usr.bin/tip/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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)value.c  8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/tip/tip/value.c,v 1.5.2.1 2000/07/01 12:24:23 ps Exp $
  35  * $DragonFly: src/usr.bin/tip/tip/value.c,v 1.5 2005/05/07 23:20:43 corecode Exp $
  36  */
  37
  38 #include "tip.h"
  39
  40 #define MIDDLE  35
  41
  42 static value_t *vlookup();
  43 int vstring(char *, char *);
  44 void vlex(char *);
  45 void vassign(value_t *, char *);
  46
  47 static int col = 0;
  48
  49 /*
  50  * Variable manipulation
  51  */
  52 void
  53 vinit()
  54 {
  55         register value_t *p;
  56         register char *cp;
  57         FILE *f;
  58         char file[256];
  59
  60         for (p = vtable; p->v_name != NULL; p++) {
  61                 if (p->v_type&ENVIRON)
  62                         if ((cp = getenv(p->v_name)))
  63                                 p->v_value = cp;
  64                 if (p->v_type&IREMOTE)
  65                         if (p->v_type&STRING)
  66                                 p->v_value = *(char **) address(p->v_value);
  67                         else
  68                                 number(p->v_value) = *address(p->v_value);
  69         }
  70         /*
  71          * Read the .tiprc file in the HOME directory
  72          *  for sets
  73          */
  74         strcpy(file, value(HOME));
  75         strcat(file, "/.tiprc");
  76         if ((f = fopen(file, "r")) != NULL) {
  77                 register char *tp;
  78
  79                 while (fgets(file, sizeof(file)-1, f) != NULL) {
  80                         if (vflag)
  81                                 printf("set %s", file);
  82                         if ((tp = rindex(file, '\n')))
  83                                 *tp = '\0';
  84                         vlex(file);
  85                 }
  86                 fclose(f);
  87         }
  88         /*
  89          * To allow definition of exception prior to fork
  90          */
  91         vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
  92 }
  93
  94 static int vaccess();
  95
  96 /*VARARGS1*/
  97 void
  98 vassign(p, v)
  99         register value_t *p;
 100         char *v;
 101 {
 102
 103         if (!vaccess(p->v_access, WRITE)) {
 104                 printf("access denied\r\n");
 105                 return;
 106         }
 107         switch (p->v_type&TMASK) {
 108
 109         case STRING:
 110                 if (p->v_value && equal(p->v_value, v))
 111                         return;
 112                 if (!(p->v_type&(ENVIRON|INIT)))
 113                         free(p->v_value);
 114                 if ((p->v_value = malloc(size(v)+1)) == NULL) {
 115                         printf("out of core\r\n");
 116                         return;
 117                 }
 118                 p->v_type &= ~(ENVIRON|INIT);
 119                 strcpy(p->v_value, v);
 120                 break;
 121
 122         case NUMBER:
 123                 if (number(p->v_value) == number(v))
 124                         return;
 125                 number(p->v_value) = number(v);
 126                 break;
 127
 128         case BOOL:
 129                 if (boolean(p->v_value) == (*v != '!'))
 130                         return;
 131                 boolean(p->v_value) = (*v != '!');
 132                 break;
 133
 134         case CHAR:
 135                 if (character(p->v_value) == *v)
 136                         return;
 137                 character(p->v_value) = *v;
 138         }
 139         p->v_access |= CHANGED;
 140 }
 141
 142 static void vprint();
 143 static void vtoken(char *);
 144
 145 void
 146 vlex(s)
 147         register char *s;
 148 {
 149         register value_t *p;
 150
 151         if (equal(s, "all")) {
 152                 for (p = vtable; p->v_name; p++)
 153                         if (vaccess(p->v_access, READ))
 154                                 vprint(p);
 155         } else {
 156                 register char *cp;
 157
 158                 do {
 159                         if ((cp = vinterp(s, ' ')))
 160                                 cp++;
 161                         vtoken(s);
 162                         s = cp;
 163                 } while (s);
 164         }
 165         if (col > 0) {
 166                 printf("\r\n");
 167                 col = 0;
 168         }
 169 }
 170
 171 static void
 172 vtoken(s)
 173         register char *s;
 174 {
 175         register value_t *p;
 176         register char *cp;
 177         char *expand();
 178
 179         if ((cp = index(s, '='))) {
 180                 *cp = '\0';
 181                 if ((p = vlookup(s))) {
 182                         cp++;
 183                         if (p->v_type&NUMBER)
 184                                 vassign(p, (char *)(intptr_t)atoi(cp));
 185                         else {
 186                                 if (strcmp(s, "record") == 0)
 187                                         cp = expand(cp);
 188                                 vassign(p, cp);
 189                         }
 190                         return;
 191                 }
 192         } else if ((cp = index(s, '?'))) {
 193                 *cp = '\0';
 194                 if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
 195                         vprint(p);
 196                         return;
 197                 }
 198         } else {
 199                 if (*s != '!')
 200                         p = vlookup(s);
 201                 else
 202                         p = vlookup(s+1);
 203                 if (p != NULL) {
 204                         vassign(p, s);
 205                         return;
 206                 }
 207         }
 208         printf("%s: unknown variable\r\n", s);
 209 }
 210
 211 static void
 212 vprint(p)
 213         register value_t *p;
 214 {
 215         register char *cp;
 216         extern char *interp(), *ctrl();
 217
 218         if (col > 0 && col < MIDDLE)
 219                 while (col++ < MIDDLE)
 220                         putchar(' ');
 221         col += size(p->v_name);
 222         switch (p->v_type&TMASK) {
 223
 224         case BOOL:
 225                 if (boolean(p->v_value) == FALSE) {
 226                         col++;
 227                         putchar('!');
 228                 }
 229                 printf("%s", p->v_name);
 230                 break;
 231
 232         case STRING:
 233                 printf("%s=", p->v_name);
 234                 col++;
 235                 if (p->v_value) {
 236                         cp = interp(p->v_value, NULL);
 237                         col += size(cp);
 238                         printf("%s", cp);
 239                 }
 240                 break;
 241
 242         case NUMBER:
 243                 col += 6;
 244                 printf("%s=%-5d", p->v_name, number(p->v_value));
 245                 break;
 246
 247         case CHAR:
 248                 printf("%s=", p->v_name);
 249                 col++;
 250                 if (p->v_value) {
 251                         cp = ctrl(character(p->v_value));
 252                         col += size(cp);
 253                         printf("%s", cp);
 254                 }
 255                 break;
 256         }
 257         if (col >= MIDDLE) {
 258                 col = 0;
 259                 printf("\r\n");
 260                 return;
 261         }
 262 }
 263
 264
 265 static int
 266 vaccess(mode, rw)
 267         register unsigned mode, rw;
 268 {
 269         if (mode & (rw<<PUBLIC))
 270                 return (1);
 271         if (mode & (rw<<PRIVATE))
 272                 return (1);
 273         return ((mode & (rw<<ROOT)) && getuid() == 0);
 274 }
 275
 276 static value_t *
 277 vlookup(s)
 278         register char *s;
 279 {
 280         register value_t *p;
 281
 282         for (p = vtable; p->v_name; p++)
 283                 if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
 284                         return (p);
 285         return (NULL);
 286 }
 287
 288 char *
 289 vinterp(s, stop)
 290         register char *s;
 291         char stop;
 292 {
 293         register char *p = s, c;
 294         int num;
 295
 296         while ((c = *s++) && c != stop)
 297                 switch (c) {
 298
 299                 case '^':
 300                         if (*s)
 301                                 *p++ = *s++ - 0100;
 302                         else
 303                                 *p++ = c;
 304                         break;
 305
 306                 case '\\':
 307                         num = 0;
 308                         c = *s++;
 309                         if (c >= '0' && c <= '7')
 310                                 num = (num<<3)+(c-'0');
 311                         else {
 312                                 register char *q = "n\nr\rt\tb\bf\f";
 313
 314                                 for (; *q; q++)
 315                                         if (c == *q++) {
 316                                                 *p++ = *q;
 317                                                 goto cont;
 318                                         }
 319                                 *p++ = c;
 320                         cont:
 321                                 break;
 322                         }
 323                         if ((c = *s++) >= '0' && c <= '7') {
 324                                 num = (num<<3)+(c-'0');
 325                                 if ((c = *s++) >= '0' && c <= '7')
 326                                         num = (num<<3)+(c-'0');
 327                                 else
 328                                         s--;
 329                         } else
 330                                 s--;
 331                         *p++ = num;
 332                         break;
 333
 334                 default:
 335                         *p++ = c;
 336                 }
 337         *p = '\0';
 338         return (c == stop ? s-1 : NULL);
 339 }
 340
 341 /*
 342  * assign variable s with value v (for NUMBER or STRING or CHAR types)
 343  */
 344
 345 int
 346 vstring(s,v)
 347         register char *s;
 348         register char *v;
 349 {
 350         register value_t *p;
 351         char *expand();
 352
 353         p = vlookup(s);
 354         if (p == 0)
 355                 return (1);
 356         if (p->v_type&NUMBER)
 357                 vassign(p, (char *)(intptr_t)atoi(v));
 358         else {
 359                 if (strcmp(s, "record") == 0)
 360                         v = expand(v);
 361                 vassign(p, v);
 362         }
 363         return (0);
 364 }