/* $OpenBSD: man_term.c,v 1.202 2026/01/07 08:22:24 schwarze Exp $ */
/*
 * Copyright (c) 2010-2020, 2022-23, 2025, 2026
 *               Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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.
 *
 * Plain text formatter for man(7), used by mandoc(1)
 * for ASCII, UTF-8, PostScript, and PDF output.
 */
#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "man.h"
#include "out.h"
#include "term.h"
#include "term_tag.h"
#include "main.h"

#define MAXMARGINS        64 /* Maximum number of indented scopes. */

struct  mtermp {
        int               lmargin[MAXMARGINS]; /* Margins in basic units. */
        int               lmargincur; /* Index of current margin. */
        int               lmarginsz; /* Actual number of nested margins. */
        size_t            offset; /* Default offset in basic units. */
        int               pardist; /* Vert. space before par., unit: [v]. */
};

#define DECL_ARGS         struct termp *p, \
                          struct mtermp *mt, \
                          struct roff_node *n, \
                          const struct roff_meta *meta

struct  man_term_act {
        int             (*pre)(DECL_ARGS);
        void            (*post)(DECL_ARGS);
        int               flags;
#define MAN_NOTEXT       (1 << 0) /* Never has text children. */
};

static  void              print_man_nodelist(DECL_ARGS);
static  void              print_man_node(DECL_ARGS);
static  void              print_man_head(struct termp *,
                                const struct roff_meta *);
static  void              print_man_foot(struct termp *,
                                const struct roff_meta *);
static  void              print_bvspace(struct termp *,
                                struct roff_node *, int);

static  int               pre_B(DECL_ARGS);
static  int               pre_DT(DECL_ARGS);
static  int               pre_HP(DECL_ARGS);
static  int               pre_I(DECL_ARGS);
static  int               pre_IP(DECL_ARGS);
static  int               pre_MR(DECL_ARGS);
static  int               pre_OP(DECL_ARGS);
static  int               pre_PD(DECL_ARGS);
static  int               pre_PP(DECL_ARGS);
static  int               pre_RS(DECL_ARGS);
static  int               pre_SH(DECL_ARGS);
static  int               pre_SS(DECL_ARGS);
static  int               pre_SY(DECL_ARGS);
static  int               pre_TP(DECL_ARGS);
static  int               pre_UR(DECL_ARGS);
static  int               pre_alternate(DECL_ARGS);
static  int               pre_ign(DECL_ARGS);
static  int               pre_in(DECL_ARGS);
static  int               pre_literal(DECL_ARGS);

static  void              post_IP(DECL_ARGS);
static  void              post_HP(DECL_ARGS);
static  void              post_RS(DECL_ARGS);
static  void              post_SH(DECL_ARGS);
static  void              post_SY(DECL_ARGS);
static  void              post_TP(DECL_ARGS);
static  void              post_UR(DECL_ARGS);

static const struct man_term_act man_term_acts[MAN_MAX - MAN_TH] = {
        { NULL, NULL, 0 }, /* TH */
        { pre_SH, post_SH, 0 }, /* SH */
        { pre_SS, post_SH, 0 }, /* SS */
        { pre_TP, post_TP, 0 }, /* TP */
        { pre_TP, post_TP, 0 }, /* TQ */
        { pre_PP, NULL, 0 }, /* LP */
        { pre_PP, NULL, 0 }, /* PP */
        { pre_PP, NULL, 0 }, /* P */
        { pre_IP, post_IP, 0 }, /* IP */
        { pre_HP, post_HP, 0 }, /* HP */
        { NULL, NULL, 0 }, /* SM */
        { pre_B, NULL, 0 }, /* SB */
        { pre_alternate, NULL, 0 }, /* BI */
        { pre_alternate, NULL, 0 }, /* IB */
        { pre_alternate, NULL, 0 }, /* BR */
        { pre_alternate, NULL, 0 }, /* RB */
        { NULL, NULL, 0 }, /* R */
        { pre_B, NULL, 0 }, /* B */
        { pre_I, NULL, 0 }, /* I */
        { pre_alternate, NULL, 0 }, /* IR */
        { pre_alternate, NULL, 0 }, /* RI */
        { NULL, NULL, 0 }, /* RE */
        { pre_RS, post_RS, 0 }, /* RS */
        { pre_DT, NULL, MAN_NOTEXT }, /* DT */
        { pre_ign, NULL, MAN_NOTEXT }, /* UC */
        { pre_PD, NULL, MAN_NOTEXT }, /* PD */
        { pre_ign, NULL, MAN_NOTEXT }, /* AT */
        { pre_in, NULL, MAN_NOTEXT }, /* in */
        { pre_SY, post_SY, 0 }, /* SY */
        { NULL, NULL, 0 }, /* YS */
        { pre_OP, NULL, 0 }, /* OP */
        { pre_literal, NULL, 0 }, /* EX */
        { pre_literal, NULL, 0 }, /* EE */
        { pre_UR, post_UR, 0 }, /* UR */
        { NULL, NULL, 0 }, /* UE */
        { pre_UR, post_UR, 0 }, /* MT */
        { NULL, NULL, 0 }, /* ME */
        { pre_MR, NULL, 0 }, /* MR */
};
static const struct man_term_act *man_term_act(enum roff_tok);


static const struct man_term_act *
man_term_act(enum roff_tok tok)
{
        assert(tok >= MAN_TH && tok <= MAN_MAX);
        return man_term_acts + (tok - MAN_TH);
}

void
terminal_man(void *arg, const struct roff_meta *man)
{
        struct mtermp            mt;
        struct termp            *p;
        struct roff_node        *n, *nc, *nn;

        p = (struct termp *)arg;
        p->tcol->rmargin = p->maxrmargin = p->defrmargin;
        term_tab_set(p, NULL);
        term_tab_set(p, "T");
        term_tab_set(p, ".5i");

        memset(&mt, 0, sizeof(mt));
        mt.lmargin[mt.lmargincur] = term_len(p, 7);
        mt.offset = term_len(p, p->defindent);
        mt.pardist = 1;

        n = man->first->child;
        if (p->synopsisonly) {
                for (nn = NULL; n != NULL; n = n->next) {
                        if (n->tok != MAN_SH)
                                continue;
                        nc = n->child->child;
                        if (nc->type != ROFFT_TEXT)
                                continue;
                        if (strcmp(nc->string, "SYNOPSIS") == 0)
                                break;
                        if (nn == NULL && strcmp(nc->string, "NAME") == 0)
                                nn = n;
                }
                if (n == NULL)
                        n = nn;
                p->flags |= TERMP_NOSPACE;
                if (n != NULL && (n = n->child->next->child) != NULL)
                        print_man_nodelist(p, &mt, n, man);
                term_newln(p);
        } else {
                term_begin(p, print_man_head, print_man_foot, man);
                p->flags |= TERMP_NOSPACE;
                if (n != NULL)
                        print_man_nodelist(p, &mt, n, man);
                term_end(p);
        }
}

/*
 * Print leading vertical space before a paragraph, unless
 * it is the first paragraph in a section or subsection.
 * If it is the first paragraph in an .RS block, consider
 * that .RS block instead of the paragraph, recursively.
 */
static void
print_bvspace(struct termp *p, struct roff_node *n, int pardist)
{
        struct roff_node        *nch;
        int                      i;

        term_newln(p);

        if (n->body != NULL &&
            (nch = roff_node_child(n->body)) != NULL &&
            nch->type == ROFFT_TBL)
                return;

        while (roff_node_prev(n) == NULL) {
                n = n->parent;
                if (n->tok != MAN_RS)
                        return;
                if (n->type == ROFFT_BODY)
                        n = n->parent;
        }
        for (i = 0; i < pardist; i++)
                term_vspace(p);
}

static int
pre_ign(DECL_ARGS)
{
        return 0;
}

static int
pre_I(DECL_ARGS)
{
        term_fontrepl(p, TERMFONT_UNDER);
        return 1;
}

static int
pre_literal(DECL_ARGS)
{
        term_newln(p);

        /*
         * Unlike .IP and .TP, .HP does not have a HEAD.
         * So in case a second call to term_flushln() is needed,
         * indentation has to be set up explicitly.
         */
        if (n->parent->tok == MAN_HP && p->tcol->rmargin < p->maxrmargin) {
                p->tcol->offset = p->tcol->rmargin;
                p->tcol->rmargin = p->maxrmargin;
                p->trailspace = 0;
                p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
                p->flags |= TERMP_NOSPACE;
        }
        return 0;
}

static int
pre_PD(DECL_ARGS)
{
        struct roffsu    su;

        n = n->child;
        if (n == NULL) {
                mt->pardist = 1;
                return 0;
        }
        assert(n->type == ROFFT_TEXT);
        if (a2roffsu(n->string, &su, SCALE_VS) != NULL)
                mt->pardist = term_vspan(p, &su);
        return 0;
}

static int
pre_alternate(DECL_ARGS)
{
        enum termfont            font[2];
        struct roff_node        *nn;
        int                      i;

        switch (n->tok) {
        case MAN_RB:
                font[0] = TERMFONT_NONE;
                font[1] = TERMFONT_BOLD;
                break;
        case MAN_RI:
                font[0] = TERMFONT_NONE;
                font[1] = TERMFONT_UNDER;
                break;
        case MAN_BR:
                font[0] = TERMFONT_BOLD;
                font[1] = TERMFONT_NONE;
                break;
        case MAN_BI:
                font[0] = TERMFONT_BOLD;
                font[1] = TERMFONT_UNDER;
                break;
        case MAN_IR:
                font[0] = TERMFONT_UNDER;
                font[1] = TERMFONT_NONE;
                break;
        case MAN_IB:
                font[0] = TERMFONT_UNDER;
                font[1] = TERMFONT_BOLD;
                break;
        default:
                abort();
        }
        for (i = 0, nn = n->child; nn != NULL; nn = nn->next, i = 1 - i) {
                term_fontrepl(p, font[i]);
                assert(nn->type == ROFFT_TEXT);
                term_word(p, nn->string);
                if (nn->flags & NODE_EOS)
                        p->flags |= TERMP_SENTENCE;
                if (nn->next != NULL)
                        p->flags |= TERMP_NOSPACE;
        }
        return 0;
}

static int
pre_B(DECL_ARGS)
{
        term_fontrepl(p, TERMFONT_BOLD);
        return 1;
}

static int
pre_MR(DECL_ARGS)
{
        term_fontrepl(p, TERMFONT_NONE);
        n = n->child;
        if (n != NULL) {
                term_word(p, n->string);   /* name */
                p->flags |= TERMP_NOSPACE;
        }
        term_word(p, "(");
        p->flags |= TERMP_NOSPACE;
        if (n != NULL && (n = n->next) != NULL) {
                term_word(p, n->string);   /* section */
                p->flags |= TERMP_NOSPACE;
        }
        term_word(p, ")");
        if (n != NULL && (n = n->next) != NULL) {
                p->flags |= TERMP_NOSPACE;
                term_word(p, n->string);   /* suffix */
        }
        return 0;
}

static int
pre_OP(DECL_ARGS)
{
        term_word(p, "[");
        p->flags |= TERMP_KEEP | TERMP_NOSPACE;

        if ((n = n->child) != NULL) {
                term_fontrepl(p, TERMFONT_BOLD);
                term_word(p, n->string);
        }
        if (n != NULL && n->next != NULL) {
                term_fontrepl(p, TERMFONT_UNDER);
                term_word(p, n->next->string);
        }
        term_fontrepl(p, TERMFONT_NONE);
        p->flags &= ~TERMP_KEEP;
        p->flags |= TERMP_NOSPACE;
        term_word(p, "]");
        return 0;
}

static int
pre_in(DECL_ARGS)
{
        struct roffsu    su;
        const char      *cp;    /* Request argument. */
        size_t           v;     /* Indentation in basic units. */
        int              less;

        term_newln(p);

        if (n->child == NULL) {
                p->tcol->offset = mt->offset;
                return 0;
        }

        cp = n->child->string;
        less = 0;

        if (*cp == '-') {
                less = -1;
                cp++;
        } else if (*cp == '+') {
                less = 1;
                cp++;
        }

        if (a2roffsu(cp, &su, SCALE_EN) == NULL)
                return 0;

        v = term_hspan(p, &su);

        if (less < 0)
                p->tcol->offset -= p->tcol->offset > v ? v : p->tcol->offset;
        else if (less > 0)
                p->tcol->offset += v;
        else
                p->tcol->offset = v;
        if (p->tcol->offset > SHRT_MAX)
                p->tcol->offset = term_len(p, p->defindent);

        return 0;
}

static int
pre_DT(DECL_ARGS)
{
        term_tab_set(p, NULL);
        term_tab_set(p, "T");
        term_tab_set(p, ".5i");
        return 0;
}

static int
pre_HP(DECL_ARGS)
{
        struct roffsu            su;
        const struct roff_node  *nn;
        int                      len;   /* Indentation in basic units. */

        switch (n->type) {
        case ROFFT_BLOCK:
                print_bvspace(p, n, mt->pardist);
                return 1;
        case ROFFT_HEAD:
                return 0;
        case ROFFT_BODY:
                break;
        default:
                abort();
        }

        if (n->child == NULL)
                return 0;

        if ((n->child->flags & NODE_NOFILL) == 0) {
                p->flags |= TERMP_NOBREAK | TERMP_BRIND;
                p->trailspace = 2;
        }

        /* Calculate offset. */

        if ((nn = n->parent->head->child) != NULL &&
            a2roffsu(nn->string, &su, SCALE_EN) != NULL) {
                len = term_hspan(p, &su);
                if (len < 0 && (size_t)(-len) > mt->offset)
                        len = -mt->offset;
                else if (len > SHRT_MAX)
                        len = term_len(p, p->defindent);
                mt->lmargin[mt->lmargincur] = len;
        } else
                len = mt->lmargin[mt->lmargincur];

        p->tcol->offset = mt->offset;
        p->tcol->rmargin = mt->offset + len;
        return 1;
}

static void
post_HP(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
        case ROFFT_HEAD:
                break;
        case ROFFT_BODY:
                term_newln(p);

                /*
                 * Compatibility with a groff bug.
                 * The .HP macro uses the undocumented .tag request
                 * which causes a line break and cancels no-space
                 * mode even if there isn't any output.
                 */

                if (n->child == NULL)
                        term_vspace(p);

                p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
                p->trailspace = 0;
                p->tcol->offset = mt->offset;
                p->tcol->rmargin = p->maxrmargin;
                break;
        default:
                abort();
        }
}

static int
pre_PP(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                mt->lmargin[mt->lmargincur] = term_len(p, 7);
                print_bvspace(p, n, mt->pardist);
                break;
        case ROFFT_HEAD:
                return 0;
        case ROFFT_BODY:
                p->tcol->offset = mt->offset;
                break;
        default:
                abort();
        }
        return 1;
}

static int
pre_IP(DECL_ARGS)
{
        struct roffsu            su;
        const struct roff_node  *nn;
        int                      len;   /* Indentation in basic units. */

        switch (n->type) {
        case ROFFT_BLOCK:
                print_bvspace(p, n, mt->pardist);
                return 1;
        case ROFFT_HEAD:
                p->flags |= TERMP_NOBREAK;
                p->trailspace = 1;
                break;
        case ROFFT_BODY:
                p->flags |= TERMP_NOSPACE | TERMP_NONEWLINE;
                break;
        default:
                abort();
        }

        /* Calculate the offset from the optional second argument. */
        if ((nn = n->parent->head->child) != NULL &&
            (nn = nn->next) != NULL &&
            a2roffsu(nn->string, &su, SCALE_EN) != NULL) {
                len = term_hspan(p, &su);
                if (len < 0 && (size_t)(-len) > mt->offset)
                        len = -mt->offset;
                else if (len > SHRT_MAX)
                        len = term_len(p, p->defindent);
                mt->lmargin[mt->lmargincur] = len;
        } else
                len = mt->lmargin[mt->lmargincur];

        switch (n->type) {
        case ROFFT_HEAD:
                p->tcol->offset = mt->offset;
                p->tcol->rmargin = mt->offset + len;
                if (n->child != NULL)
                        print_man_node(p, mt, n->child, meta);
                return 0;
        case ROFFT_BODY:
                p->tcol->offset = mt->offset + len;
                p->tcol->rmargin = p->maxrmargin;
                break;
        default:
                abort();
        }
        return 1;
}

static void
post_IP(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                break;
        case ROFFT_HEAD:
                term_flushln(p);
                p->flags &= ~TERMP_NOBREAK;
                p->trailspace = 0;
                p->tcol->rmargin = p->maxrmargin;
                break;
        case ROFFT_BODY:
                term_newln(p);
                p->tcol->offset = mt->offset;
                break;
        default:
                abort();
        }
}

static int
pre_TP(DECL_ARGS)
{
        struct roffsu            su;
        struct roff_node        *nn;
        int                      len;   /* Indentation in basic units. */

        switch (n->type) {
        case ROFFT_BLOCK:
                if (n->tok == MAN_TP)
                        print_bvspace(p, n, mt->pardist);
                return 1;
        case ROFFT_HEAD:
                p->flags |= TERMP_NOBREAK | TERMP_BRTRSP;
                p->trailspace = 1;
                break;
        case ROFFT_BODY:
                p->flags |= TERMP_NOSPACE | TERMP_NONEWLINE;
                break;
        default:
                abort();
        }

        /* Calculate offset. */

        if ((nn = n->parent->head->child) != NULL &&
            nn->string != NULL && ! (NODE_LINE & nn->flags) &&
            a2roffsu(nn->string, &su, SCALE_EN) != NULL) {
                len = term_hspan(p, &su);
                if (len < 0 && (size_t)(-len) > mt->offset)
                        len = -mt->offset;
                else if (len > SHRT_MAX)
                        len = term_len(p, p->defindent);
                mt->lmargin[mt->lmargincur] = len;
        } else
                len = mt->lmargin[mt->lmargincur];

        switch (n->type) {
        case ROFFT_HEAD:
                p->tcol->offset = mt->offset;
                p->tcol->rmargin = mt->offset + len;

                /* Don't print same-line elements. */
                nn = n->child;
                while (nn != NULL && (nn->flags & NODE_LINE) == 0)
                        nn = nn->next;

                while (nn != NULL) {
                        print_man_node(p, mt, nn, meta);
                        nn = nn->next;
                }
                return 0;
        case ROFFT_BODY:
                p->tcol->offset = mt->offset + len;
                p->tcol->rmargin = p->maxrmargin;
                p->trailspace = 0;
                p->flags &= ~(TERMP_NOBREAK | TERMP_BRTRSP);
                break;
        default:
                abort();
        }
        return 1;
}

static void
post_TP(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                break;
        case ROFFT_HEAD:
                term_flushln(p);
                break;
        case ROFFT_BODY:
                term_newln(p);
                p->tcol->offset = mt->offset;
                break;
        default:
                abort();
        }
}

static int
pre_SS(DECL_ARGS)
{
        int      i;

        switch (n->type) {
        case ROFFT_BLOCK:
                mt->lmargin[mt->lmargincur] = term_len(p, 7);
                mt->offset = term_len(p, p->defindent);

                /*
                 * No vertical space before the first subsection
                 * and after an empty subsection.
                 */

                if ((n = roff_node_prev(n)) == NULL ||
                    (n->tok == MAN_SS && roff_node_child(n->body) == NULL))
                        break;

                for (i = 0; i < mt->pardist; i++)
                        term_vspace(p);
                break;
        case ROFFT_HEAD:
                p->fontibi = 1;
                term_fontrepl(p, TERMFONT_BOLD);
                p->tcol->offset = term_len(p, p->defindent) / 2 + 1;
                p->tcol->rmargin = mt->offset;
                p->trailspace = mt->offset / term_len(p, 1);
                p->flags |= TERMP_NOBREAK | TERMP_BRIND;
                break;
        case ROFFT_BODY:
                p->tcol->offset = mt->offset;
                p->tcol->rmargin = p->maxrmargin;
                p->trailspace = 0;
                p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
                break;
        default:
                break;
        }
        return 1;
}

static int
pre_SH(DECL_ARGS)
{
        int      i;

        switch (n->type) {
        case ROFFT_BLOCK:
                mt->lmargin[mt->lmargincur] = term_len(p, 7);
                mt->offset = term_len(p, p->defindent);

                /*
                 * No vertical space before the first section
                 * and after an empty section.
                 */

                if ((n = roff_node_prev(n)) == NULL ||
                    (n->tok == MAN_SH && roff_node_child(n->body) == NULL))
                        break;

                for (i = 0; i < mt->pardist; i++)
                        term_vspace(p);
                break;
        case ROFFT_HEAD:
                p->fontibi = 1;
                term_fontrepl(p, TERMFONT_BOLD);
                p->tcol->offset = 0;
                p->tcol->rmargin = mt->offset;
                p->trailspace = mt->offset / term_len(p, 1);
                p->flags |= TERMP_NOBREAK | TERMP_BRIND;
                break;
        case ROFFT_BODY:
                p->tcol->offset = mt->offset;
                p->tcol->rmargin = p->maxrmargin;
                p->trailspace = 0;
                p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
                break;
        default:
                abort();
        }
        return 1;
}

static void
post_SH(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                break;
        case ROFFT_HEAD:
                p->fontibi = 0;
                /* FALLTHROUGH */
        case ROFFT_BODY:
                term_newln(p);
                break;
        default:
                abort();
        }
}

static int
pre_RS(DECL_ARGS)
{
        struct roffsu    su;

        switch (n->type) {
        case ROFFT_BLOCK:
                term_newln(p);
                return 1;
        case ROFFT_HEAD:
                return 0;
        case ROFFT_BODY:
                break;
        default:
                abort();
        }

        n = n->parent->head;
        n->aux = SHRT_MAX + 1;
        if (n->child == NULL)
                n->aux = mt->lmargin[mt->lmargincur];
        else if (a2roffsu(n->child->string, &su, SCALE_EN) != NULL)
                n->aux = term_hspan(p, &su);
        if (n->aux < 0 && (size_t)(-n->aux) > mt->offset)
                n->aux = -mt->offset;
        else if (n->aux > SHRT_MAX)
                n->aux = term_len(p, p->defindent);

        mt->offset += n->aux;
        p->tcol->offset = mt->offset;
        p->tcol->rmargin = p->maxrmargin;

        if (++mt->lmarginsz < MAXMARGINS)
                mt->lmargincur = mt->lmarginsz;

        mt->lmargin[mt->lmargincur] = term_len(p, 7);
        return 1;
}

static void
post_RS(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
        case ROFFT_HEAD:
                return;
        case ROFFT_BODY:
                break;
        default:
                abort();
        }
        term_newln(p);
        mt->offset -= n->parent->head->aux;
        p->tcol->offset = mt->offset;
        if (--mt->lmarginsz < MAXMARGINS)
                mt->lmargincur = mt->lmarginsz;
}

static int
pre_SY(DECL_ARGS)
{
        const struct roff_node  *nn;
        int                      len;   /* Indentation in basic units. */

        switch (n->type) {
        case ROFFT_BLOCK:
                if ((nn = roff_node_prev(n)) == NULL || nn->tok != MAN_SY)
                        print_bvspace(p, n, mt->pardist);
                return 1;
        case ROFFT_HEAD:
        case ROFFT_BODY:
                break;
        default:
                abort();
        }

        nn = n->parent->head->child;
        len = term_len(p, 1);
        if (nn != NULL)
                len += term_strlen(p, nn->string);

        switch (n->type) {
        case ROFFT_HEAD:
                p->tcol->offset = mt->offset;
                p->tcol->rmargin = mt->offset + len;
                if (n->next->child == NULL ||
                    (n->next->child->flags & NODE_NOFILL) == 0)
                        p->flags |= TERMP_NOBREAK;
                term_fontrepl(p, TERMFONT_BOLD);
                break;
        case ROFFT_BODY:
                mt->lmargin[mt->lmargincur] = len;
                p->tcol->offset = mt->offset + len;
                p->tcol->rmargin = p->maxrmargin;
                p->flags |= TERMP_NOSPACE;
                break;
        default:
                abort();
        }
        return 1;
}

static void
post_SY(DECL_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                break;
        case ROFFT_HEAD:
                term_flushln(p);
                p->flags &= ~TERMP_NOBREAK;
                break;
        case ROFFT_BODY:
                term_newln(p);
                p->tcol->offset = mt->offset;
                break;
        default:
                abort();
        }
}

static int
pre_UR(DECL_ARGS)
{
        return n->type != ROFFT_HEAD;
}

static void
post_UR(DECL_ARGS)
{
        if (n->type != ROFFT_BLOCK)
                return;

        term_word(p, "<");
        p->flags |= TERMP_NOSPACE;

        if (n->child->child != NULL)
                print_man_node(p, mt, n->child->child, meta);

        p->flags |= TERMP_NOSPACE;
        term_word(p, ">");
}

static void
print_man_node(DECL_ARGS)
{
        const struct man_term_act *act;
        int c;

        /*
         * In no-fill mode, break the output line at the beginning
         * of new input lines except after \c, and nowhere else.
         */

        if (n->flags & NODE_NOFILL) {
                if (n->flags & NODE_LINE &&
                    (p->flags & TERMP_NONEWLINE) == 0)
                        term_newln(p);
                p->flags |= TERMP_BRNEVER;
        } else {
                if (n->flags & NODE_LINE)
                        term_tab_ref(p);
                p->flags &= ~TERMP_BRNEVER;
        }

        if (n->flags & NODE_ID)
                term_tag_write(n, p->line);

        switch (n->type) {
        case ROFFT_TEXT:
                /*
                 * If we have a blank line, output a vertical space.
                 * If we have a space as the first character, break
                 * before printing the line's data.
                 */
                if (*n->string == '\0') {
                        if (p->flags & TERMP_NONEWLINE)
                                term_newln(p);
                        else
                                term_vspace(p);
                        return;
                } else if (*n->string == ' ' && n->flags & NODE_LINE &&
                    (p->flags & TERMP_NONEWLINE) == 0)
                        term_newln(p);
                else if (n->flags & NODE_DELIMC)
                        p->flags |= TERMP_NOSPACE;

                term_word(p, n->string);
                goto out;
        case ROFFT_COMMENT:
                return;
        case ROFFT_EQN:
                if ( ! (n->flags & NODE_LINE))
                        p->flags |= TERMP_NOSPACE;
                term_eqn(p, n->eqn);
                if (n->next != NULL && ! (n->next->flags & NODE_LINE))
                        p->flags |= TERMP_NOSPACE;
                return;
        case ROFFT_TBL:
                if (p->tbl.cols == NULL)
                        term_newln(p);
                term_tbl(p, n->span);
                return;
        default:
                break;
        }

        if (n->tok < ROFF_MAX) {
                roff_term_pre(p, n);
                return;
        }

        act = man_term_act(n->tok);
        if ((act->flags & MAN_NOTEXT) == 0 && n->tok != MAN_SM)
                term_fontrepl(p, TERMFONT_NONE);

        c = 1;
        if (act->pre != NULL)
                c = (*act->pre)(p, mt, n, meta);

        if (c && n->child != NULL)
                print_man_nodelist(p, mt, n->child, meta);

        if (act->post != NULL)
                (*act->post)(p, mt, n, meta);
        if ((act->flags & MAN_NOTEXT) == 0 && n->tok != MAN_SM)
                term_fontrepl(p, TERMFONT_NONE);

out:
        if (n->parent->tok == MAN_HP && n->parent->type == ROFFT_BODY &&
            n->prev == NULL && n->flags & NODE_NOFILL) {
                term_newln(p);
                p->tcol->offset = p->tcol->rmargin;
                p->tcol->rmargin = p->maxrmargin;
        }
        if (n->flags & NODE_EOS)
                p->flags |= TERMP_SENTENCE;
}

static void
print_man_nodelist(DECL_ARGS)
{
        while (n != NULL) {
                print_man_node(p, mt, n, meta);
                n = n->next;
        }
}

static void
print_man_foot(struct termp *p, const struct roff_meta *meta)
{
        char                    *title;
        size_t                   datelen, titlen;  /* In basic units. */

        assert(meta->title != NULL);
        assert(meta->msec != NULL);

        term_fontrepl(p, TERMFONT_NONE);
        if (meta->hasbody)
                term_vspace(p);

        datelen = term_strlen(p, meta->date);
        mandoc_asprintf(&title, "%s(%s)", meta->title, meta->msec);
        titlen = term_strlen(p, title);

        /* Bottom left corner: operating system. */

        p->tcol->offset = 0;
        p->maxrmargin = p->defrmargin;
        p->tcol->rmargin = p->maxrmargin > datelen ?
            (p->maxrmargin + term_len(p, 1) - datelen) / 2 : 0;
        p->trailspace = 1;
        p->flags |= TERMP_NOSPACE | TERMP_NOBREAK;

        if (meta->os)
                term_word(p, meta->os);
        term_flushln(p);

        /* At the bottom in the middle: manual date. */

        p->tcol->offset = p->tcol->rmargin;
        p->tcol->rmargin = p->maxrmargin > titlen ?
            p->maxrmargin - titlen : 0;
        p->flags |= TERMP_NOSPACE;

        term_word(p, meta->date);
        term_flushln(p);

        /* Bottom right corner: manual title and section. */

        p->tcol->offset = p->tcol->rmargin;
        p->tcol->rmargin = p->maxrmargin;
        p->trailspace = 0;
        p->flags &= ~TERMP_NOBREAK;
        p->flags |= TERMP_NOSPACE;

        term_word(p, title);
        term_flushln(p);

        /*
         * Reset the terminal state for more output after the footer:
         * Some output modes, in particular PostScript and PDF, print
         * the header and the footer into a buffer such that it can be
         * reused for multiple output pages, then go on to format the
         * main text.
         */

        p->tcol->offset = 0;
        p->flags = 0;
        free(title);
}

static void
print_man_head(struct termp *p, const struct roff_meta *meta)
{
        const char              *volume;
        char                    *title;
        size_t                   vollen, titlen;  /* In basic units. */

        assert(meta->title);
        assert(meta->msec);

        volume = NULL == meta->vol ? "" : meta->vol;
        vollen = term_strlen(p, volume);

        /* Top left corner: manual title and section. */

        mandoc_asprintf(&title, "%s(%s)", meta->title, meta->msec);
        titlen = term_strlen(p, title);

        p->flags |= TERMP_NOBREAK | TERMP_NOSPACE;
        p->trailspace = 1;
        p->tcol->offset = 0;
        p->tcol->rmargin =
            titlen * 2 + term_len(p, 2) + vollen < p->maxrmargin ?
            (p->maxrmargin - vollen + term_len(p, 1)) / 2 :
            vollen < p->maxrmargin ? p->maxrmargin - vollen : 0;

        term_word(p, title);
        term_flushln(p);

        /* At the top in the middle: manual volume. */

        p->flags |= TERMP_NOSPACE;
        p->tcol->offset = p->tcol->rmargin;
        p->tcol->rmargin = p->tcol->offset + vollen + titlen <
            p->maxrmargin ? p->maxrmargin - titlen : p->maxrmargin;

        term_word(p, volume);
        term_flushln(p);

        /* Top right corner: title and section, again. */

        p->flags &= ~TERMP_NOBREAK;
        p->trailspace = 0;
        if (p->tcol->rmargin + titlen <= p->maxrmargin) {
                p->flags |= TERMP_NOSPACE;
                p->tcol->offset = p->tcol->rmargin;
                p->tcol->rmargin = p->maxrmargin;
                term_word(p, title);
                term_flushln(p);
        }

        p->flags &= ~TERMP_NOSPACE;
        p->tcol->offset = 0;
        p->tcol->rmargin = p->maxrmargin;
        term_vspace(p);
        free(title);
}