parse.c

/*      $NetBSD: parse.c,v 1.26 2011/08/16 16:25:15 christos Exp $      */

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Christos Zoulas of Cornell University.
 *
 * 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, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#include "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)parse.c     8.1 (Berkeley) 6/4/93";
#else
#endif
#endif /* not lint && not SCCSID */

/*
 * parse.c: parse an editline extended command
 *
 * commands are:
 *
 *      bind
 *      echotc
 *      edit
 *      gettc
 *      history
 *      settc
 *      setty
 */
#include "el.h"
#include <stdlib.h>

private const struct {
        const Char *name;
        int (*func)(EditLine *, int, const Char **);
} cmds[] = {
        { STR("bind"),          map_bind        },
        { STR("echotc"),        terminal_echotc },
        { STR("edit"),          el_editmode     },
        { STR("history"),       hist_command    },
        { STR("telltc"),        terminal_telltc },
        { STR("settc"),         terminal_settc  },
        { STR("setty"),         tty_stty        },
        { NULL,                 NULL            }
};


/* parse_line():
 *      Parse a line and dispatch it
 */
protected int
parse_line(EditLine *el, const Char *line)
{
        const Char **argv;
        int argc;
        TYPE(Tokenizer) *tok;

        tok = FUN(tok,init)(NULL);
        FUN(tok,str)(tok, line, &argc, &argv);
        argc = FUN(el,parse)(el, argc, argv);
        FUN(tok,end)(tok);
        return argc;
}


/* el_parse():
 *      Command dispatcher
 */
public int
FUN(el,parse)(EditLine *el, int argc, const Char *argv[])
{
        const Char *ptr;
        int i;

        if (argc < 1)
                return -1;
        ptr = Strchr(argv[0], ':');
        if (ptr != NULL) {
                Char *tprog;
                size_t l;

                if (ptr == argv[0])
                        return 0;
                l = (size_t)(ptr - argv[0] - 1);
                tprog = el_malloc((l + 1) * sizeof(*tprog));
                if (tprog == NULL)
                        return 0;
                (void) Strncpy(tprog, argv[0], l);
                tprog[l] = '\0';
                ptr++;
                l = (size_t)el_match(el->el_prog, tprog);
                el_free(tprog);
                if (!l)
                        return 0;
        } else
                ptr = argv[0];

        for (i = 0; cmds[i].name != NULL; i++)
                if (Strcmp(cmds[i].name, ptr) == 0) {
                        i = (*cmds[i].func) (el, argc, argv);
                        return -i;
                }
        return -1;
}


/* parse__escape():
 *      Parse a string of the form ^<char> <odigit> <char> \U+xxxx and return
 *      the appropriate character or -1 if the escape is not valid
 */
protected int
parse__escape(const Char **ptr)
{
        const Char *p;
        Int c;

        p = *ptr;

        if (p[1] == 0)
                return -1;

        if (*p == '\\') {
                p++;
                switch (*p) {
                case 'a':
                        c = '\007';     /* Bell */
                        break;
                case 'b':
                        c = '\010';     /* Backspace */
                        break;
                case 't':
                        c = '\011';     /* Horizontal Tab */
                        break;
                case 'n':
                        c = '\012';     /* New Line */
                        break;
                case 'v':
                        c = '\013';     /* Vertical Tab */
                        break;
                case 'f':
                        c = '\014';     /* Form Feed */
                        break;
                case 'r':
                        c = '\015';     /* Carriage Return */
                        break;
                case 'e':
                        c = '\033';     /* Escape */
                        break;
                case 'U':               /* Unicode \U+xxxx or \U+xxxxx format */
                {
                        int i;
                        const Char hex[] = STR("0123456789ABCDEF");
                        const Char *h;
                        ++p;
                        if (*p++ != '+')
                                return -1;
                        c = 0;
                        for (i = 0; i < 5; ++i) {
                                h = Strchr(hex, *p++);
                                if (!h && i < 4)
                                        return -1;
                                else if (h)
                                        c = (c << 4) | ((int)(h - hex));
                                else
                                        --p;
                        }
                        if (c > 0x10FFFF) /* outside valid character range */
                                return -1;
                        break;
                }
                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                {
                        int cnt, ch;

                        for (cnt = 0, c = 0; cnt < 3; cnt++) {
                                ch = *p++;
                                if (ch < '0' || ch > '7') {
                                        p--;
                                        break;
                                }
                                c = (c << 3) | (ch - '0');
                        }
                        if ((c & (wint_t)0xffffff00) != (wint_t)0)
                                return -1;
                        --p;
                        break;
                }
                default:
                        c = *p;
                        break;
                }
        } else if (*p == '^') {
                p++;
                c = (*p == '?') ? '\177' : (*p & 0237);
        } else
                c = *p;
        *ptr = ++p;
        return c;
}

/* parse__string():
 *      Parse the escapes from in and put the raw string out
 */
protected Char *
parse__string(Char *out, const Char *in)
{
        Char *rv = out;
        int n;

        for (;;)
                switch (*in) {
                case '\0':
                        *out = '\0';
                        return rv;

                case '\\':
                case '^':
                        if ((n = parse__escape(&in)) == -1)
                                return NULL;
                        *out++ = n;
                        break;

                case 'M':
                        if (in[1] == '-' && in[2] != '\0') {
                                *out++ = '\033';
                                in += 2;
                                break;
                        }
                        /*FALLTHROUGH*/

                default:
                        *out++ = *in++;
                        break;
                }
}


/* parse_cmd():
 *      Return the command number for the command string given
 *      or -1 if one is not found
 */
protected int
parse_cmd(EditLine *el, const Char *cmd)
{
        el_bindings_t *b;

        for (b = el->el_map.help; b->name != NULL; b++)
                if (Strcmp(b->name, cmd) == 0)
                        return b->func;
        return -1;
}