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 } 347