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/*
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* Command table is ordered roughly according to expected
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* frequency of use, so the common commands are near the beginning.
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*/
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static unsigned char cmdtable[] =
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{
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'\r',0, A_F_LINE,
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'\n',0, A_F_LINE,
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'e',0, A_F_LINE,
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'j',0, A_F_LINE,
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SK(SK_DOWN_ARROW),0, A_F_LINE,
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CONTROL('E'),0, A_F_LINE,
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CONTROL('N'),0, A_F_LINE,
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'k',0, A_B_LINE,
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'y',0, A_B_LINE,
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CONTROL('Y'),0, A_B_LINE,
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SK(SK_CONTROL_K),0, A_B_LINE,
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CONTROL('P'),0, A_B_LINE,
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SK(SK_UP_ARROW),0, A_B_LINE,
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'J',0, A_FF_LINE,
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'K',0, A_BF_LINE,
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'Y',0, A_BF_LINE,
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'd',0, A_F_SCROLL,
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CONTROL('D'),0, A_F_SCROLL,
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'u',0, A_B_SCROLL,
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CONTROL('U'),0, A_B_SCROLL,
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ESC,'[','M',0, A_X11MOUSE_IN,
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ESC,'[','<',0, A_X116MOUSE_IN,
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' ',0, A_F_SCREEN,
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'f',0, A_F_SCREEN,
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CONTROL('F'),0, A_F_SCREEN,
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CONTROL('V'),0, A_F_SCREEN,
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SK(SK_PAGE_DOWN),0, A_F_SCREEN,
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'b',0, A_B_SCREEN,
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CONTROL('B'),0, A_B_SCREEN,
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ESC,'v',0, A_B_SCREEN,
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SK(SK_PAGE_UP),0, A_B_SCREEN,
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'z',0, A_F_WINDOW,
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'w',0, A_B_WINDOW,
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ESC,' ',0, A_FF_SCREEN,
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'F',0, A_F_FOREVER,
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ESC,'F',0, A_F_UNTIL_HILITE,
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'R',0, A_FREPAINT,
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'r',0, A_REPAINT,
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CONTROL('R'),0, A_REPAINT,
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CONTROL('L'),0, A_REPAINT,
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ESC,'u',0, A_UNDO_SEARCH,
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'g',0, A_GOLINE,
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SK(SK_HOME),0, A_GOLINE,
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'<',0, A_GOLINE,
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ESC,'<',0, A_GOLINE,
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'p',0, A_PERCENT,
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'%',0, A_PERCENT,
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ESC,'[',0, A_LSHIFT,
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ESC,']',0, A_RSHIFT,
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ESC,'(',0, A_LSHIFT,
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ESC,')',0, A_RSHIFT,
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ESC,'{',0, A_LLSHIFT,
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ESC,'}',0, A_RRSHIFT,
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SK(SK_RIGHT_ARROW),0, A_RSHIFT,
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SK(SK_LEFT_ARROW),0, A_LSHIFT,
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SK(SK_CTL_RIGHT_ARROW),0, A_RRSHIFT,
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SK(SK_CTL_LEFT_ARROW),0, A_LLSHIFT,
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'{',0, A_F_BRACKET|A_EXTRA, '{','}',0,
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'}',0, A_B_BRACKET|A_EXTRA, '{','}',0,
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'(',0, A_F_BRACKET|A_EXTRA, '(',')',0,
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')',0, A_B_BRACKET|A_EXTRA, '(',')',0,
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'[',0, A_F_BRACKET|A_EXTRA, '[',']',0,
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']',0, A_B_BRACKET|A_EXTRA, '[',']',0,
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ESC,CONTROL('F'),0, A_F_BRACKET,
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ESC,CONTROL('B'),0, A_B_BRACKET,
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'G',0, A_GOEND,
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ESC,'G',0, A_GOEND_BUF,
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ESC,'>',0, A_GOEND,
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'>',0, A_GOEND,
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SK(SK_END),0, A_GOEND,
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'P',0, A_GOPOS,
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'0',0, A_DIGIT,
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'1',0, A_DIGIT,
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'2',0, A_DIGIT,
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'3',0, A_DIGIT,
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'4',0, A_DIGIT,
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'5',0, A_DIGIT,
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'6',0, A_DIGIT,
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'7',0, A_DIGIT,
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'8',0, A_DIGIT,
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'9',0, A_DIGIT,
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'.',0, A_DIGIT,
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'=',0, A_STAT,
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CONTROL('G'),0, A_STAT,
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':','f',0, A_STAT,
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'/',0, A_F_SEARCH,
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'?',0, A_B_SEARCH,
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ESC,'/',0, A_F_SEARCH|A_EXTRA, '*',0,
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ESC,'?',0, A_B_SEARCH|A_EXTRA, '*',0,
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'n',0, A_AGAIN_SEARCH,
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ESC,'n',0, A_T_AGAIN_SEARCH,
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'N',0, A_REVERSE_SEARCH,
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ESC,'N',0, A_T_REVERSE_SEARCH,
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'&',0, A_FILTER,
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'm',0, A_SETMARK,
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'M',0, A_SETMARKBOT,
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ESC,'m',0, A_CLRMARK,
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'\'',0, A_GOMARK,
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CONTROL('X'),CONTROL('X'),0, A_GOMARK,
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'E',0, A_EXAMINE,
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':','e',0, A_EXAMINE,
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CONTROL('X'),CONTROL('V'),0, A_EXAMINE,
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':','n',0, A_NEXT_FILE,
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':','p',0, A_PREV_FILE,
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't',0, A_NEXT_TAG,
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'T',0, A_PREV_TAG,
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':','x',0, A_INDEX_FILE,
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':','d',0, A_REMOVE_FILE,
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'-',0, A_OPT_TOGGLE,
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':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0,
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's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0,
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'_',0, A_DISP_OPTION,
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'|',0, A_PIPE,
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'v',0, A_VISUAL,
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'!',0, A_SHELL,
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'+',0, A_FIRSTCMD,
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'H',0, A_HELP,
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'h',0, A_HELP,
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SK(SK_F1),0, A_HELP,
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'V',0, A_VERSION,
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'q',0, A_QUIT,
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'Q',0, A_QUIT,
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':','q',0, A_QUIT,
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':','Q',0, A_QUIT,
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'Z','Z',0, A_QUIT
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};
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static unsigned char edittable[] =
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{
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'\t',0, EC_F_COMPLETE, /* TAB */
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'\17',0, EC_B_COMPLETE, /* BACKTAB */
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SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */
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ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */
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CONTROL('L'),0, EC_EXPAND, /* CTRL-L */
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CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */
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CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */
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ESC,'l',0, EC_RIGHT, /* ESC l */
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SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */
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ESC,'h',0, EC_LEFT, /* ESC h */
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SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */
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ESC,'b',0, EC_W_LEFT, /* ESC b */
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ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */
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SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */
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ESC,'w',0, EC_W_RIGHT, /* ESC w */
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ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */
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SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
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ESC,'i',0, EC_INSERT, /* ESC i */
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SK(SK_INSERT),0, EC_INSERT, /* INSERT */
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ESC,'x',0, EC_DELETE, /* ESC x */
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SK(SK_DELETE),0, EC_DELETE, /* DELETE */
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ESC,'X',0, EC_W_DELETE, /* ESC X */
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ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */
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SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */
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SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
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ESC,'\b',0, EC_W_BACKSPACE, /* ESC BACKSPACE */
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ESC,'0',0, EC_HOME, /* ESC 0 */
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SK(SK_HOME),0, EC_HOME, /* HOME */
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ESC,'$',0, EC_END, /* ESC $ */
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SK(SK_END),0, EC_END, /* END */
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ESC,'k',0, EC_UP, /* ESC k */
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SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */
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ESC,'j',0, EC_DOWN, /* ESC j */
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SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */
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CONTROL('G'),0, EC_ABORT, /* CTRL-G */
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};
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/*
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* Structure to support a list of command tables.
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*/
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struct tablelist
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{
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struct tablelist *t_next;
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char *t_start;
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char *t_end;
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};
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/*
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* List of command tables and list of line-edit tables.
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*/
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static struct tablelist *list_fcmd_tables = NULL;
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static struct tablelist *list_ecmd_tables = NULL;
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static struct tablelist *list_var_tables = NULL;
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static struct tablelist *list_sysvar_tables = NULL;
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/*
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* Expand special key abbreviations in a command table.
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*/
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static void
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expand_special_keys(table, len)
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char *table;
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int len;
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{
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char *fm;
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char *to;
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int a;
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char *repl;
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int klen;
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for (fm = table; fm < table + len; )
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{
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/*
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* Rewrite each command in the table with any
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* special key abbreviations expanded.
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*/
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for (to = fm; *fm != '\0'; )
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{
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if (*fm != SK_SPECIAL_KEY)
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{
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*to++ = *fm++;
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continue;
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}
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/*
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* After SK_SPECIAL_KEY, next byte is the type
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* of special key (one of the SK_* contants),
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* and the byte after that is the number of bytes,
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* N, reserved by the abbreviation (including the
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* SK_SPECIAL_KEY and key type bytes).
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* Replace all N bytes with the actual bytes
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* output by the special key on this terminal.
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*/
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repl = special_key_str(fm[1]);
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klen = fm[2] & 0377;
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fm += klen;
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if (repl == NULL || (int) strlen(repl) > klen)
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repl = "\377";
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while (*repl != '\0')
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*to++ = *repl++;
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}
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*to++ = '\0';
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/*
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* Fill any unused bytes between end of command and
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* the action byte with A_SKIP.
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*/
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while (to <= fm)
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*to++ = A_SKIP;
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fm++;
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a = *fm++ & 0377;
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if (a & A_EXTRA)
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{
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while (*fm++ != '\0')
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continue;
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}
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}
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}
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/*
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* Expand special key abbreviations in a list of command tables.
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*/
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static void
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expand_cmd_table(tlist)
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struct tablelist *tlist;
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{
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struct tablelist *t;
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for (t = tlist; t != NULL; t = t->t_next)
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{
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expand_special_keys(t->t_start, t->t_end - t->t_start);
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}
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}
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/*
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* Expand special key abbreviations in all command tables.
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*/
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public void
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expand_cmd_tables(VOID_PARAM)
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{
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expand_cmd_table(list_fcmd_tables);
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expand_cmd_table(list_ecmd_tables);
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expand_cmd_table(list_var_tables);
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expand_cmd_table(list_sysvar_tables);
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}
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/*
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* Initialize the command lists.
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*/
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public void
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init_cmds(VOID_PARAM)
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{
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/*
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* Add the default command tables.
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*/
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add_fcmd_table((char*)cmdtable, sizeof(cmdtable));
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add_ecmd_table((char*)edittable, sizeof(edittable));
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#if USERFILE
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/*
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* For backwards compatibility,
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* try to add tables in the OLD system lesskey file.
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*/
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#ifdef BINDIR
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add_hometable(NULL, BINDIR "/.sysless", 1);
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#endif
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/*
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* Try to add the tables in the system lesskey file.
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*/
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add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1);
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/*
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* Try to add the tables in the standard lesskey file "$HOME/.less".
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*/
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add_hometable("LESSKEY", LESSKEYFILE, 0);
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#endif
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}
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/*
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* Add a command table.
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*/
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static int
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add_cmd_table(tlist, buf, len)
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struct tablelist **tlist;
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char *buf;
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int len;
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{
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struct tablelist *t;
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if (len == 0)
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return (0);
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/*
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* Allocate a tablelist structure, initialize it,
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* and link it into the list of tables.
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*/
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if ((t = (struct tablelist *)
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calloc(1, sizeof(struct tablelist))) == NULL)
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{
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return (-1);
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}
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t->t_start = buf;
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t->t_end = buf + len;
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t->t_next = *tlist;
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*tlist = t;
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return (0);
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}
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/*
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* Add a command table.
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*/
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public void
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add_fcmd_table(buf, len)
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char *buf;
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int len;
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{
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if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
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error("Warning: some commands disabled", NULL_PARG);
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}
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/*
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* Add an editing command table.
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*/
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public void
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add_ecmd_table(buf, len)
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char *buf;
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int len;
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{
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if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
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error("Warning: some edit commands disabled", NULL_PARG);
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}
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/*
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* Add an environment variable table.
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*/
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static void
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add_var_table(tlist, buf, len)
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struct tablelist **tlist;
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char *buf;
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int len;
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{
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if (add_cmd_table(tlist, buf, len) < 0)
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error("Warning: environment variables from lesskey file unavailable", NULL_PARG);
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}
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/*
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* Return action for a mouse wheel down event.
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*/
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static int
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mouse_wheel_down(VOID_PARAM)
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{
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return ((mousecap == OPT_ONPLUS) ? A_B_MOUSE : A_F_MOUSE);
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}
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/*
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* Return action for a mouse wheel up event.
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*/
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static int
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mouse_wheel_up(VOID_PARAM)
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{
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return ((mousecap == OPT_ONPLUS) ? A_F_MOUSE : A_B_MOUSE);
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}
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/*
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* Return action for a mouse button release event.
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*/
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static int
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mouse_button_rel(x, y)
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int x;
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int y;
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{
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/*
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* {{ It would be better to return an action and then do this
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* in commands() but it's nontrivial to pass y to it. }}
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*/
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if (y < sc_height-1)
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{
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setmark('#', y);
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screen_trashed = 1;
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}
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return (A_NOACTION);
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}
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/*
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* Read a decimal integer. Return the integer and set *pterm to the terminating char.
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*/
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static int
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getcc_int(pterm)
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char* pterm;
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{
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int num = 0;
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int digits = 0;
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for (;;)
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{
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char ch = getcc();
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if (ch < '0' || ch > '9')
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{
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if (pterm != NULL) *pterm = ch;
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if (digits == 0)
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return (-1);
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return (num);
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}
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num = (10 * num) + (ch - '0');
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++digits;
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}
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}
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/*
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* Read suffix of mouse input and return the action to take.
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* The prefix ("\e[M") has already been read.
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*/
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static int
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x11mouse_action(VOID_PARAM)
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{
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int b = getcc() - X11MOUSE_OFFSET;
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int x = getcc() - X11MOUSE_OFFSET-1;
|
|
int y = getcc() - X11MOUSE_OFFSET-1;
|
|
switch (b) {
|
|
default:
|
|
return (A_NOACTION);
|
|
case X11MOUSE_WHEEL_DOWN:
|
|
return mouse_wheel_down();
|
|
case X11MOUSE_WHEEL_UP:
|
|
return mouse_wheel_up();
|
|
case X11MOUSE_BUTTON_REL:
|
|
return mouse_button_rel(x, y);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Read suffix of mouse input and return the action to take.
|
|
* The prefix ("\e[<") has already been read.
|
|
*/
|
|
static int
|
|
x116mouse_action(VOID_PARAM)
|
|
{
|
|
char ch;
|
|
int x, y;
|
|
int b = getcc_int(&ch);
|
|
if (b < 0 || ch != ';') return (A_NOACTION);
|
|
x = getcc_int(&ch) - 1;
|
|
if (x < 0 || ch != ';') return (A_NOACTION);
|
|
y = getcc_int(&ch) - 1;
|
|
if (y < 0) return (A_NOACTION);
|
|
switch (b) {
|
|
case X11MOUSE_WHEEL_DOWN:
|
|
return mouse_wheel_down();
|
|
case X11MOUSE_WHEEL_UP:
|
|
return mouse_wheel_up();
|
|
default:
|
|
if (ch != 'm') return (A_NOACTION);
|
|
return mouse_button_rel(x, y);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Search a single command table for the command string in cmd.
|
|
*/
|
|
static int
|
|
cmd_search(cmd, table, endtable, sp)
|
|
char *cmd;
|
|
char *table;
|
|
char *endtable;
|
|
char **sp;
|
|
{
|
|
char *p;
|
|
char *q;
|
|
int a;
|
|
|
|
*sp = NULL;
|
|
for (p = table, q = cmd; p < endtable; p++, q++)
|
|
{
|
|
if (*p == *q)
|
|
{
|
|
/*
|
|
* Current characters match.
|
|
* If we're at the end of the string, we've found it.
|
|
* Return the action code, which is the character
|
|
* after the null at the end of the string
|
|
* in the command table.
|
|
*/
|
|
if (*p == '\0')
|
|
{
|
|
a = *++p & 0377;
|
|
while (a == A_SKIP)
|
|
a = *++p & 0377;
|
|
if (a == A_END_LIST)
|
|
{
|
|
/*
|
|
* We get here only if the original
|
|
* cmd string passed in was empty ("").
|
|
* I don't think that can happen,
|
|
* but just in case ...
|
|
*/
|
|
return (A_UINVALID);
|
|
}
|
|
/*
|
|
* Check for an "extra" string.
|
|
*/
|
|
if (a & A_EXTRA)
|
|
{
|
|
*sp = ++p;
|
|
a &= ~A_EXTRA;
|
|
}
|
|
if (a == A_X11MOUSE_IN)
|
|
a = x11mouse_action();
|
|
else if (a == A_X116MOUSE_IN)
|
|
a = x116mouse_action();
|
|
return (a);
|
|
}
|
|
} else if (*q == '\0')
|
|
{
|
|
/*
|
|
* Hit the end of the user's command,
|
|
* but not the end of the string in the command table.
|
|
* The user's command is incomplete.
|
|
*/
|
|
return (A_PREFIX);
|
|
} else
|
|
{
|
|
/*
|
|
* Not a match.
|
|
* Skip ahead to the next command in the
|
|
* command table, and reset the pointer
|
|
* to the beginning of the user's command.
|
|
*/
|
|
if (*p == '\0' && p[1] == A_END_LIST)
|
|
{
|
|
/*
|
|
* A_END_LIST is a special marker that tells
|
|
* us to abort the cmd search.
|
|
*/
|
|
return (A_UINVALID);
|
|
}
|
|
while (*p++ != '\0')
|
|
continue;
|
|
while (*p == A_SKIP)
|
|
p++;
|
|
if (*p & A_EXTRA)
|
|
while (*++p != '\0')
|
|
continue;
|
|
q = cmd-1;
|
|
}
|
|
}
|
|
/*
|
|
* No match found in the entire command table.
|
|
*/
|
|
return (A_INVALID);
|
|
}
|
|
|
|
/*
|
|
* Decode a command character and return the associated action.
|
|
* The "extra" string, if any, is returned in sp.
|
|
*/
|
|
static int
|
|
cmd_decode(tlist, cmd, sp)
|
|
struct tablelist *tlist;
|
|
char *cmd;
|
|
char **sp;
|
|
{
|
|
struct tablelist *t;
|
|
int action = A_INVALID;
|
|
|
|
/*
|
|
* Search thru all the command tables.
|
|
* Stop when we find an action which is not A_INVALID.
|
|
*/
|
|
for (t = tlist; t != NULL; t = t->t_next)
|
|
{
|
|
action = cmd_search(cmd, t->t_start, t->t_end, sp);
|
|
if (action != A_INVALID)
|
|
break;
|
|
}
|
|
if (action == A_UINVALID)
|
|
action = A_INVALID;
|
|
return (action);
|
|
}
|
|
|
|
/*
|
|
* Decode a command from the cmdtables list.
|
|
*/
|
|
public int
|
|
fcmd_decode(cmd, sp)
|
|
char *cmd;
|
|
char **sp;
|
|
{
|
|
return (cmd_decode(list_fcmd_tables, cmd, sp));
|
|
}
|
|
|
|
/*
|
|
* Decode a command from the edittables list.
|
|
*/
|
|
public int
|
|
ecmd_decode(cmd, sp)
|
|
char *cmd;
|
|
char **sp;
|
|
{
|
|
return (cmd_decode(list_ecmd_tables, cmd, sp));
|
|
}
|
|
|
|
/*
|
|
* Get the value of an environment variable.
|
|
* Looks first in the lesskey file, then in the real environment.
|
|
*/
|
|
public char *
|
|
lgetenv(var)
|
|
char *var;
|
|
{
|
|
int a;
|
|
char *s;
|
|
|
|
a = cmd_decode(list_var_tables, var, &s);
|
|
if (a == EV_OK)
|
|
return (s);
|
|
s = getenv(var);
|
|
if (s != NULL && *s != '\0')
|
|
return (s);
|
|
a = cmd_decode(list_sysvar_tables, var, &s);
|
|
if (a == EV_OK)
|
|
return (s);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Is a string null or empty?
|
|
*/
|
|
public int
|
|
isnullenv(s)
|
|
char* s;
|
|
{
|
|
return (s == NULL || *s == '\0');
|
|
}
|
|
|
|
#if USERFILE
|
|
/*
|
|
* Get an "integer" from a lesskey file.
|
|
* Integers are stored in a funny format:
|
|
* two bytes, low order first, in radix KRADIX.
|
|
*/
|
|
static int
|
|
gint(sp)
|
|
char **sp;
|
|
{
|
|
int n;
|
|
|
|
n = *(*sp)++;
|
|
n += *(*sp)++ * KRADIX;
|
|
return (n);
|
|
}
|
|
|
|
/*
|
|
* Process an old (pre-v241) lesskey file.
|
|
*/
|
|
static int
|
|
old_lesskey(buf, len)
|
|
char *buf;
|
|
int len;
|
|
{
|
|
/*
|
|
* Old-style lesskey file.
|
|
* The file must end with either
|
|
* ...,cmd,0,action
|
|
* or ...,cmd,0,action|A_EXTRA,string,0
|
|
* So the last byte or the second to last byte must be zero.
|
|
*/
|
|
if (buf[len-1] != '\0' && buf[len-2] != '\0')
|
|
return (-1);
|
|
add_fcmd_table(buf, len);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Process a new (post-v241) lesskey file.
|
|
*/
|
|
static int
|
|
new_lesskey(buf, len, sysvar)
|
|
char *buf;
|
|
int len;
|
|
int sysvar;
|
|
{
|
|
char *p;
|
|
int c;
|
|
int n;
|
|
|
|
/*
|
|
* New-style lesskey file.
|
|
* Extract the pieces.
|
|
*/
|
|
if (buf[len-3] != C0_END_LESSKEY_MAGIC ||
|
|
buf[len-2] != C1_END_LESSKEY_MAGIC ||
|
|
buf[len-1] != C2_END_LESSKEY_MAGIC)
|
|
return (-1);
|
|
p = buf + 4;
|
|
for (;;)
|
|
{
|
|
c = *p++;
|
|
switch (c)
|
|
{
|
|
case CMD_SECTION:
|
|
n = gint(&p);
|
|
add_fcmd_table(p, n);
|
|
p += n;
|
|
break;
|
|
case EDIT_SECTION:
|
|
n = gint(&p);
|
|
add_ecmd_table(p, n);
|
|
p += n;
|
|
break;
|
|
case VAR_SECTION:
|
|
n = gint(&p);
|
|
add_var_table((sysvar) ?
|
|
&list_sysvar_tables : &list_var_tables, p, n);
|
|
p += n;
|
|
break;
|
|
case END_SECTION:
|
|
return (0);
|
|
default:
|
|
/*
|
|
* Unrecognized section type.
|
|
*/
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set up a user command table, based on a "lesskey" file.
|
|
*/
|
|
public int
|
|
lesskey(filename, sysvar)
|
|
char *filename;
|
|
int sysvar;
|
|
{
|
|
char *buf;
|
|
POSITION len;
|
|
long n;
|
|
int f;
|
|
|
|
if (secure)
|
|
return (1);
|
|
/*
|
|
* Try to open the lesskey file.
|
|
*/
|
|
f = open(filename, OPEN_READ);
|
|
if (f < 0)
|
|
return (1);
|
|
|
|
/*
|
|
* Read the file into a buffer.
|
|
* We first figure out the size of the file and allocate space for it.
|
|
* {{ Minimal error checking is done here.
|
|
* A garbage .less file will produce strange results.
|
|
* To avoid a large amount of error checking code here, we
|
|
* rely on the lesskey program to generate a good .less file. }}
|
|
*/
|
|
len = filesize(f);
|
|
if (len == NULL_POSITION || len < 3)
|
|
{
|
|
/*
|
|
* Bad file (valid file must have at least 3 chars).
|
|
*/
|
|
close(f);
|
|
return (-1);
|
|
}
|
|
if ((buf = (char *) calloc((int)len, sizeof(char))) == NULL)
|
|
{
|
|
close(f);
|
|
return (-1);
|
|
}
|
|
if (lseek(f, (off_t)0, SEEK_SET) == BAD_LSEEK)
|
|
{
|
|
free(buf);
|
|
close(f);
|
|
return (-1);
|
|
}
|
|
n = read(f, buf, (unsigned int) len);
|
|
close(f);
|
|
if (n != len)
|
|
{
|
|
free(buf);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Figure out if this is an old-style (before version 241)
|
|
* or new-style lesskey file format.
|
|
*/
|
|
if (buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
|
|
buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
|
|
return (old_lesskey(buf, (int)len));
|
|
return (new_lesskey(buf, (int)len, sysvar));
|
|
}
|
|
|
|
/*
|
|
* Add the standard lesskey file "$HOME/.less"
|
|
*/
|
|
public void
|
|
add_hometable(envname, def_filename, sysvar)
|
|
char *envname;
|
|
char *def_filename;
|
|
int sysvar;
|
|
{
|
|
char *filename;
|
|
PARG parg;
|
|
|
|
if (envname != NULL && (filename = lgetenv(envname)) != NULL)
|
|
filename = save(filename);
|
|
else if (sysvar)
|
|
filename = save(def_filename);
|
|
else
|
|
filename = homefile(def_filename);
|
|
if (filename == NULL)
|
|
return;
|
|
if (lesskey(filename, sysvar) < 0)
|
|
{
|
|
parg.p_string = filename;
|
|
error("Cannot use lesskey file \"%s\"", &parg);
|
|
}
|
|
free(filename);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* See if a char is a special line-editing command.
|
|
*/
|
|
public int
|
|
editchar(c, flags)
|
|
int c;
|
|
int flags;
|
|
{
|
|
int action;
|
|
int nch;
|
|
char *s;
|
|
char usercmd[MAX_CMDLEN+1];
|
|
|
|
/*
|
|
* An editing character could actually be a sequence of characters;
|
|
* for example, an escape sequence sent by pressing the uparrow key.
|
|
* To match the editing string, we use the command decoder
|
|
* but give it the edit-commands command table
|
|
* This table is constructed to match the user's keyboard.
|
|
*/
|
|
if (c == erase_char || c == erase2_char)
|
|
return (EC_BACKSPACE);
|
|
if (c == kill_char)
|
|
{
|
|
#if MSDOS_COMPILER==WIN32C
|
|
if (!win32_kbhit())
|
|
#endif
|
|
|
|
return (EC_LINEKILL);
|
|
}
|
|
|
|
/*
|
|
* Collect characters in a buffer.
|
|
* Start with the one we have, and get more if we need them.
|
|
*/
|
|
nch = 0;
|
|
do {
|
|
if (nch > 0)
|
|
c = getcc();
|
|
usercmd[nch] = c;
|
|
usercmd[nch+1] = '\0';
|
|
nch++;
|
|
action = ecmd_decode(usercmd, &s);
|
|
} while (action == A_PREFIX);
|
|
|
|
if (flags & EC_NORIGHTLEFT)
|
|
{
|
|
switch (action)
|
|
{
|
|
case EC_RIGHT:
|
|
case EC_LEFT:
|
|
action = A_INVALID;
|
|
break;
|
|
}
|
|
}
|
|
#if CMD_HISTORY
|
|
if (flags & EC_NOHISTORY)
|
|
{
|
|
/*
|
|
* The caller says there is no history list.
|
|
* Reject any history-manipulation action.
|
|
*/
|
|
switch (action)
|
|
{
|
|
case EC_UP:
|
|
case EC_DOWN:
|
|
action = A_INVALID;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
#if TAB_COMPLETE_FILENAME
|
|
if (flags & EC_NOCOMPLETE)
|
|
{
|
|
/*
|
|
* The caller says we don't want any filename completion cmds.
|
|
* Reject them.
|
|
*/
|
|
switch (action)
|
|
{
|
|
case EC_F_COMPLETE:
|
|
case EC_B_COMPLETE:
|
|
case EC_EXPAND:
|
|
action = A_INVALID;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
if ((flags & EC_PEEK) || action == A_INVALID)
|
|
{
|
|
/*
|
|
* We're just peeking, or we didn't understand the command.
|
|
* Unget all the characters we read in the loop above.
|
|
* This does NOT include the original character that was
|
|
* passed in as a parameter.
|
|
*/
|
|
while (nch > 1)
|
|
{
|
|
ungetcc(usercmd[--nch]);
|
|
}
|
|
} else
|
|
{
|
|
if (s != NULL)
|
|
ungetsc(s);
|
|
}
|
|
return action;
|
|
}
|
|
|