/* $OpenBSD: term.c,v 1.122 2017/06/02 19:21:03 schwarze Exp $ */ /* * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons * Copyright (c) 2010-2017 Ingo Schwarze * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include "mandoc.h" #include "mandoc_aux.h" #include "out.h" #include "term.h" #include "main.h" static size_t cond_width(const struct termp *, int, int *); static void adjbuf(struct termp *p, size_t); static void bufferc(struct termp *, char); static void encode(struct termp *, const char *, size_t); static void encode1(struct termp *, int); void term_free(struct termp *p) { free(p->buf); free(p->fontq); free(p); } void term_begin(struct termp *p, term_margin head, term_margin foot, const struct roff_meta *arg) { p->headf = head; p->footf = foot; p->argf = arg; (*p->begin)(p); } void term_end(struct termp *p) { (*p->end)(p); } /* * Flush a chunk of text. By default, break the output line each time * the right margin is reached, and continue output on the next line * at the same offset as the chunk itself. By default, also break the * output line at the end of the chunk. * The following flags may be specified: * * - TERMP_NOBREAK: Do not break the output line at the right margin, * but only at the max right margin. Also, do not break the output * line at the end of the chunk, such that the next call can pad to * the next column. However, if less than p->trailspace blanks, * which can be 0, 1, or 2, remain to the right margin, the line * will be broken. * - TERMP_BRTRSP: Consider trailing whitespace significant * when deciding whether the chunk fits or not. * - TERMP_BRIND: If the chunk does not fit and the output line has * to be broken, start the next line at the right margin instead * of at the offset. Used together with TERMP_NOBREAK for the tags * in various kinds of tagged lists. * - TERMP_DANGLE: Do not break the output line at the right margin, * append the next chunk after it even if this one is too long. * To be used together with TERMP_NOBREAK. * - TERMP_HANG: Like TERMP_DANGLE, and also suppress padding before * the next chunk if this column is not full. */ void term_flushln(struct termp *p) { size_t i; /* current input position in p->buf */ int ntab; /* number of tabs to prepend */ size_t vis; /* current visual position on output */ size_t vbl; /* number of blanks to prepend to output */ size_t vend; /* end of word visual position on output */ size_t bp; /* visual right border position */ size_t dv; /* temporary for visual pos calculations */ size_t j; /* temporary loop index for p->buf */ size_t jhy; /* last hyph before overflow w/r/t j */ size_t maxvis; /* output position of visible boundary */ /* * First, establish the maximum columns of "visible" content. * This is usually the difference between the right-margin and * an indentation, but can be, for tagged lists or columns, a * small set of values. * * The following unsigned-signed subtractions look strange, * but they are actually correct. If the int p->overstep * is negative, it gets sign extended. Subtracting that * very large size_t effectively adds a small number to dv. */ dv = p->rmargin > p->offset ? p->rmargin - p->offset : 0; maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0; if (p->flags & TERMP_NOBREAK) { dv = p->maxrmargin > p->offset ? p->maxrmargin - p->offset : 0; bp = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0; } else bp = maxvis; /* * Calculate the required amount of padding. */ vbl = p->offset + p->overstep > p->viscol ? p->offset + p->overstep - p->viscol : 0; vis = vend = 0; i = 0; while (i < p->col) { /* * Handle literal tab characters: collapse all * subsequent tabs into a single huge set of spaces. */ ntab = 0; while (i < p->col && p->buf[i] == '\t') { vend = term_tab_next(vis); vbl += vend - vis; vis = vend; ntab++; i++; } /* * Count up visible word characters. Control sequences * (starting with the CSI) aren't counted. A space * generates a non-printing word, which is valid (the * space is printed according to regular spacing rules). */ for (j = i, jhy = 0; j < p->col; j++) { if (' ' == p->buf[j] || '\t' == p->buf[j]) break; /* Back over the last printed character. */ if (8 == p->buf[j]) { assert(j); vend -= (*p->width)(p, p->buf[j - 1]); continue; } /* Regular word. */ /* Break at the hyphen point if we overrun. */ if (vend > vis && vend < bp && (ASCII_HYPH == p->buf[j] || ASCII_BREAK == p->buf[j])) jhy = j; /* * Hyphenation now decided, put back a real * hyphen such that we get the correct width. */ if (ASCII_HYPH == p->buf[j]) p->buf[j] = '-'; vend += (*p->width)(p, p->buf[j]); } /* * Find out whether we would exceed the right margin. * If so, break to the next line. */ if (vend > bp && 0 == jhy && vis > 0) { vend -= vis; (*p->endline)(p); p->viscol = 0; /* Use pending tabs on the new line. */ vbl = 0; while (ntab--) vbl = term_tab_next(vbl); /* Re-establish indentation. */ if (p->flags & TERMP_BRIND) { vbl += p->rmargin; vend += p->rmargin - p->offset; } else vbl += p->offset; /* * Remove the p->overstep width. * Again, if p->overstep is negative, * sign extension does the right thing. */ bp += (size_t)p->overstep; p->overstep = 0; } /* Write out the [remaining] word. */ for ( ; i < p->col; i++) { if (vend > bp && jhy > 0 && i > jhy) break; if ('\t' == p->buf[i]) break; if (' ' == p->buf[i]) { j = i; while (i < p->col && ' ' == p->buf[i]) i++; dv = (i - j) * (*p->width)(p, ' '); vbl += dv; vend += dv; break; } if (ASCII_NBRSP == p->buf[i]) { vbl += (*p->width)(p, ' '); continue; } if (ASCII_BREAK == p->buf[i]) continue; /* * Now we definitely know there will be * printable characters to output, * so write preceding white space now. */ if (vbl) { (*p->advance)(p, vbl); p->viscol += vbl; vbl = 0; } (*p->letter)(p, p->buf[i]); if (8 == p->buf[i]) p->viscol -= (*p->width)(p, p->buf[i-1]); else p->viscol += (*p->width)(p, p->buf[i]); } vis = vend; } /* * If there was trailing white space, it was not printed; * so reset the cursor position accordingly. */ if (vis > vbl) vis -= vbl; else vis = 0; p->col = 0; p->overstep = 0; p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE); if ( ! (TERMP_NOBREAK & p->flags)) { p->viscol = 0; (*p->endline)(p); return; } if (TERMP_HANG & p->flags) { p->overstep += (int)(p->offset + vis - p->rmargin + p->trailspace * (*p->width)(p, ' ')); /* * If we have overstepped the margin, temporarily move * it to the right and flag the rest of the line to be * shorter. * If there is a request to keep the columns together, * allow negative overstep when the column is not full. */ if (p->trailspace && p->overstep < 0) p->overstep = 0; return; } else if (TERMP_DANGLE & p->flags) return; /* Trailing whitespace is significant in some columns. */ if (vis && vbl && (TERMP_BRTRSP & p->flags)) vis += vbl; /* If the column was overrun, break the line. */ if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) { (*p->endline)(p); p->viscol = 0; } } /* * A newline only breaks an existing line; it won't assert vertical * space. All data in the output buffer is flushed prior to the newline * assertion. */ void term_newln(struct termp *p) { p->flags |= TERMP_NOSPACE; if (p->col || p->viscol) term_flushln(p); } /* * Asserts a vertical space (a full, empty line-break between lines). * Note that if used twice, this will cause two blank spaces and so on. * All data in the output buffer is flushed prior to the newline * assertion. */ void term_vspace(struct termp *p) { term_newln(p); p->viscol = 0; if (0 < p->skipvsp) p->skipvsp--; else (*p->endline)(p); } /* Swap current and previous font; for \fP and .ft P */ void term_fontlast(struct termp *p) { enum termfont f; f = p->fontl; p->fontl = p->fontq[p->fonti]; p->fontq[p->fonti] = f; } /* Set font, save current, discard previous; for \f, .ft, .B etc. */ void term_fontrepl(struct termp *p, enum termfont f) { p->fontl = p->fontq[p->fonti]; p->fontq[p->fonti] = f; } /* Set font, save previous. */ void term_fontpush(struct termp *p, enum termfont f) { p->fontl = p->fontq[p->fonti]; if (++p->fonti == p->fontsz) { p->fontsz += 8; p->fontq = mandoc_reallocarray(p->fontq, p->fontsz, sizeof(*p->fontq)); } p->fontq[p->fonti] = f; } /* Flush to make the saved pointer current again. */ void term_fontpopq(struct termp *p, int i) { assert(i >= 0); if (p->fonti > i) p->fonti = i; } /* Pop one font off the stack. */ void term_fontpop(struct termp *p) { assert(p->fonti); p->fonti--; } /* * Handle pwords, partial words, which may be either a single word or a * phrase that cannot be broken down (such as a literal string). This * handles word styling. */ void term_word(struct termp *p, const char *word) { struct roffsu su; const char nbrsp[2] = { ASCII_NBRSP, 0 }; const char *seq, *cp; int sz, uc; size_t csz, lsz, ssz; enum mandoc_esc esc; if ( ! (TERMP_NOSPACE & p->flags)) { if ( ! (TERMP_KEEP & p->flags)) { bufferc(p, ' '); if (TERMP_SENTENCE & p->flags) bufferc(p, ' '); } else bufferc(p, ASCII_NBRSP); } if (TERMP_PREKEEP & p->flags) p->flags |= TERMP_KEEP; if ( ! (p->flags & TERMP_NONOSPACE)) p->flags &= ~TERMP_NOSPACE; else p->flags |= TERMP_NOSPACE; p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE); p->skipvsp = 0; while ('\0' != *word) { if ('\\' != *word) { if (TERMP_NBRWORD & p->flags) { if (' ' == *word) { encode(p, nbrsp, 1); word++; continue; } ssz = strcspn(word, "\\ "); } else ssz = strcspn(word, "\\"); encode(p, word, ssz); word += (int)ssz; continue; } word++; esc = mandoc_escape(&word, &seq, &sz); if (ESCAPE_ERROR == esc) continue; switch (esc) { case ESCAPE_UNICODE: uc = mchars_num2uc(seq + 1, sz - 1); break; case ESCAPE_NUMBERED: uc = mchars_num2char(seq, sz); if (uc < 0) continue; break; case ESCAPE_SPECIAL: if (p->enc == TERMENC_ASCII) { cp = mchars_spec2str(seq, sz, &ssz); if (cp != NULL) encode(p, cp, ssz); } else { uc = mchars_spec2cp(seq, sz); if (uc > 0) encode1(p, uc); } continue; case ESCAPE_FONTBOLD: term_fontrepl(p, TERMFONT_BOLD); continue; case ESCAPE_FONTITALIC: term_fontrepl(p, TERMFONT_UNDER); continue; case ESCAPE_FONTBI: term_fontrepl(p, TERMFONT_BI); continue; case ESCAPE_FONT: case ESCAPE_FONTROMAN: term_fontrepl(p, TERMFONT_NONE); continue; case ESCAPE_FONTPREV: term_fontlast(p); continue; case ESCAPE_NOSPACE: if (p->flags & TERMP_BACKAFTER) p->flags &= ~TERMP_BACKAFTER; else if (*word == '\0') p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE); continue; case ESCAPE_HORIZ: if (a2roffsu(seq, &su, SCALE_EM) == 0) continue; uc = term_hspan(p, &su) / 24; if (uc > 0) while (uc-- > 0) bufferc(p, ASCII_NBRSP); else if (p->col > (size_t)(-uc)) p->col += uc; else { uc += p->col; p->col = 0; if (p->offset > (size_t)(-uc)) { p->ti += uc; p->offset += uc; } else { p->ti -= p->offset; p->offset = 0; } } continue; case ESCAPE_HLINE: if (a2roffsu(seq, &su, SCALE_EM) == 0) continue; uc = term_hspan(p, &su) / 24; if (uc <= 0) { if (p->rmargin <= p->offset) continue; lsz = p->rmargin - p->offset; } else lsz = uc; while (sz && strchr(" %&()*+-./0123456789:<=>", *seq)) { seq++; sz--; } if (sz && strchr("cifMmnPpuv", *seq)) { seq++; sz--; } if (sz == 0) uc = -1; else if (*seq == '\\') { seq++; esc = mandoc_escape(&seq, &cp, &sz); switch (esc) { case ESCAPE_UNICODE: uc = mchars_num2uc(cp + 1, sz - 1); break; case ESCAPE_NUMBERED: uc = mchars_num2char(cp, sz); break; case ESCAPE_SPECIAL: uc = mchars_spec2cp(cp, sz); break; default: uc = -1; break; } } else uc = *seq; if (uc < 0x20 || (uc > 0x7E && uc < 0xA0)) uc = '_'; if (p->enc == TERMENC_ASCII) { cp = ascii_uc2str(uc); csz = term_strlen(p, cp); ssz = strlen(cp); } else csz = (*p->width)(p, uc); while (lsz >= csz) { if (p->enc == TERMENC_ASCII) encode(p, cp, ssz); else encode1(p, uc); lsz -= csz; } continue; case ESCAPE_SKIPCHAR: p->flags |= TERMP_BACKAFTER; continue; case ESCAPE_OVERSTRIKE: cp = seq + sz; while (seq < cp) { if (*seq == '\\') { mandoc_escape(&seq, NULL, NULL); continue; } encode1(p, *seq++); if (seq < cp) { if (p->flags & TERMP_BACKBEFORE) p->flags |= TERMP_BACKAFTER; else p->flags |= TERMP_BACKBEFORE; } } /* Trim trailing backspace/blank pair. */ if (p->col > 2 && (p->buf[p->col - 1] == ' ' || p->buf[p->col - 1] == '\t')) p->col -= 2; continue; default: continue; } /* * Common handling for Unicode and numbered * character escape sequences. */ if (p->enc == TERMENC_ASCII) { cp = ascii_uc2str(uc); encode(p, cp, strlen(cp)); } else { if ((uc < 0x20 && uc != 0x09) || (uc > 0x7E && uc < 0xA0)) uc = 0xFFFD; encode1(p, uc); } } p->flags &= ~TERMP_NBRWORD; } static void adjbuf(struct termp *p, size_t sz) { if (0 == p->maxcols) p->maxcols = 1024; while (sz >= p->maxcols) p->maxcols <<= 2; p->buf = mandoc_reallocarray(p->buf, p->maxcols, sizeof(int)); } static void bufferc(struct termp *p, char c) { if (p->col + 1 >= p->maxcols) adjbuf(p, p->col + 1); p->buf[p->col++] = c; } /* * See encode(). * Do this for a single (probably unicode) value. * Does not check for non-decorated glyphs. */ static void encode1(struct termp *p, int c) { enum termfont f; if (p->col + 7 >= p->maxcols) adjbuf(p, p->col + 7); f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ? p->fontq[p->fonti] : TERMFONT_NONE; if (p->flags & TERMP_BACKBEFORE) { if (p->buf[p->col - 1] == ' ' || p->buf[p->col - 1] == '\t') p->col--; else p->buf[p->col++] = 8; p->flags &= ~TERMP_BACKBEFORE; } if (TERMFONT_UNDER == f || TERMFONT_BI == f) { p->buf[p->col++] = '_'; p->buf[p->col++] = 8; } if (TERMFONT_BOLD == f || TERMFONT_BI == f) { if (ASCII_HYPH == c) p->buf[p->col++] = '-'; else p->buf[p->col++] = c; p->buf[p->col++] = 8; } p->buf[p->col++] = c; if (p->flags & TERMP_BACKAFTER) { p->flags |= TERMP_BACKBEFORE; p->flags &= ~TERMP_BACKAFTER; } } static void encode(struct termp *p, const char *word, size_t sz) { size_t i; if (p->col + 2 + (sz * 5) >= p->maxcols) adjbuf(p, p->col + 2 + (sz * 5)); for (i = 0; i < sz; i++) { if (ASCII_HYPH == word[i] || isgraph((unsigned char)word[i])) encode1(p, word[i]); else { p->buf[p->col++] = word[i]; /* * Postpone the effect of \z while handling * an overstrike sequence from ascii_uc2str(). */ if (word[i] == '\b' && (p->flags & TERMP_BACKBEFORE)) { p->flags &= ~TERMP_BACKBEFORE; p->flags |= TERMP_BACKAFTER; } } } } void term_setwidth(struct termp *p, const char *wstr) { struct roffsu su; int iop, width; iop = 0; width = 0; if (NULL != wstr) { switch (*wstr) { case '+': iop = 1; wstr++; break; case '-': iop = -1; wstr++; break; default: break; } if (a2roffsu(wstr, &su, SCALE_MAX)) width = term_hspan(p, &su); else iop = 0; } (*p->setwidth)(p, iop, width); } size_t term_len(const struct termp *p, size_t sz) { return (*p->width)(p, ' ') * sz; } static size_t cond_width(const struct termp *p, int c, int *skip) { if (*skip) { (*skip) = 0; return 0; } else return (*p->width)(p, c); } size_t term_strlen(const struct termp *p, const char *cp) { size_t sz, rsz, i; int ssz, skip, uc; const char *seq, *rhs; enum mandoc_esc esc; static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' }; /* * Account for escaped sequences within string length * calculations. This follows the logic in term_word() as we * must calculate the width of produced strings. */ sz = 0; skip = 0; while ('\0' != *cp) { rsz = strcspn(cp, rej); for (i = 0; i < rsz; i++) sz += cond_width(p, *cp++, &skip); switch (*cp) { case '\\': cp++; esc = mandoc_escape(&cp, &seq, &ssz); if (ESCAPE_ERROR == esc) continue; rhs = NULL; switch (esc) { case ESCAPE_UNICODE: uc = mchars_num2uc(seq + 1, ssz - 1); break; case ESCAPE_NUMBERED: uc = mchars_num2char(seq, ssz); if (uc < 0) continue; break; case ESCAPE_SPECIAL: if (p->enc == TERMENC_ASCII) { rhs = mchars_spec2str(seq, ssz, &rsz); if (rhs != NULL) break; } else { uc = mchars_spec2cp(seq, ssz); if (uc > 0) sz += cond_width(p, uc, &skip); } continue; case ESCAPE_SKIPCHAR: skip = 1; continue; case ESCAPE_OVERSTRIKE: rsz = 0; rhs = seq + ssz; while (seq < rhs) { if (*seq == '\\') { mandoc_escape(&seq, NULL, NULL); continue; } i = (*p->width)(p, *seq++); if (rsz < i) rsz = i; } sz += rsz; continue; default: continue; } /* * Common handling for Unicode and numbered * character escape sequences. */ if (rhs == NULL) { if (p->enc == TERMENC_ASCII) { rhs = ascii_uc2str(uc); rsz = strlen(rhs); } else { if ((uc < 0x20 && uc != 0x09) || (uc > 0x7E && uc < 0xA0)) uc = 0xFFFD; sz += cond_width(p, uc, &skip); continue; } } if (skip) { skip = 0; break; } /* * Common handling for all escape sequences * printing more than one character. */ for (i = 0; i < rsz; i++) sz += (*p->width)(p, *rhs++); break; case ASCII_NBRSP: sz += cond_width(p, ' ', &skip); cp++; break; case ASCII_HYPH: sz += cond_width(p, '-', &skip); cp++; break; default: break; } } return sz; } int term_vspan(const struct termp *p, const struct roffsu *su) { double r; int ri; switch (su->unit) { case SCALE_BU: r = su->scale / 40.0; break; case SCALE_CM: r = su->scale * 6.0 / 2.54; break; case SCALE_FS: r = su->scale * 65536.0 / 40.0; break; case SCALE_IN: r = su->scale * 6.0; break; case SCALE_MM: r = su->scale * 0.006; break; case SCALE_PC: r = su->scale; break; case SCALE_PT: r = su->scale / 12.0; break; case SCALE_EN: case SCALE_EM: r = su->scale * 0.6; break; case SCALE_VS: r = su->scale; break; default: abort(); } ri = r > 0.0 ? r + 0.4995 : r - 0.4995; return ri < 66 ? ri : 1; } /* * Convert a scaling width to basic units, rounding down. */ int term_hspan(const struct termp *p, const struct roffsu *su) { return (*p->hspan)(p, su); }