ref: dc80a8d4a5fdba90f8962a732be7f5a3b3601b51
dir: /roff.h/
/*
* Most functions and variables in neatroff are prefixed with tokens
* that indicate their purpose, such as:
*
* + tr_xyz: the implementation of troff request .xyz (mostly tr.c)
* + in_xyz: input layer (in.c)
* + cp_xyz: copy-mode interpretation layer (cp.c)
* + ren_xyz: rendering characters into lines (ren.c)
* + out_xyz: output layer for generating troff output (out.c)
* + dev_xyz: output devices (dev.c)
* + num_xyz: number registers (reg.c)
* + str_xyz: string registers (reg.c)
* + env_xyz: environments (reg.c)
* + eval_xyz: integer expression evaluation (eval.c)
* + font_xyz: fonts (font.c)
* + sbuf_xyz: variable length string buffers (sbuf.c)
* + wb_xyz: word buffers (wb.c)
* + adj_xyz: line adjustment buffers (adj.c)
* + n_xyz: builtin number register xyz
* + c_xyz: characters for requests like hc and mc
*
*/
/* predefined array limits */
#define PATHLEN 1024 /* path length */
#define NFILES 16 /* number of input files */
#define NFONTS 32 /* number of fonts */
#define NGLYPHS 1024 /* glyphs in fonts */
#define NLIGS 128 /* number of font ligatures */
#define NKERNS 1024 /* number of font kerning pairs */
#define FNLEN 32 /* font name length */
#define NMLEN 32 /* macro/register/environment/glyph name length */
#define GNLEN NMLEN /* glyph name length */
#define RNLEN NMLEN /* register/macro name */
#define ILNLEN 1000 /* line limit of input files */
#define LNLEN 4000 /* line buffer length (ren.c/out.c) */
#define NWORDS 256 /* number of words in line buffer */
#define NARGS 16 /* number of macro arguments */
#define NPREV 16 /* environment stack depth */
#define NTRAPS 1024 /* number of traps per page */
#define NIES 128 /* number of nested .ie commands */
#define NTABS 16 /* number of tab stops */
#define NCMAPS 512 /* number of character translations (.tr) */
#define NSSTR 32 /* number of nested sstr_push() calls */
#define NFIELDS 32 /* number of fields */
#define MAXFRAC 100000 /* maximum value of the fractional part */
#define LIGLEN 4 /* length of ligatures */
#define NCDEFS 128 /* number of character definitions (.char) */
/* converting scales */
#define SC_IN (dev_res) /* inch in units */
#define SC_PT (SC_IN / 72) /* point in units */
#define SC_EM (n_s * SC_IN / 72)
/* escape sequences */
#define ESC_Q "bCDhHlLNoSvwxX" /* \X'ccc' quoted escape sequences */
#define ESC_P "*fgkmns" /* \Xc \X(cc \X[ccc] escape sequences */
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a) / sizeof((a)[0]))
/* special characters */
extern int c_ec; /* escape character (\) */
extern int c_cc; /* basic control character (.) */
extern int c_c2; /* no-break control character (') */
#define c_ni 4 /* non-interpreted copy-mode escape */
#define c_hc env_hc()/* hyphenation character */
#define c_mc env_mc()/* margin character (.mc) */
#define c_tc env_tc()
#define c_lc env_lc()
#define c_bp "\\:" /* zero-width word break point */
/* number registers */
int num_get(int id, int inc);
void num_set(int id, int val);
void num_inc(int id, int val);
void num_del(int id);
char *num_str(int id);
char *num_getfmt(int id);
void num_setfmt(int id, char *fmt);
int *nreg(int id);
int eval(char *s, int unit);
int eval_up(char **s, int unit);
int eval_re(char *s, int orig, int unit);
/* string registers */
void str_set(int id, char *s);
void str_dset(int id, void *d);
char *str_get(int id);
void *str_dget(int id);
void str_rm(int id);
void str_rn(int src, int dst);
/* saving and restoring registers before and after printing diverted lines */
void odiv_beg(void);
void odiv_end(void);
/* enviroments */
void env_init(void);
void env_done(void);
struct adj *env_adj(void);
char *env_hc(void);
char *env_mc(void);
char *env_tc(void);
char *env_lc(void);
int tab_next(int pos);
int tab_type(int pos);
/* device related variables */
extern int dev_res;
extern int dev_uwid;
extern int dev_hor;
extern int dev_ver;
struct glyph {
char id[GNLEN]; /* device-dependent glyph identifier */
char name[GNLEN]; /* the first character mapped to this glyph */
struct font *font; /* glyph font */
int wid; /* character width */
int type; /* character type; ascender/descender */
int llx, lly, urx, ury; /* character bounding box */
};
struct font {
char name[FNLEN];
char fontname[FNLEN];
struct glyph glyphs[NGLYPHS];
int nglyphs;
int spacewid;
int special;
int cs, bd; /* for .cs and .bd requests */
/* charset section characters */
char c[NGLYPHS][GNLEN]; /* character names in charset */
struct glyph *g[NGLYPHS]; /* character glyphs in charset */
struct glyph *g_map[NGLYPHS]; /* character remapped via font_map() */
int n; /* number of characters in charset */
/* glyph table based on the first character of their id fields in glyphs[] */
int ghead[256]; /* glyph list heads */
int gnext[NGLYPHS]; /* next item in glyph lists */
/* character table based on the first character of glyph names in c[] */
int chead[256]; /* character list heads */
int cnext[NGLYPHS]; /* next item in character lists */
/* font ligatures (lg*) */
char lg[NLIGS][LIGLEN * GNLEN]; /* ligatures */
int lgn; /* number of ligatures in lg[] */
/* kerning pair table per glyph (kn*) */
int knhead[NGLYPHS]; /* kerning pairs of glyphs[] */
int knnext[NKERNS]; /* next item in knhead[] list */
int knpair[NKERNS]; /* kerning pair 2nd glyphs */
int knval[NKERNS]; /* font pairwise kerning value */
int knn; /* number of kerning pairs */
};
/* output device functions */
int dev_open(char *dir, char *dev);
void dev_close(void);
int dev_mnt(int pos, char *id, char *name);
int dev_pos(char *id);
struct font *dev_font(int pos);
int dev_fontpos(struct font *fn);
void dev_setcs(int fn, int cs);
int dev_getcs(int fn);
void dev_setbd(int fn, int bd);
int dev_getbd(int fn);
/* font-related functions */
struct font *font_open(char *path);
void font_close(struct font *fn);
struct glyph *font_glyph(struct font *fn, char *id);
struct glyph *font_find(struct font *fn, char *name);
int font_lig(struct font *fn, char **c, int n);
int font_kern(struct font *fn, char *c1, char *c2);
int font_islig(struct font *fn, char *s);
int font_map(struct font *fn, char *name, struct glyph *gl);
int font_mapped(struct font *fn, char *name);
/* glyph handling functions */
struct glyph *dev_glyph(char *c, int fn);
int charwid(int fn, int sz, int wid);
int spacewid(int fn, int sz);
/* convert wid in device unitwidth size to size sz */
#define DEVWID(sz, wid) (((wid) * (sz) + (dev_uwid / 2)) / dev_uwid)
/* different layers of neatroff */
int in_next(void); /* input layer */
int cp_next(void); /* copy-mode layer */
int tr_next(void); /* troff layer */
void in_push(char *s, char **args);
void in_pushnl(char *s, char **args);
void in_so(char *path); /* .so request */
void in_nx(char *path); /* .nx request */
void in_ex(void); /* .ex request */
void in_lf(char *path, int ln); /* .lf request */
void in_queue(char *path); /* queue the given input file */
char *in_arg(int i); /* look up argument */
int in_nargs(void); /* number of arguments */
void in_back(int c); /* push back input character */
int in_top(void); /* the first pushed-back character */
char *in_filename(void); /* current filename */
int in_lnum(void); /* current line number */
void cp_blk(int skip); /* skip or read the next line or block */
void cp_wid(int enable); /* control inlining \w requests */
#define cp_back in_back /* cp.c is stateless */
void tr_first(void); /* read until the first non-command line */
/* variable length string buffer */
struct sbuf {
char *s; /* allocated buffer */
int sz; /* buffer size */
int n; /* length of the string stored in s */
};
void sbuf_init(struct sbuf *sbuf);
void sbuf_done(struct sbuf *sbuf);
char *sbuf_buf(struct sbuf *sbuf);
void sbuf_add(struct sbuf *sbuf, int c);
void sbuf_append(struct sbuf *sbuf, char *s);
void sbuf_printf(struct sbuf *sbuf, char *s, ...);
void sbuf_putnl(struct sbuf *sbuf);
void sbuf_cut(struct sbuf *sbuf, int n);
int sbuf_len(struct sbuf *sbuf);
int sbuf_empty(struct sbuf *sbuf);
/* word buffer */
struct wb {
struct sbuf sbuf;
int f, s, m; /* the last output font and size */
int r_f, r_s, r_m; /* current font and size; use n_f and n_s if -1 */
int part; /* partial input (\c) */
int els_neg, els_pos; /* extra line spacing */
int h, v; /* buffer vertical and horizontal positions */
int ct, sb, st; /* \w registers */
int llx, lly, urx, ury; /* bounding box */
int icleft_ll; /* len after the pending left italic correction */
/* saving previous characters added via wb_put() */
char prev_c[LIGLEN][GNLEN];
int prev_l[LIGLEN]; /* sbuf_len(&wb->sbuf) before wb_put() calls */
int prev_h[LIGLEN]; /* wb->h before wb_put() calls */
int prev_n; /* number of characters in prev_c[] */
int prev_ll; /* sbuf_len(&wb->sbuf) after the last wb_put() */
};
void wb_init(struct wb *wb);
void wb_done(struct wb *wb);
void wb_hmov(struct wb *wb, int n);
void wb_vmov(struct wb *wb, int n);
void wb_els(struct wb *wb, int els);
void wb_etc(struct wb *wb, char *x);
void wb_put(struct wb *wb, char *c);
void wb_putexpand(struct wb *wb, char *c);
int wb_part(struct wb *wb);
void wb_setpart(struct wb *wb);
void wb_drawl(struct wb *wb, int c, int h, int v);
void wb_drawc(struct wb *wb, int c, int r);
void wb_drawe(struct wb *wb, int c, int h, int v);
void wb_drawa(struct wb *wb, int c, int h1, int v1, int h2, int v2);
void wb_drawxbeg(struct wb *wb, int c);
void wb_drawxdot(struct wb *wb, int h, int v);
void wb_drawxend(struct wb *wb);
void wb_italiccorrection(struct wb *wb);
void wb_italiccorrectionleft(struct wb *wb);
void wb_cat(struct wb *wb, struct wb *src);
int wb_hyph(struct wb *wb, int w, struct wb *w1, struct wb *w2, int flg);
int wb_wid(struct wb *wb);
int wb_empty(struct wb *wb);
int wb_eos(struct wb *wb);
void wb_wconf(struct wb *wb, int *ct, int *st, int *sb,
int *llx, int *lly, int *urx, int *ury);
int wb_lig(struct wb *wb, char *c);
int wb_kern(struct wb *wb, char *c);
/* character translation (.tr) */
void cmap_add(char *c1, char *c2);
char *cmap_map(char *c);
/* character definition (.char) */
char *cdef_map(char *c, int fn);
int cdef_expand(struct wb *wb, char *c, int fn);
/* hyphenation flags */
#define HY_MASK 0x0f /* enable hyphenation */
#define HY_LAST 0x02 /* do not hyphenate last lines */
#define HY_FINAL2 0x04 /* do not hyphenate the final two characters */
#define HY_FIRST2 0x08 /* do not hyphenate the first two characters */
#define HY_ANY 0x10 /* break at any possible position */
void hyphenate(char *hyphs, char *word, int flg);
/* adjustment */
#define AD_L 0
#define AD_B 1
#define AD_C 3
#define AD_R 5
struct adj *adj_alloc(void);
void adj_free(struct adj *adj);
int adj_fill(struct adj *adj, int ad_b, int fill, int hyph, struct sbuf *dst,
int *ll, int *in, int *ti, int *els_neg, int *els_pos);
int adj_full(struct adj *adj, int fill);
int adj_empty(struct adj *adj, int fill);
int adj_wid(struct adj *adj);
void adj_swid(struct adj *adj, int swid);
void adj_ll(struct adj *adj, int ll);
void adj_in(struct adj *adj, int in);
void adj_ti(struct adj *adj, int ti);
void adj_wb(struct adj *adj, struct wb *wb);
void adj_nl(struct adj *adj);
void adj_sp(struct adj *adj);
void adj_nonl(struct adj *adj);
/* rendering */
int render(void); /* the main loop */
int ren_parse(struct wb *wb, char *c);
int ren_char(struct wb *wb, int (*next)(void), void (*back)(int));
int ren_wid(int (*next)(void), void (*back)(int));
void ren_tl(int (*next)(void), void (*back)(int));
void ren_hline(struct wb *wb, int l, char *c); /* horizontal line */
void ren_hlcmd(struct wb *wb, char *arg); /* \l */
void ren_vlcmd(struct wb *wb, char *arg); /* \L */
void ren_bcmd(struct wb *wb, char *arg); /* \b */
void ren_ocmd(struct wb *wb, char *arg); /* \o */
void ren_dcmd(struct wb *wb, char *arg); /* \D */
/* out.c */
void out_line(char *s); /* output rendered line */
void out(char *s, ...); /* output troff cmd */
/* troff commands */
void tr_ab(char **args);
void tr_bp(char **args);
void tr_br(char **args);
void tr_ce(char **args);
void tr_ch(char **args);
void tr_cl(char **args);
void tr_di(char **args);
void tr_divbeg(char **args);
void tr_divend(char **args);
void tr_dt(char **args);
void tr_em(char **args);
void tr_ev(char **args);
void tr_fc(char **args);
void tr_fi(char **args);
void tr_fp(char **args);
void tr_fspecial(char **args);
void tr_ft(char **args);
void tr_hw(char **args);
void tr_in(char **args);
void tr_ll(char **args);
void tr_mk(char **args);
void tr_ne(char **args);
void tr_nf(char **args);
void tr_ns(char **args);
void tr_os(char **args);
void tr_pn(char **args);
void tr_ps(char **args);
void tr_rs(char **args);
void tr_rt(char **args);
void tr_sp(char **args);
void tr_sv(char **args);
void tr_ta(char **args);
void tr_ti(char **args);
void tr_wh(char **args);
void tr_eject(char **args);
void tr_init(void);
/* helpers */
void errmsg(char *msg, ...);
void errdie(char *msg);
int utf8len(int c);
int utf8next(char *s, int (*next)(void));
int utf8read(char **s, char *d);
int utf8one(char *s);
int charnext(char *c, int (*next)(void), void (*back)(int));
int charread(char **s, char *c);
int charnext_delim(char *c, int (*next)(void), void (*back)(int), char *delim);
void charnext_str(char *d, char *c);
void argnext(char *d, int cmd, int (*next)(void), void (*back)(int));
void argread(char **sp, char *d, int cmd);
int escread(char **s, char *d);
/* string streams; nested next()/back() interface for string buffers */
void sstr_push(char *s);
char *sstr_pop(void);
int sstr_next(void);
void sstr_back(int c);
/* internal commands */
#define TR_DIVBEG "\07<" /* diversion begins */
#define TR_DIVEND "\07>" /* diversion ends */
#define TR_EJECT "\07P" /* page eject */
/* mapping register, macro and environment names to indices */
#define NREGS 4096 /* maximum number of mapped names */
#define DOTMAP(c2) (c2) /* optimized mapping for ".x" names */
int map(char *s); /* map name s to an index */
char *map_name(int id); /* return the name mapped to id */
/* colors */
#define CLR_R(c) (((c) >> 16) & 0xff)
#define CLR_G(c) (((c) >> 8) & 0xff)
#define CLR_B(c) ((c) & 0xff)
#define CLR_RGB(r, g, b) (((r) << 16) | ((g) << 8) | (b))
char *clr_str(int c);
int clr_get(char *s);
/* builtin number registers; n_X for .X register */
#define n_a (*nreg(DOTMAP('a')))
#define n_cp (*nreg(DOTMAP('C')))
#define n_d (*nreg(DOTMAP('d')))
#define n_f (*nreg(DOTMAP('f')))
#define n_h (*nreg(DOTMAP('h')))
#define n_i (*nreg(DOTMAP('i')))
#define n_it (*nreg(map(".it"))) /* .it trap macro */
#define n_itn (*nreg(map(".itn"))) /* .it lines left */
#define n_j (*nreg(DOTMAP('j')))
#define n_l (*nreg(DOTMAP('l')))
#define n_L (*nreg(DOTMAP('L')))
#define n_n (*nreg(DOTMAP('n')))
#define n_nI (*nreg(map(".nI"))) /* i for .nm */
#define n_nm (*nreg(map(".nm"))) /* .nm enabled */
#define n_nM (*nreg(map(".nM"))) /* m for .nm */
#define n_nn (*nreg(map(".nn"))) /* remaining .nn */
#define n_nS (*nreg(map(".nS"))) /* s for .nm */
#define n_m (*nreg(DOTMAP('m')))
#define n_mc (*nreg(map(".mc"))) /* .mc enabled */
#define n_mcn (*nreg(map(".mcn"))) /* .mc distance */
#define n_o (*nreg(DOTMAP('o')))
#define n_p (*nreg(DOTMAP('p')))
#define n_s (*nreg(DOTMAP('s')))
#define n_u (*nreg(DOTMAP('u')))
#define n_v (*nreg(DOTMAP('v')))
#define n_ct (*nreg(map("ct")))
#define n_dl (*nreg(map("dl")))
#define n_dn (*nreg(map("dn")))
#define n_ln (*nreg(map("ln")))
#define n_nl (*nreg(map("nl")))
#define n_sb (*nreg(map("sb")))
#define n_st (*nreg(map("st")))
#define n_pg (*nreg(map("%"))) /* % */
#define n_lb (*nreg(map(".b0"))) /* input line beg */
#define n_ce (*nreg(map(".ce"))) /* .ce remaining */
#define n_f0 (*nreg(map(".f0"))) /* last .f */
#define n_lg (*nreg(map(".lg"))) /* .lg mode */
#define n_hy (*nreg(map(".hy"))) /* .hy mode */
#define n_i0 (*nreg(map(".i0"))) /* last .i */
#define n_kn (*nreg(map(".kern"))) /* .kn mode */
#define n_l0 (*nreg(map(".l0"))) /* last .l */
#define n_L0 (*nreg(map(".L0"))) /* last .L */
#define n_m0 (*nreg(map(".m0"))) /* last .m */
#define n_mk (*nreg(map(".mk"))) /* .mk internal register */
#define n_na (*nreg(map(".na"))) /* .na mode */
#define n_ns (*nreg(map(".ns"))) /* .ns mode */
#define n_o0 (*nreg(map(".o0"))) /* last .o */
#define n_ss (*nreg(map(".ss"))) /* .ss value */
#define n_s0 (*nreg(map(".s0"))) /* last .s */
#define n_sv (*nreg(map(".sv"))) /* .sv value */
#define n_lt (*nreg(map(".lt"))) /* .lt value */
#define n_t0 (*nreg(map(".lt0"))) /* previous .lt value */
#define n_v0 (*nreg(map(".v0"))) /* last .v */
#define n_llx (*nreg(map("bbllx"))) /* \w bounding box */
#define n_lly (*nreg(map("bblly"))) /* \w bounding box */
#define n_urx (*nreg(map("bburx"))) /* \w bounding box */
#define n_ury (*nreg(map("bbury"))) /* \w bounding box */
/* functions for implementing read-only registers */
int f_nexttrap(void); /* .t */
int f_divreg(void); /* .z */
int f_hpos(void); /* .k */