roff.h

   1 /* predefined array limits */
   2 #define PATHLEN         1024    /* path length */
   3 #define NFILES          16      /* number of input files */
   4 #define NFONTS          32      /* number of fonts */
   5 #define NGLYPHS         1024    /* glyphs in fonts */
   6 #define NLIGS           128     /* number of font ligatures */
   7 #define NKERNS          1024    /* number of font kerning pairs */
   8 #define FNLEN           32      /* font name length */
   9 #define NMLEN           32      /* macro/register/environment/glyph name length */
  10 #define GNLEN           NMLEN   /* glyph name length */
  11 #define RNLEN           NMLEN   /* register/macro name */
  12 #define ILNLEN          1000    /* line limit of input files */
  13 #define LNLEN           4000    /* line buffer length (ren.c/out.c) */
  14 #define NWORDS          256     /* number of words in line buffer */
  15 #define NARGS           16      /* number of macro arguments */
  16 #define NPREV           16      /* environment stack depth */
  17 #define NTRAPS          1024    /* number of traps per page */
  18 #define NIES            128     /* number of nested .ie commands */
  19 #define NTABS           16      /* number of tab stops */
  20 #define NCMAPS          512     /* number of character translations (.tr) */
  21 #define NSSTR           32      /* number of nested sstr_push() calls */
  22 #define NFIELDS         32      /* number of fields */
  23 #define MAXFRAC         100000  /* maximum value of the fractional part */
  24 #define LIGLEN          4       /* length of ligatures */
  25 #define NCDEFS          128     /* number of character definitions (.char) */
  26
  27 /* converting scales */
  28 #define SC_IN           (dev_res)       /* inch in units */
  29 #define SC_PT           (SC_IN / 72)    /* point in units */
  30 #define SC_EM           (n_s * SC_IN / 72)
  31 #define SC_DW           (SC_EM / 3)     /* default width */
  32 #define SC_HT           (n_s * SC_PT)   /* character height */
  33
  34 /* escape sequences */
  35 #define ESC_Q   "bCDhHlLNoSvwxX"        /* \X'ccc' quoted escape sequences */
  36 #define ESC_P   "*fgkmns"               /* \Xc \X(cc \X[ccc] escape sequences */
  37
  38 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  39 #define MAX(a, b)       ((a) < (b) ? (b) : (a))
  40 #define LEN(a)          (sizeof(a) / sizeof((a)[0]))
  41
  42 /* special characters */
  43 extern int c_ec;        /* escape character (\) */
  44 extern int c_cc;        /* basic control character (.) */
  45 extern int c_c2;        /* no-break control character (') */
  46 #define c_ni    4       /* non-interpreted copy mode escape */
  47 #define c_hc    env_hc()/* hyphenation character */
  48 #define c_mc    env_mc()/* margin character (.mc) */
  49 #define c_tc    env_tc()
  50 #define c_lc    env_lc()
  51
  52 /* number registers */
  53 int num_get(int id, int inc);
  54 void num_set(int id, int val);
  55 void num_inc(int id, int val);
  56 void num_del(int id);
  57 char *num_str(int id);
  58 char *num_getfmt(int id);
  59 void num_setfmt(int id, char *fmt);
  60 int *nreg(int id);
  61 int eval(char *s, int unit);
  62 int eval_up(char **s, int unit);
  63 int eval_re(char *s, int orig, int unit);
  64
  65 /* string registers */
  66 void str_set(int id, char *s);
  67 void str_dset(int id, void *d);
  68 char *str_get(int id);
  69 void *str_dget(int id);
  70 void str_rm(int id);
  71 void str_rn(int src, int dst);
  72
  73 /* saving and restoring registers before and after printing diverted lines */
  74 void odiv_beg(void);
  75 void odiv_end(void);
  76
  77 /* enviroments */
  78 void env_init(void);
  79 void env_done(void);
  80 struct adj *env_adj(void);
  81 char *env_hc(void);
  82 char *env_mc(void);
  83 char *env_tc(void);
  84 char *env_lc(void);
  85 int tab_next(int pos);
  86 int tab_type(int pos);
  87
  88 /* device related variables */
  89 extern int dev_res;
  90 extern int dev_uwid;
  91 extern int dev_hor;
  92 extern int dev_ver;
  93
  94 struct glyph {
  95         char id[GNLEN];         /* device-dependent glyph identifier */
  96         char name[GNLEN];       /* the first character mapped to this glyph */
  97         struct font *font;      /* glyph font */
  98         int wid;                /* character width */
  99         int type;               /* character type; ascender/descender */
 100 };
 101
 102 struct font {
 103         char name[FNLEN];
 104         char fontname[FNLEN];
 105         struct glyph glyphs[NGLYPHS];
 106         int nglyphs;
 107         int spacewid;
 108         int special;
 109         int cs, bd;                     /* for .cs and .bd requests */
 110         /* charset section characters */
 111         char c[NGLYPHS][GNLEN];         /* character names in charset */
 112         struct glyph *g[NGLYPHS];       /* character glyphs in charset */
 113         struct glyph *g_map[NGLYPHS];   /* character remapped via font_map() */
 114         int n;                          /* number of characters in charset */
 115         /* glyph table based on the first character of their id fields in glyphs[] */
 116         int ghead[256];                 /* glyph list heads */
 117         int gnext[NGLYPHS];             /* next item in glyph lists */
 118         /* character table based on the first character of glyph names in c[] */
 119         int chead[256];                 /* character list heads */
 120         int cnext[NGLYPHS];             /* next item in character lists */
 121         /* font ligatures (lg*) */
 122         char lg[NLIGS][LIGLEN * GNLEN]; /* ligatures */
 123         int lgn;                        /* number of ligatures in lg[] */
 124         /* kerning pair table per glyph (kn*) */
 125         int knhead[NGLYPHS];            /* kerning pairs of glyphs[] */
 126         int knnext[NKERNS];             /* next item in knhead[] list */
 127         int knpair[NKERNS];             /* kerning pair 2nd glyphs */
 128         int knval[NKERNS];              /* font pairwise kerning value */
 129         int knn;                        /* number of kerning pairs */
 130 };
 131
 132 /* output device functions */
 133 int dev_open(char *dir, char *dev);
 134 void dev_close(void);
 135 int dev_mnt(int pos, char *id, char *name);
 136 int dev_pos(char *id);
 137 struct font *dev_font(int pos);
 138 int dev_fontpos(struct font *fn);
 139 void dev_setcs(int fn, int cs);
 140 int dev_getcs(int fn);
 141 void dev_setbd(int fn, int bd);
 142 int dev_getbd(int fn);
 143
 144 /* font-related functions */
 145 struct font *font_open(char *path);
 146 void font_close(struct font *fn);
 147 struct glyph *font_glyph(struct font *fn, char *id);
 148 struct glyph *font_find(struct font *fn, char *name);
 149 int font_lig(struct font *fn, char **c, int n);
 150 int font_kern(struct font *fn, char *c1, char *c2);
 151 int font_islig(struct font *fn, char *s);
 152 int font_map(struct font *fn, char *name, struct glyph *gl);
 153 int font_mapped(struct font *fn, char *name);
 154
 155 /* glyph handling functions */
 156 struct glyph *dev_glyph(char *c, int fn);
 157 struct glyph *dev_glyph_byid(char *id, int fn);
 158 int charwid(int fn, int sz, int wid);
 159 int spacewid(int fn, int sz);
 160 int charwid_base(int fn, int sz, int wid);
 161
 162 /* different layers of neatroff */
 163 int in_next(void);              /* input layer */
 164 int cp_next(void);              /* copy-mode layer */
 165 int tr_next(void);              /* troff layer */
 166
 167 void in_push(char *s, char **args);
 168 void in_pushnl(char *s, char **args);
 169 void in_so(char *path);         /* .so request */
 170 void in_nx(char *path);         /* .nx request */
 171 void in_ex(void);               /* .nx request */
 172 void in_lf(char *path, int ln); /* .lf request */
 173 void in_queue(char *path);      /* .ex request */
 174 char *in_arg(int i);            /* look up argument */
 175 int in_nargs(void);             /* number of arguments */
 176 void in_back(int c);            /* push back input character */
 177 int in_top(void);               /* the first pushed-back character */
 178 char *in_filename(void);        /* current filename */
 179 int in_lnum(void);              /* current line number */
 180
 181 void cp_blk(int skip);          /* skip or read the next line or block */
 182 void cp_wid(int enable);        /* control inlining \w requests */
 183 #define cp_back         in_back /* cp.c is stateless */
 184 void tr_first(void);            /* read until the first non-command line */
 185
 186 /* variable length string buffer */
 187 struct sbuf {
 188         char *s;                /* allocated buffer */
 189         int sz;                 /* buffer size */
 190         int n;                  /* length of the string stored in s */
 191 };
 192
 193 void sbuf_init(struct sbuf *sbuf);
 194 void sbuf_done(struct sbuf *sbuf);
 195 char *sbuf_buf(struct sbuf *sbuf);
 196 void sbuf_add(struct sbuf *sbuf, int c);
 197 void sbuf_append(struct sbuf *sbuf, char *s);
 198 void sbuf_printf(struct sbuf *sbuf, char *s, ...);
 199 void sbuf_putnl(struct sbuf *sbuf);
 200 void sbuf_cut(struct sbuf *sbuf, int n);
 201 int sbuf_len(struct sbuf *sbuf);
 202 int sbuf_empty(struct sbuf *sbuf);
 203
 204 /* word buffer */
 205 struct wb {
 206         struct sbuf sbuf;
 207         int f, s, m;            /* the last output font and size */
 208         int r_f, r_s, r_m;      /* current font and size; use n_f and n_s if -1 */
 209         int part;               /* partial input (\c) */
 210         int els_neg, els_pos;   /* extra line spacing */
 211         int h, v;               /* buffer vertical and horizontal positions */
 212         int ct, sb, st;         /* \w registers */
 213         /* saving previous characters added via wb_put() */
 214         char prev_c[LIGLEN][GNLEN];
 215         int prev_l[LIGLEN];     /* sbuf_len(&wb->sbuf) before wb_put() calls */
 216         int prev_h[LIGLEN];     /* wb->h before wb_put() calls */
 217         int prev_n;             /* number of characters in prev_c[] */
 218         int prev_ll;            /* sbuf_len(&wb->sbuf) after the last wb_put() */
 219 };
 220
 221 void wb_init(struct wb *wb);
 222 void wb_done(struct wb *wb);
 223 void wb_hmov(struct wb *wb, int n);
 224 void wb_vmov(struct wb *wb, int n);
 225 void wb_els(struct wb *wb, int els);
 226 void wb_etc(struct wb *wb, char *x);
 227 void wb_put(struct wb *wb, char *c);
 228 void wb_putexpand(struct wb *wb, char *c);
 229 int wb_part(struct wb *wb);
 230 void wb_setpart(struct wb *wb);
 231 void wb_drawl(struct wb *wb, int c, int h, int v);
 232 void wb_drawc(struct wb *wb, int c, int r);
 233 void wb_drawe(struct wb *wb, int c, int h, int v);
 234 void wb_drawa(struct wb *wb, int c, int h1, int v1, int h2, int v2);
 235 void wb_drawxbeg(struct wb *wb, int c);
 236 void wb_drawxdot(struct wb *wb, int h, int v);
 237 void wb_drawxend(struct wb *wb);
 238 void wb_cat(struct wb *wb, struct wb *src);
 239 int wb_hyph(struct wb *wb, int w, struct wb *w1, struct wb *w2, int flg);
 240 int wb_wid(struct wb *wb);
 241 int wb_empty(struct wb *wb);
 242 int wb_eos(struct wb *wb);
 243 void wb_wconf(struct wb *wb, int *ct, int *st, int *sb);
 244 int wb_lig(struct wb *wb, char *c);
 245 int wb_kern(struct wb *wb, char *c);
 246
 247 /* character translation (.tr) */
 248 void cmap_add(char *c1, char *c2);
 249 char *cmap_map(char *c);
 250 /* character definition (.char) */
 251 char *cdef_map(char *c, int fn);
 252 int cdef_expand(struct wb *wb, char *c, int fn);
 253
 254 /* hyphenation flags */
 255 #define HY_MASK         0x0f    /* enable hyphenation */
 256 #define HY_LAST         0x02    /* do not hyphenate last lines */
 257 #define HY_FINAL2       0x04    /* do not hyphenate the final two characters */
 258 #define HY_FIRST2       0x08    /* do not hyphenate the first two characters */
 259 #define HY_ANY          0x10    /* break at any possible position */
 260
 261 void hyphenate(char *hyphs, char *word, int flg);
 262
 263 /* adjustment */
 264 #define AD_L            0
 265 #define AD_B            1
 266 #define AD_C            3
 267 #define AD_R            5
 268
 269 struct adj *adj_alloc(void);
 270 void adj_free(struct adj *adj);
 271 int adj_fill(struct adj *adj, int ad_b, int fill, int hyph, struct sbuf *dst,
 272                 int *ll, int *in, int *ti, int *els_neg, int *els_pos);
 273 int adj_full(struct adj *adj, int fill);
 274 int adj_empty(struct adj *adj, int fill);
 275 int adj_wid(struct adj *adj);
 276 void adj_swid(struct adj *adj, int swid);
 277 void adj_ll(struct adj *adj, int ll);
 278 void adj_in(struct adj *adj, int in);
 279 void adj_ti(struct adj *adj, int ti);
 280 void adj_wb(struct adj *adj, struct wb *wb);
 281 void adj_nl(struct adj *adj);
 282 void adj_sp(struct adj *adj);
 283 void adj_nonl(struct adj *adj);
 284
 285 /* rendering */
 286 int render(void);                               /* the main loop */
 287 int ren_parse(struct wb *wb, char *c);
 288 int ren_char(struct wb *wb, int (*next)(void), void (*back)(int));
 289 int ren_wid(int (*next)(void), void (*back)(int));
 290 void ren_tl(int (*next)(void), void (*back)(int));
 291 void ren_hline(struct wb *wb, int l, char *c);  /* horizontal line */
 292 void ren_hlcmd(struct wb *wb, char *arg);       /* \l */
 293 void ren_vlcmd(struct wb *wb, char *arg);       /* \L */
 294 void ren_bcmd(struct wb *wb, char *arg);        /* \b */
 295 void ren_ocmd(struct wb *wb, char *arg);        /* \o */
 296 void ren_dcmd(struct wb *wb, char *arg);        /* \D */
 297
 298 /* out.c */
 299 void out_line(char *s);                         /* output rendered line */
 300 void out(char *s, ...);                         /* output troff cmd */
 301
 302 /* troff commands */
 303 void tr_ab(char **args);
 304 void tr_bp(char **args);
 305 void tr_br(char **args);
 306 void tr_ce(char **args);
 307 void tr_ch(char **args);
 308 void tr_cl(char **args);
 309 void tr_di(char **args);
 310 void tr_divbeg(char **args);
 311 void tr_divend(char **args);
 312 void tr_dt(char **args);
 313 void tr_em(char **args);
 314 void tr_ev(char **args);
 315 void tr_fc(char **args);
 316 void tr_fi(char **args);
 317 void tr_fp(char **args);
 318 void tr_fspecial(char **args);
 319 void tr_ft(char **args);
 320 void tr_hw(char **args);
 321 void tr_in(char **args);
 322 void tr_ll(char **args);
 323 void tr_mk(char **args);
 324 void tr_ne(char **args);
 325 void tr_nf(char **args);
 326 void tr_ns(char **args);
 327 void tr_os(char **args);
 328 void tr_pn(char **args);
 329 void tr_ps(char **args);
 330 void tr_rs(char **args);
 331 void tr_rt(char **args);
 332 void tr_sp(char **args);
 333 void tr_sv(char **args);
 334 void tr_ta(char **args);
 335 void tr_ti(char **args);
 336 void tr_wh(char **args);
 337 void tr_eject(char **args);
 338
 339 void tr_init(void);
 340
 341 /* helpers */
 342 void errmsg(char *msg, ...);
 343 void errdie(char *msg);
 344 int utf8len(int c);
 345 int utf8next(char *s, int (*next)(void));
 346 int utf8read(char **s, char *d);
 347 int utf8one(char *s);
 348 int charnext(char *c, int (*next)(void), void (*back)(int));
 349 int charread(char **s, char *c);
 350 int charnext_delim(char *c, int (*next)(void), void (*back)(int), char *delim);
 351 void charnext_str(char *d, char *c);
 352 void argnext(char *d, int cmd, int (*next)(void), void (*back)(int));
 353 void argread(char **sp, char *d, int cmd);
 354 int escread(char **s, char *d);
 355 /* string streams; nested next()/back() interface for string buffers */
 356 void sstr_push(char *s);
 357 char *sstr_pop(void);
 358 int sstr_next(void);
 359 void sstr_back(int c);
 360
 361 /* internal commands */
 362 #define TR_DIVBEG       "\07<"  /* diversion begins */
 363 #define TR_DIVEND       "\07>"  /* diversion ends */
 364 #define TR_EJECT        "\07P"  /* page eject */
 365
 366 /* mapping register, macro and environment names to indices */
 367 #define NREGS           4096    /* maximum number of mapped names */
 368 #define DOTMAP(c2)      (c2)    /* optimized mapping for ".x" names */
 369
 370 int map(char *s);               /* map name s to an index */
 371 char *map_name(int id);         /* return the name mapped to id */
 372
 373 /* colors */
 374 #define CLR_R(c)                (((c) >> 16) & 0xff)
 375 #define CLR_G(c)                (((c) >> 8) & 0xff)
 376 #define CLR_B(c)                ((c) & 0xff)
 377 #define CLR_RGB(r, g, b)        (((r) << 16) | ((g) << 8) | (b))
 378
 379 char *clr_str(int c);
 380 int clr_get(char *s);
 381
 382 /* builtin number registers; n_X for .X register */
 383 #define n_a             (*nreg(DOTMAP('a')))
 384 #define n_cp            (*nreg(DOTMAP('C')))
 385 #define n_d             (*nreg(DOTMAP('d')))
 386 #define n_f             (*nreg(DOTMAP('f')))
 387 #define n_h             (*nreg(DOTMAP('h')))
 388 #define n_i             (*nreg(DOTMAP('i')))
 389 #define n_it            (*nreg(map(".it")))     /* .it trap macro */
 390 #define n_itn           (*nreg(map(".itn")))    /* .it lines left */
 391 #define n_j             (*nreg(DOTMAP('j')))
 392 #define n_l             (*nreg(DOTMAP('l')))
 393 #define n_L             (*nreg(DOTMAP('L')))
 394 #define n_n             (*nreg(DOTMAP('n')))
 395 #define n_nI            (*nreg(map(".nI")))     /* i for .nm */
 396 #define n_nm            (*nreg(map(".nm")))     /* .nm enabled */
 397 #define n_nM            (*nreg(map(".nM")))     /* m for .nm */
 398 #define n_nn            (*nreg(map(".nn")))     /* remaining .nn */
 399 #define n_nS            (*nreg(map(".nS")))     /* s for .nm */
 400 #define n_m             (*nreg(DOTMAP('m')))
 401 #define n_mc            (*nreg(map(".mc")))     /* .mc enabled */
 402 #define n_mcn           (*nreg(map(".mcn")))    /* .mc distance */
 403 #define n_o             (*nreg(DOTMAP('o')))
 404 #define n_p             (*nreg(DOTMAP('p')))
 405 #define n_s             (*nreg(DOTMAP('s')))
 406 #define n_u             (*nreg(DOTMAP('u')))
 407 #define n_v             (*nreg(DOTMAP('v')))
 408 #define n_ct            (*nreg(map("ct")))
 409 #define n_dl            (*nreg(map("dl")))
 410 #define n_dn            (*nreg(map("dn")))
 411 #define n_ln            (*nreg(map("ln")))
 412 #define n_nl            (*nreg(map("nl")))
 413 #define n_sb            (*nreg(map("sb")))
 414 #define n_st            (*nreg(map("st")))
 415 #define n_pg            (*nreg(map("%")))       /* % */
 416 #define n_lb            (*nreg(map(".b0")))     /* input line beg */
 417 #define n_ce            (*nreg(map(".ce")))     /* .ce remaining */
 418 #define n_f0            (*nreg(map(".f0")))     /* last .f */
 419 #define n_lg            (*nreg(map(".lg")))     /* .lg mode */
 420 #define n_hy            (*nreg(map(".hy")))     /* .hy mode */
 421 #define n_i0            (*nreg(map(".i0")))     /* last .i */
 422 #define n_kn            (*nreg(map(".kern")))   /* .kn mode */
 423 #define n_l0            (*nreg(map(".l0")))     /* last .l */
 424 #define n_L0            (*nreg(map(".L0")))     /* last .L */
 425 #define n_m0            (*nreg(map(".m0")))     /* last .m */
 426 #define n_mk            (*nreg(map(".mk")))     /* .mk internal register */
 427 #define n_na            (*nreg(map(".na")))     /* .na mode */
 428 #define n_ns            (*nreg(map(".ns")))     /* .ns mode */
 429 #define n_o0            (*nreg(map(".o0")))     /* last .o */
 430 #define n_ss            (*nreg(map(".ss")))     /* .ss value */
 431 #define n_s0            (*nreg(map(".s0")))     /* last .s */
 432 #define n_sv            (*nreg(map(".sv")))     /* .sv value */
 433 #define n_lt            (*nreg(map(".lt")))     /* .lt value */
 434 #define n_t0            (*nreg(map(".lt0")))    /* previous .lt value */
 435 #define n_v0            (*nreg(map(".v0")))     /* last .v */
 436
 437 /* functions for implementing read-only registers */
 438 int f_nexttrap(void);   /* .t */
 439 int f_divreg(void);     /* .z */
 440 int f_hpos(void);       /* .k */