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232 lines
5.8 KiB
C
232 lines
5.8 KiB
C
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)parser2.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include "parser.h"
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#include "var.h"
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#include "lcmd.h"
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#include "alias.h"
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/*
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* name == 0 means we don't have a function name but
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* want to parse the arguments anyway. flag == 0 in this case.
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*/
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p_function(name, v, flag)
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char *name;
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register struct value *v;
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{
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struct value t;
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register struct lcmd_tab *c = 0;
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register struct alias *a = 0;
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register struct lcmd_arg *ap; /* this arg */
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struct lcmd_arg *lp = 0; /* list arg */
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register i;
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struct value av[LCMD_NARG + 1];
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register struct value *vp;
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if (name != 0)
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if (c = lcmd_lookup(name))
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name = c->lc_name;
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else if (a = alias_lookup(name))
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name = a->a_name;
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else {
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p_error("%s: No such command or alias.", name);
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flag = 0;
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}
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for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
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vp->v_type = V_ERR;
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if (token == T_LP)
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(void) s_gettok();
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i = 0;
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for (;;) {
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ap = 0;
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vp = 0;
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if (token == T_COMMA) /* null argument */
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t.v_type = V_ERR;
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else {
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if (p_expr0(&t, flag) < 0)
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break;
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if (t.v_type == V_ERR)
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flag = 0;
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}
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if (token != T_ASSIGN) {
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if (i >= LCMD_NARG ||
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c != 0 && (ap = lp) == 0 &&
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(ap = c->lc_arg + i)->arg_name == 0) {
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p_error("%s: Too many arguments.", name);
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flag = 0;
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} else
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vp = &av[i++];
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} else {
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char *tmp;
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if (p_convstr(&t) < 0)
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goto abort;
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tmp = t.v_type == V_STR ? t.v_str : 0;
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(void) s_gettok();
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if (p_expr(&t, flag) < 0) {
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if (tmp)
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str_free(tmp);
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p_synerror();
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goto abort;
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}
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if (t.v_type == V_ERR)
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flag = 0;
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if (tmp) {
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if (c == 0) {
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/* an aliase */
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p_error("%s: Bad alias syntax.", name);
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flag = 0;
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} else {
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for (ap = c->lc_arg, vp = av;
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ap != 0 && ap->arg_name != 0 &&
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(*ap->arg_name == '\0' ||
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!str_match(tmp, ap->arg_name,
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ap->arg_minlen));
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ap++, vp++)
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;
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if (ap == 0 || ap->arg_name == 0) {
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p_error("%s: Unknown argument \"%s\".",
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name, tmp);
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flag = 0;
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ap = 0;
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vp = 0;
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}
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}
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str_free(tmp);
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}
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}
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if (ap != 0) {
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if (ap->arg_flags & ARG_LIST) {
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i = vp - av + 1;
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lp = ap;
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}
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if (vp->v_type != V_ERR) {
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if (*ap->arg_name)
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p_error("%s: Argument %d (%s) duplicated.",
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name, vp - av + 1,
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ap->arg_name);
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else
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p_error("%s: Argument %d duplicated.",
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name, vp - av + 1);
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flag = 0;
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vp = 0;
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} else if (t.v_type == V_ERR) {
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/* do nothing */
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} else if ((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
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t.v_type != V_NUM ||
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(ap->arg_flags&ARG_TYPE) == ARG_STR &&
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t.v_type != V_STR) {
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if (*ap->arg_name)
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p_error("%s: Argument %d (%s) type mismatch.",
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name, vp - av + 1,
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ap->arg_name);
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else
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p_error("%s: Argument %d type mismatch.",
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name, vp - av + 1);
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flag = 0;
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vp = 0;
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}
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}
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if (vp != 0)
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*vp = t;
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else
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val_free(t);
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if (token == T_COMMA)
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(void) s_gettok();
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}
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if (p_erred())
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flag = 0;
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if (token == T_RP)
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(void) s_gettok();
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else if (token != T_EOL && token != T_EOF)
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flag = 0; /* look for legal follow set */
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v->v_type = V_ERR;
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if (flag)
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if (c != 0)
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(*c->lc_func)(v, av);
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else
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if (a->a_flags & A_INUSE)
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p_error("%s: Recursive alias.", a->a_name);
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else {
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a->a_flags |= A_INUSE;
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if (dolongcmd(a->a_buf, av, i) < 0)
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p_memerror();
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a->a_flags &= ~A_INUSE;
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}
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if (p_abort()) {
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val_free(*v);
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v->v_type = V_ERR;
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goto abort;
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}
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for (vp = av; vp < &av[LCMD_NARG]; vp++)
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val_free(*vp);
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return 0;
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abort:
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for (vp = av; vp < &av[LCMD_NARG]; vp++)
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val_free(*vp);
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return -1;
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}
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p_assign(name, v, flag)
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char *name;
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struct value *v;
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char flag;
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{
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(void) s_gettok();
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if (p_expr(v, flag) < 0) {
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p_synerror();
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return -1;
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}
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switch (v->v_type) {
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case V_STR:
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case V_NUM:
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if (flag && var_set(name, v) == 0) {
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p_memerror();
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val_free(*v);
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return -1;
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}
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break;
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}
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return 0;
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}
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