diff options
Diffstat (limited to 'usr.bin/mandoc/term.c')
| -rw-r--r-- | usr.bin/mandoc/term.c | 1112 |
1 files changed, 1112 insertions, 0 deletions
diff --git a/usr.bin/mandoc/term.c b/usr.bin/mandoc/term.c new file mode 100644 index 0000000..68f78d7 --- /dev/null +++ b/usr.bin/mandoc/term.c @@ -0,0 +1,1112 @@ +/* $OpenBSD: term.c,v 1.141 2019/06/03 20:23:39 schwarze Exp $ */ +/* + * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv> + * Copyright (c) 2010-2019 Ingo Schwarze <schwarze@openbsd.org> + * + * 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 <sys/types.h> + +#include <assert.h> +#include <ctype.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#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_col *, size_t); +static void bufferc(struct termp *, char); +static void encode(struct termp *, const char *, size_t); +static void encode1(struct termp *, int); +static void endline(struct termp *); +static void term_field(struct termp *, size_t, size_t, + size_t, size_t); +static void term_fill(struct termp *, size_t *, size_t *, + size_t); + + +void +term_setcol(struct termp *p, size_t maxtcol) +{ + if (maxtcol > p->maxtcol) { + p->tcols = mandoc_recallocarray(p->tcols, + p->maxtcol, maxtcol, sizeof(*p->tcols)); + p->maxtcol = maxtcol; + } + p->lasttcol = maxtcol - 1; + p->tcol = p->tcols; +} + +void +term_free(struct termp *p) +{ + for (p->tcol = p->tcols; p->tcol < p->tcols + p->maxtcol; p->tcol++) + free(p->tcol->buf); + free(p->tcols); + 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. There are many flags modifying + * this behaviour, see the comments in the body of the function. + */ +void +term_flushln(struct termp *p) +{ + size_t vbl; /* Number of blanks to prepend to the output. */ + size_t vbr; /* Actual visual position of the end of field. */ + size_t vfield; /* Desired visual field width. */ + size_t vtarget; /* Desired visual position of the right margin. */ + size_t ic; /* Character position in the input buffer. */ + size_t nbr; /* Number of characters to print in this field. */ + + /* + * Normally, start writing at the left margin, but with the + * NOPAD flag, start writing at the current position instead. + */ + + vbl = (p->flags & TERMP_NOPAD) || p->tcol->offset < p->viscol ? + 0 : p->tcol->offset - p->viscol; + if (p->minbl && vbl < p->minbl) + vbl = p->minbl; + + if ((p->flags & TERMP_MULTICOL) == 0) + p->tcol->col = 0; + + /* Loop over output lines. */ + + for (;;) { + vfield = p->tcol->rmargin > p->viscol + vbl ? + p->tcol->rmargin - p->viscol - vbl : 0; + + /* + * Normally, break the line at the the right margin + * of the field, but with the NOBREAK flag, only + * break it at the max right margin of the screen, + * and with the BRNEVER flag, never break it at all. + */ + + vtarget = p->flags & TERMP_BRNEVER ? SIZE_MAX : + (p->flags & TERMP_NOBREAK) == 0 ? vfield : + p->maxrmargin > p->viscol + vbl ? + p->maxrmargin - p->viscol - vbl : 0; + + /* + * Figure out how much text will fit in the field. + * If there is whitespace only, print nothing. + */ + + term_fill(p, &nbr, &vbr, vtarget); + if (nbr == 0) + break; + + /* + * With the CENTER or RIGHT flag, increase the indentation + * to center the text between the left and right margins + * or to adjust it to the right margin, respectively. + */ + + if (vbr < vtarget) { + if (p->flags & TERMP_CENTER) + vbl += (vtarget - vbr) / 2; + else if (p->flags & TERMP_RIGHT) + vbl += vtarget - vbr; + } + + /* Finally, print the field content. */ + + term_field(p, vbl, nbr, vbr, vtarget); + + /* + * If there is no text left in the field, exit the loop. + * If the BRTRSP flag is set, consider trailing + * whitespace significant when deciding whether + * the field fits or not. + */ + + for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) { + switch (p->tcol->buf[ic]) { + case '\t': + if (p->flags & TERMP_BRTRSP) + vbr = term_tab_next(vbr); + continue; + case ' ': + if (p->flags & TERMP_BRTRSP) + vbr += (*p->width)(p, ' '); + continue; + case '\n': + case ASCII_BREAK: + continue; + default: + break; + } + break; + } + if (ic == p->tcol->lastcol) + break; + + /* + * At the location of an automtic line break, input + * space characters are consumed by the line break. + */ + + while (p->tcol->col < p->tcol->lastcol && + p->tcol->buf[p->tcol->col] == ' ') + p->tcol->col++; + + /* + * In multi-column mode, leave the rest of the text + * in the buffer to be handled by a subsequent + * invocation, such that the other columns of the + * table can be handled first. + * In single-column mode, simply break the line. + */ + + if (p->flags & TERMP_MULTICOL) + return; + + endline(p); + p->viscol = 0; + + /* + * Normally, start the next line at the same indentation + * as this one, but with the BRIND flag, start it at the + * right margin instead. This is used together with + * NOBREAK for the tags in various kinds of tagged lists. + */ + + vbl = p->flags & TERMP_BRIND ? + p->tcol->rmargin : p->tcol->offset; + } + + /* Reset output state in preparation for the next field. */ + + p->col = p->tcol->col = p->tcol->lastcol = 0; + p->minbl = p->trailspace; + p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE | TERMP_NOPAD); + + if (p->flags & TERMP_MULTICOL) + return; + + /* + * The HANG flag means that the next field + * always follows on the same line. + * The NOBREAK flag means that the next field + * follows on the same line unless the field was overrun. + * Normally, break the line at the end of each field. + */ + + if ((p->flags & TERMP_HANG) == 0 && + ((p->flags & TERMP_NOBREAK) == 0 || + vbr + term_len(p, p->trailspace) > vfield)) + endline(p); +} + +/* + * Store the number of input characters to print in this field in *nbr + * and their total visual width to print in *vbr. + * If there is only whitespace in the field, both remain zero. + * The desired visual width of the field is provided by vtarget. + * If the first word is longer, the field will be overrun. + */ +static void +term_fill(struct termp *p, size_t *nbr, size_t *vbr, size_t vtarget) +{ + size_t ic; /* Character position in the input buffer. */ + size_t vis; /* Visual position of the current character. */ + size_t vn; /* Visual position of the next character. */ + int breakline; /* Break at the end of this word. */ + int graph; /* Last character was non-blank. */ + + *nbr = *vbr = vis = 0; + breakline = graph = 0; + for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) { + switch (p->tcol->buf[ic]) { + case '\b': /* Escape \o (overstrike) or backspace markup. */ + assert(ic > 0); + vis -= (*p->width)(p, p->tcol->buf[ic - 1]); + continue; + + case '\t': /* Normal ASCII whitespace. */ + case ' ': + case ASCII_BREAK: /* Escape \: (breakpoint). */ + switch (p->tcol->buf[ic]) { + case '\t': + vn = term_tab_next(vis); + break; + case ' ': + vn = vis + (*p->width)(p, ' '); + break; + case ASCII_BREAK: + vn = vis; + break; + default: + abort(); + } + /* Can break at the end of a word. */ + if (breakline || vn > vtarget) + break; + if (graph) { + *nbr = ic; + *vbr = vis; + graph = 0; + } + vis = vn; + continue; + + case '\n': /* Escape \p (break at the end of the word). */ + breakline = 1; + continue; + + case ASCII_HYPH: /* Breakable hyphen. */ + graph = 1; + /* + * We are about to decide whether to break the + * line or not, so we no longer need this hyphen + * to be marked as breakable. Put back a real + * hyphen such that we get the correct width. + */ + p->tcol->buf[ic] = '-'; + vis += (*p->width)(p, '-'); + if (vis > vtarget) { + ic++; + break; + } + *nbr = ic + 1; + *vbr = vis; + continue; + + case ASCII_NBRSP: /* Non-breakable space. */ + p->tcol->buf[ic] = ' '; + /* FALLTHROUGH */ + default: /* Printable character. */ + graph = 1; + vis += (*p->width)(p, p->tcol->buf[ic]); + if (vis > vtarget && *nbr > 0) + return; + continue; + } + break; + } + + /* + * If the last word extends to the end of the field without any + * trailing whitespace, the loop could not check yet whether it + * can remain on this line. So do the check now. + */ + + if (graph && (vis <= vtarget || *nbr == 0)) { + *nbr = ic; + *vbr = vis; + } +} + +/* + * Print the contents of one field + * with an indentation of vbl visual columns, + * an input string length of nbr characters, + * an output width of vbr visual columns, + * and a desired field width of vtarget visual columns. + */ +static void +term_field(struct termp *p, size_t vbl, size_t nbr, size_t vbr, size_t vtarget) +{ + size_t ic; /* Character position in the input buffer. */ + size_t vis; /* Visual position of the current character. */ + size_t dv; /* Visual width of the current character. */ + size_t vn; /* Visual position of the next character. */ + + vis = 0; + for (ic = p->tcol->col; ic < nbr; ic++) { + + /* + * To avoid the printing of trailing whitespace, + * do not print whitespace right away, only count it. + */ + + switch (p->tcol->buf[ic]) { + case '\n': + case ASCII_BREAK: + continue; + case '\t': + vn = term_tab_next(vis); + vbl += vn - vis; + vis = vn; + continue; + case ' ': + case ASCII_NBRSP: + dv = (*p->width)(p, ' '); + vbl += dv; + vis += dv; + continue; + default: + break; + } + + /* + * We found a non-blank character to print, + * so write preceding white space now. + */ + + if (vbl > 0) { + (*p->advance)(p, vbl); + p->viscol += vbl; + vbl = 0; + } + + /* Print the character and adjust the visual position. */ + + (*p->letter)(p, p->tcol->buf[ic]); + if (p->tcol->buf[ic] == '\b') { + dv = (*p->width)(p, p->tcol->buf[ic - 1]); + p->viscol -= dv; + vis -= dv; + } else { + dv = (*p->width)(p, p->tcol->buf[ic]); + p->viscol += dv; + vis += dv; + } + } + p->tcol->col = nbr; +} + +static void +endline(struct termp *p) +{ + if ((p->flags & (TERMP_NEWMC | TERMP_ENDMC)) == TERMP_ENDMC) { + p->mc = NULL; + p->flags &= ~TERMP_ENDMC; + } + if (p->mc != NULL) { + if (p->viscol && p->maxrmargin >= p->viscol) + (*p->advance)(p, p->maxrmargin - p->viscol + 1); + p->flags |= TERMP_NOBUF | TERMP_NOSPACE; + term_word(p, p->mc); + p->flags &= ~(TERMP_NOBUF | TERMP_NEWMC); + } + p->viscol = 0; + p->minbl = 0; + (*p->endline)(p); +} + +/* + * 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->tcol->lastcol || 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; + p->minbl = 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 ((p->flags & TERMP_NOBUF) == 0) { + if ((p->flags & TERMP_NOSPACE) == 0) { + if ((p->flags & TERMP_KEEP) == 0) { + bufferc(p, ' '); + if (p->flags & TERMP_SENTENCE) + bufferc(p, ' '); + } else + bufferc(p, ASCII_NBRSP); + } + if (p->flags & TERMP_PREKEEP) + 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); + 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_UNDEF: + uc = *seq; + break; + 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_FONTCW: + case ESCAPE_FONTROMAN: + term_fontrepl(p, TERMFONT_NONE); + continue; + case ESCAPE_FONTPREV: + term_fontlast(p); + continue; + case ESCAPE_BREAK: + bufferc(p, '\n'); + 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_DEVICE: + if (p->type == TERMTYPE_PDF) + encode(p, "pdf", 3); + else if (p->type == TERMTYPE_PS) + encode(p, "ps", 2); + else if (p->enc == TERMENC_ASCII) + encode(p, "ascii", 5); + else + encode(p, "utf8", 4); + continue; + case ESCAPE_HORIZ: + if (*seq == '|') { + seq++; + uc = -p->col; + } else + uc = 0; + if (a2roffsu(seq, &su, SCALE_EM) == NULL) + continue; + uc += term_hen(p, &su); + 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->tcol->offset > (size_t)(-uc)) { + p->ti += uc; + p->tcol->offset += uc; + } else { + p->ti -= p->tcol->offset; + p->tcol->offset = 0; + } + } + continue; + case ESCAPE_HLINE: + if ((cp = a2roffsu(seq, &su, SCALE_EM)) == NULL) + continue; + uc = term_hen(p, &su); + if (uc <= 0) { + if (p->tcol->rmargin <= p->tcol->offset) + continue; + lsz = p->tcol->rmargin - p->tcol->offset; + } else + lsz = uc; + if (*cp == seq[-1]) + uc = -1; + else if (*cp == '\\') { + seq = cp + 1; + 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; + case ESCAPE_UNDEF: + uc = *seq; + break; + default: + uc = -1; + break; + } + } else + uc = *cp; + 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->tcol->lastcol > 2 && + (p->tcol->buf[p->tcol->lastcol - 1] == ' ' || + p->tcol->buf[p->tcol->lastcol - 1] == '\t')) + p->tcol->lastcol -= 2; + if (p->col > p->tcol->lastcol) + p->col = p->tcol->lastcol; + 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_col *c, size_t sz) +{ + if (c->maxcols == 0) + c->maxcols = 1024; + while (c->maxcols <= sz) + c->maxcols <<= 2; + c->buf = mandoc_reallocarray(c->buf, c->maxcols, sizeof(*c->buf)); +} + +static void +bufferc(struct termp *p, char c) +{ + if (p->flags & TERMP_NOBUF) { + (*p->letter)(p, c); + return; + } + if (p->col + 1 >= p->tcol->maxcols) + adjbuf(p->tcol, p->col + 1); + if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP)) + p->tcol->buf[p->col] = c; + if (p->tcol->lastcol < ++p->col) + p->tcol->lastcol = p->col; +} + +/* + * 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->flags & TERMP_NOBUF) { + (*p->letter)(p, c); + return; + } + + if (p->col + 7 >= p->tcol->maxcols) + adjbuf(p->tcol, p->col + 7); + + f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ? + p->fontq[p->fonti] : TERMFONT_NONE; + + if (p->flags & TERMP_BACKBEFORE) { + if (p->tcol->buf[p->col - 1] == ' ' || + p->tcol->buf[p->col - 1] == '\t') + p->col--; + else + p->tcol->buf[p->col++] = '\b'; + p->flags &= ~TERMP_BACKBEFORE; + } + if (f == TERMFONT_UNDER || f == TERMFONT_BI) { + p->tcol->buf[p->col++] = '_'; + p->tcol->buf[p->col++] = '\b'; + } + if (f == TERMFONT_BOLD || f == TERMFONT_BI) { + if (c == ASCII_HYPH) + p->tcol->buf[p->col++] = '-'; + else + p->tcol->buf[p->col++] = c; + p->tcol->buf[p->col++] = '\b'; + } + if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP)) + p->tcol->buf[p->col] = c; + if (p->tcol->lastcol < ++p->col) + p->tcol->lastcol = p->col; + 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->flags & TERMP_NOBUF) { + for (i = 0; i < sz; i++) + (*p->letter)(p, word[i]); + return; + } + + if (p->col + 2 + (sz * 5) >= p->tcol->maxcols) + adjbuf(p->tcol, 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 { + if (p->tcol->lastcol <= p->col || + (word[i] != ' ' && word[i] != ASCII_NBRSP)) + p->tcol->buf[p->col] = word[i]; + p->col++; + + /* + * 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; + } + } + } + if (p->tcol->lastcol < p->col) + p->tcol->lastcol = p->col; +} + +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) != NULL) + 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++; + rhs = NULL; + esc = mandoc_escape(&cp, &seq, &ssz); + 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_UNDEF: + uc = *seq; + break; + case ESCAPE_DEVICE: + if (p->type == TERMTYPE_PDF) { + rhs = "pdf"; + rsz = 3; + } else if (p->type == TERMTYPE_PS) { + rhs = "ps"; + rsz = 2; + } else if (p->enc == TERMENC_ASCII) { + rhs = "ascii"; + rsz = 5; + } else { + rhs = "utf8"; + rsz = 4; + } + break; + 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 towards 0. + */ +int +term_hspan(const struct termp *p, const struct roffsu *su) +{ + + return (*p->hspan)(p, su); +} + +/* + * Convert a scaling width to basic units, rounding to closest. + */ +int +term_hen(const struct termp *p, const struct roffsu *su) +{ + int bu; + + if ((bu = (*p->hspan)(p, su)) >= 0) + return (bu + 11) / 24; + else + return -((-bu + 11) / 24); +} |