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  * @(#)parser2.c        8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/parser2.c,v 1.1.1.1.14.1 2001/05/17 09:45:00 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/parser2.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include "parser.h"
  42 #include "var.h"
  43 #include "lcmd.h"
  44 #include "alias.h"
  45
  46 /*
  47  * name == 0 means we don't have a function name but
  48  * want to parse the arguments anyway.  flag == 0 in this case.
  49  */
  50 p_function(name, v, flag)
  51 char *name;
  52 register struct value *v;
  53 {
  54         struct value t;
  55         register struct lcmd_tab *c = 0;
  56         register struct alias *a = 0;
  57         register struct lcmd_arg *ap;           /* this arg */
  58         struct lcmd_arg *lp = 0;                /* list arg */
  59         register i;
  60         struct value av[LCMD_NARG + 1];
  61         register struct value *vp;
  62
  63         if (name != 0)
  64                 if (c = lcmd_lookup(name))
  65                         name = c->lc_name;
  66                 else if (a = alias_lookup(name))
  67                         name = a->a_name;
  68                 else {
  69                         p_error("%s: No such command or alias.", name);
  70                         flag = 0;
  71                 }
  72
  73         for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
  74                 vp->v_type = V_ERR;
  75
  76         if (token == T_LP)
  77                 (void) s_gettok();
  78         i = 0;
  79         for (;;) {
  80                 ap = 0;
  81                 vp = 0;
  82                 if (token == T_COMMA)           /* null argument */
  83                         t.v_type = V_ERR;
  84                 else {
  85                         if (p_expr0(&t, flag) < 0)
  86                                 break;
  87                         if (t.v_type == V_ERR)
  88                                 flag = 0;
  89                 }
  90                 if (token != T_ASSIGN) {
  91                         if (i >= LCMD_NARG ||
  92                             c != 0 && (ap = lp) == 0 &&
  93                             (ap = c->lc_arg + i)->arg_name == 0) {
  94                                 p_error("%s: Too many arguments.", name);
  95                                 flag = 0;
  96                         } else
  97                                 vp = &av[i++];
  98                 } else {
  99                         char *tmp;
 100                         if (p_convstr(&t) < 0)
 101                                 goto abort;
 102                         tmp = t.v_type == V_STR ? t.v_str : 0;
 103                         (void) s_gettok();
 104                         if (p_expr(&t, flag) < 0) {
 105                                 if (tmp)
 106                                         str_free(tmp);
 107                                 p_synerror();
 108                                 goto abort;
 109                         }
 110                         if (t.v_type == V_ERR)
 111                                 flag = 0;
 112                         if (tmp) {
 113                                 if (c == 0) {
 114                                         /* an aliase */
 115                                         p_error("%s: Bad alias syntax.", name);
 116                                         flag = 0;
 117                                 } else {
 118                                         for (ap = c->lc_arg, vp = av;
 119                                              ap != 0 && ap->arg_name != 0 &&
 120                                              (*ap->arg_name == '\0' ||
 121                                               !str_match(tmp, ap->arg_name,
 122                                                         ap->arg_minlen));
 123                                              ap++, vp++)
 124                                                 ;
 125                                         if (ap == 0 || ap->arg_name == 0) {
 126                                                 p_error("%s: Unknown argument \"%s\".",
 127                                                         name, tmp);
 128                                                 flag = 0;
 129                                                 ap = 0;
 130                                                 vp = 0;
 131                                         }
 132                                 }
 133                                 str_free(tmp);
 134                         }
 135                 }
 136                 if (ap != 0) {
 137                         if (ap->arg_flags & ARG_LIST) {
 138                                 i = vp - av + 1;
 139                                 lp = ap;
 140                         }
 141                         if (vp->v_type != V_ERR) {
 142                                 if (*ap->arg_name)
 143                                         p_error("%s: Argument %d (%s) duplicated.",
 144                                                 name, vp - av + 1,
 145                                                 ap->arg_name);
 146                                 else
 147                                         p_error("%s: Argument %d duplicated.",
 148                                                 name, vp - av + 1);
 149                                 flag = 0;
 150                                 vp = 0;
 151                         } else if (t.v_type == V_ERR) {
 152                                 /* do nothing */
 153                         } else if ((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
 154                                    t.v_type != V_NUM ||
 155                                    (ap->arg_flags&ARG_TYPE) == ARG_STR &&
 156                                    t.v_type != V_STR) {
 157                                 if (*ap->arg_name)
 158                                         p_error("%s: Argument %d (%s) type mismatch.",
 159                                                 name, vp - av + 1,
 160                                                 ap->arg_name);
 161                                 else
 162                                         p_error("%s: Argument %d type mismatch.",
 163                                                 name, vp - av + 1);
 164                                 flag = 0;
 165                                 vp = 0;
 166                         }
 167                 }
 168                 if (vp != 0)
 169                         *vp = t;
 170                 else
 171                         val_free(t);
 172                 if (token == T_COMMA)
 173                         (void) s_gettok();
 174         }
 175
 176         if (p_erred())
 177                 flag = 0;
 178         if (token == T_RP)
 179                 (void) s_gettok();
 180         else if (token != T_EOL && token != T_EOF)
 181                 flag = 0;               /* look for legal follow set */
 182         v->v_type = V_ERR;
 183         if (flag)
 184                 if (c != 0)
 185                         (*c->lc_func)(v, av);
 186                 else
 187                         if (a->a_flags & A_INUSE)
 188                                 p_error("%s: Recursive alias.", a->a_name);
 189                         else {
 190                                 a->a_flags |= A_INUSE;
 191                                 if (dolongcmd(a->a_buf, av, i) < 0)
 192                                         p_memerror();
 193                                 a->a_flags &= ~A_INUSE;
 194                         }
 195         if (p_abort()) {
 196                 val_free(*v);
 197                 v->v_type = V_ERR;
 198                 goto abort;
 199         }
 200         for (vp = av; vp < &av[LCMD_NARG]; vp++)
 201                 val_free(*vp);
 202         return 0;
 203 abort:
 204         for (vp = av; vp < &av[LCMD_NARG]; vp++)
 205                 val_free(*vp);
 206         return -1;
 207 }
 208
 209 p_assign(name, v, flag)
 210 char *name;
 211 struct value *v;
 212 char flag;
 213 {
 214         (void) s_gettok();
 215
 216         if (p_expr(v, flag) < 0) {
 217                 p_synerror();
 218                 return -1;
 219         }
 220         switch (v->v_type) {
 221         case V_STR:
 222         case V_NUM:
 223                 if (flag && var_set(name, v) == 0) {
 224                         p_memerror();
 225                         val_free(*v);
 226                         return -1;
 227                 }
 228                 break;
 229         }
 230         return 0;
 231 }