371 lines
8.9 KiB
C
371 lines
8.9 KiB
C
/*
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* Copyright (C) 1984-2021 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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "lesskey.h"
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#include "cmd.h"
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#include "defines.h"
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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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extern char version[];
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static void
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usage(void)
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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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void
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lesskey_parse_error(s)
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char *s;
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{
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fprintf(stderr, "%s\n", s);
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}
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void *
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ecalloc(count, size)
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int count;
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unsigned int size;
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{
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void *p;
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p = calloc(count, size);
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if (p != NULL)
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return (p);
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fprintf(stderr, "lesskey: cannot allocate %d bytes of memory\n", count*size);
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exit(1);
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}
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static 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 = ecalloc(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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static 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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}
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/*
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* Output some bytes.
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*/
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static void
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fputbytes(fd, buf, len)
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FILE *fd;
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char *buf;
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int len;
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{
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while (len-- > 0)
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{
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fwrite(buf, sizeof(char), 1, fd);
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buf++;
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}
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}
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/*
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* Output an integer, in special KRADIX form.
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*/
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static void
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fputint(fd, val)
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FILE *fd;
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unsigned int val;
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{
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char c;
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if (val >= KRADIX*KRADIX)
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{
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fprintf(stderr, "error: cannot write %d, max %d\n",
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val, KRADIX*KRADIX);
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exit(1);
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}
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c = val % KRADIX;
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fwrite(&c, sizeof(char), 1, fd);
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c = val / KRADIX;
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fwrite(&c, sizeof(char), 1, fd);
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct lesskey_tables tables;
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FILE *out;
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int errors;
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#ifdef WIN32
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if (getenv("HOME") == NULL)
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{
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/*
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* If there is no HOME environment variable,
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* try the concatenation of HOMEDRIVE + HOMEPATH.
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*/
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char *drive = getenv("HOMEDRIVE");
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char *path = getenv("HOMEPATH");
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if (drive != NULL && path != NULL)
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{
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char *env = (char *) ecalloc(strlen(drive) +
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strlen(path) + 6, sizeof(char));
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strcpy(env, "HOME=");
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strcat(env, drive);
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strcat(env, path);
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putenv(env);
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}
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}
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#endif /* WIN32 */
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/*
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* Process command line arguments.
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*/
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parse_args(argc, argv);
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errors = parse_lesskey(infile, &tables);
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if (errors)
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{
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fprintf(stderr, "%d errors; no output produced\n", errors);
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return (1);
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}
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fprintf(stderr, "NOTE: lesskey is deprecated.\n It is no longer necessary to run lesskey,\n when using less version 582 and later.\n");
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/*
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* Write the output file.
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* If no output file was specified, use "$HOME/.less"
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*/
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if (outfile == NULL)
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outfile = getenv("LESSKEY");
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if (outfile == NULL)
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outfile = homefile(LESSKEYFILE);
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if ((out = fopen(outfile, "wb")) == NULL)
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{
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#if HAVE_PERROR
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perror(outfile);
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#else
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fprintf(stderr, "Cannot open %s\n", outfile);
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#endif
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return (1);
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}
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/* File header */
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fputbytes(out, fileheader, sizeof(fileheader));
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/* Command key section */
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fputbytes(out, cmdsection, sizeof(cmdsection));
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fputint(out, tables.cmdtable.buf.end);
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fputbytes(out, (char *)tables.cmdtable.buf.data, tables.cmdtable.buf.end);
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/* Edit key section */
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fputbytes(out, editsection, sizeof(editsection));
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fputint(out, tables.edittable.buf.end);
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fputbytes(out, (char *)tables.edittable.buf.data, tables.edittable.buf.end);
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/* Environment variable section */
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fputbytes(out, varsection, sizeof(varsection));
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fputint(out, tables.vartable.buf.end);
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fputbytes(out, (char *)tables.vartable.buf.data, tables.vartable.buf.end);
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/* File trailer */
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fputbytes(out, endsection, sizeof(endsection));
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fputbytes(out, filetrailer, sizeof(filetrailer));
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return (0);
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}
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