While I'm rooting around, note that we depend on sqlite3 now, not berkeley.

[mandoc.git] / term.c

diff --git a/term.c b/term.c
index 3fb9b878fa88585b0d769753d8f6c685e3d4aee0..a10fce7a2dbf9a6e3d98cdacf7fcac80da456e4f 100644 (file)
--- a/term.c
+++ b/term.c
@@ -1,466 +1,779 @@
-/* $Id: term.c,v 1.5 2009/02/21 19:05:28 kristaps Exp $ */
+/*     $Id: term.c,v 1.203 2012/05/31 22:29:13 schwarze Exp $ */

 /*
 /*

- * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
+ * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2010, 2011, 2012 Ingo Schwarze <schwarze@openbsd.org>

  *
  * Permission to use, copy, modify, and distribute this software for any
  *
  * 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.
+ * 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 AUTHOR DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
- * AUTHOR 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.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.

  */
  */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+

 #include <assert.h>
 #include <ctype.h>
 #include <assert.h>
 #include <ctype.h>

-#include <err.h>
-#include <stdlib.h>
+#include <stdint.h>

 #include <stdio.h>
 #include <stdio.h>

+#include <stdlib.h>

 #include <string.h>
 #include <string.h>

-#include <unistd.h>

 
 

+#include "mandoc.h"
+#include "out.h"

 #include "term.h"
 #include "term.h"

-#include "private.h" /* XXX */
+#include "main.h"

 
 

-enum   termstyle {
-       STYLE_CLEAR,
-       STYLE_BOLD,
-       STYLE_UNDERLINE
-};
+static size_t           cond_width(const struct termp *, int, int *);
+static void             adjbuf(struct termp *p, int);
+static void             bufferc(struct termp *, char);
+static void             encode(struct termp *, const char *, size_t);
+static void             encode1(struct termp *, int);

 
 

-static void              termprint_r(struct termp *,
-                               const struct mdoc_meta *,
-                               const struct mdoc_node *);
-static void              termprint_header(struct termp *,
-                               const struct mdoc_meta *);
-static void              termprint_footer(struct termp *,
-                               const struct mdoc_meta *);
+void
+term_free(struct termp *p)
+{

 
 

-static void              pword(struct termp *, const char *, size_t);
-static void              chara(struct termp *, char);
-static void              escape(struct termp *, enum termstyle);
+       if (p->buf)
+               free(p->buf);
+       if (p->symtab)
+               mchars_free(p->symtab);

 
 

+       free(p);
+}
+
+
+void
+term_begin(struct termp *p, term_margin head, 
+               term_margin foot, const void *arg)
+{
+
+       p->headf = head;
+       p->footf = foot;
+       p->argf = arg;
+       (*p->begin)(p);
+}

 
 

+
+void
+term_end(struct termp *p)
+{
+
+       (*p->end)(p);
+}
+
+/*
+ * Flush a line of text.  A "line" is loosely defined as being something
+ * that should be followed by a newline, regardless of whether it's
+ * broken apart by newlines getting there.  A line can also be a
+ * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
+ * not have a trailing newline.
+ *
+ * The following flags may be specified:
+ *
+ *  - TERMP_NOBREAK: this is the most important and is used when making
+ *    columns.  In short: don't print a newline and instead expect the
+ *    next call to do the padding up to the start of the next column.
+ *
+ *  - TERMP_TWOSPACE: make sure there is room for at least two space
+ *    characters of padding.  Otherwise, rather break the line.
+ *
+ *  - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
+ *    the line is overrun, and don't pad-right if it's underrun.
+ *
+ *  - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
+ *    overrunning, instead save the position and continue at that point
+ *    when the next invocation.
+ *
+ *  In-line line breaking:
+ *
+ *  If TERMP_NOBREAK is specified and the line overruns the right
+ *  margin, it will break and pad-right to the right margin after
+ *  writing.  If maxrmargin is violated, it will break and continue
+ *  writing from the right-margin, which will lead to the above scenario
+ *  upon exit.  Otherwise, the line will break at the right margin.
+ */

 void
 void

-flushln(struct termp *p)
+term_flushln(struct termp *p)

 {
 {

-       size_t           i, j, vsz, vis, maxvis;
+       int              i;     /* current input position in p->buf */
+       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 */
+       int              j;     /* temporary loop index for p->buf */
+       int              jhy;   /* last hyph before overflow w/r/t j */
+       size_t           maxvis; /* output position of visible boundary */
+       size_t           mmax; /* used in calculating bp */

 
        /*
         * 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
 
        /*
         * 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.
+        * small set of values. 

         */
         */

+       assert  (p->rmargin >= p->offset);
+       dv     = p->rmargin - p->offset;
+       maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
+       dv     = p->maxrmargin - p->offset;
+       mmax   = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;

 
 

-       assert(p->offset < p->rmargin);
-       maxvis = p->rmargin - p->offset;
-       vis = 0;
+       bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;

 
        /*
 
        /*

-        * If in the standard case (left-justified), then begin with our
-        * indentation, otherwise (columns, etc.) just start spitting
-        * out text.
+        * 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;

 
 

-       if ( ! (p->flags & TERMP_NOLPAD))
-               /* LINTED */
-               for (j = 0; j < p->offset; j++)
-                       putchar(' ');
+       while (i < p->col) {
+               /*
+                * Handle literal tab characters: collapse all
+                * subsequent tabs into a single huge set of spaces.
+                */
+               while (i < p->col && '\t' == p->buf[i]) {
+                       vend = (vis / p->tabwidth + 1) * p->tabwidth;
+                       vbl += vend - vis;
+                       vis = vend;
+                       i++;
+               }

 
 

-       for (i = 0; i < p->col; i++) {

                /*
                 * Count up visible word characters.  Control sequences
                /*
                 * Count up visible word characters.  Control sequences

-                * (starting with the CSI) aren't counted. 
+                * (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).

                 */
                 */

-               assert( ! isspace(p->buf[i]));

 
 

-               /* LINTED */
-               for (j = i, vsz = 0; j < p->col; j++) {
-                       if (isspace(p->buf[j]))
+               for (j = i, jhy = 0; j < p->col; j++) {
+                       if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])

                                break;
                                break;

-                       else if (27 == p->buf[j]) {
-                               assert(j + 4 <= p->col);
-                               j += 3;
-                       } else
-                               vsz++;
+
+                       /* Back over the 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])
+                               jhy = j;
+
+                       vend += (*p->width)(p, p->buf[j]);

                }
                }

-               assert(vsz > 0);

 
                /*
 
                /*

-                * If a word is too long and we're within a line, put it
-                * on the next line.  Puke if we're being asked to write
-                * something that will exceed the right margin (i.e.,
-                * from a fresh line or when we're not allowed to break
-                * the line with TERMP_NOBREAK).
+                * 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;
+                       if (TERMP_NOBREAK & p->flags) {
+                               vbl = p->rmargin;
+                               vend += p->rmargin - p->offset;
+                       } else
+                               vbl = p->offset;

 
 

-               if (vis && vis + vsz >= maxvis) {
-                       /* FIXME */
-                       if (p->flags & TERMP_NOBREAK)
-                               errx(1, "word breaks right margin");
-                       putchar('\n');
-                       for (j = 0; j < p->offset; j++)
-                               putchar(' ');
-                       vis = 0;
-               } else if (vis + vsz >= maxvis) {
-                       /* FIXME */
-                       errx(1, "word breaks right margin");
-               }
+                       /* Remove the p->overstep width. */

 
 

-               /* 
-                * Write out the word and a trailing space.  Omit the
-                * space if we're the last word in the line.
-                */
+                       bp += (size_t)p->overstep;
+                       p->overstep = 0;
+               }

 
 

+               /* Write out the [remaining] word. */

                for ( ; i < p->col; i++) {
                for ( ; i < p->col; i++) {

-                       if (isspace(p->buf[i]))
+                       if (vend > bp && jhy > 0 && i > jhy)

                                break;
                                break;

-                       putchar(p->buf[i]);
-               }
-               vis += vsz;
-               if (i < p->col) {
-                       putchar(' ');
-                       vis++;
+                       if ('\t' == p->buf[i])
+                               break;
+                       if (' ' == p->buf[i]) {
+                               j = i;
+                               while (' ' == p->buf[i])
+                                       i++;
+                               dv = (size_t)(i - j) * (*p->width)(p, ' ');
+                               vbl += dv;
+                               vend += dv;
+                               break;
+                       }
+                       if (ASCII_NBRSP == p->buf[i]) {
+                               vbl += (*p->width)(p, ' ');
+                               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;
+                       }
+
+                       if (ASCII_HYPH == p->buf[i]) {
+                               (*p->letter)(p, '-');
+                               p->viscol += (*p->width)(p, '-');
+                               continue;
+                       }
+
+                       (*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 we're not to right-marginalise it (newline), then instead
-        * pad to the right margin and stay off.
+        * If there was trailing white space, it was not printed;
+        * so reset the cursor position accordingly.

         */
         */

-
-       if (p->flags & TERMP_NOBREAK) {
-               for ( ; vis <= maxvis; vis++)
-                       putchar(' ');
-       } else
-               putchar('\n');
+       if (vis)
+               vis -= vbl;

 
        p->col = 0;
 
        p->col = 0;

+       p->overstep = 0;
+
+       if ( ! (TERMP_NOBREAK & p->flags)) {
+               p->viscol = 0;
+               (*p->endline)(p);
+               return;
+       }
+
+       if (TERMP_HANG & p->flags) {
+               /* We need one blank after the tag. */
+               p->overstep = (int)(vis - maxvis + (*p->width)(p, ' '));
+
+               /*
+                * Behave exactly the same way as groff:
+                * If we have overstepped the margin, temporarily move
+                * it to the right and flag the rest of the line to be
+                * shorter.
+                * If we landed right at the margin, be happy.
+                * If we are one step before the margin, temporarily
+                * move it one step LEFT and flag the rest of the line
+                * to be longer.
+                */
+               if (p->overstep < -1)
+                       p->overstep = 0;
+               return;
+
+       } else if (TERMP_DANGLE & p->flags)
+               return;
+
+       /* If the column was overrun, break the line. */
+       if (maxvis <= vis +
+           ((TERMP_TWOSPACE & p->flags) ? (*p->width)(p, ' ') : 0)) {
+               (*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
 void

-newln(struct termp *p)
+term_newln(struct termp *p)

 {
 
 {
 

-       /* 
-        * A newline only breaks an existing line; it won't assert
-        * vertical space.
-        */

        p->flags |= TERMP_NOSPACE;
        p->flags |= TERMP_NOSPACE;

-       if (0 == p->col) 
-               return;
-       flushln(p);
+       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
 void

-vspace(struct termp *p)
+term_vspace(struct termp *p)

 {
 
 {
 

-       /*
-        * Asserts a vertical space (a full, empty line-break between
-        * lines).
-        */
-       newln(p);
-       putchar('\n');
+       term_newln(p);
+       p->viscol = 0;
+       if (0 < p->skipvsp)
+               p->skipvsp--;
+       else
+               (*p->endline)(p);

 }
 
 }
 

-
-static void
-chara(struct termp *p, char c)
+void
+term_fontlast(struct termp *p)

 {
 {

+       enum termfont    f;

 
 

-       /* TODO: dynamically expand the buffer. */
-       if (p->col + 1 >= p->maxcols)
-               errx(1, "line overrun");
-       p->buf[(p->col)++] = c;
+       f = p->fontl;
+       p->fontl = p->fontq[p->fonti];
+       p->fontq[p->fonti] = f;

 }
 
 
 }
 
 

-static void
-escape(struct termp *p, enum termstyle esc)
+void
+term_fontrepl(struct termp *p, enum termfont f)

 {
 
 {
 

-       if (p->col + 4 >= p->maxcols)
-               errx(1, "line overrun");
+       p->fontl = p->fontq[p->fonti];
+       p->fontq[p->fonti] = f;
+}

 
 

-       p->buf[(p->col)++] = 27;
-       p->buf[(p->col)++] = '[';
-       switch (esc) {
-       case (STYLE_CLEAR):
-               p->buf[(p->col)++] = '0';
-               break;
-       case (STYLE_BOLD):
-               p->buf[(p->col)++] = '1';
-               break;
-       case (STYLE_UNDERLINE):
-               p->buf[(p->col)++] = '4';
-               break;
-       default:
-               abort();
-               /* NOTREACHED */
-       }
-       p->buf[(p->col)++] = 'm';
+
+void
+term_fontpush(struct termp *p, enum termfont f)
+{
+
+       assert(p->fonti + 1 < 10);
+       p->fontl = p->fontq[p->fonti];
+       p->fontq[++p->fonti] = f;

 }
 
 
 }
 
 

-static void
-pword(struct termp *p, const char *word, size_t len)
+const void *
+term_fontq(struct termp *p)

 {
 {

-       size_t           i;

 
 

-       assert(len > 0);
+       return(&p->fontq[p->fonti]);
+}

 
 

-       if ( ! (p->flags & TERMP_NOSPACE))
-               chara(p, ' ');

 
 

-       p->flags &= ~TERMP_NOSPACE;
+enum termfont
+term_fonttop(struct termp *p)
+{

 
 

-       if (p->flags & TERMP_BOLD)
-               escape(p, STYLE_BOLD);
-       if (p->flags & TERMP_UNDERLINE)
-               escape(p, STYLE_UNDERLINE);
+       return(p->fontq[p->fonti]);
+}

 
 

-       /* TODO: escape patterns. */

 
 

-       for (i = 0; i < len; i++) 
-               chara(p, word[i]);
+void
+term_fontpopq(struct termp *p, const void *key)
+{

 
 

-       if (p->flags & TERMP_BOLD ||
-                       p->flags & TERMP_UNDERLINE)
-               escape(p, STYLE_CLEAR);
+       while (p->fonti >= 0 && key != &p->fontq[p->fonti])
+               p->fonti--;
+       assert(p->fonti >= 0);

 }
 
 
 void
 }
 
 
 void

-word(struct termp *p, const char *word)
+term_fontpop(struct termp *p)

 {
 {

-       size_t           i, j, len;

 
 

-       if (mdoc_isdelim(word))
-               p->flags |= TERMP_NOSPACE;
+       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)
+{
+       const char      *seq, *cp;
+       char             c;
+       int              sz, uc;
+       size_t           ssz;
+       enum mandoc_esc  esc;
+
+       if ( ! (TERMP_NOSPACE & p->flags)) {
+               if ( ! (TERMP_KEEP & p->flags)) {
+                       if (TERMP_PREKEEP & p->flags)
+                               p->flags |= TERMP_KEEP;
+                       bufferc(p, ' ');
+                       if (TERMP_SENTENCE & p->flags)
+                               bufferc(p, ' ');
+               } else
+                       bufferc(p, ASCII_NBRSP);
+       }

 
 

-       len = strlen(word);
-       assert(len > 0);
+       if ( ! (p->flags & TERMP_NONOSPACE))
+               p->flags &= ~TERMP_NOSPACE;
+       else
+               p->flags |= TERMP_NOSPACE;

 
 

-       /* LINTED */
-       for (j = i = 0; i < len; i++) {
-               if ( ! isspace(word[i])) {
-                       j++;
+       p->flags &= ~(TERMP_SENTENCE | TERMP_IGNDELIM);
+
+       while ('\0' != *word) {
+               if ('\\' != *word) {
+                       if (TERMP_SKIPCHAR & p->flags) {
+                               p->flags &= ~TERMP_SKIPCHAR;
+                               word++;
+                               continue;
+                       }
+                       ssz = strcspn(word, "\\");
+                       encode(p, word, ssz);
+                       word += (int)ssz;

                        continue;
                }
                        continue;
                }

-               if (0 == j)
-                       continue;
-               assert(i >= j);
-               pword(p, &word[i - j], j);
-               j = 0;
-       }
-       if (j > 0) {
-               assert(i >= j);
-               pword(p, &word[i - j], j);
+
+               word++;
+               esc = mandoc_escape(&word, &seq, &sz);
+               if (ESCAPE_ERROR == esc)
+                       break;
+
+               if (TERMENC_ASCII != p->enc)
+                       switch (esc) {
+                       case (ESCAPE_UNICODE):
+                               uc = mchars_num2uc(seq + 1, sz - 1);
+                               if ('\0' == uc)
+                                       break;
+                               encode1(p, uc);
+                               continue;
+                       case (ESCAPE_SPECIAL):
+                               uc = mchars_spec2cp(p->symtab, seq, sz);
+                               if (uc <= 0)
+                                       break;
+                               encode1(p, uc);
+                               continue;
+                       default:
+                               break;
+                       }
+
+               switch (esc) {
+               case (ESCAPE_UNICODE):
+                       encode1(p, '?');
+                       break;
+               case (ESCAPE_NUMBERED):
+                       c = mchars_num2char(seq, sz);
+                       if ('\0' != c)
+                               encode(p, &c, 1);
+                       break;
+               case (ESCAPE_SPECIAL):
+                       cp = mchars_spec2str(p->symtab, seq, sz, &ssz);
+                       if (NULL != cp) 
+                               encode(p, cp, ssz);
+                       else if (1 == ssz)
+                               encode(p, seq, sz);
+                       break;
+               case (ESCAPE_FONTBOLD):
+                       term_fontrepl(p, TERMFONT_BOLD);
+                       break;
+               case (ESCAPE_FONTITALIC):
+                       term_fontrepl(p, TERMFONT_UNDER);
+                       break;
+               case (ESCAPE_FONT):
+                       /* FALLTHROUGH */
+               case (ESCAPE_FONTROMAN):
+                       term_fontrepl(p, TERMFONT_NONE);
+                       break;
+               case (ESCAPE_FONTPREV):
+                       term_fontlast(p);
+                       break;
+               case (ESCAPE_NOSPACE):
+                       if (TERMP_SKIPCHAR & p->flags)
+                               p->flags &= ~TERMP_SKIPCHAR;
+                       else if ('\0' == *word)
+                               p->flags |= TERMP_NOSPACE;
+                       break;
+               case (ESCAPE_SKIPCHAR):
+                       p->flags |= TERMP_SKIPCHAR;
+                       break;
+               default:
+                       break;
+               }

        }
 }
 
        }
 }
 

-

 static void
 static void

-termprint_r(struct termp *p, const struct mdoc_meta *meta,
-               const struct mdoc_node *node)
+adjbuf(struct termp *p, int sz)

 {
 {

-       int              dochild;

 
 

-       /* Pre-processing. */
+       if (0 == p->maxcols)
+               p->maxcols = 1024;
+       while (sz >= p->maxcols)
+               p->maxcols <<= 2;
+
+       p->buf = mandoc_realloc
+               (p->buf, sizeof(int) * (size_t)p->maxcols);
+}
+
+static void
+bufferc(struct termp *p, char c)
+{

 
 

-       dochild = 1;
+       if (p->col + 1 >= p->maxcols)
+               adjbuf(p, p->col + 1);

 
 

-       if (MDOC_TEXT != node->type) {
-               if (termacts[node->tok].pre)
-                       if ( ! (*termacts[node->tok].pre)(p, meta, node))
-                               dochild = 0;
-       } else /* MDOC_TEXT == node->type */
-               word(p, node->data.text.string);
+       p->buf[p->col++] = c;
+}

 
 

-       /* Children. */
+/*
+ * 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 (dochild && node->child)
-               termprint_r(p, meta, node->child);
+       if (TERMP_SKIPCHAR & p->flags) {
+               p->flags &= ~TERMP_SKIPCHAR;
+               return;
+       }

 
 

-       /* Post-processing. */
+       if (p->col + 4 >= p->maxcols)
+               adjbuf(p, p->col + 4);

 
 

-       if (MDOC_TEXT != node->type) {
-               if (termacts[node->tok].post)
-                       if ( ! (*termacts[node->tok].post)(p, meta, node))
-                               return;
-       } 
+       f = term_fonttop(p);

 
 

-       /* Siblings. */
+       if (TERMFONT_NONE == f) {
+               p->buf[p->col++] = c;
+               return;
+       } else if (TERMFONT_UNDER == f) {
+               p->buf[p->col++] = '_';
+       } else
+               p->buf[p->col++] = c;

 
 

-       if (node->next)
-               termprint_r(p, meta, node->next);
+       p->buf[p->col++] = 8;
+       p->buf[p->col++] = c;

 }
 
 }
 

-

 static void
 static void

-termprint_footer(struct termp *p, const struct mdoc_meta *meta)
+encode(struct termp *p, const char *word, size_t sz)

 {
 {

-       struct tm       *tm;
-       char            *buf, *os;
-       size_t           sz, osz, ssz, i;
+       enum termfont     f;
+       int               i, len;

 
 

-       if (NULL == (buf = malloc(p->rmargin)))
-               err(1, "malloc");
-       if (NULL == (os = malloc(p->rmargin)))
-               err(1, "malloc");
+       if (TERMP_SKIPCHAR & p->flags) {
+               p->flags &= ~TERMP_SKIPCHAR;
+               return;
+       }

 
 

-       tm = localtime(&meta->date);
-       if (NULL == strftime(buf, p->rmargin, "%B %d, %Y", tm))
-               err(1, "strftime");
+       /* LINTED */
+       len = sz;

 
 

-       osz = strlcpy(os, meta->os, p->rmargin);
+       /*
+        * Encode and buffer a string of characters.  If the current
+        * font mode is unset, buffer directly, else encode then buffer
+        * character by character.
+        */
+
+       if (TERMFONT_NONE == (f = term_fonttop(p))) {
+               if (p->col + len >= p->maxcols) 
+                       adjbuf(p, p->col + len);
+               for (i = 0; i < len; i++)
+                       p->buf[p->col++] = word[i];
+               return;
+       }

 
 

-       sz = strlen(buf);
-       ssz = sz + osz + 1;
+       /* Pre-buffer, assuming worst-case. */

 
 

-       if (ssz > p->rmargin) {
-               ssz -= p->rmargin;
-               assert(ssz <= osz);
-               os[osz - ssz] = 0;
-               ssz = 1;
-       } else
-               ssz = p->rmargin - ssz + 1;
+       if (p->col + 1 + (len * 3) >= p->maxcols)
+               adjbuf(p, p->col + 1 + (len * 3));

 
 

-       printf("\n");
-       printf("%s", os);
-       for (i = 0; i < ssz; i++)
-               printf(" ");
+       for (i = 0; i < len; i++) {
+               if (ASCII_HYPH != word[i] &&
+                   ! isgraph((unsigned char)word[i])) {
+                       p->buf[p->col++] = word[i];
+                       continue;
+               }

 
 

-       printf("%s\n", buf);
-       fflush(stdout);
+               if (TERMFONT_UNDER == f)
+                       p->buf[p->col++] = '_';
+               else if (ASCII_HYPH == word[i])
+                       p->buf[p->col++] = '-';
+               else
+                       p->buf[p->col++] = word[i];

 
 

-       free(buf);
-       free(os);
+               p->buf[p->col++] = 8;
+               p->buf[p->col++] = word[i];
+       }

 }
 
 }
 

-
-static void
-termprint_header(struct termp *p, const struct mdoc_meta *meta)
+size_t
+term_len(const struct termp *p, size_t sz)

 {
 {

-       char            *msec, *buf, *title, *pp;
-       size_t           ssz, tsz, ttsz, i;;

 
 

-       if (NULL == (buf = malloc(p->rmargin)))
-               err(1, "malloc");
-       if (NULL == (title = malloc(p->rmargin)))
-               err(1, "malloc");
+       return((*p->width)(p, ' ') * sz);
+}

 
 

-       if (NULL == (pp = mdoc_vol2a(meta->vol)))
-               switch (meta->msec) {
-               case (MSEC_1):
-                       /* FALLTHROUGH */
-               case (MSEC_6):
-                       /* FALLTHROUGH */
-               case (MSEC_7):
-                       pp = mdoc_vol2a(VOL_URM);
-                       break;
-               case (MSEC_8):
-                       pp = mdoc_vol2a(VOL_SMM);
-                       break;
-               case (MSEC_2):
-                       /* FALLTHROUGH */
-               case (MSEC_3):
-                       /* FALLTHROUGH */
-               case (MSEC_4):
-                       /* FALLTHROUGH */
-               case (MSEC_5):
-                       pp = mdoc_vol2a(VOL_PRM);
-                       break;
-               case (MSEC_9):
-                       pp = mdoc_vol2a(VOL_KM);
-                       break;
-               default:
-                       /* FIXME: capitalise. */
-                       if (NULL == (pp = mdoc_msec2a(meta->msec)))
-                               pp = mdoc_msec2a(MSEC_local);
-                       break;
-               }
-       assert(pp);
-
-       tsz = strlcpy(buf, pp, p->rmargin);
-       assert(tsz < p->rmargin);
-
-       if ((pp = mdoc_arch2a(meta->arch))) {
-               tsz = strlcat(buf, " (", p->rmargin);
-               assert(tsz < p->rmargin);
-               tsz = strlcat(buf, pp, p->rmargin);
-               assert(tsz < p->rmargin);
-               tsz = strlcat(buf, ")", p->rmargin);
-               assert(tsz < p->rmargin);
-       }
+static size_t
+cond_width(const struct termp *p, int c, int *skip)
+{

 
 

-       ttsz = strlcpy(title, meta->title, p->rmargin);
+       if (*skip) {
+               (*skip) = 0;
+               return(0);
+       } else
+               return((*p->width)(p, c));
+}

 
 

-       if (NULL == (msec = mdoc_msec2a(meta->msec)))
-               msec = "";
+size_t
+term_strlen(const struct termp *p, const char *cp)
+{
+       size_t           sz, rsz, i;
+       int              ssz, skip, c;
+       const char      *seq, *rhs;
+       enum mandoc_esc  esc;
+       static const char rej[] = { '\\', ASCII_HYPH, ASCII_NBRSP, '\0' };

 
 

-       ssz = (2 * (ttsz + 2 + strlen(msec))) + tsz + 2;
+       /*
+        * Account for escaped sequences within string length
+        * calculations.  This follows the logic in term_word() as we
+        * must calculate the width of produced strings.
+        */

 
 

-       if (ssz > p->rmargin) {
-               if ((ssz -= p->rmargin) % 2)
-                       ssz++;
-               ssz /= 2;
-       
-               assert(ssz <= ttsz);
-               title[ttsz - ssz] = 0;
-               ssz = 1;
-       } else
-               ssz = ((p->rmargin - ssz) / 2) + 1;
+       sz = 0;
+       skip = 0;
+       while ('\0' != *cp) {
+               rsz = strcspn(cp, rej);
+               for (i = 0; i < rsz; i++)
+                       sz += cond_width(p, *cp++, &skip);
+
+               c = 0;
+               switch (*cp) {
+               case ('\\'):
+                       cp++;
+                       esc = mandoc_escape(&cp, &seq, &ssz);
+                       if (ESCAPE_ERROR == esc)
+                               return(sz);
+
+                       if (TERMENC_ASCII != p->enc)
+                               switch (esc) {
+                               case (ESCAPE_UNICODE):
+                                       c = mchars_num2uc
+                                               (seq + 1, ssz - 1);
+                                       if ('\0' == c)
+                                               break;
+                                       sz += cond_width(p, c, &skip);
+                                       continue;
+                               case (ESCAPE_SPECIAL):
+                                       c = mchars_spec2cp
+                                               (p->symtab, seq, ssz);
+                                       if (c <= 0)
+                                               break;
+                                       sz += cond_width(p, c, &skip);
+                                       continue;
+                               default:
+                                       break;
+                               }
+
+                       rhs = NULL;
+
+                       switch (esc) {
+                       case (ESCAPE_UNICODE):
+                               sz += cond_width(p, '?', &skip);
+                               break;
+                       case (ESCAPE_NUMBERED):
+                               c = mchars_num2char(seq, ssz);
+                               if ('\0' != c)
+                                       sz += cond_width(p, c, &skip);
+                               break;
+                       case (ESCAPE_SPECIAL):
+                               rhs = mchars_spec2str
+                                       (p->symtab, seq, ssz, &rsz);

 
 

-       printf("%s(%s)", title, msec);
+                               if (ssz != 1 || rhs)
+                                       break;

 
 

-       for (i = 0; i < ssz; i++)
-               printf(" ");
+                               rhs = seq;
+                               rsz = ssz;
+                               break;
+                       case (ESCAPE_SKIPCHAR):
+                               skip = 1;
+                               break;
+                       default:
+                               break;
+                       }

 
 

-       printf("%s", buf);
+                       if (NULL == rhs)
+                               break;

 
 

-       for (i = 0; i < ssz; i++)
-               printf(" ");
+                       if (skip) {
+                               skip = 0;
+                               break;
+                       }

 
 

-       printf("%s(%s)\n", title, msec);
-       fflush(stdout);
+                       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;
+               }
+       }

 
 

-       free(title);
-       free(buf);
+       return(sz);

 }
 
 }
 

-
-int
-termprint(const struct mdoc_node *node,
-               const struct mdoc_meta *meta)
+/* ARGSUSED */
+size_t
+term_vspan(const struct termp *p, const struct roffsu *su)

 {
 {

-       struct termp     p;
-
-       p.maxrmargin = 80; /* XXX */
-       p.rmargin = p.maxrmargin;
-       p.maxcols = 1024;
-       p.offset = p.col = 0;
-       p.flags = TERMP_NOSPACE;
-
-       if (NULL == (p.buf = malloc(p.maxcols)))
-               err(1, "malloc");
+       double           r;

 
 

-       termprint_header(&p, meta);
-       termprint_r(&p, meta, node);
-       termprint_footer(&p, meta);
-
-       free(p.buf);
+       switch (su->unit) {
+       case (SCALE_CM):
+               r = su->scale * 2;
+               break;
+       case (SCALE_IN):
+               r = su->scale * 6;
+               break;
+       case (SCALE_PC):
+               r = su->scale;
+               break;
+       case (SCALE_PT):
+               r = su->scale / 8;
+               break;
+       case (SCALE_MM):
+               r = su->scale / 1000;
+               break;
+       case (SCALE_VS):
+               r = su->scale;
+               break;
+       default:
+               r = su->scale - 1;
+               break;
+       }

 
 

-       return(1);
+       if (r < 0.0)
+               r = 0.0;
+       return(/* LINTED */(size_t)
+                       r);

 }
 
 }
 

+size_t
+term_hspan(const struct termp *p, const struct roffsu *su)
+{
+       double           v;

 
 

+       v = ((*p->hspan)(p, su));
+       if (v < 0.0)
+               v = 0.0;
+       return((size_t) /* LINTED */
+                       v);
+}