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- /*
- * Copyright (c) 1984,1985,1989,1994 Mark Nudelman
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice in the documentation and/or other materials provided with
- * the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
- /*
- * 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:
- * #line-edit Signals the beginning of the line-editing
- * keys 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,
- "display-flag", A_DISP_OPTION,
- "display-option", A_DISP_OPTION,
- "end", A_GOEND,
- "examine", A_EXAMINE,
- "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-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,
- "next-file", A_NEXT_FILE,
- "noaction", A_NOACTION,
- "percent", A_PERCENT,
- "pipe", A_PIPE,
- "prev-file", A_PREV_FILE,
- "quit", A_QUIT,
- "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,
- "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,
- "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_RIGHT,
- "word-right", EC_W_LEFT,
- NULL, 0
- };
-
- struct table
- {
- struct cmdname *names;
- char *pbuffer;
- char buffer[MAX_USERCMD];
- };
-
- struct table cmdtable;
- struct table edittable;
- 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[] = { CMD_SECTION };
- char editsection[] = { EDIT_SECTION };
- char endsection[] = { END_SECTION };
-
- char *infile = NULL;
- char *outfile = NULL ;
-
- int linenum;
- int errors;
-
- extern char version[];
-
- /*
- * Figure out the name of a default file (in the user's HOME directory).
- */
- char *
- homefile(filename)
- char *filename;
- {
- char *p;
- char *pathname;
-
- p = getenv("HOME");
- if (p == NULL || *p == '\0')
- {
- fprintf(stderr, "cannot find $HOME - using current directory\n");
- pathname = calloc(strlen(filename) + 1, sizeof(char));
- strcpy(pathname, filename);
- } else
- {
- pathname = calloc(strlen(filename) + strlen(p) + 2, sizeof(char));
- strcpy(pathname, p);
- #if MSOFTC
- strcat(pathname, "\\");
- #else
- strcat(pathname, "/");
- #endif
- strcat(pathname, filename);
- }
- return (pathname);
- }
-
- /*
- * Parse command line arguments.
- */
- void
- parse_args(argc, argv)
- int argc;
- char **argv;
- {
- outfile = NULL;
- while (--argc > 0 && **(++argv) == '-' && argv[0][1] != '\0')
- {
- switch (argv[0][1])
- {
- case 'o':
- outfile = &argv[0][2];
- if (*outfile == '\0')
- {
- if (--argc <= 0)
- usage();
- outfile = *(++argv);
- }
- break;
- case '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;
- }
-
- /*
- * Parse one character of a string.
- */
- int
- tchar(pp)
- char **pp;
- {
- register char *p;
- register char ch;
- register int i;
-
- 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;
- return (ch);
- case 'b':
- *pp = p+1;
- return ('\r');
- case 'e':
- *pp = p+1;
- return (ESC);
- case 'n':
- *pp = p+1;
- return ('\n');
- case 'r':
- *pp = p+1;
- return ('\r');
- case 't':
- *pp = p+1;
- return ('\t');
- default:
- /*
- * Backslash followed by any other char
- * just means that char.
- */
- *pp = p+1;
- return (*p);
- }
- case '^':
- /*
- * Carat means CONTROL.
- */
- *pp = p+2;
- return (CONTROL(p[1]));
- }
- *pp = p+1;
- return (*p);
- }
-
- /*
- * 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] != '\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;
- }
-
- /*
- * See if we have a special "control" line.
- */
- int
- control_line(s)
- char *s;
- {
- #define PREFIX(str,pat) (strncmp(str,pat,strlen(pat)-1) == 0)
-
- if (PREFIX(s, "#line-edit"))
- {
- currtable = &edittable;
- return (1);
- }
- if (PREFIX(s, "#command"))
- {
- currtable = &cmdtable;
- 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);
- }
-
- usage()
- {
- fprintf(stderr, "usage: lesskey [-o output] [input]\n");
- exit(1);
- }
-
- void
- error(s)
- char *s;
- {
- fprintf(stderr, "line %d: %s\n", linenum, s);
- errors++;
- }
-
-
- /*
- * Parse a line from the lesskey file.
- */
- void
- parse_line(line)
- char *line;
- {
- char *p;
- int cmdlen;
- char *actname;
- int action;
- int c;
-
- /*
- * 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;
-
- /*
- * Parse the command string and store it in the current table.
- */
- cmdlen = 0;
- do
- {
- c = tchar(&p);
- if (++cmdlen > MAX_CMDLEN)
- error("command too long");
- else
- add_cmd_char(c);
- } 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_char(tchar(&p));
- add_cmd_char('\0');
- }
- }
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- FILE *desc;
- FILE *out;
- char line[200];
-
- /*
- * 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)
- {
- perror(infile);
- exit(1);
- }
-
- /*
- * 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 = homefile(LESSKEYFILE);
- if ((out = fopen(outfile, "w")) == NULL)
- {
- perror(outfile);
- 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);
-
- /* File trailer */
- fputbytes(out, endsection, sizeof(endsection));
- fputbytes(out, filetrailer, sizeof(filetrailer));
- exit(0);
- }
-