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