| Current Path : /usr/src/contrib/less/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/less/lesskey.c |
/*
* Copyright (C) 1984-2011 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 about less, or for information on how to
* contact the author, 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 "less.h"
#include "lesskey.h"
#include "cmd.h"
struct cmdname
{
char *cn_name;
int cn_action;
};
struct cmdname cmdnames[] =
{
{ "back-bracket", A_B_BRACKET },
{ "back-line", A_B_LINE },
{ "back-line-force", A_BF_LINE },
{ "back-screen", A_B_SCREEN },
{ "back-scroll", A_B_SCROLL },
{ "back-search", A_B_SEARCH },
{ "back-window", A_B_WINDOW },
{ "debug", A_DEBUG },
{ "digit", A_DIGIT },
{ "display-flag", A_DISP_OPTION },
{ "display-option", A_DISP_OPTION },
{ "end", A_GOEND },
{ "examine", A_EXAMINE },
{ "filter", A_FILTER },
{ "first-cmd", A_FIRSTCMD },
{ "firstcmd", A_FIRSTCMD },
{ "flush-repaint", A_FREPAINT },
{ "forw-bracket", A_F_BRACKET },
{ "forw-forever", A_F_FOREVER },
{ "forw-line", A_F_LINE },
{ "forw-line-force", A_FF_LINE },
{ "forw-screen", A_F_SCREEN },
{ "forw-screen-force", A_FF_SCREEN },
{ "forw-scroll", A_F_SCROLL },
{ "forw-search", A_F_SEARCH },
{ "forw-window", A_F_WINDOW },
{ "goto-end", A_GOEND },
{ "goto-line", A_GOLINE },
{ "goto-mark", A_GOMARK },
{ "help", A_HELP },
{ "index-file", A_INDEX_FILE },
{ "invalid", A_UINVALID },
{ "left-scroll", A_LSHIFT },
{ "next-file", A_NEXT_FILE },
{ "next-tag", A_NEXT_TAG },
{ "noaction", A_NOACTION },
{ "percent", A_PERCENT },
{ "pipe", A_PIPE },
{ "prev-file", A_PREV_FILE },
{ "prev-tag", A_PREV_TAG },
{ "quit", A_QUIT },
{ "remove-file", A_REMOVE_FILE },
{ "repaint", A_REPAINT },
{ "repaint-flush", A_FREPAINT },
{ "repeat-search", A_AGAIN_SEARCH },
{ "repeat-search-all", A_T_AGAIN_SEARCH },
{ "reverse-search", A_REVERSE_SEARCH },
{ "reverse-search-all", A_T_REVERSE_SEARCH },
{ "right-scroll", A_RSHIFT },
{ "set-mark", A_SETMARK },
{ "shell", A_SHELL },
{ "status", A_STAT },
{ "toggle-flag", A_OPT_TOGGLE },
{ "toggle-option", A_OPT_TOGGLE },
{ "undo-hilite", A_UNDO_SEARCH },
{ "version", A_VERSION },
{ "visual", A_VISUAL },
{ NULL, 0 }
};
struct cmdname editnames[] =
{
{ "back-complete", EC_B_COMPLETE },
{ "backspace", EC_BACKSPACE },
{ "delete", EC_DELETE },
{ "down", EC_DOWN },
{ "end", EC_END },
{ "expand", EC_EXPAND },
{ "forw-complete", EC_F_COMPLETE },
{ "home", EC_HOME },
{ "insert", EC_INSERT },
{ "invalid", EC_UINVALID },
{ "kill-line", EC_LINEKILL },
{ "abort", EC_ABORT },
{ "left", EC_LEFT },
{ "literal", EC_LITERAL },
{ "right", EC_RIGHT },
{ "up", EC_UP },
{ "word-backspace", EC_W_BACKSPACE },
{ "word-delete", EC_W_DELETE },
{ "word-left", EC_W_LEFT },
{ "word-right", EC_W_RIGHT },
{ NULL, 0 }
};
struct table
{
struct cmdname *names;
char *pbuffer;
char buffer[MAX_USERCMD];
};
struct table cmdtable;
struct table edittable;
struct table vartable;
struct table *currtable = &cmdtable;
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 ;
int linenum;
int errors;
extern char version[];
void
usage()
{
fprintf(stderr, "usage: lesskey [-o output] [input]\n");
exit(1);
}
char *
mkpathname(dirname, filename)
char *dirname;
char *filename;
{
char *pathname;
pathname = calloc(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(filename)
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.
*/
void
parse_args(argc, argv)
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;
else
infile = homefile(DEF_LESSKEYINFILE);
}
/*
* Initialize data structures.
*/
void
init_tables()
{
cmdtable.names = cmdnames;
cmdtable.pbuffer = cmdtable.buffer;
edittable.names = editnames;
edittable.pbuffer = edittable.buffer;
vartable.names = NULL;
vartable.pbuffer = vartable.buffer;
}
/*
* Parse one character of a string.
*/
char *
tstr(pp, xlate)
char **pp;
int xlate;
{
register char *p;
register char ch;
register int i;
static char buf[10];
static char tstr_control_k[] =
{ SK_SPECIAL_KEY, SK_CONTROL_K, 6, 1, 1, 1, '\0' };
p = *pp;
switch (*p)
{
case '\\':
++p;
switch (*p)
{
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
/*
* Parse an octal number.
*/
ch = 0;
i = 0;
do
ch = 8*ch + (*p - '0');
while (*++p >= '0' && *p <= '7' && ++i < 3);
*pp = p;
if (xlate && ch == CONTROL('K'))
return tstr_control_k;
buf[0] = ch;
buf[1] = '\0';
return (buf);
case 'b':
*pp = p+1;
return ("\b");
case 'e':
*pp = p+1;
buf[0] = ESC;
buf[1] = '\0';
return (buf);
case 'n':
*pp = p+1;
return ("\n");
case 'r':
*pp = p+1;
return ("\r");
case 't':
*pp = p+1;
return ("\t");
case 'k':
if (xlate)
{
switch (*++p)
{
case 'u': ch = SK_UP_ARROW; break;
case 'd': ch = SK_DOWN_ARROW; break;
case 'r': ch = SK_RIGHT_ARROW; break;
case 'l': ch = SK_LEFT_ARROW; break;
case 'U': ch = SK_PAGE_UP; break;
case 'D': ch = SK_PAGE_DOWN; break;
case 'h': ch = SK_HOME; break;
case 'e': ch = SK_END; break;
case 'x': ch = SK_DELETE; break;
default:
error("illegal char after \\k");
*pp = p+1;
return ("");
}
*pp = p+1;
buf[0] = SK_SPECIAL_KEY;
buf[1] = ch;
buf[2] = 6;
buf[3] = 1;
buf[4] = 1;
buf[5] = 1;
buf[6] = '\0';
return (buf);
}
/* FALLTHRU */
default:
/*
* Backslash followed by any other char
* just means that char.
*/
*pp = p+1;
buf[0] = *p;
buf[1] = '\0';
if (xlate && buf[0] == CONTROL('K'))
return tstr_control_k;
return (buf);
}
case '^':
/*
* Carat means CONTROL.
*/
*pp = p+2;
buf[0] = CONTROL(p[1]);
buf[1] = '\0';
if (buf[0] == CONTROL('K'))
return tstr_control_k;
return (buf);
}
*pp = p+1;
buf[0] = *p;
buf[1] = '\0';
if (xlate && buf[0] == CONTROL('K'))
return tstr_control_k;
return (buf);
}
/*
* Skip leading spaces in a string.
*/
public char *
skipsp(s)
register char *s;
{
while (*s == ' ' || *s == '\t')
s++;
return (s);
}
/*
* Skip non-space characters in a string.
*/
public char *
skipnsp(s)
register char *s;
{
while (*s != '\0' && *s != ' ' && *s != '\t')
s++;
return (s);
}
/*
* Clean up an input line:
* strip off the trailing newline & any trailing # comment.
*/
char *
clean_line(s)
char *s;
{
register int i;
s = skipsp(s);
for (i = 0; s[i] != '\n' && s[i] != '\r' && s[i] != '\0'; i++)
if (s[i] == '#' && (i == 0 || s[i-1] != '\\'))
break;
s[i] = '\0';
return (s);
}
/*
* Add a byte to the output command table.
*/
void
add_cmd_char(c)
int c;
{
if (currtable->pbuffer >= currtable->buffer + MAX_USERCMD)
{
error("too many commands");
exit(1);
}
*(currtable->pbuffer)++ = c;
}
/*
* Add a string to the output command table.
*/
void
add_cmd_str(s)
char *s;
{
for ( ; *s != '\0'; s++)
add_cmd_char(*s);
}
/*
* See if we have a special "control" line.
*/
int
control_line(s)
char *s;
{
#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 += 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);
}