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