usr.bin/window/parser2.c

   1 /*      @(#)parser2.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: parser2.c,v 1.11 2009/04/14 08:50:06 lukem Exp $       */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #define EXTERN
  37 #include "ww.h"
  38 #include "defs.h"
  39 #include "alias.h"
  40 #undef  EXTERN
  41 #include "parser.h"
  42 #include "var.h"
  43 #include "lcmd.h"
  44
  45 /*
  46  * name == 0 means we don't have a function name but
  47  * want to parse the arguments anyway.  flag == 0 in this case.
  48  */
  49 int
  50 p_function(const char *name, struct value *v, int flag)
  51 {
  52         struct value t;
  53         struct lcmd_tab *c = NULL;
  54         struct alias *a = NULL;
  55         struct lcmd_arg *ap;                    /* this arg */
  56         struct lcmd_arg *lp = NULL;             /* list arg */
  57         int i;
  58         struct value av[LCMD_NARG + 1];
  59         struct value *vp;
  60
  61         if (name != NULL) {
  62                 if ((c = lcmd_lookup(name)))
  63                         name = c->lc_name;
  64                 else if ((a = alias_lookup(name)))
  65                         name = a->a_name;
  66                 else {
  67                         p_error("%s: No such command or alias.", name);
  68                         flag = 0;
  69                 }
  70         }
  71         for (vp = av; vp < &av[LCMD_NARG + 1]; vp++)
  72                 vp->v_type = V_ERR;
  73
  74         if (token == T_LP)
  75                 (void) s_gettok();
  76         i = 0;
  77         for (;;) {
  78                 ap = NULL;
  79                 vp = NULL;
  80                 if (token == T_COMMA)           /* null argument */
  81                         t.v_type = V_ERR;
  82                 else {
  83                         if (p_expr0(&t, flag) < 0)
  84                                 break;
  85                         if (t.v_type == V_ERR)
  86                                 flag = 0;
  87                 }
  88                 if (token != T_ASSIGN) {
  89                         if (i >= LCMD_NARG ||
  90                             (c != NULL && (ap = lp) == NULL &&
  91                             (ap = c->lc_arg + i)->arg_name == 0)) {
  92                                 p_error("%s: Too many arguments.", name);
  93                                 flag = 0;
  94                         } else
  95                                 vp = &av[i++];
  96                 } else {
  97                         char *tmp;
  98                         if (p_convstr(&t) < 0)
  99                                 goto abort;
 100                         tmp = t.v_type == V_STR ? t.v_str : 0;
 101                         (void) s_gettok();
 102                         if (p_expr(&t, flag) < 0) {
 103                                 if (tmp)
 104                                         str_free(tmp);
 105                                 p_synerror();
 106                                 goto abort;
 107                         }
 108                         if (t.v_type == V_ERR)
 109                                 flag = 0;
 110                         if (tmp) {
 111                                 if (c == NULL) {
 112                                         /* an aliase */
 113                                         p_error("%s: Bad alias syntax.", name);
 114                                         flag = 0;
 115                                 } else {
 116                                         for (ap = c->lc_arg, vp = av;
 117                                              ap != NULL && ap->arg_name != 0 &&
 118                                              (*ap->arg_name == '\0' ||
 119                                               !str_match(tmp, ap->arg_name,
 120                                                         ap->arg_minlen));
 121                                              ap++, vp++)
 122                                                 ;
 123                                         if (ap == NULL || ap->arg_name == 0) {
 124                                                 p_error("%s: Unknown argument \"%s\".",
 125                                                         name, tmp);
 126                                                 flag = 0;
 127                                                 ap = NULL;
 128                                                 vp = NULL;
 129                                         }
 130                                 }
 131                                 str_free(tmp);
 132                         }
 133                 }
 134                 if (ap != NULL) {
 135                         if (ap->arg_flags & ARG_LIST) {
 136                                 i = vp - av + 1;
 137                                 lp = ap;
 138                         }
 139                         if (vp && vp->v_type != V_ERR) {
 140                                 if (*ap->arg_name)
 141                                         p_error("%s: Argument %d (%s) duplicated.",
 142                                                 name, (int)(vp - av + 1),
 143                                                 ap->arg_name);
 144                                 else
 145                                         p_error("%s: Argument %d duplicated.",
 146                                                 name, (int)(vp - av + 1));
 147                                 flag = 0;
 148                                 vp = NULL;
 149                         } else if (t.v_type == V_ERR) {
 150                                 /* do nothing */
 151                         } else if (((ap->arg_flags&ARG_TYPE) == ARG_NUM &&
 152                                     t.v_type != V_NUM) ||
 153                                    ((ap->arg_flags&ARG_TYPE) == ARG_STR &&
 154                                    t.v_type != V_STR)) {
 155                                 if (*ap->arg_name)
 156                                         p_error("%s: Argument %d (%s) type mismatch.",
 157                                                 name, (int)(vp - av + 1),
 158                                                 ap->arg_name);
 159                                 else
 160                                         p_error("%s: Argument %d type mismatch.",
 161                                                 name, (int)(vp - av + 1));
 162                                 flag = 0;
 163                                 vp = NULL;
 164                         }
 165                 }
 166                 if (vp != NULL)
 167                         *vp = t;
 168                 else
 169                         val_free(t);
 170                 if (token == T_COMMA)
 171                         (void) s_gettok();
 172         }
 173
 174         if (p_erred())
 175                 flag = 0;
 176         if (token == T_RP)
 177                 (void) s_gettok();
 178         else if (token != T_EOL && token != T_EOF)
 179                 flag = 0;               /* look for legal follow set */
 180         v->v_type = V_ERR;
 181         if (flag) {
 182                 if (c != NULL)
 183                         (*c->lc_func)(v, av);
 184                 else {
 185                         if (a->a_flags & A_INUSE)
 186                                 p_error("%s: Recursive alias.", a->a_name);
 187                         else {
 188                                 a->a_flags |= A_INUSE;
 189                                 if (dolongcmd(a->a_buf, av, i) < 0)
 190                                         p_memerror();
 191                                 a->a_flags &= ~A_INUSE;
 192                         }
 193                 }
 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 int
 210 p_assign(const char *name, struct value *v, int flag)
 211 {
 212         (void) s_gettok();
 213
 214         if (p_expr(v, flag) < 0) {
 215                 p_synerror();
 216                 return -1;
 217         }
 218         switch (v->v_type) {
 219         case V_STR:
 220         case V_NUM:
 221                 if (name && flag && var_set(name, v) == 0) {
 222                         p_memerror();
 223                         val_free(*v);
 224                         return -1;
 225                 }
 226                 break;
 227         }
 228         return 0;
 229 }