reg.c

   1 /* registers and environments */
   2 #include <ctype.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <time.h>
   8 #include <unistd.h>
   9 #include "roff.h"
  10
  11 #define NENVS           64      /* number of environment registers */
  12
  13 struct env {
  14         int eregs[NENVS];       /* environment-specific number registers */
  15         int tabs[NTABS];        /* tab stops */
  16         char tabs_type[NTABS];  /* type of tabs: L, C, R */
  17         struct fmt *fmt;        /* per environment line formatting buffer */
  18         struct wb wb;           /* per environment partial word */
  19         char tc[GNLEN];         /* tab character (.tc) */
  20         char lc[GNLEN];         /* leader character (.lc) */
  21         char hc[GNLEN];         /* hyphenation character (.hc) */
  22         char mc[GNLEN];         /* margin character (.mc) */
  23 };
  24
  25 static int nregs[NREGS];        /* global number registers */
  26 static int nregs_inc[NREGS];    /* number register auto-increment size */
  27 static int nregs_fmt[NREGS];    /* number register format */
  28 static char *sregs[NREGS];      /* global string registers */
  29 static void *sregs_dat[NREGS];  /* builtin function data */
  30 static struct env *envs[NREGS];/* environments */
  31 static struct env *env;         /* current enviroment */
  32 static int env_id;              /* current environment id */
  33 static int eregs_idx[NREGS];    /* register environment index in eregs[] */
  34
  35 static char *eregs[] = {        /* environment-specific number registers */
  36         "ln", ".f", ".i", ".j", ".l",
  37         ".L", ".nI", ".nm", ".nM", ".nn",
  38         ".nS", ".m", ".s", ".u", ".v",
  39         ".it", ".itn", ".mc", ".mcn",
  40         ".ce", ".f0", ".i0", ".l0",
  41         ".hy", ".hycost", ".hycost2", ".hycost3", ".hlm",
  42         ".L0", ".m0", ".n0", ".s0", ".ss", ".ssh", ".sss", ".pmll", ".pmllcost",
  43         ".ti", ".lt", ".lt0", ".v0",
  44 };
  45
  46 /* return the address of a number register */
  47 int *nreg(int id)
  48 {
  49         if (eregs_idx[id])
  50                 return &env->eregs[eregs_idx[id]];
  51         return &nregs[id];
  52 }
  53
  54 static char *directory(char *path)
  55 {
  56         static char dst[PATHLEN];
  57         char *s = strrchr(path, '/');
  58         if (!s)
  59                 return ".";
  60         if (path == s)
  61                 return "/";
  62         memcpy(dst, path, s - path);
  63         dst[s - path] = '\0';
  64         return dst;
  65 }
  66
  67 static char *num_tabs(void)
  68 {
  69         static char tabs[16 * NTABS];
  70         int i;
  71         char *s = tabs;
  72         for (i = 0; i < NTABS && env->tabs_type[i]; i++)
  73                 s += sprintf(s, "%du%c ", env->tabs[i], env->tabs_type[i]);
  74         return tabs;
  75 }
  76
  77 static int num_fmt(char *s, int n, int fmt);
  78
  79 /* the contents of a number register (returns a static buffer) */
  80 char *num_str(int id)
  81 {
  82         static char numbuf[128];
  83         char *s = map_name(id);
  84         if (!nregs_fmt[id])
  85                 nregs_fmt[id] = '0';
  86         numbuf[0] = '\0';
  87         if (s[0] == '.' && !s[2]) {
  88                 switch (s[1]) {
  89                 case 'b':
  90                         sprintf(numbuf, "%d", font_getbd(dev_font(n_f)));
  91                         return numbuf;
  92                 case 'c':
  93                         sprintf(numbuf, "%d", in_lnum());
  94                         return numbuf;
  95                 case 'k':
  96                         sprintf(numbuf, "%d", f_hpos());
  97                         return numbuf;
  98                 case 'm':
  99                         sprintf(numbuf, "#%02x%02x%02x",
 100                                 CLR_R(n_m), CLR_G(n_m), CLR_B(n_m));
 101                         return numbuf;
 102                 case 't':
 103                         sprintf(numbuf, "%d", f_nexttrap());
 104                         return numbuf;
 105                 case 'z':
 106                         if (f_divreg() >= 0)
 107                                 sprintf(numbuf, "%s", map_name(f_divreg()));
 108                         return numbuf;
 109                 case 'F':
 110                         sprintf(numbuf, "%s", in_filename());
 111                         return numbuf;
 112                 case 'D':
 113                         sprintf(numbuf, "%s", directory(in_filename()));
 114                         return numbuf;
 115                 case '$':
 116                         sprintf(numbuf, "%d", in_nargs());
 117                         return numbuf;
 118                 }
 119         }
 120         if (s[0] == '.' && !strcmp(".neat", s))
 121                 return "1";
 122         if (s[0] == '.' && s[1] == 'e' && s[2] == 'v' && !s[3])
 123                 return map_name(env_id);
 124         if (s[0] == '$' && s[1] == '$' && !s[2]) {
 125                 sprintf(numbuf, "%d", getpid());
 126                 return numbuf;
 127         }
 128         if (s[0] == 'y' && s[1] == 'r' && !s[2]) {
 129                 sprintf(numbuf, "%02d", *nreg(id));
 130                 return numbuf;
 131         }
 132         if (s[0] == '.' && !strcmp(".tabs", s))
 133                 return num_tabs();
 134         if (!nregs_fmt[id] || num_fmt(numbuf, *nreg(id), nregs_fmt[id]))
 135                 sprintf(numbuf, "%d", *nreg(id));
 136         return numbuf;
 137 }
 138
 139 void num_set(int id, int val)
 140 {
 141         if (!nregs_fmt[id])
 142                 nregs_fmt[id] = '0';
 143         *nreg(id) = val;
 144 }
 145
 146 void num_setinc(int id, int val)
 147 {
 148         nregs_inc[id] = val;
 149 }
 150
 151 void num_inc(int id, int pos)
 152 {
 153         *nreg(id) += pos > 0 ? nregs_inc[id] : -nregs_inc[id];
 154 }
 155
 156 void num_del(int id)
 157 {
 158         *nreg(id) = 0;
 159         nregs_inc[id] = 0;
 160         nregs_fmt[id] = 0;
 161 }
 162
 163 void str_set(int id, char *s)
 164 {
 165         int len = strlen(s) + 1;
 166         if (sregs[id])
 167                 free(sregs[id]);
 168         sregs[id] = xmalloc(len);
 169         memcpy(sregs[id], s, len);
 170         sregs_dat[id] = NULL;
 171 }
 172
 173 char *str_get(int id)
 174 {
 175         return sregs[id];
 176 }
 177
 178 void *str_dget(int id)
 179 {
 180         return sregs_dat[id];
 181 }
 182
 183 void str_dset(int id, void *d)
 184 {
 185         sregs_dat[id] = d;
 186 }
 187
 188 void str_rm(int id)
 189 {
 190         if (sregs[id])
 191                 free(sregs[id]);
 192         sregs[id] = NULL;
 193         sregs_dat[id] = NULL;
 194 }
 195
 196 void str_rn(int src, int dst)
 197 {
 198         if (!sregs[src] && !sregs_dat[src])
 199                 return;
 200         str_rm(dst);
 201         sregs[dst] = sregs[src];
 202         sregs_dat[dst] = sregs_dat[src];
 203         sregs[src] = NULL;
 204         sregs_dat[src] = NULL;
 205 }
 206
 207 static struct env *env_alloc(void)
 208 {
 209         struct env *env = xmalloc(sizeof(*env));
 210         memset(env, 0, sizeof(*env));
 211         wb_init(&env->wb);
 212         env->fmt = fmt_alloc();
 213         return env;
 214 }
 215
 216 static void env_free(struct env *env)
 217 {
 218         fmt_free(env->fmt);
 219         wb_done(&env->wb);
 220         free(env);
 221 }
 222
 223 static void env_set(int id)
 224 {
 225         int i;
 226         env = envs[id];
 227         env_id = id;
 228         if (!env) {
 229                 envs[id] = env_alloc();
 230                 env = envs[id];
 231                 n_f = 1;
 232                 n_i = 0;
 233                 n_j = AD_B;
 234                 n_l = SC_IN * 65 / 10;
 235                 n_L = 1;
 236                 n_s = 10;
 237                 n_u = 1;
 238                 n_v = 12 * SC_PT;
 239                 n_s0 = n_s;
 240                 n_f0 = n_f;
 241                 n_na = 0;
 242                 n_lt = SC_IN * 65 / 10;
 243                 n_hy = 1;
 244                 n_ss = 12;
 245                 n_sss = 12;
 246                 n_nM = 1;
 247                 n_nS = 1;
 248                 strcpy(env->hc, "\\%");
 249                 strcpy(env->lc, ".");
 250                 for (i = 0; i < NTABS; i++) {
 251                         env->tabs[i] = i * SC_IN / 2;
 252                         env->tabs_type[i] = 'L';
 253                 }
 254         }
 255 }
 256
 257 static void init_time(void)
 258 {
 259         time_t t = time(NULL);
 260         struct tm *tm = localtime(&t);
 261         num_set(map("dw"), tm->tm_wday + 1);
 262         num_set(map("dy"), tm->tm_mday);
 263         num_set(map("mo"), tm->tm_mon + 1);
 264         num_set(map("yr"), tm->tm_year % 100);
 265 }
 266
 267 static void init_globals(void)
 268 {
 269         n_o = SC_IN;
 270         n_p = SC_IN * 11;
 271         n_lg = 1;
 272         n_kn = 1;
 273         num_set(map(".H"), 1);
 274         num_set(map(".V"), 1);
 275 }
 276
 277 void env_init(void)
 278 {
 279         int i;
 280         init_time();
 281         init_globals();
 282         for (i = 0; i < LEN(eregs); i++)
 283                 eregs_idx[map(eregs[i])] = i + 1;
 284         env_set(map("0"));
 285 }
 286
 287 void env_done(void)
 288 {
 289         int i;
 290         for (i = 0; i < LEN(envs); i++)
 291                 if (envs[i])
 292                         env_free(envs[i]);
 293         for (i = 0; i < LEN(sregs); i++)
 294                 free(sregs[i]);
 295 }
 296
 297 static int oenv[NPREV];         /* environment stack */
 298 static int nenv;
 299
 300 void tr_ev(char **args)
 301 {
 302         int id = -1;
 303         if (args[1])
 304                 id = map(args[1]);
 305         else
 306                 id = nenv ? oenv[--nenv] : -1;
 307         if (id < 0)
 308                 return;
 309         if (args[1] && env && nenv < NPREV)
 310                 oenv[nenv++] = env_id;
 311         env_set(id);
 312 }
 313
 314 struct fmt *env_fmt(void)
 315 {
 316         return env->fmt;
 317 }
 318
 319 struct wb *env_wb(void)
 320 {
 321         return &env->wb;
 322 }
 323
 324 char *env_hc(void)
 325 {
 326         return env->hc;
 327 }
 328
 329 char *env_mc(void)
 330 {
 331         return env->mc;
 332 }
 333
 334 char *env_tc(void)
 335 {
 336         return env->tc;
 337 }
 338
 339 char *env_lc(void)
 340 {
 341         return env->lc;
 342 }
 343
 344 /* saving and restoring registers around diverted lines */
 345 struct odiv {
 346         int f, s, m, f0, s0, m0;
 347 };
 348
 349 static struct odiv odivs[NPREV];        /* state before diverted text */
 350 static int nodivs;
 351
 352 /* begin outputting diverted line */
 353 void odiv_beg(void)
 354 {
 355         struct odiv *o = &odivs[nodivs++];
 356         o->f = n_f;
 357         o->s = n_s;
 358         o->m = n_m;
 359         o->f0 = n_f0;
 360         o->s0 = n_s0;
 361         o->m0 = n_m0;
 362 }
 363
 364 /* end outputting diverted line */
 365 void odiv_end(void)
 366 {
 367         struct odiv *o = &odivs[--nodivs];
 368         n_f = o->f;
 369         n_s = o->s;
 370         n_m = o->m;
 371         n_f0 = o->f0;
 372         n_s0 = o->s0;
 373         n_m0 = o->m0;
 374 }
 375
 376 void tr_ta(char **args)
 377 {
 378         int i;
 379         int c;
 380         for (i = 0; i < NTABS; i++) {
 381                 if (i + 1 < NARGS && args[i + 1]) {
 382                         char *a = args[i + 1];
 383                         env->tabs[i] = eval_re(a, i > 0 ? env->tabs[i - 1] : 0, 'm');
 384                         c = a[0] ? (unsigned char) strchr(a, '\0')[-1] : 0;
 385                         env->tabs_type[i] = strchr("LRC", c) ? c : 'L';
 386                 } else {
 387                         env->tabs[i] = 0;
 388                         env->tabs_type[i] = 0;
 389                 }
 390         }
 391 }
 392
 393 static int tab_idx(int pos)
 394 {
 395         int i;
 396         for (i = 0; i < LEN(env->tabs); i++)
 397                 if (env->tabs[i] > pos)
 398                         return i;
 399         return -1;
 400 }
 401
 402 int tab_next(int pos)
 403 {
 404         int i = tab_idx(pos);
 405         return i >= 0 ? env->tabs[i] : pos;
 406 }
 407
 408 int tab_type(int pos)
 409 {
 410         int i = tab_idx(pos);
 411         return i >= 0 && env->tabs_type[i] ? env->tabs_type[i] : 'L';
 412 }
 413
 414 /* number register format (.af) */
 415 #define NF_LSH          8               /* number format length shifts */
 416 #define NF_FMT          0x00ff          /* number format mask */
 417
 418 /* the format of a number register (returns a static buffer) */
 419 char *num_getfmt(int id)
 420 {
 421         static char fmtbuf[128];
 422         char *s = fmtbuf;
 423         int fmt = nregs_fmt[id] & NF_FMT;
 424         int i;
 425         if (fmt == '0' || fmt == 'x' || fmt == 'X') {
 426                 i = nregs_fmt[id] >> NF_LSH;
 427                 while (i-- > 1)
 428                         *s++ = '0';
 429                 *s++ = fmt;
 430         } else if (nregs_fmt[id]) {
 431                 *s++ = fmt;
 432         }
 433         *s = '\0';
 434         return fmtbuf;
 435 }
 436
 437 void num_setfmt(int id, char *s)
 438 {
 439         int i = 0;
 440         if (strchr("iIaA", s[0])) {
 441                 nregs_fmt[id] = s[0];
 442         } else {
 443                 while (isdigit((unsigned char) s[i]))
 444                         i++;
 445                 if (s[i] == 'x' || s[i] == 'X')
 446                         nregs_fmt[id] = s[i] | ((i + 1) << NF_LSH);
 447                 else
 448                         nregs_fmt[id] = '0' | (i << NF_LSH);
 449         }
 450 }
 451
 452 static void nf_reverse(char *s)
 453 {
 454         char r[128];
 455         int i, l;
 456         strcpy(r, s);
 457         l = strlen(r);
 458         for (i = 0; i < l; i++)
 459                 s[i] = r[l - i - 1];
 460 }
 461
 462 static void nf_roman(char *s, int n, char *I, char *V)
 463 {
 464         int i;
 465         if (!n)
 466                 return;
 467         if (n % 5 == 4) {
 468                 *s++ = n % 10 == 9 ? I[1] : V[0];
 469                 *s++ = I[0];
 470         } else {
 471                 for (i = 0; i < n % 5; i++)
 472                         *s++ = I[0];
 473                 if (n % 10 >= 5)
 474                         *s++ = V[0];
 475         }
 476         *s = '\0';
 477         nf_roman(s, n / 10, I + 1, V + 1);
 478 }
 479
 480 static void nf_alpha(char *s, int n, int a)
 481 {
 482         while (n) {
 483                 *s++ = a + ((n - 1) % 26);
 484                 n /= 26;
 485         }
 486         *s = '\0';
 487 }
 488
 489 /* returns nonzero on failure */
 490 static int num_fmt(char *s, int n, int fmt)
 491 {
 492         int type = fmt & NF_FMT;
 493         if (n < 0) {
 494                 n = -n;
 495                 *s++ = '-';
 496         }
 497         if ((type == 'i' || type == 'I') && n > 0 && n < 40000) {
 498                 if (type == 'i')
 499                         nf_roman(s, n, "ixcmz", "vldw");
 500                 else
 501                         nf_roman(s, n, "IXCMZ", "VLDW");
 502                 nf_reverse(s);
 503                 return 0;
 504         }
 505         if ((type == 'a' || type == 'A') && n > 0) {
 506                 nf_alpha(s, n, type);
 507                 nf_reverse(s);
 508                 return 0;
 509         }
 510         if (type == '0' || type == 'x' || type == 'X') {
 511                 char pat[16];
 512                 sprintf(pat, "%%0%d%c", fmt >> NF_LSH, type == '0' ? 'd' : type);
 513                 sprintf(s, pat, n);
 514                 return 0;
 515         }
 516         return 1;
 517 }