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         ".I", ".I0", ".tI", ".td", ".cd",
  45 };
  46
  47 /* return the address of a number register */
  48 int *nreg(int id)
  49 {
  50         if (eregs_idx[id])
  51                 return &env->eregs[eregs_idx[id]];
  52         return &nregs[id];
  53 }
  54
  55 static char *directory(char *path)
  56 {
  57         static char dst[PATHLEN];
  58         char *s = strrchr(path, '/');
  59         if (!s)
  60                 return ".";
  61         if (path == s)
  62                 return "/";
  63         memcpy(dst, path, s - path);
  64         dst[s - path] = '\0';
  65         return dst;
  66 }
  67
  68 static char *num_tabs(void)
  69 {
  70         static char tabs[16 * NTABS];
  71         int i;
  72         char *s = tabs;
  73         for (i = 0; i < NTABS && env->tabs_type[i]; i++)
  74                 s += sprintf(s, "%du%c ", env->tabs[i], env->tabs_type[i]);
  75         return tabs;
  76 }
  77
  78 static int num_fmt(char *s, int n, int fmt);
  79
  80 /* the contents of a number register (returns a static buffer) */
  81 char *num_str(int id)
  82 {
  83         static char numbuf[128];
  84         char *s = map_name(id);
  85         if (!nregs_fmt[id])
  86                 nregs_fmt[id] = '0';
  87         numbuf[0] = '\0';
  88         if (s[0] == '.' && !s[2]) {
  89                 switch (s[1]) {
  90                 case 'b':
  91                         sprintf(numbuf, "%d", font_getbd(dev_font(n_f)));
  92                         return numbuf;
  93                 case 'c':
  94                         sprintf(numbuf, "%d", in_lnum());
  95                         return numbuf;
  96                 case 'k':
  97                         sprintf(numbuf, "%d", f_hpos());
  98                         return numbuf;
  99                 case 'm':
 100                         sprintf(numbuf, "#%02x%02x%02x",
 101                                 CLR_R(n_m), CLR_G(n_m), CLR_B(n_m));
 102                         return numbuf;
 103                 case 't':
 104                         sprintf(numbuf, "%d", f_nexttrap());
 105                         return numbuf;
 106                 case 'z':
 107                         if (f_divreg() >= 0)
 108                                 sprintf(numbuf, "%s", map_name(f_divreg()));
 109                         return numbuf;
 110                 case 'F':
 111                         sprintf(numbuf, "%s", in_filename());
 112                         return numbuf;
 113                 case 'D':
 114                         sprintf(numbuf, "%s", directory(in_filename()));
 115                         return numbuf;
 116                 case '$':
 117                         sprintf(numbuf, "%d", in_nargs());
 118                         return numbuf;
 119                 }
 120         }
 121         if (s[0] == '.' && !strcmp(".neat", s))
 122                 return "1";
 123         if (s[0] == '.' && s[1] == 'e' && s[2] == 'v' && !s[3])
 124                 return map_name(env_id);
 125         if (s[0] == '$' && s[1] == '$' && !s[2]) {
 126                 sprintf(numbuf, "%d", getpid());
 127                 return numbuf;
 128         }
 129         if (s[0] == 'y' && s[1] == 'r' && !s[2]) {
 130                 sprintf(numbuf, "%02d", *nreg(id));
 131                 return numbuf;
 132         }
 133         if (s[0] == '.' && !strcmp(".tabs", s))
 134                 return num_tabs();
 135         if (!nregs_fmt[id] || num_fmt(numbuf, *nreg(id), nregs_fmt[id]))
 136                 sprintf(numbuf, "%d", *nreg(id));
 137         return numbuf;
 138 }
 139
 140 void num_set(int id, int val)
 141 {
 142         if (!nregs_fmt[id])
 143                 nregs_fmt[id] = '0';
 144         *nreg(id) = val;
 145 }
 146
 147 void num_setinc(int id, int val)
 148 {
 149         nregs_inc[id] = val;
 150 }
 151
 152 void num_inc(int id, int pos)
 153 {
 154         *nreg(id) += pos > 0 ? nregs_inc[id] : -nregs_inc[id];
 155 }
 156
 157 void num_del(int id)
 158 {
 159         *nreg(id) = 0;
 160         nregs_inc[id] = 0;
 161         nregs_fmt[id] = 0;
 162 }
 163
 164 void str_set(int id, char *s)
 165 {
 166         int len = strlen(s) + 1;
 167         if (sregs[id])
 168                 free(sregs[id]);
 169         sregs[id] = xmalloc(len);
 170         memcpy(sregs[id], s, len);
 171         sregs_dat[id] = NULL;
 172 }
 173
 174 char *str_get(int id)
 175 {
 176         return sregs[id];
 177 }
 178
 179 void *str_dget(int id)
 180 {
 181         return sregs_dat[id];
 182 }
 183
 184 void str_dset(int id, void *d)
 185 {
 186         sregs_dat[id] = d;
 187 }
 188
 189 void str_rm(int id)
 190 {
 191         if (sregs[id])
 192                 free(sregs[id]);
 193         sregs[id] = NULL;
 194         sregs_dat[id] = NULL;
 195 }
 196
 197 void str_rn(int src, int dst)
 198 {
 199         if (!sregs[src] && !sregs_dat[src])
 200                 return;
 201         str_rm(dst);
 202         sregs[dst] = sregs[src];
 203         sregs_dat[dst] = sregs_dat[src];
 204         sregs[src] = NULL;
 205         sregs_dat[src] = NULL;
 206 }
 207
 208 static struct env *env_alloc(void)
 209 {
 210         struct env *env = xmalloc(sizeof(*env));
 211         memset(env, 0, sizeof(*env));
 212         wb_init(&env->wb);
 213         env->fmt = fmt_alloc();
 214         return env;
 215 }
 216
 217 static void env_free(struct env *env)
 218 {
 219         fmt_free(env->fmt);
 220         wb_done(&env->wb);
 221         free(env);
 222 }
 223
 224 static void env_set(int id)
 225 {
 226         int i;
 227         env = envs[id];
 228         env_id = id;
 229         if (!env) {
 230                 envs[id] = env_alloc();
 231                 env = envs[id];
 232                 n_f = 1;
 233                 n_i = 0;
 234                 n_I = 0;
 235                 n_j = AD_B;
 236                 n_l = SC_IN * 65 / 10;
 237                 n_L = 1;
 238                 n_s = 10;
 239                 n_u = 1;
 240                 n_v = 12 * SC_PT;
 241                 n_s0 = n_s;
 242                 n_f0 = n_f;
 243                 n_na = 0;
 244                 n_lt = SC_IN * 65 / 10;
 245                 n_hy = 1;
 246                 n_ss = 12;
 247                 n_sss = 12;
 248                 n_nM = 1;
 249                 n_nS = 1;
 250                 strcpy(env->hc, "\\%");
 251                 strcpy(env->lc, ".");
 252                 for (i = 0; i < NTABS; i++) {
 253                         env->tabs[i] = i * SC_IN / 2;
 254                         env->tabs_type[i] = 'L';
 255                 }
 256         }
 257 }
 258
 259 static void init_time(void)
 260 {
 261         time_t t = time(NULL);
 262         struct tm *tm = localtime(&t);
 263         num_set(map("dw"), tm->tm_wday + 1);
 264         num_set(map("dy"), tm->tm_mday);
 265         num_set(map("mo"), tm->tm_mon + 1);
 266         num_set(map("yr"), tm->tm_year % 100);
 267 }
 268
 269 static void init_globals(void)
 270 {
 271         n_o = SC_IN;
 272         n_p = SC_IN * 11;
 273         n_lg = 1;
 274         n_kn = 1;
 275         num_set(map(".H"), 1);
 276         num_set(map(".V"), 1);
 277 }
 278
 279 void env_init(void)
 280 {
 281         int i;
 282         init_time();
 283         init_globals();
 284         for (i = 0; i < LEN(eregs); i++)
 285                 eregs_idx[map(eregs[i])] = i + 1;
 286         env_set(map("0"));
 287 }
 288
 289 void env_done(void)
 290 {
 291         int i;
 292         for (i = 0; i < LEN(envs); i++)
 293                 if (envs[i])
 294                         env_free(envs[i]);
 295         for (i = 0; i < LEN(sregs); i++)
 296                 free(sregs[i]);
 297 }
 298
 299 static int oenv[NPREV];         /* environment stack */
 300 static int nenv;
 301
 302 void tr_ev(char **args)
 303 {
 304         int id = -1;
 305         if (args[1])
 306                 id = map(args[1]);
 307         else
 308                 id = nenv ? oenv[--nenv] : -1;
 309         if (id < 0)
 310                 return;
 311         if (args[1] && env && nenv < NPREV)
 312                 oenv[nenv++] = env_id;
 313         env_set(id);
 314 }
 315
 316 struct fmt *env_fmt(void)
 317 {
 318         return env->fmt;
 319 }
 320
 321 struct wb *env_wb(void)
 322 {
 323         return &env->wb;
 324 }
 325
 326 char *env_hc(void)
 327 {
 328         return env->hc;
 329 }
 330
 331 char *env_mc(void)
 332 {
 333         return env->mc;
 334 }
 335
 336 char *env_tc(void)
 337 {
 338         return env->tc;
 339 }
 340
 341 char *env_lc(void)
 342 {
 343         return env->lc;
 344 }
 345
 346 /* saving and restoring registers around diverted lines */
 347 struct odiv {
 348         int f, s, m, f0, s0, m0, cd;
 349 };
 350
 351 static struct odiv odivs[NPREV];        /* state before diverted text */
 352 static int nodivs;
 353
 354 /* begin outputting diverted line */
 355 void odiv_beg(void)
 356 {
 357         struct odiv *o = &odivs[nodivs++];
 358         o->f = n_f;
 359         o->s = n_s;
 360         o->m = n_m;
 361         o->f0 = n_f0;
 362         o->s0 = n_s0;
 363         o->m0 = n_m0;
 364         o->cd = n_cd;
 365 }
 366
 367 /* end outputting diverted line */
 368 void odiv_end(void)
 369 {
 370         struct odiv *o = &odivs[--nodivs];
 371         n_f = o->f;
 372         n_s = o->s;
 373         n_m = o->m;
 374         n_f0 = o->f0;
 375         n_s0 = o->s0;
 376         n_m0 = o->m0;
 377         n_cd = o->cd;
 378 }
 379
 380 void tr_ta(char **args)
 381 {
 382         int i;
 383         int c;
 384         for (i = 0; i < NTABS; i++) {
 385                 if (i + 1 < NARGS && args[i + 1]) {
 386                         char *a = args[i + 1];
 387                         env->tabs[i] = eval_re(a, i > 0 ? env->tabs[i - 1] : 0, 'm');
 388                         c = a[0] ? (unsigned char) strchr(a, '\0')[-1] : 0;
 389                         env->tabs_type[i] = strchr("LRC", c) ? c : 'L';
 390                 } else {
 391                         env->tabs[i] = 0;
 392                         env->tabs_type[i] = 0;
 393                 }
 394         }
 395 }
 396
 397 static int tab_idx(int pos)
 398 {
 399         int i;
 400         for (i = 0; i < LEN(env->tabs); i++)
 401                 if (env->tabs[i] > pos)
 402                         return i;
 403         return -1;
 404 }
 405
 406 int tab_next(int pos)
 407 {
 408         int i = tab_idx(pos);
 409         return i >= 0 ? env->tabs[i] : pos;
 410 }
 411
 412 int tab_type(int pos)
 413 {
 414         int i = tab_idx(pos);
 415         return i >= 0 && env->tabs_type[i] ? env->tabs_type[i] : 'L';
 416 }
 417
 418 /* number register format (.af) */
 419 #define NF_LSH          8               /* number format length shifts */
 420 #define NF_FMT          0x00ff          /* number format mask */
 421
 422 /* the format of a number register (returns a static buffer) */
 423 char *num_getfmt(int id)
 424 {
 425         static char fmtbuf[128];
 426         char *s = fmtbuf;
 427         int fmt = nregs_fmt[id] & NF_FMT;
 428         int i;
 429         if (fmt == '0' || fmt == 'x' || fmt == 'X') {
 430                 i = nregs_fmt[id] >> NF_LSH;
 431                 while (i-- > 1)
 432                         *s++ = '0';
 433                 *s++ = fmt;
 434         } else if (nregs_fmt[id]) {
 435                 *s++ = fmt;
 436         }
 437         *s = '\0';
 438         return fmtbuf;
 439 }
 440
 441 void num_setfmt(int id, char *s)
 442 {
 443         int i = 0;
 444         if (strchr("iIaA", s[0])) {
 445                 nregs_fmt[id] = s[0];
 446         } else {
 447                 while (isdigit((unsigned char) s[i]))
 448                         i++;
 449                 if (s[i] == 'x' || s[i] == 'X')
 450                         nregs_fmt[id] = s[i] | ((i + 1) << NF_LSH);
 451                 else
 452                         nregs_fmt[id] = '0' | (i << NF_LSH);
 453         }
 454 }
 455
 456 static void nf_reverse(char *s)
 457 {
 458         char r[128];
 459         int i, l;
 460         strcpy(r, s);
 461         l = strlen(r);
 462         for (i = 0; i < l; i++)
 463                 s[i] = r[l - i - 1];
 464 }
 465
 466 static void nf_roman(char *s, int n, char *I, char *V)
 467 {
 468         int i;
 469         if (!n)
 470                 return;
 471         if (n % 5 == 4) {
 472                 *s++ = n % 10 == 9 ? I[1] : V[0];
 473                 *s++ = I[0];
 474         } else {
 475                 for (i = 0; i < n % 5; i++)
 476                         *s++ = I[0];
 477                 if (n % 10 >= 5)
 478                         *s++ = V[0];
 479         }
 480         *s = '\0';
 481         nf_roman(s, n / 10, I + 1, V + 1);
 482 }
 483
 484 static void nf_alpha(char *s, int n, int a)
 485 {
 486         while (n) {
 487                 *s++ = a + ((n - 1) % 26);
 488                 n /= 26;
 489         }
 490         *s = '\0';
 491 }
 492
 493 /* returns nonzero on failure */
 494 static int num_fmt(char *s, int n, int fmt)
 495 {
 496         int type = fmt & NF_FMT;
 497         if (n < 0) {
 498                 n = -n;
 499                 *s++ = '-';
 500         }
 501         if ((type == 'i' || type == 'I') && n > 0 && n < 40000) {
 502                 if (type == 'i')
 503                         nf_roman(s, n, "ixcmz", "vldw");
 504                 else
 505                         nf_roman(s, n, "IXCMZ", "VLDW");
 506                 nf_reverse(s);
 507                 return 0;
 508         }
 509         if ((type == 'a' || type == 'A') && n > 0) {
 510                 nf_alpha(s, n, type);
 511                 nf_reverse(s);
 512                 return 0;
 513         }
 514         if (type == '0' || type == 'x' || type == 'X') {
 515                 char pat[16];
 516                 sprintf(pat, "%%0%d%c", fmt >> NF_LSH, type == '0' ? 'd' : type);
 517                 sprintf(s, pat, n);
 518                 return 0;
 519         }
 520         return 1;
 521 }