875 lines
18 KiB
C
875 lines
18 KiB
C
/*
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* Copyright (C) 1984-2015 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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* lesskey [-o output] [input]
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Make a .less file.
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* If no input file is specified, standard input is used.
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* If no output file is specified, $HOME/.less is used.
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*
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* The .less file is used to specify (to "less") user-defined
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* key bindings. Basically any sequence of 1 to MAX_CMDLEN
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* keystrokes may be bound to an existing less function.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* The input file is an ascii file consisting of a
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* sequence of lines of the form:
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* string <whitespace> action [chars] <newline>
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*
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* "string" is a sequence of command characters which form
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* the new user-defined command. The command
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* characters may be:
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* 1. The actual character itself.
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* 2. A character preceded by ^ to specify a
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* control character (e.g. ^X means control-X).
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* 3. A backslash followed by one to three octal digits
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* to specify a character by its octal value.
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* 4. A backslash followed by b, e, n, r or t
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* to specify \b, ESC, \n, \r or \t, respectively.
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* 5. Any character (other than those mentioned above) preceded
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* by a \ to specify the character itself (characters which
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* must be preceded by \ include ^, \, and whitespace.
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* "action" is the name of a "less" action, from the table below.
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* "chars" is an optional sequence of characters which is treated
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* as keyboard input after the command is executed.
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*
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* Blank lines and lines which start with # are ignored,
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* except for the special control lines:
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* #command Signals the beginning of the command
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* keys section.
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* #line-edit Signals the beginning of the line-editing
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* keys section.
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* #env Signals the beginning of the environment
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* variable section.
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* #stop Stops command parsing in less;
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* causes all default keys to be disabled.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* The output file is a non-ascii file, consisting of a header,
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* one or more sections, and a trailer.
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* Each section begins with a section header, a section length word
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* and the section data. Normally there are three sections:
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* CMD_SECTION Definition of command keys.
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* EDIT_SECTION Definition of editing keys.
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* END_SECTION A special section header, with no
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* length word or section data.
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*
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* Section data consists of zero or more byte sequences of the form:
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* string <0> <action>
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* or
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* string <0> <action|A_EXTRA> chars <0>
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*
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* "string" is the command string.
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* "<0>" is one null byte.
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* "<action>" is one byte containing the action code (the A_xxx value).
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* If action is ORed with A_EXTRA, the action byte is followed
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* by the null-terminated "chars" string.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*/
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#include "less.h"
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#include "lesskey.h"
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#include "cmd.h"
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struct cmdname
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{
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char *cn_name;
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int cn_action;
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};
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struct cmdname cmdnames[] =
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{
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{ "back-bracket", A_B_BRACKET },
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{ "back-line", A_B_LINE },
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{ "back-line-force", A_BF_LINE },
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{ "back-screen", A_B_SCREEN },
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{ "back-scroll", A_B_SCROLL },
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{ "back-search", A_B_SEARCH },
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{ "back-window", A_B_WINDOW },
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{ "debug", A_DEBUG },
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{ "digit", A_DIGIT },
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{ "display-flag", A_DISP_OPTION },
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{ "display-option", A_DISP_OPTION },
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{ "end", A_GOEND },
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{ "examine", A_EXAMINE },
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{ "filter", A_FILTER },
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{ "first-cmd", A_FIRSTCMD },
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{ "firstcmd", A_FIRSTCMD },
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{ "flush-repaint", A_FREPAINT },
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{ "forw-bracket", A_F_BRACKET },
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{ "forw-forever", A_F_FOREVER },
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{ "forw-until-hilite", A_F_UNTIL_HILITE },
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{ "forw-line", A_F_LINE },
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{ "forw-line-force", A_FF_LINE },
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{ "forw-screen", A_F_SCREEN },
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{ "forw-screen-force", A_FF_SCREEN },
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{ "forw-scroll", A_F_SCROLL },
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{ "forw-search", A_F_SEARCH },
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{ "forw-window", A_F_WINDOW },
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{ "goto-end", A_GOEND },
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{ "goto-end-buffered", A_GOEND_BUF },
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{ "goto-line", A_GOLINE },
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{ "goto-mark", A_GOMARK },
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{ "help", A_HELP },
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{ "index-file", A_INDEX_FILE },
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{ "invalid", A_UINVALID },
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{ "left-scroll", A_LSHIFT },
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{ "next-file", A_NEXT_FILE },
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{ "next-tag", A_NEXT_TAG },
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{ "noaction", A_NOACTION },
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{ "percent", A_PERCENT },
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{ "pipe", A_PIPE },
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{ "prev-file", A_PREV_FILE },
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{ "prev-tag", A_PREV_TAG },
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{ "quit", A_QUIT },
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{ "remove-file", A_REMOVE_FILE },
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{ "repaint", A_REPAINT },
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{ "repaint-flush", A_FREPAINT },
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{ "repeat-search", A_AGAIN_SEARCH },
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{ "repeat-search-all", A_T_AGAIN_SEARCH },
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{ "reverse-search", A_REVERSE_SEARCH },
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{ "reverse-search-all", A_T_REVERSE_SEARCH },
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{ "right-scroll", A_RSHIFT },
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{ "set-mark", A_SETMARK },
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{ "shell", A_SHELL },
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{ "status", A_STAT },
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{ "toggle-flag", A_OPT_TOGGLE },
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{ "toggle-option", A_OPT_TOGGLE },
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{ "undo-hilite", A_UNDO_SEARCH },
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{ "version", A_VERSION },
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{ "visual", A_VISUAL },
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{ NULL, 0 }
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};
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struct cmdname editnames[] =
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{
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{ "back-complete", EC_B_COMPLETE },
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{ "backspace", EC_BACKSPACE },
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{ "delete", EC_DELETE },
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{ "down", EC_DOWN },
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{ "end", EC_END },
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{ "expand", EC_EXPAND },
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{ "forw-complete", EC_F_COMPLETE },
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{ "home", EC_HOME },
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{ "insert", EC_INSERT },
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{ "invalid", EC_UINVALID },
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{ "kill-line", EC_LINEKILL },
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{ "abort", EC_ABORT },
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{ "left", EC_LEFT },
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{ "literal", EC_LITERAL },
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{ "right", EC_RIGHT },
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{ "up", EC_UP },
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{ "word-backspace", EC_W_BACKSPACE },
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{ "word-delete", EC_W_DELETE },
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{ "word-left", EC_W_LEFT },
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{ "word-right", EC_W_RIGHT },
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{ NULL, 0 }
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};
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struct table
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{
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struct cmdname *names;
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char *pbuffer;
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char buffer[MAX_USERCMD];
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};
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struct table cmdtable;
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struct table edittable;
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struct table vartable;
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struct table *currtable = &cmdtable;
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char fileheader[] = {
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C0_LESSKEY_MAGIC,
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C1_LESSKEY_MAGIC,
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C2_LESSKEY_MAGIC,
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C3_LESSKEY_MAGIC
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};
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char filetrailer[] = {
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C0_END_LESSKEY_MAGIC,
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C1_END_LESSKEY_MAGIC,
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C2_END_LESSKEY_MAGIC
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};
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char cmdsection[1] = { CMD_SECTION };
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char editsection[1] = { EDIT_SECTION };
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char varsection[1] = { VAR_SECTION };
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char endsection[1] = { END_SECTION };
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char *infile = NULL;
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char *outfile = NULL ;
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int linenum;
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int errors;
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extern char version[];
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void
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usage()
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{
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fprintf(stderr, "usage: lesskey [-o output] [input]\n");
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exit(1);
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}
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char *
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mkpathname(dirname, filename)
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char *dirname;
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char *filename;
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{
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char *pathname;
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pathname = calloc(strlen(dirname) + strlen(filename) + 2, sizeof(char));
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strcpy(pathname, dirname);
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strcat(pathname, PATHNAME_SEP);
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strcat(pathname, filename);
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return (pathname);
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}
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/*
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* Figure out the name of a default file (in the user's HOME directory).
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*/
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char *
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homefile(filename)
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char *filename;
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{
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char *p;
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char *pathname;
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if ((p = getenv("HOME")) != NULL && *p != '\0')
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pathname = mkpathname(p, filename);
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#if OS2
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else if ((p = getenv("INIT")) != NULL && *p != '\0')
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pathname = mkpathname(p, filename);
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#endif
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else
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{
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fprintf(stderr, "cannot find $HOME - using current directory\n");
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pathname = mkpathname(".", filename);
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}
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return (pathname);
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}
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/*
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* Parse command line arguments.
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*/
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void
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parse_args(argc, argv)
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int argc;
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char **argv;
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{
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char *arg;
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outfile = NULL;
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while (--argc > 0)
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{
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arg = *++argv;
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if (arg[0] != '-')
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/* Arg does not start with "-"; it's not an option. */
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break;
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if (arg[1] == '\0')
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/* "-" means standard input. */
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break;
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if (arg[1] == '-' && arg[2] == '\0')
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{
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/* "--" means end of options. */
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argc--;
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argv++;
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break;
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}
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switch (arg[1])
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{
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case '-':
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if (strncmp(arg, "--output", 8) == 0)
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{
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if (arg[8] == '\0')
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outfile = &arg[8];
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else if (arg[8] == '=')
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outfile = &arg[9];
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else
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usage();
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goto opt_o;
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}
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if (strcmp(arg, "--version") == 0)
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{
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goto opt_V;
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}
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usage();
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break;
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case 'o':
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outfile = &argv[0][2];
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opt_o:
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if (*outfile == '\0')
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{
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if (--argc <= 0)
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usage();
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outfile = *(++argv);
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}
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break;
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case 'V':
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opt_V:
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printf("lesskey version %s\n", version);
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exit(0);
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default:
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usage();
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}
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}
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if (argc > 1)
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usage();
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/*
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* Open the input file, or use DEF_LESSKEYINFILE if none specified.
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*/
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if (argc > 0)
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infile = *argv;
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else
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infile = homefile(DEF_LESSKEYINFILE);
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}
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/*
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* Initialize data structures.
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*/
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void
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init_tables()
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{
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cmdtable.names = cmdnames;
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cmdtable.pbuffer = cmdtable.buffer;
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edittable.names = editnames;
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edittable.pbuffer = edittable.buffer;
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vartable.names = NULL;
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vartable.pbuffer = vartable.buffer;
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}
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/*
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* Parse one character of a string.
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*/
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char *
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tstr(pp, xlate)
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char **pp;
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int xlate;
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{
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register char *p;
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register char ch;
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register int i;
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static char buf[10];
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static char tstr_control_k[] =
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{ SK_SPECIAL_KEY, SK_CONTROL_K, 6, 1, 1, 1, '\0' };
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p = *pp;
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switch (*p)
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{
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case '\\':
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++p;
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switch (*p)
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{
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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/*
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* Parse an octal number.
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*/
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ch = 0;
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i = 0;
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do
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ch = 8*ch + (*p - '0');
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while (*++p >= '0' && *p <= '7' && ++i < 3);
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*pp = p;
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if (xlate && ch == CONTROL('K'))
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return tstr_control_k;
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buf[0] = ch;
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buf[1] = '\0';
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return (buf);
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case 'b':
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*pp = p+1;
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return ("\b");
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case 'e':
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*pp = p+1;
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buf[0] = ESC;
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buf[1] = '\0';
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return (buf);
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case 'n':
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*pp = p+1;
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return ("\n");
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case 'r':
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*pp = p+1;
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return ("\r");
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case 't':
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*pp = p+1;
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return ("\t");
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case 'k':
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if (xlate)
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{
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switch (*++p)
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{
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case 'u': ch = SK_UP_ARROW; break;
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case 'd': ch = SK_DOWN_ARROW; break;
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case 'r': ch = SK_RIGHT_ARROW; break;
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case 'l': ch = SK_LEFT_ARROW; break;
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case 'U': ch = SK_PAGE_UP; break;
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case 'D': ch = SK_PAGE_DOWN; break;
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case 'h': ch = SK_HOME; break;
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case 'e': ch = SK_END; break;
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case 'x': ch = SK_DELETE; break;
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default:
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error("illegal char after \\k");
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*pp = p+1;
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return ("");
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}
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*pp = p+1;
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buf[0] = SK_SPECIAL_KEY;
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buf[1] = ch;
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buf[2] = 6;
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buf[3] = 1;
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buf[4] = 1;
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buf[5] = 1;
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buf[6] = '\0';
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return (buf);
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}
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/* FALLTHRU */
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default:
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/*
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* Backslash followed by any other char
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* just means that char.
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*/
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*pp = p+1;
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buf[0] = *p;
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buf[1] = '\0';
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if (xlate && buf[0] == CONTROL('K'))
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return tstr_control_k;
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return (buf);
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}
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case '^':
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/*
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* Caret means CONTROL.
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*/
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*pp = p+2;
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buf[0] = CONTROL(p[1]);
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buf[1] = '\0';
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if (buf[0] == CONTROL('K'))
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return tstr_control_k;
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return (buf);
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}
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*pp = p+1;
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buf[0] = *p;
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buf[1] = '\0';
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if (xlate && buf[0] == CONTROL('K'))
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return tstr_control_k;
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return (buf);
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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 *
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skipsp(s)
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register 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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* Skip non-space characters in a string.
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*/
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public char *
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skipnsp(s)
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register char *s;
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{
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while (*s != '\0' && *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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* Clean up an input line:
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* strip off the trailing newline & any trailing # comment.
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*/
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char *
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clean_line(s)
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char *s;
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{
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register int i;
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s = skipsp(s);
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for (i = 0; s[i] != '\n' && s[i] != '\r' && s[i] != '\0'; i++)
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if (s[i] == '#' && (i == 0 || s[i-1] != '\\'))
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break;
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s[i] = '\0';
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return (s);
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}
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/*
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* Add a byte to the output command table.
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*/
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void
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add_cmd_char(c)
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int c;
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{
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if (currtable->pbuffer >= currtable->buffer + MAX_USERCMD)
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{
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error("too many commands");
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exit(1);
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}
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*(currtable->pbuffer)++ = c;
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}
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/*
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* Add a string to the output command table.
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*/
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void
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add_cmd_str(s)
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char *s;
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{
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for ( ; *s != '\0'; s++)
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add_cmd_char(*s);
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}
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/*
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* See if we have a special "control" line.
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*/
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int
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control_line(s)
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char *s;
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{
|
|
#define PREFIX(str,pat) (strncmp(str,pat,strlen(pat)) == 0)
|
|
|
|
if (PREFIX(s, "#line-edit"))
|
|
{
|
|
currtable = &edittable;
|
|
return (1);
|
|
}
|
|
if (PREFIX(s, "#command"))
|
|
{
|
|
currtable = &cmdtable;
|
|
return (1);
|
|
}
|
|
if (PREFIX(s, "#env"))
|
|
{
|
|
currtable = &vartable;
|
|
return (1);
|
|
}
|
|
if (PREFIX(s, "#stop"))
|
|
{
|
|
add_cmd_char('\0');
|
|
add_cmd_char(A_END_LIST);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Output some bytes.
|
|
*/
|
|
void
|
|
fputbytes(fd, buf, len)
|
|
FILE *fd;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
while (len-- > 0)
|
|
{
|
|
fwrite(buf, sizeof(char), 1, fd);
|
|
buf++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Output an integer, in special KRADIX form.
|
|
*/
|
|
void
|
|
fputint(fd, val)
|
|
FILE *fd;
|
|
unsigned int val;
|
|
{
|
|
char c;
|
|
|
|
if (val >= KRADIX*KRADIX)
|
|
{
|
|
fprintf(stderr, "error: integer too big (%d > %d)\n",
|
|
val, KRADIX*KRADIX);
|
|
exit(1);
|
|
}
|
|
c = val % KRADIX;
|
|
fwrite(&c, sizeof(char), 1, fd);
|
|
c = val / KRADIX;
|
|
fwrite(&c, sizeof(char), 1, fd);
|
|
}
|
|
|
|
/*
|
|
* Find an action, given the name of the action.
|
|
*/
|
|
int
|
|
findaction(actname)
|
|
char *actname;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; currtable->names[i].cn_name != NULL; i++)
|
|
if (strcmp(currtable->names[i].cn_name, actname) == 0)
|
|
return (currtable->names[i].cn_action);
|
|
error("unknown action");
|
|
return (A_INVALID);
|
|
}
|
|
|
|
void
|
|
error(s)
|
|
char *s;
|
|
{
|
|
fprintf(stderr, "line %d: %s\n", linenum, s);
|
|
errors++;
|
|
}
|
|
|
|
|
|
void
|
|
parse_cmdline(p)
|
|
char *p;
|
|
{
|
|
int cmdlen;
|
|
char *actname;
|
|
int action;
|
|
char *s;
|
|
char c;
|
|
|
|
/*
|
|
* Parse the command string and store it in the current table.
|
|
*/
|
|
cmdlen = 0;
|
|
do
|
|
{
|
|
s = tstr(&p, 1);
|
|
cmdlen += (int) strlen(s);
|
|
if (cmdlen > MAX_CMDLEN)
|
|
error("command too long");
|
|
else
|
|
add_cmd_str(s);
|
|
} while (*p != ' ' && *p != '\t' && *p != '\0');
|
|
/*
|
|
* Terminate the command string with a null byte.
|
|
*/
|
|
add_cmd_char('\0');
|
|
|
|
/*
|
|
* Skip white space between the command string
|
|
* and the action name.
|
|
* Terminate the action name with a null byte.
|
|
*/
|
|
p = skipsp(p);
|
|
if (*p == '\0')
|
|
{
|
|
error("missing action");
|
|
return;
|
|
}
|
|
actname = p;
|
|
p = skipnsp(p);
|
|
c = *p;
|
|
*p = '\0';
|
|
|
|
/*
|
|
* Parse the action name and store it in the current table.
|
|
*/
|
|
action = findaction(actname);
|
|
|
|
/*
|
|
* See if an extra string follows the action name.
|
|
*/
|
|
*p = c;
|
|
p = skipsp(p);
|
|
if (*p == '\0')
|
|
{
|
|
add_cmd_char(action);
|
|
} else
|
|
{
|
|
/*
|
|
* OR the special value A_EXTRA into the action byte.
|
|
* Put the extra string after the action byte.
|
|
*/
|
|
add_cmd_char(action | A_EXTRA);
|
|
while (*p != '\0')
|
|
add_cmd_str(tstr(&p, 0));
|
|
add_cmd_char('\0');
|
|
}
|
|
}
|
|
|
|
void
|
|
parse_varline(p)
|
|
char *p;
|
|
{
|
|
char *s;
|
|
|
|
do
|
|
{
|
|
s = tstr(&p, 0);
|
|
add_cmd_str(s);
|
|
} while (*p != ' ' && *p != '\t' && *p != '=' && *p != '\0');
|
|
/*
|
|
* Terminate the variable name with a null byte.
|
|
*/
|
|
add_cmd_char('\0');
|
|
|
|
p = skipsp(p);
|
|
if (*p++ != '=')
|
|
{
|
|
error("missing =");
|
|
return;
|
|
}
|
|
|
|
add_cmd_char(EV_OK|A_EXTRA);
|
|
|
|
p = skipsp(p);
|
|
while (*p != '\0')
|
|
{
|
|
s = tstr(&p, 0);
|
|
add_cmd_str(s);
|
|
}
|
|
add_cmd_char('\0');
|
|
}
|
|
|
|
/*
|
|
* Parse a line from the lesskey file.
|
|
*/
|
|
void
|
|
parse_line(line)
|
|
char *line;
|
|
{
|
|
char *p;
|
|
|
|
/*
|
|
* See if it is a control line.
|
|
*/
|
|
if (control_line(line))
|
|
return;
|
|
/*
|
|
* Skip leading white space.
|
|
* Replace the final newline with a null byte.
|
|
* Ignore blank lines and comments.
|
|
*/
|
|
p = clean_line(line);
|
|
if (*p == '\0')
|
|
return;
|
|
|
|
if (currtable == &vartable)
|
|
parse_varline(p);
|
|
else
|
|
parse_cmdline(p);
|
|
}
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
FILE *desc;
|
|
FILE *out;
|
|
char line[1024];
|
|
|
|
#ifdef WIN32
|
|
if (getenv("HOME") == NULL)
|
|
{
|
|
/*
|
|
* If there is no HOME environment variable,
|
|
* try the concatenation of HOMEDRIVE + HOMEPATH.
|
|
*/
|
|
char *drive = getenv("HOMEDRIVE");
|
|
char *path = getenv("HOMEPATH");
|
|
if (drive != NULL && path != NULL)
|
|
{
|
|
char *env = (char *) calloc(strlen(drive) +
|
|
strlen(path) + 6, sizeof(char));
|
|
strcpy(env, "HOME=");
|
|
strcat(env, drive);
|
|
strcat(env, path);
|
|
putenv(env);
|
|
}
|
|
}
|
|
#endif /* WIN32 */
|
|
|
|
/*
|
|
* Process command line arguments.
|
|
*/
|
|
parse_args(argc, argv);
|
|
init_tables();
|
|
|
|
/*
|
|
* Open the input file.
|
|
*/
|
|
if (strcmp(infile, "-") == 0)
|
|
desc = stdin;
|
|
else if ((desc = fopen(infile, "r")) == NULL)
|
|
{
|
|
#if HAVE_PERROR
|
|
perror(infile);
|
|
#else
|
|
fprintf(stderr, "Cannot open %s\n", infile);
|
|
#endif
|
|
usage();
|
|
}
|
|
|
|
/*
|
|
* Read and parse the input file, one line at a time.
|
|
*/
|
|
errors = 0;
|
|
linenum = 0;
|
|
while (fgets(line, sizeof(line), desc) != NULL)
|
|
{
|
|
++linenum;
|
|
parse_line(line);
|
|
}
|
|
|
|
/*
|
|
* Write the output file.
|
|
* If no output file was specified, use "$HOME/.less"
|
|
*/
|
|
if (errors > 0)
|
|
{
|
|
fprintf(stderr, "%d errors; no output produced\n", errors);
|
|
exit(1);
|
|
}
|
|
|
|
if (outfile == NULL)
|
|
outfile = getenv("LESSKEY");
|
|
if (outfile == NULL)
|
|
outfile = homefile(LESSKEYFILE);
|
|
if ((out = fopen(outfile, "wb")) == NULL)
|
|
{
|
|
#if HAVE_PERROR
|
|
perror(outfile);
|
|
#else
|
|
fprintf(stderr, "Cannot open %s\n", outfile);
|
|
#endif
|
|
exit(1);
|
|
}
|
|
|
|
/* File header */
|
|
fputbytes(out, fileheader, sizeof(fileheader));
|
|
|
|
/* Command key section */
|
|
fputbytes(out, cmdsection, sizeof(cmdsection));
|
|
fputint(out, cmdtable.pbuffer - cmdtable.buffer);
|
|
fputbytes(out, (char *)cmdtable.buffer, cmdtable.pbuffer-cmdtable.buffer);
|
|
/* Edit key section */
|
|
fputbytes(out, editsection, sizeof(editsection));
|
|
fputint(out, edittable.pbuffer - edittable.buffer);
|
|
fputbytes(out, (char *)edittable.buffer, edittable.pbuffer-edittable.buffer);
|
|
|
|
/* Environment variable section */
|
|
fputbytes(out, varsection, sizeof(varsection));
|
|
fputint(out, vartable.pbuffer - vartable.buffer);
|
|
fputbytes(out, (char *)vartable.buffer, vartable.pbuffer-vartable.buffer);
|
|
|
|
/* File trailer */
|
|
fputbytes(out, endsection, sizeof(endsection));
|
|
fputbytes(out, filetrailer, sizeof(filetrailer));
|
|
return (0);
|
|
}
|