/* $NetBSD: lesskey.c,v 1.6 2023/10/06 07:26:47 simonb Exp $ */
/*
* Copyright (C) 1984-2023 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* lesskey [-o output] [input]
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Make a .less file.
* If no input file is specified, standard input is used.
* If no output file is specified, $HOME/.less is used.
*
* The .less file is used to specify (to "less") user-defined
* key bindings. Basically any sequence of 1 to MAX_CMDLEN
* keystrokes may be bound to an existing less function.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* The input file is an ascii file consisting of a
* sequence of lines of the form:
* string <whitespace> action [chars] <newline>
*
* "string" is a sequence of command characters which form
* the new user-defined command. The command
* characters may be:
* 1. The actual character itself.
* 2. A character preceded by ^ to specify a
* control character (e.g. ^X means control-X).
* 3. A backslash followed by one to three octal digits
* to specify a character by its octal value.
* 4. A backslash followed by b, e, n, r or t
* to specify \b, ESC, \n, \r or \t, respectively.
* 5. Any character (other than those mentioned above) preceded
* by a \ to specify the character itself (characters which
* must be preceded by \ include ^, \, and whitespace.
* "action" is the name of a "less" action, from the table below.
* "chars" is an optional sequence of characters which is treated
* as keyboard input after the command is executed.
*
* Blank lines and lines which start with # are ignored,
* except for the special control lines:
* #command Signals the beginning of the command
* keys section.
* #line-edit Signals the beginning of the line-editing
* keys section.
* #env Signals the beginning of the environment
* variable section.
* #stop Stops command parsing in less;
* causes all default keys to be disabled.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* The output file is a non-ascii file, consisting of a header,
* one or more sections, and a trailer.
* Each section begins with a section header, a section length word
* and the section data. Normally there are three sections:
* CMD_SECTION Definition of command keys.
* EDIT_SECTION Definition of editing keys.
* END_SECTION A special section header, with no
* length word or section data.
*
* Section data consists of zero or more byte sequences of the form:
* string <0> <action>
* or
* string <0> <action|A_EXTRA> chars <0>
*
* "string" is the command string.
* "<0>" is one null byte.
* "<action>" is one byte containing the action code (the A_xxx value).
* If action is ORed with A_EXTRA, the action byte is followed
* by the null-terminated "chars" string.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
#include "defines.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "lesskey.h"
#include "cmd.h"
char fileheader[] = {
C0_LESSKEY_MAGIC,
C1_LESSKEY_MAGIC,
C2_LESSKEY_MAGIC,
C3_LESSKEY_MAGIC
};
char filetrailer[] = {
C0_END_LESSKEY_MAGIC,
C1_END_LESSKEY_MAGIC,
C2_END_LESSKEY_MAGIC
};
char cmdsection[1] = { CMD_SECTION };
char editsection[1] = { EDIT_SECTION };
char varsection[1] = { VAR_SECTION };
char endsection[1] = { END_SECTION };
char *infile = NULL;
char *outfile = NULL ;
extern char version[];
static void usage(void)
{
fprintf(stderr, "usage: lesskey [-o output] [input]\n");
exit(1);
}
void lesskey_parse_error(char *s)
{
fprintf(stderr, "%s\n", s);
}
int lstrtoi(char *buf, char **ebuf, int radix)
{
return (int) strtol(buf, ebuf, radix);
}
void out_of_memory(void)
{
fprintf(stderr, "lesskey: cannot allocate memory\n");
exit(1);
}
void * ecalloc(int count, unsigned int size)
{
void *p;
p = calloc(count, size);
if (p == NULL)
out_of_memory();
return (p);
}
static char * mkpathname(char *dirname, char *filename)
{
char *pathname;
pathname = ecalloc(strlen(dirname) + strlen(filename) + 2, sizeof(char));
strcpy(pathname, dirname);
strcat(pathname, PATHNAME_SEP);
strcat(pathname, filename);
return (pathname);
}
/*
* Figure out the name of a default file (in the user's HOME directory).
*/
char * homefile(char *filename)
{
char *p;
char *pathname;
if ((p = getenv("HOME")) != NULL && *p != '\0')
pathname = mkpathname(p, filename);
#if OS2
else if ((p = getenv("INIT")) != NULL && *p != '\0')
pathname = mkpathname(p, filename);
#endif
else
{
fprintf(stderr, "cannot find $HOME - using current directory\n");
pathname = mkpathname(".", filename);
}
return (pathname);
}
/*
* Parse command line arguments.
*/
static void parse_args(int argc, char **argv)
{
char *arg;
outfile = NULL;
while (--argc > 0)
{
arg = *++argv;
if (arg[0] != '-')
/* Arg does not start with "-"; it's not an option. */
break;
if (arg[1] == '\0')
/* "-" means standard input. */
break;
if (arg[1] == '-' && arg[2] == '\0')
{
/* "--" means end of options. */
argc--;
argv++;
break;
}
switch (arg[1])
{
case '-':
if (strncmp(arg, "--output", 8) == 0)
{
if (arg[8] == '\0')
outfile = &arg[8];
else if (arg[8] == '=')
outfile = &arg[9];
else
usage();
goto opt_o;
}
if (strcmp(arg, "--version") == 0)
{
goto opt_V;
}
usage();
break;
case 'o':
outfile = &argv[0][2];
opt_o:
if (*outfile == '\0')
{
if (--argc <= 0)
usage();
outfile = *(++argv);
}
break;
case 'V':
opt_V:
printf("lesskey version %s\n", version);
exit(0);
default:
usage();
}
}
if (argc > 1)
usage();
/*
* Open the input file, or use DEF_LESSKEYINFILE if none specified.
*/
if (argc > 0)
infile = *argv;
}
/*
* Output some bytes.
*/
static void fputbytes(FILE *fd, char *buf, int len)
{
while (len-- > 0)
{
fwrite(buf, sizeof(char), 1, fd);
buf++;
}
}
/*
* Output an integer, in special KRADIX form.
*/
static void fputint(FILE *fd, unsigned int val)
{
char c;
if (val >= KRADIX*KRADIX)
{
fprintf(stderr, "error: cannot write %d, max %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);
}
int main(int argc, char *argv[])
{
struct lesskey_tables tables;
FILE *out;
int errors;
#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 *) ecalloc(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);
errors = parse_lesskey(infile, &tables);
if (errors)
{
fprintf(stderr, "%d errors; no output produced\n", errors);
return (1);
}
fprintf(stderr, "NOTE: lesskey is deprecated.\n It is no longer necessary to run lesskey,\n when using less version 582 and later.\n");
/*
* Write the output file.
* If no output file was specified, use "$HOME/.less"
*/
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
return (1);
}
/* File header */
fputbytes(out, fileheader, sizeof(fileheader));
/* Command key section */
fputbytes(out, cmdsection, sizeof(cmdsection));
fputint(out, tables.cmdtable.buf.end);
fputbytes(out, (char *)tables.cmdtable.buf.data, tables.cmdtable.buf.end);
/* Edit key section */
fputbytes(out, editsection, sizeof(editsection));
fputint(out, tables.edittable.buf.end);
fputbytes(out, (char *)tables.edittable.buf.data, tables.edittable.buf.end);
/* Environment variable section */
fputbytes(out, varsection, sizeof(varsection));
fputint(out, tables.vartable.buf.end);
fputbytes(out, (char *)tables.vartable.buf.data, tables.vartable.buf.end);
/* File trailer */
fputbytes(out, endsection, sizeof(endsection));
fputbytes(out, filetrailer, sizeof(filetrailer));
fclose(out);
return (0);
}
