2 * Most functions and variables in neatroff are prefixed with tokens
3 * that indicate their purpose, such as:
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 * + fmt_xyz: line formatting buffers (fmt.c)
19 * + n_xyz: builtin number register xyz
20 * + c_xyz: characters for requests like hc and mc
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 1024 /* number of queued words in formatting buffer */
38 #define NLINES 32 /* number of queued lines in formatting buffer */
39 #define NARGS 16 /* number of macro arguments */
40 #define NPREV 16 /* environment stack depth */
41 #define NTRAPS 1024 /* number of traps per page */
42 #define NIES 128 /* number of nested .ie commands */
43 #define NTABS 16 /* number of tab stops */
44 #define NCMAPS 512 /* number of character translations (.tr) */
45 #define NSSTR 32 /* number of nested sstr_push() calls */
46 #define NFIELDS 32 /* number of fields */
47 #define MAXFRAC 100000 /* maximum value of the fractional part */
48 #define LIGLEN 4 /* length of ligatures */
49 #define NCDEFS 128 /* number of character definitions (.char) */
50 #define HYHWN 1024 /* hyphenation dictionary size (.hw) */
51 #define NHYPHS 8 /* maximum hyphenations per word */
53 /* converting scales */
54 #define SC_IN (dev_res) /* inch in units */
55 #define SC_PT (SC_IN / 72) /* point in units */
56 #define SC_EM (n_s * SC_IN / 72)
58 /* escape sequences */
59 #define ESC_Q "bCDhHlLNoSvwxX" /* \X'ccc' quoted escape sequences */
60 #define ESC_P "*fgkmns" /* \Xc \X(cc \X[ccc] escape sequences */
62 #define MIN(a, b) ((a) < (b) ? (a) : (b))
63 #define MAX(a, b) ((a) < (b) ? (b) : (a))
64 #define LEN(a) (sizeof(a) / sizeof((a)[0]))
66 /* special characters */
67 extern int c_ec
; /* escape character (\) */
68 extern int c_cc
; /* basic control character (.) */
69 extern int c_c2
; /* no-break control character (') */
70 #define c_ni 4 /* non-interpreted copy-mode escape */
71 #define c_hc env_hc()/* hyphenation character */
72 #define c_mc env_mc()/* margin character (.mc) */
75 #define c_bp "\\:" /* zero-width word break point */
77 /* number registers */
78 int num_get(int id
, int inc
);
79 void num_set(int id
, int val
);
80 void num_inc(int id
, int val
);
82 char *num_str(int id
);
83 char *num_getfmt(int id
);
84 void num_setfmt(int id
, char *fmt
);
86 int eval(char *s
, int unit
);
87 int eval_up(char **s
, int unit
);
88 int eval_re(char *s
, int orig
, int unit
);
90 /* string registers */
91 void str_set(int id
, char *s
);
92 void str_dset(int id
, void *d
);
93 char *str_get(int id
);
94 void *str_dget(int id
);
96 void str_rn(int src
, int dst
);
98 /* saving and restoring registers before and after printing diverted lines */
105 struct fmt
*env_fmt(void);
110 int tab_next(int pos
);
111 int tab_type(int pos
);
113 /* device related variables */
120 char id
[GNLEN
]; /* device-dependent glyph identifier */
121 char name
[GNLEN
]; /* the first character mapped to this glyph */
122 struct font
*font
; /* glyph font */
123 int wid
; /* character width */
124 int type
; /* character type; ascender/descender */
125 int llx
, lly
, urx
, ury
; /* character bounding box */
130 char fontname
[FNLEN
];
131 struct glyph glyphs
[NGLYPHS
];
135 int cs
, bd
; /* for .cs and .bd requests */
136 /* charset section characters */
137 char c
[NGLYPHS
][GNLEN
]; /* character names in charset */
138 struct glyph
*g
[NGLYPHS
]; /* character glyphs in charset */
139 struct glyph
*g_map
[NGLYPHS
]; /* character remapped via font_map() */
140 int n
; /* number of characters in charset */
141 /* glyph table based on the first character of their id fields in glyphs[] */
142 int ghead
[256]; /* glyph list heads */
143 int gnext
[NGLYPHS
]; /* next item in glyph lists */
144 /* character table based on the first character of glyph names in c[] */
145 int chead
[256]; /* character list heads */
146 int cnext
[NGLYPHS
]; /* next item in character lists */
147 /* font ligatures (lg*) */
148 char lg
[NLIGS
][LIGLEN
* GNLEN
]; /* ligatures */
149 int lgn
; /* number of ligatures in lg[] */
150 /* kerning pair table per glyph (kn*) */
151 int knhead
[NGLYPHS
]; /* kerning pairs of glyphs[] */
152 int knnext
[NKERNS
]; /* next item in knhead[] list */
153 int knpair
[NKERNS
]; /* kerning pair 2nd glyphs */
154 int knval
[NKERNS
]; /* font pairwise kerning value */
155 int knn
; /* number of kerning pairs */
158 /* output device functions */
159 int dev_open(char *dir
, char *dev
);
160 void dev_close(void);
161 int dev_mnt(int pos
, char *id
, char *name
);
162 int dev_pos(char *id
);
163 struct font
*dev_font(int pos
);
164 int dev_fontpos(struct font
*fn
);
165 void dev_setcs(int fn
, int cs
);
166 int dev_getcs(int fn
);
167 void dev_setbd(int fn
, int bd
);
168 int dev_getbd(int fn
);
170 /* font-related functions */
171 struct font
*font_open(char *path
);
172 void font_close(struct font
*fn
);
173 struct glyph
*font_glyph(struct font
*fn
, char *id
);
174 struct glyph
*font_find(struct font
*fn
, char *name
);
175 int font_lig(struct font
*fn
, char **c
, int n
);
176 int font_kern(struct font
*fn
, char *c1
, char *c2
);
177 int font_islig(struct font
*fn
, char *s
);
178 int font_map(struct font
*fn
, char *name
, struct glyph
*gl
);
179 int font_mapped(struct font
*fn
, char *name
);
181 /* glyph handling functions */
182 struct glyph
*dev_glyph(char *c
, int fn
);
183 int charwid(int fn
, int sz
, int wid
);
185 /* convert wid in device unitwidth size to size sz */
186 #define DEVWID(sz, wid) (((wid) * (sz) + (dev_uwid / 2)) / dev_uwid)
187 /* the amount of word and sentence space for the given font and size */
188 #define N_SS(fn, sz) (charwid((fn), (sz), (dev_font(fn)->spacewid * n_ss + 6) / 12))
189 #define N_SSS(fn, sz) (charwid((fn), (sz), (dev_font(fn)->spacewid * n_sss + 6) / 12))
191 /* different layers of neatroff */
192 int in_next(void); /* input layer */
193 int cp_next(void); /* copy-mode layer */
194 int tr_next(void); /* troff layer */
196 void in_push(char *s
, char **args
);
197 void in_pushnl(char *s
, char **args
);
198 void in_so(char *path
); /* .so request */
199 void in_nx(char *path
); /* .nx request */
200 void in_ex(void); /* .ex request */
201 void in_lf(char *path
, int ln
); /* .lf request */
202 void in_queue(char *path
); /* queue the given input file */
203 char *in_arg(int i
); /* look up argument */
204 int in_nargs(void); /* number of arguments */
205 void in_back(int c
); /* push back input character */
206 int in_top(void); /* the first pushed-back character */
207 char *in_filename(void); /* current filename */
208 int in_lnum(void); /* current line number */
210 void cp_blk(int skip
); /* skip or read the next line or block */
211 void cp_wid(int enable
); /* control inlining \w requests */
212 #define cp_back in_back /* cp.c is stateless */
213 int tr_nextreq(void); /* read the next troff request */
215 /* variable length string buffer */
217 char *s
; /* allocated buffer */
218 int sz
; /* buffer size */
219 int n
; /* length of the string stored in s */
222 void sbuf_init(struct sbuf
*sbuf
);
223 void sbuf_done(struct sbuf
*sbuf
);
224 char *sbuf_buf(struct sbuf
*sbuf
);
225 void sbuf_add(struct sbuf
*sbuf
, int c
);
226 void sbuf_append(struct sbuf
*sbuf
, char *s
);
227 void sbuf_printf(struct sbuf
*sbuf
, char *s
, ...);
228 void sbuf_putnl(struct sbuf
*sbuf
);
229 void sbuf_cut(struct sbuf
*sbuf
, int n
);
230 int sbuf_len(struct sbuf
*sbuf
);
231 int sbuf_empty(struct sbuf
*sbuf
);
236 int f
, s
, m
; /* the last output font and size */
237 int r_f
, r_s
, r_m
; /* current font and size; use n_f and n_s if -1 */
238 int part
; /* partial input (\c) */
239 int els_neg
, els_pos
; /* extra line spacing */
240 int h
, v
; /* buffer vertical and horizontal positions */
241 int ct
, sb
, st
; /* \w registers */
242 int llx
, lly
, urx
, ury
; /* bounding box */
243 int icleft_ll
; /* len after the pending left italic correction */
244 /* saving previous characters added via wb_put() */
245 char prev_c
[LIGLEN
][GNLEN
];
246 int prev_l
[LIGLEN
]; /* sbuf_len(&wb->sbuf) before wb_put() calls */
247 int prev_h
[LIGLEN
]; /* wb->h before wb_put() calls */
248 int prev_n
; /* number of characters in prev_c[] */
249 int prev_ll
; /* sbuf_len(&wb->sbuf) after the last wb_put() */
252 void wb_init(struct wb
*wb
);
253 void wb_done(struct wb
*wb
);
254 void wb_hmov(struct wb
*wb
, int n
);
255 void wb_vmov(struct wb
*wb
, int n
);
256 void wb_els(struct wb
*wb
, int els
);
257 void wb_etc(struct wb
*wb
, char *x
);
258 void wb_put(struct wb
*wb
, char *c
);
259 void wb_putexpand(struct wb
*wb
, char *c
);
260 int wb_part(struct wb
*wb
);
261 void wb_setpart(struct wb
*wb
);
262 void wb_drawl(struct wb
*wb
, int c
, int h
, int v
);
263 void wb_drawc(struct wb
*wb
, int c
, int r
);
264 void wb_drawe(struct wb
*wb
, int c
, int h
, int v
);
265 void wb_drawa(struct wb
*wb
, int c
, int h1
, int v1
, int h2
, int v2
);
266 void wb_drawxbeg(struct wb
*wb
, int c
);
267 void wb_drawxdot(struct wb
*wb
, int h
, int v
);
268 void wb_drawxend(struct wb
*wb
);
269 void wb_italiccorrection(struct wb
*wb
);
270 void wb_italiccorrectionleft(struct wb
*wb
);
271 void wb_cat(struct wb
*wb
, struct wb
*src
);
272 void wb_catstr(struct wb
*wb
, char *beg
, char *end
);
273 int wb_hyphmark(char *word
, int *hyidx
, int *hyins
);
274 int wb_hyph(char *word
, int *hyidx
, int flg
);
275 int wb_wid(struct wb
*wb
);
276 int wb_dashwid(struct wb
*wb
);
277 int wb_empty(struct wb
*wb
);
278 int wb_eos(struct wb
*wb
);
279 void wb_wconf(struct wb
*wb
, int *ct
, int *st
, int *sb
,
280 int *llx
, int *lly
, int *urx
, int *ury
);
281 int wb_lig(struct wb
*wb
, char *c
);
282 int wb_kern(struct wb
*wb
, char *c
);
283 void wb_reset(struct wb
*wb
);
284 char *wb_buf(struct wb
*wb
);
285 void wb_fnszget(struct wb
*wb
, int *fn
, int *sz
, int *m
);
286 void wb_fnszset(struct wb
*wb
, int fn
, int sz
, int m
);
288 /* character translation (.tr) */
289 void cmap_add(char *c1
, char *c2
);
290 char *cmap_map(char *c
);
291 /* character definition (.char) */
292 char *cdef_map(char *c
, int fn
);
293 int cdef_expand(struct wb
*wb
, char *c
, int fn
);
295 /* hyphenation flags */
296 #define HY_LAST 0x02 /* do not hyphenate last lines */
297 #define HY_FINAL2 0x04 /* do not hyphenate the final two characters */
298 #define HY_FIRST2 0x08 /* do not hyphenate the first two characters */
300 void hyphenate(char *hyphs
, char *word
, int flg
);
302 /* adjustment types */
303 #define AD_C 0 /* center */
304 #define AD_L 1 /* adjust left margin (flag) */
305 #define AD_R 2 /* adjust right margin (flag) */
306 #define AD_B 3 /* adjust both margin (mask) */
307 #define AD_P 4 /* paragraph-at-once adjustment (flag) */
309 /* line formatting */
310 struct fmt
*fmt_alloc(void);
311 void fmt_free(struct fmt
*fmt
);
312 int fmt_wid(struct fmt
*fmt
);
313 void fmt_space(struct fmt
*fmt
);
314 void fmt_suppressnl(struct fmt
*fmt
);
315 int fmt_word(struct fmt
*fmt
, struct wb
*wb
);
316 int fmt_newline(struct fmt
*fmt
);
317 int fmt_fillreq(struct fmt
*f
);
318 int fmt_br(struct fmt
*fmt
);
319 int fmt_fill(struct fmt
*fmt
);
320 int fmt_morelines(struct fmt
*fmt
);
321 int fmt_morewords(struct fmt
*fmt
);
322 int fmt_nextline(struct fmt
*fmt
, struct sbuf
*sbuf
, int *w
,
323 int *li
, int *ll
, int *els_neg
, int *els_pos
);
326 int render(void); /* the main loop */
327 int ren_parse(struct wb
*wb
, char *c
);
328 int ren_char(struct wb
*wb
, int (*next
)(void), void (*back
)(int));
329 int ren_wid(int (*next
)(void), void (*back
)(int));
330 void ren_tl(int (*next
)(void), void (*back
)(int));
331 void ren_hline(struct wb
*wb
, int l
, char *c
); /* horizontal line */
332 void ren_hlcmd(struct wb
*wb
, char *arg
); /* \l */
333 void ren_vlcmd(struct wb
*wb
, char *arg
); /* \L */
334 void ren_bcmd(struct wb
*wb
, char *arg
); /* \b */
335 void ren_ocmd(struct wb
*wb
, char *arg
); /* \o */
336 void ren_dcmd(struct wb
*wb
, char *arg
); /* \D */
339 void out_line(char *s
); /* output rendered line */
340 void out(char *s
, ...); /* output troff cmd */
343 void tr_ab(char **args
);
344 void tr_bp(char **args
);
345 void tr_br(char **args
);
346 void tr_ce(char **args
);
347 void tr_ch(char **args
);
348 void tr_cl(char **args
);
349 void tr_di(char **args
);
350 void tr_divbeg(char **args
);
351 void tr_divend(char **args
);
352 void tr_dt(char **args
);
353 void tr_em(char **args
);
354 void tr_ev(char **args
);
355 void tr_fc(char **args
);
356 void tr_fi(char **args
);
357 void tr_fp(char **args
);
358 void tr_fspecial(char **args
);
359 void tr_ft(char **args
);
360 void tr_hw(char **args
);
361 void tr_in(char **args
);
362 void tr_ll(char **args
);
363 void tr_mk(char **args
);
364 void tr_ne(char **args
);
365 void tr_nf(char **args
);
366 void tr_ns(char **args
);
367 void tr_os(char **args
);
368 void tr_pn(char **args
);
369 void tr_ps(char **args
);
370 void tr_rs(char **args
);
371 void tr_rt(char **args
);
372 void tr_sp(char **args
);
373 void tr_sv(char **args
);
374 void tr_ta(char **args
);
375 void tr_ti(char **args
);
376 void tr_wh(char **args
);
377 void tr_popren(char **args
);
382 void errmsg(char *msg
, ...);
383 void errdie(char *msg
);
385 int utf8next(char *s
, int (*next
)(void));
386 int utf8read(char **s
, char *d
);
387 int utf8one(char *s
);
388 int charnext(char *c
, int (*next
)(void), void (*back
)(int));
389 int charread(char **s
, char *c
);
390 int charnext_delim(char *c
, int (*next
)(void), void (*back
)(int), char *delim
);
391 void charnext_str(char *d
, char *c
);
392 void argnext(char *d
, int cmd
, int (*next
)(void), void (*back
)(int));
393 void argread(char **sp
, char *d
, int cmd
);
394 int escread(char **s
, char *d
);
395 /* string streams; nested next()/back() interface for string buffers */
396 void sstr_push(char *s
);
397 char *sstr_pop(void);
399 void sstr_back(int c
);
401 /* internal commands */
402 #define TR_DIVBEG "\07<" /* diversion begins */
403 #define TR_DIVEND "\07>" /* diversion ends */
404 #define TR_POPREN "\07P" /* exit render_rec() */
406 /* mapping register, macro and environment names to indices */
407 #define NREGS 4096 /* maximum number of mapped names */
408 #define DOTMAP(c2) (c2) /* optimized mapping for ".x" names */
410 int map(char *s
); /* map name s to an index */
411 char *map_name(int id
); /* return the name mapped to id */
414 #define CLR_R(c) (((c) >> 16) & 0xff)
415 #define CLR_G(c) (((c) >> 8) & 0xff)
416 #define CLR_B(c) ((c) & 0xff)
417 #define CLR_RGB(r, g, b) (((r) << 16) | ((g) << 8) | (b))
419 char *clr_str(int c
);
420 int clr_get(char *s
);
422 /* builtin number registers; n_X for .X register */
423 #define n_a (*nreg(DOTMAP('a')))
424 #define n_cp (*nreg(DOTMAP('C')))
425 #define n_d (*nreg(DOTMAP('d')))
426 #define n_f (*nreg(DOTMAP('f')))
427 #define n_h (*nreg(DOTMAP('h')))
428 #define n_i (*nreg(DOTMAP('i')))
429 #define n_it (*nreg(map(".it"))) /* .it trap macro */
430 #define n_itn (*nreg(map(".itn"))) /* .it lines left */
431 #define n_j (*nreg(DOTMAP('j')))
432 #define n_l (*nreg(DOTMAP('l')))
433 #define n_L (*nreg(DOTMAP('L')))
434 #define n_n (*nreg(DOTMAP('n')))
435 #define n_nI (*nreg(map(".nI"))) /* i for .nm */
436 #define n_nm (*nreg(map(".nm"))) /* .nm enabled */
437 #define n_nM (*nreg(map(".nM"))) /* m for .nm */
438 #define n_nn (*nreg(map(".nn"))) /* remaining .nn */
439 #define n_nS (*nreg(map(".nS"))) /* s for .nm */
440 #define n_m (*nreg(DOTMAP('m')))
441 #define n_mc (*nreg(map(".mc"))) /* .mc enabled */
442 #define n_mcn (*nreg(map(".mcn"))) /* .mc distance */
443 #define n_o (*nreg(DOTMAP('o')))
444 #define n_p (*nreg(DOTMAP('p')))
445 #define n_s (*nreg(DOTMAP('s')))
446 #define n_u (*nreg(DOTMAP('u')))
447 #define n_v (*nreg(DOTMAP('v')))
448 #define n_ct (*nreg(map("ct")))
449 #define n_dl (*nreg(map("dl")))
450 #define n_dn (*nreg(map("dn")))
451 #define n_ln (*nreg(map("ln")))
452 #define n_nl (*nreg(map("nl")))
453 #define n_sb (*nreg(map("sb")))
454 #define n_st (*nreg(map("st")))
455 #define n_pg (*nreg(map("%"))) /* % */
456 #define n_lb (*nreg(map(".b0"))) /* input line beg */
457 #define n_ce (*nreg(map(".ce"))) /* .ce remaining */
458 #define n_f0 (*nreg(map(".f0"))) /* last .f */
459 #define n_lg (*nreg(map(".lg"))) /* .lg mode */
460 #define n_hy (*nreg(map(".hy"))) /* .hy mode */
461 #define n_hyp (*nreg(map(".hyp"))) /* hyphenation penalty */
462 #define n_i0 (*nreg(map(".i0"))) /* last .i */
463 #define n_ti (*nreg(map(".ti"))) /* pending .ti */
464 #define n_kn (*nreg(map(".kern"))) /* .kn mode */
465 #define n_l0 (*nreg(map(".l0"))) /* last .l */
466 #define n_L0 (*nreg(map(".L0"))) /* last .L */
467 #define n_m0 (*nreg(map(".m0"))) /* last .m */
468 #define n_mk (*nreg(map(".mk"))) /* .mk internal register */
469 #define n_na (*nreg(map(".na"))) /* .na mode */
470 #define n_ns (*nreg(map(".ns"))) /* .ns mode */
471 #define n_o0 (*nreg(map(".o0"))) /* last .o */
472 #define n_ss (*nreg(map(".ss"))) /* word space (.ss) */
473 #define n_sss (*nreg(map(".sss"))) /* sentence space (.ss) */
474 #define n_ssh (*nreg(map(".ssh"))) /* word space compression (.ssh) */
475 #define n_s0 (*nreg(map(".s0"))) /* last .s */
476 #define n_sv (*nreg(map(".sv"))) /* .sv value */
477 #define n_lt (*nreg(map(".lt"))) /* .lt value */
478 #define n_t0 (*nreg(map(".lt0"))) /* previous .lt value */
479 #define n_v0 (*nreg(map(".v0"))) /* last .v */
480 #define n_llx (*nreg(map("bbllx"))) /* \w bounding box */
481 #define n_lly (*nreg(map("bblly"))) /* \w bounding box */
482 #define n_urx (*nreg(map("bburx"))) /* \w bounding box */
483 #define n_ury (*nreg(map("bbury"))) /* \w bounding box */
485 /* functions for implementing read-only registers */
486 int f_nexttrap(void); /* .t */
487 int f_divreg(void); /* .z */
488 int f_hpos(void); /* .k */