usr.bin/window/parser2.c

   1 /*      $NetBSD: parser2.c,v 1.10 2006/05/02 22:35:07 christos Exp $    */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)parser2.c   8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: parser2.c,v 1.10 2006/05/02 22:35:07 christos Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #define EXTERN
  45 #include "ww.h"
  46 #include "defs.h"
  47 #include "alias.h"
  48 #undef  EXTERN
  49 #include "parser.h"
  50 #include "var.h"
  51 #include "lcmd.h"
  52
  53 /*
  54  * name == 0 means we don't have a function name but
  55  * want to parse the arguments anyway.  flag == 0 in this case.
  56  */
  57 int
  58 p_function(const char *name, struct value *v, int flag)
  59 {
  60         struct value t;
  61         struct lcmd_tab *c = 0;
  62         struct alias *a = 0;
  63         struct lcmd_arg *ap;                    /* this arg */
  64         struct lcmd_arg *lp = 0;                /* list arg */
  65         int i;
  66         struct value av[LCMD_NARG + 1];
  67         struct value *vp;
  68
  69         if (name != 0) {
  70                 if ((c = lcmd_lookup(name)))
  71                         name = c->lc_name;
  72                 else if ((a = alias_lookup(name)))
  73                         name = a->a_name;
  74                 else {
  75                         p_error("%s: No such command or alias.", name);
  76                         flag = 0;
  77                 }
  78         }
  79         for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
  80                 vp->v_type = V_ERR;
  81
  82         if (token == T_LP)
  83                 (void) s_gettok();
  84         i = 0;
  85         for (;;) {
  86                 ap = 0;
  87                 vp = 0;
  88                 if (token == T_COMMA)           /* null argument */
  89                         t.v_type = V_ERR;
  90                 else {
  91                         if (p_expr0(&t, flag) < 0)
  92                                 break;
  93                         if (t.v_type == V_ERR)
  94                                 flag = 0;
  95                 }
  96                 if (token != T_ASSIGN) {
  97                         if (i >= LCMD_NARG ||
  98                             (c != 0 && (ap = lp) == 0 &&
  99                             (ap = c->lc_arg + i)->arg_name == 0)) {
 100                                 p_error("%s: Too many arguments.", name);
 101                                 flag = 0;
 102                         } else
 103                                 vp = &av[i++];
 104                 } else {
 105                         char *tmp;
 106                         if (p_convstr(&t) < 0)
 107                                 goto abort;
 108                         tmp = t.v_type == V_STR ? t.v_str : 0;
 109                         (void) s_gettok();
 110                         if (p_expr(&t, flag) < 0) {
 111                                 if (tmp)
 112                                         str_free(tmp);
 113                                 p_synerror();
 114                                 goto abort;
 115                         }
 116                         if (t.v_type == V_ERR)
 117                                 flag = 0;
 118                         if (tmp) {
 119                                 if (c == 0) {
 120                                         /* an aliase */
 121                                         p_error("%s: Bad alias syntax.", name);
 122                                         flag = 0;
 123                                 } else {
 124                                         for (ap = c->lc_arg, vp = av;
 125                                              ap != 0 && ap->arg_name != 0 &&
 126                                              (*ap->arg_name == '\0' ||
 127                                               !str_match(tmp, ap->arg_name,
 128                                                         ap->arg_minlen));
 129                                              ap++, vp++)
 130                                                 ;
 131                                         if (ap == 0 || ap->arg_name == 0) {
 132                                                 p_error("%s: Unknown argument \"%s\".",
 133                                                         name, tmp);
 134                                                 flag = 0;
 135                                                 ap = 0;
 136                                                 vp = 0;
 137                                         }
 138                                 }
 139                                 str_free(tmp);
 140                         }
 141                 }
 142                 if (ap != 0) {
 143                         if (ap->arg_flags & ARG_LIST) {
 144                                 i = vp - av + 1;
 145                                 lp = ap;
 146                         }
 147                         if (vp && vp->v_type != V_ERR) {
 148                                 if (*ap->arg_name)
 149                                         p_error("%s: Argument %d (%s) duplicated.",
 150                                                 name, (int)(vp - av + 1),
 151                                                 ap->arg_name);
 152                                 else
 153                                         p_error("%s: Argument %d duplicated.",
 154                                                 name, (int)(vp - av + 1));
 155                                 flag = 0;
 156                                 vp = 0;
 157                         } else if (t.v_type == V_ERR) {
 158                                 /* do nothing */
 159                         } else if (((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
 160                                     t.v_type != V_NUM) ||
 161                                    ((ap->arg_flags&ARG_TYPE) == ARG_STR &&
 162                                    t.v_type != V_STR)) {
 163                                 if (*ap->arg_name)
 164                                         p_error("%s: Argument %d (%s) type mismatch.",
 165                                                 name, (int)(vp - av + 1),
 166                                                 ap->arg_name);
 167                                 else
 168                                         p_error("%s: Argument %d type mismatch.",
 169                                                 name, (int)(vp - av + 1));
 170                                 flag = 0;
 171                                 vp = 0;
 172                         }
 173                 }
 174                 if (vp != 0)
 175                         *vp = t;
 176                 else
 177                         val_free(t);
 178                 if (token == T_COMMA)
 179                         (void) s_gettok();
 180         }
 181
 182         if (p_erred())
 183                 flag = 0;
 184         if (token == T_RP)
 185                 (void) s_gettok();
 186         else if (token != T_EOL && token != T_EOF)
 187                 flag = 0;               /* look for legal follow set */
 188         v->v_type = V_ERR;
 189         if (flag) {
 190                 if (c != 0)
 191                         (*c->lc_func)(v, av);
 192                 else {
 193                         if (a->a_flags & A_INUSE)
 194                                 p_error("%s: Recursive alias.", a->a_name);
 195                         else {
 196                                 a->a_flags |= A_INUSE;
 197                                 if (dolongcmd(a->a_buf, av, i) < 0)
 198                                         p_memerror();
 199                                 a->a_flags &= ~A_INUSE;
 200                         }
 201                 }
 202         }
 203         if (p_abort()) {
 204                 val_free(*v);
 205                 v->v_type = V_ERR;
 206                 goto abort;
 207         }
 208         for (vp = av; vp < &av[LCMD_NARG]; vp++)
 209                 val_free(*vp);
 210         return 0;
 211 abort:
 212         for (vp = av; vp < &av[LCMD_NARG]; vp++)
 213                 val_free(*vp);
 214         return -1;
 215 }
 216
 217 int
 218 p_assign(const char *name, struct value *v, int flag)
 219 {
 220         (void) s_gettok();
 221
 222         if (p_expr(v, flag) < 0) {
 223                 p_synerror();
 224                 return -1;
 225         }
 226         switch (v->v_type) {
 227         case V_STR:
 228         case V_NUM:
 229                 if (name && flag && var_set(name, v) == 0) {
 230                         p_memerror();
 231                         val_free(*v);
 232                         return -1;
 233                 }
 234                 break;
 235         }
 236         return 0;
 237 }