usr.bin/window/parser2.c

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