usr.bin/tip/value.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)value.c  8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/tip/tip/value.c,v 1.5.2.1 2000/07/01 12:24:23 ps Exp $
  31  */
  32
  33 #include "tip.h"
  34
  35 #define MIDDLE  35
  36
  37 static value_t *vlookup(char *);
  38 int vstring(char *, char *);
  39 void vlex(char *);
  40 void vassign(value_t *, char *);
  41
  42 static int col = 0;
  43
  44 /*
  45  * Variable manipulation
  46  */
  47 void
  48 vinit(void)
  49 {
  50         value_t *p;
  51         char *cp;
  52         FILE *f;
  53         char file[256];
  54
  55         for (p = vtable; p->v_name != NULL; p++) {
  56                 if (p->v_type&ENVIRON)
  57                         if ((cp = getenv(p->v_name)))
  58                                 p->v_value = cp;
  59                 if (p->v_type&IREMOTE) {
  60                         if (p->v_type&STRING)
  61                                 p->v_value = *(char **) address(p->v_value);
  62                         else
  63                                 number(p->v_value) = *address(p->v_value);
  64                 }
  65         }
  66         /*
  67          * Read the .tiprc file in the HOME directory
  68          *  for sets
  69          */
  70         strcpy(file, value(HOME));
  71         strcat(file, "/.tiprc");
  72         if ((f = fopen(file, "r")) != NULL) {
  73                 char *tp;
  74
  75                 while (fgets(file, sizeof(file)-1, f) != NULL) {
  76                         if (vflag)
  77                                 printf("set %s", file);
  78                         if ((tp = rindex(file, '\n')))
  79                                 *tp = '\0';
  80                         vlex(file);
  81                 }
  82                 fclose(f);
  83         }
  84         /*
  85          * To allow definition of exception prior to fork
  86          */
  87         vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
  88 }
  89
  90 static int vaccess(unsigned, unsigned);
  91
  92 /*VARARGS1*/
  93 void
  94 vassign(value_t *p, char *v)
  95 {
  96
  97         if (!vaccess(p->v_access, WRITE)) {
  98                 printf("access denied\r\n");
  99                 return;
 100         }
 101         switch (p->v_type&TMASK) {
 102
 103         case STRING:
 104                 if (p->v_value && equal(p->v_value, v))
 105                         return;
 106                 if (!(p->v_type&(ENVIRON|INIT)))
 107                         free(p->v_value);
 108                 if ((p->v_value = malloc(size(v)+1)) == NULL) {
 109                         printf("out of core\r\n");
 110                         return;
 111                 }
 112                 p->v_type &= ~(ENVIRON|INIT);
 113                 strcpy(p->v_value, v);
 114                 break;
 115
 116         case NUMBER:
 117                 if (number(p->v_value) == number(v))
 118                         return;
 119                 number(p->v_value) = number(v);
 120                 break;
 121
 122         case BOOL:
 123                 if (boolean(p->v_value) == (*v != '!'))
 124                         return;
 125                 boolean(p->v_value) = (*v != '!');
 126                 break;
 127
 128         case CHAR:
 129                 if (character(p->v_value) == *v)
 130                         return;
 131                 character(p->v_value) = *v;
 132         }
 133         p->v_access |= CHANGED;
 134 }
 135
 136 static void vprint(value_t *);
 137 static void vtoken(char *);
 138
 139 void
 140 vlex(char *s)
 141 {
 142         value_t *p;
 143
 144         if (equal(s, "all")) {
 145                 for (p = vtable; p->v_name; p++)
 146                         if (vaccess(p->v_access, READ))
 147                                 vprint(p);
 148         } else {
 149                 char *cp;
 150
 151                 do {
 152                         if ((cp = vinterp(s, ' ')))
 153                                 cp++;
 154                         vtoken(s);
 155                         s = cp;
 156                 } while (s);
 157         }
 158         if (col > 0) {
 159                 printf("\r\n");
 160                 col = 0;
 161         }
 162 }
 163
 164 static void
 165 vtoken(char *s)
 166 {
 167         value_t *p;
 168         char *cp;
 169
 170         if ((cp = index(s, '='))) {
 171                 *cp = '\0';
 172                 if ((p = vlookup(s))) {
 173                         cp++;
 174                         if (p->v_type&NUMBER)
 175                                 vassign(p, (char *)(intptr_t)atoi(cp));
 176                         else {
 177                                 if (strcmp(s, "record") == 0)
 178                                         cp = expand(cp);
 179                                 vassign(p, cp);
 180                         }
 181                         return;
 182                 }
 183         } else if ((cp = index(s, '?'))) {
 184                 *cp = '\0';
 185                 if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
 186                         vprint(p);
 187                         return;
 188                 }
 189         } else {
 190                 if (*s != '!')
 191                         p = vlookup(s);
 192                 else
 193                         p = vlookup(s+1);
 194                 if (p != NULL) {
 195                         vassign(p, s);
 196                         return;
 197                 }
 198         }
 199         printf("%s: unknown variable\r\n", s);
 200 }
 201
 202 static void
 203 vprint(value_t *p)
 204 {
 205         char *cp;
 206
 207         if (col > 0 && col < MIDDLE)
 208                 while (col++ < MIDDLE)
 209                         putchar(' ');
 210         col += size(p->v_name);
 211         switch (p->v_type&TMASK) {
 212
 213         case BOOL:
 214                 if (boolean(p->v_value) == FALSE) {
 215                         col++;
 216                         putchar('!');
 217                 }
 218                 printf("%s", p->v_name);
 219                 break;
 220
 221         case STRING:
 222                 printf("%s=", p->v_name);
 223                 col++;
 224                 if (p->v_value) {
 225                         cp = interp(p->v_value);
 226                         col += size(cp);
 227                         printf("%s", cp);
 228                 }
 229                 break;
 230
 231         case NUMBER:
 232                 col += 6;
 233                 printf("%s=%-5d", p->v_name, number(p->v_value));
 234                 break;
 235
 236         case CHAR:
 237                 printf("%s=", p->v_name);
 238                 col++;
 239                 if (p->v_value) {
 240                         cp = ctrl(character(p->v_value));
 241                         col += size(cp);
 242                         printf("%s", cp);
 243                 }
 244                 break;
 245         }
 246         if (col >= MIDDLE) {
 247                 col = 0;
 248                 printf("\r\n");
 249                 return;
 250         }
 251 }
 252
 253
 254 static int
 255 vaccess(unsigned mode, unsigned rw)
 256 {
 257         if (mode & (rw<<PUBLIC))
 258                 return (1);
 259         if (mode & (rw<<PRIVATE))
 260                 return (1);
 261         return ((mode & (rw<<ROOT)) && getuid() == 0);
 262 }
 263
 264 static value_t *
 265 vlookup(char *s)
 266 {
 267         value_t *p;
 268
 269         for (p = vtable; p->v_name; p++)
 270                 if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
 271                         return (p);
 272         return (NULL);
 273 }
 274
 275 char *
 276 vinterp(char *s, char stop)
 277 {
 278         char *p = s, c;
 279         int num;
 280
 281         while ((c = *s++) && c != stop)
 282                 switch (c) {
 283
 284                 case '^':
 285                         if (*s)
 286                                 *p++ = *s++ - 0100;
 287                         else
 288                                 *p++ = c;
 289                         break;
 290
 291                 case '\\':
 292                         num = 0;
 293                         c = *s++;
 294                         if (c >= '0' && c <= '7')
 295                                 num = (num<<3)+(c-'0');
 296                         else {
 297                                 char *q = "n\nr\rt\tb\bf\f";
 298
 299                                 for (; *q; q++)
 300                                         if (c == *q++) {
 301                                                 *p++ = *q;
 302                                                 goto cont;
 303                                         }
 304                                 *p++ = c;
 305                         cont:
 306                                 break;
 307                         }
 308                         if ((c = *s++) >= '0' && c <= '7') {
 309                                 num = (num<<3)+(c-'0');
 310                                 if ((c = *s++) >= '0' && c <= '7')
 311                                         num = (num<<3)+(c-'0');
 312                                 else
 313                                         s--;
 314                         } else
 315                                 s--;
 316                         *p++ = num;
 317                         break;
 318
 319                 default:
 320                         *p++ = c;
 321                 }
 322         *p = '\0';
 323         return (c == stop ? s-1 : NULL);
 324 }
 325
 326 /*
 327  * assign variable s with value v (for NUMBER or STRING or CHAR types)
 328  */
 329
 330 int
 331 vstring(char *s, char *v)
 332 {
 333         value_t *p;
 334
 335         p = vlookup(s);
 336         if (p == NULL)
 337                 return (1);
 338         if (p->v_type&NUMBER)
 339                 vassign(p, (char *)(intptr_t)atoi(v));
 340         else {
 341                 if (strcmp(s, "record") == 0)
 342                         v = expand(v);
 343                 vassign(p, v);
 344         }
 345         return (0);
 346 }