roff.h

   1 /*
   2  * Most functions and variables in neatroff are prefixed with tokens
   3  * that indicate their purpose, such as:
   4  *
   5  * + tr_xyz: the implementation of troff request .xyz (mostly tr.c)
   6  * + in_xyz: input layer (in.c)
   7  * + cp_xyz: copy-mode interpretation layer (cp.c)
   8  * + ren_xyz: rendering characters into lines (ren.c)
   9  * + out_xyz: output layer for generating troff output (out.c)
  10  * + dev_xyz: output devices (dev.c)
  11  * + num_xyz: number registers (reg.c)
  12  * + str_xyz: string registers (reg.c)
  13  * + env_xyz: environments (reg.c)
  14  * + eval_xyz: integer expression evaluation (eval.c)
  15  * + font_xyz: fonts (font.c)
  16  * + sbuf_xyz: variable length string buffers (sbuf.c)
  17  * + wb_xyz: word buffers (wb.c)
  18  * + adj_xyz: line adjustment buffers (adj.c)
  19  * + n_xyz: builtin number register xyz
  20  * + c_xyz: characters for requests like hc and mc
  21  *
  22  */
  23
  24 /* predefined array limits */
  25 #define PATHLEN         1024    /* path length */
  26 #define NFILES          16      /* number of input files */
  27 #define NFONTS          32      /* number of fonts */
  28 #define NGLYPHS         1024    /* glyphs in fonts */
  29 #define NLIGS           128     /* number of font ligatures */
  30 #define NKERNS          1024    /* number of font kerning pairs */
  31 #define FNLEN           32      /* font name length */
  32 #define NMLEN           32      /* macro/register/environment/glyph name length */
  33 #define GNLEN           NMLEN   /* glyph name length */
  34 #define RNLEN           NMLEN   /* register/macro name */
  35 #define ILNLEN          1000    /* line limit of input files */
  36 #define LNLEN           4000    /* line buffer length (ren.c/out.c) */
  37 #define NWORDS          256     /* number of words in line buffer */
  38 #define NARGS           16      /* number of macro arguments */
  39 #define NPREV           16      /* environment stack depth */
  40 #define NTRAPS          1024    /* number of traps per page */
  41 #define NIES            128     /* number of nested .ie commands */
  42 #define NTABS           16      /* number of tab stops */
  43 #define NCMAPS          512     /* number of character translations (.tr) */
  44 #define NSSTR           32      /* number of nested sstr_push() calls */
  45 #define NFIELDS         32      /* number of fields */
  46 #define MAXFRAC         100000  /* maximum value of the fractional part */
  47 #define LIGLEN          4       /* length of ligatures */
  48 #define NCDEFS          128     /* number of character definitions (.char) */
  49
  50 /* converting scales */
  51 #define SC_IN           (dev_res)       /* inch in units */
  52 #define SC_PT           (SC_IN / 72)    /* point in units */
  53 #define SC_EM           (n_s * SC_IN / 72)
  54
  55 /* escape sequences */
  56 #define ESC_Q   "bCDhHlLNoSvwxX"        /* \X'ccc' quoted escape sequences */
  57 #define ESC_P   "*fgkmns"               /* \Xc \X(cc \X[ccc] escape sequences */
  58
  59 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  60 #define MAX(a, b)       ((a) < (b) ? (b) : (a))
  61 #define LEN(a)          (sizeof(a) / sizeof((a)[0]))
  62
  63 /* special characters */
  64 extern int c_ec;        /* escape character (\) */
  65 extern int c_cc;        /* basic control character (.) */
  66 extern int c_c2;        /* no-break control character (') */
  67 #define c_ni    4       /* non-interpreted copy-mode escape */
  68 #define c_hc    env_hc()/* hyphenation character */
  69 #define c_mc    env_mc()/* margin character (.mc) */
  70 #define c_tc    env_tc()
  71 #define c_lc    env_lc()
  72 #define c_bp    "\\:"   /* zero-width word break point */
  73
  74 /* number registers */
  75 int num_get(int id, int inc);
  76 void num_set(int id, int val);
  77 void num_inc(int id, int val);
  78 void num_del(int id);
  79 char *num_str(int id);
  80 char *num_getfmt(int id);
  81 void num_setfmt(int id, char *fmt);
  82 int *nreg(int id);
  83 int eval(char *s, int unit);
  84 int eval_up(char **s, int unit);
  85 int eval_re(char *s, int orig, int unit);
  86
  87 /* string registers */
  88 void str_set(int id, char *s);
  89 void str_dset(int id, void *d);
  90 char *str_get(int id);
  91 void *str_dget(int id);
  92 void str_rm(int id);
  93 void str_rn(int src, int dst);
  94
  95 /* saving and restoring registers before and after printing diverted lines */
  96 void odiv_beg(void);
  97 void odiv_end(void);
  98
  99 /* enviroments */
 100 void env_init(void);
 101 void env_done(void);
 102 struct adj *env_adj(void);
 103 char *env_hc(void);
 104 char *env_mc(void);
 105 char *env_tc(void);
 106 char *env_lc(void);
 107 int tab_next(int pos);
 108 int tab_type(int pos);
 109
 110 /* device related variables */
 111 extern int dev_res;
 112 extern int dev_uwid;
 113 extern int dev_hor;
 114 extern int dev_ver;
 115
 116 struct glyph {
 117         char id[GNLEN];         /* device-dependent glyph identifier */
 118         char name[GNLEN];       /* the first character mapped to this glyph */
 119         struct font *font;      /* glyph font */
 120         int wid;                /* character width */
 121         int type;               /* character type; ascender/descender */
 122         int llx, lly, urx, ury; /* character bounding box */
 123 };
 124
 125 struct font {
 126         char name[FNLEN];
 127         char fontname[FNLEN];
 128         struct glyph glyphs[NGLYPHS];
 129         int nglyphs;
 130         int spacewid;
 131         int special;
 132         int cs, bd;                     /* for .cs and .bd requests */
 133         /* charset section characters */
 134         char c[NGLYPHS][GNLEN];         /* character names in charset */
 135         struct glyph *g[NGLYPHS];       /* character glyphs in charset */
 136         struct glyph *g_map[NGLYPHS];   /* character remapped via font_map() */
 137         int n;                          /* number of characters in charset */
 138         /* glyph table based on the first character of their id fields in glyphs[] */
 139         int ghead[256];                 /* glyph list heads */
 140         int gnext[NGLYPHS];             /* next item in glyph lists */
 141         /* character table based on the first character of glyph names in c[] */
 142         int chead[256];                 /* character list heads */
 143         int cnext[NGLYPHS];             /* next item in character lists */
 144         /* font ligatures (lg*) */
 145         char lg[NLIGS][LIGLEN * GNLEN]; /* ligatures */
 146         int lgn;                        /* number of ligatures in lg[] */
 147         /* kerning pair table per glyph (kn*) */
 148         int knhead[NGLYPHS];            /* kerning pairs of glyphs[] */
 149         int knnext[NKERNS];             /* next item in knhead[] list */
 150         int knpair[NKERNS];             /* kerning pair 2nd glyphs */
 151         int knval[NKERNS];              /* font pairwise kerning value */
 152         int knn;                        /* number of kerning pairs */
 153 };
 154
 155 /* output device functions */
 156 int dev_open(char *dir, char *dev);
 157 void dev_close(void);
 158 int dev_mnt(int pos, char *id, char *name);
 159 int dev_pos(char *id);
 160 struct font *dev_font(int pos);
 161 int dev_fontpos(struct font *fn);
 162 void dev_setcs(int fn, int cs);
 163 int dev_getcs(int fn);
 164 void dev_setbd(int fn, int bd);
 165 int dev_getbd(int fn);
 166
 167 /* font-related functions */
 168 struct font *font_open(char *path);
 169 void font_close(struct font *fn);
 170 struct glyph *font_glyph(struct font *fn, char *id);
 171 struct glyph *font_find(struct font *fn, char *name);
 172 int font_lig(struct font *fn, char **c, int n);
 173 int font_kern(struct font *fn, char *c1, char *c2);
 174 int font_islig(struct font *fn, char *s);
 175 int font_map(struct font *fn, char *name, struct glyph *gl);
 176 int font_mapped(struct font *fn, char *name);
 177
 178 /* glyph handling functions */
 179 struct glyph *dev_glyph(char *c, int fn);
 180 int charwid(int fn, int sz, int wid);
 181 int spacewid(int fn, int sz);
 182
 183 /* convert wid in device unitwidth size to size sz */
 184 #define DEVWID(sz, wid)         (((wid) * (sz) + (dev_uwid / 2)) / dev_uwid)
 185
 186 /* different layers of neatroff */
 187 int in_next(void);              /* input layer */
 188 int cp_next(void);              /* copy-mode layer */
 189 int tr_next(void);              /* troff layer */
 190
 191 void in_push(char *s, char **args);
 192 void in_pushnl(char *s, char **args);
 193 void in_so(char *path);         /* .so request */
 194 void in_nx(char *path);         /* .nx request */
 195 void in_ex(void);               /* .ex request */
 196 void in_lf(char *path, int ln); /* .lf request */
 197 void in_queue(char *path);      /* queue the given input file */
 198 char *in_arg(int i);            /* look up argument */
 199 int in_nargs(void);             /* number of arguments */
 200 void in_back(int c);            /* push back input character */
 201 int in_top(void);               /* the first pushed-back character */
 202 char *in_filename(void);        /* current filename */
 203 int in_lnum(void);              /* current line number */
 204
 205 void cp_blk(int skip);          /* skip or read the next line or block */
 206 void cp_wid(int enable);        /* control inlining \w requests */
 207 #define cp_back         in_back /* cp.c is stateless */
 208 void tr_first(void);            /* read until the first non-command line */
 209
 210 /* variable length string buffer */
 211 struct sbuf {
 212         char *s;                /* allocated buffer */
 213         int sz;                 /* buffer size */
 214         int n;                  /* length of the string stored in s */
 215 };
 216
 217 void sbuf_init(struct sbuf *sbuf);
 218 void sbuf_done(struct sbuf *sbuf);
 219 char *sbuf_buf(struct sbuf *sbuf);
 220 void sbuf_add(struct sbuf *sbuf, int c);
 221 void sbuf_append(struct sbuf *sbuf, char *s);
 222 void sbuf_printf(struct sbuf *sbuf, char *s, ...);
 223 void sbuf_putnl(struct sbuf *sbuf);
 224 void sbuf_cut(struct sbuf *sbuf, int n);
 225 int sbuf_len(struct sbuf *sbuf);
 226 int sbuf_empty(struct sbuf *sbuf);
 227
 228 /* word buffer */
 229 struct wb {
 230         struct sbuf sbuf;
 231         int f, s, m;            /* the last output font and size */
 232         int r_f, r_s, r_m;      /* current font and size; use n_f and n_s if -1 */
 233         int part;               /* partial input (\c) */
 234         int els_neg, els_pos;   /* extra line spacing */
 235         int h, v;               /* buffer vertical and horizontal positions */
 236         int ct, sb, st;         /* \w registers */
 237         int llx, lly, urx, ury; /* bounding box */
 238         int icleft_ll;          /* len after the pending left italic correction */
 239         /* saving previous characters added via wb_put() */
 240         char prev_c[LIGLEN][GNLEN];
 241         int prev_l[LIGLEN];     /* sbuf_len(&wb->sbuf) before wb_put() calls */
 242         int prev_h[LIGLEN];     /* wb->h before wb_put() calls */
 243         int prev_n;             /* number of characters in prev_c[] */
 244         int prev_ll;            /* sbuf_len(&wb->sbuf) after the last wb_put() */
 245 };
 246
 247 void wb_init(struct wb *wb);
 248 void wb_done(struct wb *wb);
 249 void wb_hmov(struct wb *wb, int n);
 250 void wb_vmov(struct wb *wb, int n);
 251 void wb_els(struct wb *wb, int els);
 252 void wb_etc(struct wb *wb, char *x);
 253 void wb_put(struct wb *wb, char *c);
 254 void wb_putexpand(struct wb *wb, char *c);
 255 int wb_part(struct wb *wb);
 256 void wb_setpart(struct wb *wb);
 257 void wb_drawl(struct wb *wb, int c, int h, int v);
 258 void wb_drawc(struct wb *wb, int c, int r);
 259 void wb_drawe(struct wb *wb, int c, int h, int v);
 260 void wb_drawa(struct wb *wb, int c, int h1, int v1, int h2, int v2);
 261 void wb_drawxbeg(struct wb *wb, int c);
 262 void wb_drawxdot(struct wb *wb, int h, int v);
 263 void wb_drawxend(struct wb *wb);
 264 void wb_italiccorrection(struct wb *wb);
 265 void wb_italiccorrectionleft(struct wb *wb);
 266 void wb_cat(struct wb *wb, struct wb *src);
 267 int wb_hyph(char *word, int w, struct wb *w1, struct wb *w2, int flg);
 268 int wb_wid(struct wb *wb);
 269 int wb_empty(struct wb *wb);
 270 int wb_eos(struct wb *wb);
 271 void wb_wconf(struct wb *wb, int *ct, int *st, int *sb,
 272                 int *llx, int *lly, int *urx, int *ury);
 273 int wb_lig(struct wb *wb, char *c);
 274 int wb_kern(struct wb *wb, char *c);
 275 void wb_reset(struct wb *wb);
 276 char *wb_buf(struct wb *wb);
 277
 278 /* character translation (.tr) */
 279 void cmap_add(char *c1, char *c2);
 280 char *cmap_map(char *c);
 281 /* character definition (.char) */
 282 char *cdef_map(char *c, int fn);
 283 int cdef_expand(struct wb *wb, char *c, int fn);
 284
 285 /* hyphenation flags */
 286 #define HY_MASK         0x0f    /* enable hyphenation */
 287 #define HY_LAST         0x02    /* do not hyphenate last lines */
 288 #define HY_FINAL2       0x04    /* do not hyphenate the final two characters */
 289 #define HY_FIRST2       0x08    /* do not hyphenate the first two characters */
 290 #define HY_ANY          0x10    /* break at any possible position */
 291
 292 void hyphenate(char *hyphs, char *word, int flg);
 293
 294 /* adjustment */
 295 #define AD_L            0
 296 #define AD_B            1
 297 #define AD_C            3
 298 #define AD_R            5
 299
 300 struct adj *adj_alloc(void);
 301 void adj_free(struct adj *adj);
 302 int adj_fill(struct adj *adj, int ad_b, int fill, int hyph, struct sbuf *dst,
 303                 int *li, int *ll, int *els_neg, int *els_pos);
 304 int adj_full(struct adj *adj, int fill);
 305 int adj_empty(struct adj *adj, int fill);
 306 int adj_wid(struct adj *adj);
 307 void adj_swid(struct adj *adj, int swid);
 308 void adj_wb(struct adj *adj, struct wb *wb);
 309 void adj_nl(struct adj *adj);
 310 void adj_sp(struct adj *adj);
 311 void adj_nonl(struct adj *adj);
 312
 313 /* rendering */
 314 int render(void);                               /* the main loop */
 315 int ren_parse(struct wb *wb, char *c);
 316 int ren_char(struct wb *wb, int (*next)(void), void (*back)(int));
 317 int ren_wid(int (*next)(void), void (*back)(int));
 318 void ren_tl(int (*next)(void), void (*back)(int));
 319 void ren_hline(struct wb *wb, int l, char *c);  /* horizontal line */
 320 void ren_hlcmd(struct wb *wb, char *arg);       /* \l */
 321 void ren_vlcmd(struct wb *wb, char *arg);       /* \L */
 322 void ren_bcmd(struct wb *wb, char *arg);        /* \b */
 323 void ren_ocmd(struct wb *wb, char *arg);        /* \o */
 324 void ren_dcmd(struct wb *wb, char *arg);        /* \D */
 325
 326 /* out.c */
 327 void out_line(char *s);                         /* output rendered line */
 328 void out(char *s, ...);                         /* output troff cmd */
 329
 330 /* troff commands */
 331 void tr_ab(char **args);
 332 void tr_bp(char **args);
 333 void tr_br(char **args);
 334 void tr_ce(char **args);
 335 void tr_ch(char **args);
 336 void tr_cl(char **args);
 337 void tr_di(char **args);
 338 void tr_divbeg(char **args);
 339 void tr_divend(char **args);
 340 void tr_dt(char **args);
 341 void tr_em(char **args);
 342 void tr_ev(char **args);
 343 void tr_fc(char **args);
 344 void tr_fi(char **args);
 345 void tr_fp(char **args);
 346 void tr_fspecial(char **args);
 347 void tr_ft(char **args);
 348 void tr_hw(char **args);
 349 void tr_in(char **args);
 350 void tr_ll(char **args);
 351 void tr_mk(char **args);
 352 void tr_ne(char **args);
 353 void tr_nf(char **args);
 354 void tr_ns(char **args);
 355 void tr_os(char **args);
 356 void tr_pn(char **args);
 357 void tr_ps(char **args);
 358 void tr_rs(char **args);
 359 void tr_rt(char **args);
 360 void tr_sp(char **args);
 361 void tr_sv(char **args);
 362 void tr_ta(char **args);
 363 void tr_ti(char **args);
 364 void tr_wh(char **args);
 365 void tr_eject(char **args);
 366
 367 void tr_init(void);
 368
 369 /* helpers */
 370 void errmsg(char *msg, ...);
 371 void errdie(char *msg);
 372 int utf8len(int c);
 373 int utf8next(char *s, int (*next)(void));
 374 int utf8read(char **s, char *d);
 375 int utf8one(char *s);
 376 int charnext(char *c, int (*next)(void), void (*back)(int));
 377 int charread(char **s, char *c);
 378 int charnext_delim(char *c, int (*next)(void), void (*back)(int), char *delim);
 379 void charnext_str(char *d, char *c);
 380 void argnext(char *d, int cmd, int (*next)(void), void (*back)(int));
 381 void argread(char **sp, char *d, int cmd);
 382 int escread(char **s, char *d);
 383 /* string streams; nested next()/back() interface for string buffers */
 384 void sstr_push(char *s);
 385 char *sstr_pop(void);
 386 int sstr_next(void);
 387 void sstr_back(int c);
 388
 389 /* internal commands */
 390 #define TR_DIVBEG       "\07<"  /* diversion begins */
 391 #define TR_DIVEND       "\07>"  /* diversion ends */
 392 #define TR_EJECT        "\07P"  /* page eject */
 393
 394 /* mapping register, macro and environment names to indices */
 395 #define NREGS           4096    /* maximum number of mapped names */
 396 #define DOTMAP(c2)      (c2)    /* optimized mapping for ".x" names */
 397
 398 int map(char *s);               /* map name s to an index */
 399 char *map_name(int id);         /* return the name mapped to id */
 400
 401 /* colors */
 402 #define CLR_R(c)                (((c) >> 16) & 0xff)
 403 #define CLR_G(c)                (((c) >> 8) & 0xff)
 404 #define CLR_B(c)                ((c) & 0xff)
 405 #define CLR_RGB(r, g, b)        (((r) << 16) | ((g) << 8) | (b))
 406
 407 char *clr_str(int c);
 408 int clr_get(char *s);
 409
 410 /* builtin number registers; n_X for .X register */
 411 #define n_a             (*nreg(DOTMAP('a')))
 412 #define n_cp            (*nreg(DOTMAP('C')))
 413 #define n_d             (*nreg(DOTMAP('d')))
 414 #define n_f             (*nreg(DOTMAP('f')))
 415 #define n_h             (*nreg(DOTMAP('h')))
 416 #define n_i             (*nreg(DOTMAP('i')))
 417 #define n_it            (*nreg(map(".it")))     /* .it trap macro */
 418 #define n_itn           (*nreg(map(".itn")))    /* .it lines left */
 419 #define n_j             (*nreg(DOTMAP('j')))
 420 #define n_l             (*nreg(DOTMAP('l')))
 421 #define n_L             (*nreg(DOTMAP('L')))
 422 #define n_n             (*nreg(DOTMAP('n')))
 423 #define n_nI            (*nreg(map(".nI")))     /* i for .nm */
 424 #define n_nm            (*nreg(map(".nm")))     /* .nm enabled */
 425 #define n_nM            (*nreg(map(".nM")))     /* m for .nm */
 426 #define n_nn            (*nreg(map(".nn")))     /* remaining .nn */
 427 #define n_nS            (*nreg(map(".nS")))     /* s for .nm */
 428 #define n_m             (*nreg(DOTMAP('m')))
 429 #define n_mc            (*nreg(map(".mc")))     /* .mc enabled */
 430 #define n_mcn           (*nreg(map(".mcn")))    /* .mc distance */
 431 #define n_o             (*nreg(DOTMAP('o')))
 432 #define n_p             (*nreg(DOTMAP('p')))
 433 #define n_s             (*nreg(DOTMAP('s')))
 434 #define n_u             (*nreg(DOTMAP('u')))
 435 #define n_v             (*nreg(DOTMAP('v')))
 436 #define n_ct            (*nreg(map("ct")))
 437 #define n_dl            (*nreg(map("dl")))
 438 #define n_dn            (*nreg(map("dn")))
 439 #define n_ln            (*nreg(map("ln")))
 440 #define n_nl            (*nreg(map("nl")))
 441 #define n_sb            (*nreg(map("sb")))
 442 #define n_st            (*nreg(map("st")))
 443 #define n_pg            (*nreg(map("%")))       /* % */
 444 #define n_lb            (*nreg(map(".b0")))     /* input line beg */
 445 #define n_ce            (*nreg(map(".ce")))     /* .ce remaining */
 446 #define n_f0            (*nreg(map(".f0")))     /* last .f */
 447 #define n_lg            (*nreg(map(".lg")))     /* .lg mode */
 448 #define n_hy            (*nreg(map(".hy")))     /* .hy mode */
 449 #define n_i0            (*nreg(map(".i0")))     /* last .i */
 450 #define n_ti            (*nreg(map(".ti")))     /* pending .ti */
 451 #define n_kn            (*nreg(map(".kern")))   /* .kn mode */
 452 #define n_l0            (*nreg(map(".l0")))     /* last .l */
 453 #define n_L0            (*nreg(map(".L0")))     /* last .L */
 454 #define n_m0            (*nreg(map(".m0")))     /* last .m */
 455 #define n_mk            (*nreg(map(".mk")))     /* .mk internal register */
 456 #define n_na            (*nreg(map(".na")))     /* .na mode */
 457 #define n_ns            (*nreg(map(".ns")))     /* .ns mode */
 458 #define n_o0            (*nreg(map(".o0")))     /* last .o */
 459 #define n_ss            (*nreg(map(".ss")))     /* .ss value */
 460 #define n_s0            (*nreg(map(".s0")))     /* last .s */
 461 #define n_sv            (*nreg(map(".sv")))     /* .sv value */
 462 #define n_lt            (*nreg(map(".lt")))     /* .lt value */
 463 #define n_t0            (*nreg(map(".lt0")))    /* previous .lt value */
 464 #define n_v0            (*nreg(map(".v0")))     /* last .v */
 465 #define n_llx           (*nreg(map("bbllx")))   /* \w bounding box */
 466 #define n_lly           (*nreg(map("bblly")))   /* \w bounding box */
 467 #define n_urx           (*nreg(map("bburx")))   /* \w bounding box */
 468 #define n_ury           (*nreg(map("bbury")))   /* \w bounding box */
 469
 470 /* functions for implementing read-only registers */
 471 int f_nexttrap(void);   /* .t */
 472 int f_divreg(void);     /* .z */
 473 int f_hpos(void);       /* .k */