/*      $OpenBSD: mdoc_argv.c,v 1.76 2019/07/11 16:56:52 schwarze Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2012, 2014-2019 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 <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "mdoc.h"
#include "libmandoc.h"
#include "roff_int.h"
#include "libmdoc.h"

#define MULTI_STEP       5 /* pre-allocate argument values */
#define DELIMSZ          6 /* max possible size of a delimiter */

enum    argsflag {
        ARGSFL_NONE = 0,
        ARGSFL_DELIM, /* handle delimiters of [[::delim::][ ]+]+ */
        ARGSFL_TABSEP /* handle tab/`Ta' separated phrases */
};

enum    argvflag {
        ARGV_NONE, /* no args to flag (e.g., -split) */
        ARGV_SINGLE, /* one arg to flag (e.g., -file xxx)  */
        ARGV_MULTI /* multiple args (e.g., -column xxx yyy) */
};

struct  mdocarg {
        enum argsflag    flags;
        const enum mdocargt *argvs;
};

static  void             argn_free(struct mdoc_arg *, int);
static  enum margserr    args(struct roff_man *, int, int *,
                                char *, enum argsflag, char **);
static  int              args_checkpunct(const char *, int);
static  void             argv_multi(struct roff_man *, int,
                                struct mdoc_argv *, int *, char *);
static  void             argv_single(struct roff_man *, int,
                                struct mdoc_argv *, int *, char *);

static  const enum argvflag argvflags[MDOC_ARG_MAX] = {
        ARGV_NONE,      /* MDOC_Split */
        ARGV_NONE,      /* MDOC_Nosplit */
        ARGV_NONE,      /* MDOC_Ragged */
        ARGV_NONE,      /* MDOC_Unfilled */
        ARGV_NONE,      /* MDOC_Literal */
        ARGV_SINGLE,    /* MDOC_File */
        ARGV_SINGLE,    /* MDOC_Offset */
        ARGV_NONE,      /* MDOC_Bullet */
        ARGV_NONE,      /* MDOC_Dash */
        ARGV_NONE,      /* MDOC_Hyphen */
        ARGV_NONE,      /* MDOC_Item */
        ARGV_NONE,      /* MDOC_Enum */
        ARGV_NONE,      /* MDOC_Tag */
        ARGV_NONE,      /* MDOC_Diag */
        ARGV_NONE,      /* MDOC_Hang */
        ARGV_NONE,      /* MDOC_Ohang */
        ARGV_NONE,      /* MDOC_Inset */
        ARGV_MULTI,     /* MDOC_Column */
        ARGV_SINGLE,    /* MDOC_Width */
        ARGV_NONE,      /* MDOC_Compact */
        ARGV_NONE,      /* MDOC_Std */
        ARGV_NONE,      /* MDOC_Filled */
        ARGV_NONE,      /* MDOC_Words */
        ARGV_NONE,      /* MDOC_Emphasis */
        ARGV_NONE,      /* MDOC_Symbolic */
        ARGV_NONE       /* MDOC_Symbolic */
};

static  const enum mdocargt args_Ex[] = {
        MDOC_Std,
        MDOC_ARG_MAX
};

static  const enum mdocargt args_An[] = {
        MDOC_Split,
        MDOC_Nosplit,
        MDOC_ARG_MAX
};

static  const enum mdocargt args_Bd[] = {
        MDOC_Ragged,
        MDOC_Unfilled,
        MDOC_Filled,
        MDOC_Literal,
        MDOC_File,
        MDOC_Offset,
        MDOC_Compact,
        MDOC_Centred,
        MDOC_ARG_MAX
};

static  const enum mdocargt args_Bf[] = {
        MDOC_Emphasis,
        MDOC_Literal,
        MDOC_Symbolic,
        MDOC_ARG_MAX
};

static  const enum mdocargt args_Bk[] = {
        MDOC_Words,
        MDOC_ARG_MAX
};

static  const enum mdocargt args_Bl[] = {
        MDOC_Bullet,
        MDOC_Dash,
        MDOC_Hyphen,
        MDOC_Item,
        MDOC_Enum,
        MDOC_Tag,
        MDOC_Diag,
        MDOC_Hang,
        MDOC_Ohang,
        MDOC_Inset,
        MDOC_Column,
        MDOC_Width,
        MDOC_Offset,
        MDOC_Compact,
        MDOC_Nested,
        MDOC_ARG_MAX
};

static  const struct mdocarg mdocargs[MDOC_MAX - MDOC_Dd] = {
        { ARGSFL_NONE, NULL }, /* Dd */
        { ARGSFL_NONE, NULL }, /* Dt */
        { ARGSFL_NONE, NULL }, /* Os */
        { ARGSFL_NONE, NULL }, /* Sh */
        { ARGSFL_NONE, NULL }, /* Ss */
        { ARGSFL_NONE, NULL }, /* Pp */
        { ARGSFL_DELIM, NULL }, /* D1 */
        { ARGSFL_DELIM, NULL }, /* Dl */
        { ARGSFL_NONE, args_Bd }, /* Bd */
        { ARGSFL_NONE, NULL }, /* Ed */
        { ARGSFL_NONE, args_Bl }, /* Bl */
        { ARGSFL_NONE, NULL }, /* El */
        { ARGSFL_NONE, NULL }, /* It */
        { ARGSFL_DELIM, NULL }, /* Ad */
        { ARGSFL_DELIM, args_An }, /* An */
        { ARGSFL_DELIM, NULL }, /* Ap */
        { ARGSFL_DELIM, NULL }, /* Ar */
        { ARGSFL_DELIM, NULL }, /* Cd */
        { ARGSFL_DELIM, NULL }, /* Cm */
        { ARGSFL_DELIM, NULL }, /* Dv */
        { ARGSFL_DELIM, NULL }, /* Er */
        { ARGSFL_DELIM, NULL }, /* Ev */
        { ARGSFL_NONE, args_Ex }, /* Ex */
        { ARGSFL_DELIM, NULL }, /* Fa */
        { ARGSFL_NONE, NULL }, /* Fd */
        { ARGSFL_DELIM, NULL }, /* Fl */
        { ARGSFL_DELIM, NULL }, /* Fn */
        { ARGSFL_DELIM, NULL }, /* Ft */
        { ARGSFL_DELIM, NULL }, /* Ic */
        { ARGSFL_DELIM, NULL }, /* In */
        { ARGSFL_DELIM, NULL }, /* Li */
        { ARGSFL_NONE, NULL }, /* Nd */
        { ARGSFL_DELIM, NULL }, /* Nm */
        { ARGSFL_DELIM, NULL }, /* Op */
        { ARGSFL_DELIM, NULL }, /* Ot */
        { ARGSFL_DELIM, NULL }, /* Pa */
        { ARGSFL_NONE, args_Ex }, /* Rv */
        { ARGSFL_DELIM, NULL }, /* St */
        { ARGSFL_DELIM, NULL }, /* Va */
        { ARGSFL_DELIM, NULL }, /* Vt */
        { ARGSFL_DELIM, NULL }, /* Xr */
        { ARGSFL_NONE, NULL }, /* %A */
        { ARGSFL_NONE, NULL }, /* %B */
        { ARGSFL_NONE, NULL }, /* %D */
        { ARGSFL_NONE, NULL }, /* %I */
        { ARGSFL_NONE, NULL }, /* %J */
        { ARGSFL_NONE, NULL }, /* %N */
        { ARGSFL_NONE, NULL }, /* %O */
        { ARGSFL_NONE, NULL }, /* %P */
        { ARGSFL_NONE, NULL }, /* %R */
        { ARGSFL_NONE, NULL }, /* %T */
        { ARGSFL_NONE, NULL }, /* %V */
        { ARGSFL_DELIM, NULL }, /* Ac */
        { ARGSFL_NONE, NULL }, /* Ao */
        { ARGSFL_DELIM, NULL }, /* Aq */
        { ARGSFL_DELIM, NULL }, /* At */
        { ARGSFL_DELIM, NULL }, /* Bc */
        { ARGSFL_NONE, args_Bf }, /* Bf */
        { ARGSFL_NONE, NULL }, /* Bo */
        { ARGSFL_DELIM, NULL }, /* Bq */
        { ARGSFL_DELIM, NULL }, /* Bsx */
        { ARGSFL_DELIM, NULL }, /* Bx */
        { ARGSFL_NONE, NULL }, /* Db */
        { ARGSFL_DELIM, NULL }, /* Dc */
        { ARGSFL_NONE, NULL }, /* Do */
        { ARGSFL_DELIM, NULL }, /* Dq */
        { ARGSFL_DELIM, NULL }, /* Ec */
        { ARGSFL_NONE, NULL }, /* Ef */
        { ARGSFL_DELIM, NULL }, /* Em */
        { ARGSFL_NONE, NULL }, /* Eo */
        { ARGSFL_DELIM, NULL }, /* Fx */
        { ARGSFL_DELIM, NULL }, /* Ms */
        { ARGSFL_DELIM, NULL }, /* No */
        { ARGSFL_DELIM, NULL }, /* Ns */
        { ARGSFL_DELIM, NULL }, /* Nx */
        { ARGSFL_DELIM, NULL }, /* Ox */
        { ARGSFL_DELIM, NULL }, /* Pc */
        { ARGSFL_DELIM, NULL }, /* Pf */
        { ARGSFL_NONE, NULL }, /* Po */
        { ARGSFL_DELIM, NULL }, /* Pq */
        { ARGSFL_DELIM, NULL }, /* Qc */
        { ARGSFL_DELIM, NULL }, /* Ql */
        { ARGSFL_NONE, NULL }, /* Qo */
        { ARGSFL_DELIM, NULL }, /* Qq */
        { ARGSFL_NONE, NULL }, /* Re */
        { ARGSFL_NONE, NULL }, /* Rs */
        { ARGSFL_DELIM, NULL }, /* Sc */
        { ARGSFL_NONE, NULL }, /* So */
        { ARGSFL_DELIM, NULL }, /* Sq */
        { ARGSFL_NONE, NULL }, /* Sm */
        { ARGSFL_DELIM, NULL }, /* Sx */
        { ARGSFL_DELIM, NULL }, /* Sy */
        { ARGSFL_DELIM, NULL }, /* Tn */
        { ARGSFL_DELIM, NULL }, /* Ux */
        { ARGSFL_DELIM, NULL }, /* Xc */
        { ARGSFL_NONE, NULL }, /* Xo */
        { ARGSFL_NONE, NULL }, /* Fo */
        { ARGSFL_DELIM, NULL }, /* Fc */
        { ARGSFL_NONE, NULL }, /* Oo */
        { ARGSFL_DELIM, NULL }, /* Oc */
        { ARGSFL_NONE, args_Bk }, /* Bk */
        { ARGSFL_NONE, NULL }, /* Ek */
        { ARGSFL_NONE, NULL }, /* Bt */
        { ARGSFL_NONE, NULL }, /* Hf */
        { ARGSFL_DELIM, NULL }, /* Fr */
        { ARGSFL_NONE, NULL }, /* Ud */
        { ARGSFL_DELIM, NULL }, /* Lb */
        { ARGSFL_NONE, NULL }, /* Lp */
        { ARGSFL_DELIM, NULL }, /* Lk */
        { ARGSFL_DELIM, NULL }, /* Mt */
        { ARGSFL_DELIM, NULL }, /* Brq */
        { ARGSFL_NONE, NULL }, /* Bro */
        { ARGSFL_DELIM, NULL }, /* Brc */
        { ARGSFL_NONE, NULL }, /* %C */
        { ARGSFL_NONE, NULL }, /* Es */
        { ARGSFL_DELIM, NULL }, /* En */
        { ARGSFL_DELIM, NULL }, /* Dx */
        { ARGSFL_NONE, NULL }, /* %Q */
        { ARGSFL_NONE, NULL }, /* %U */
        { ARGSFL_NONE, NULL }, /* Ta */
};


/*
 * Parse flags and their arguments from the input line.
 * These come in the form -flag [argument ...].
 * Some flags take no argument, some one, some multiple.
 */
void
mdoc_argv(struct roff_man *mdoc, int line, enum roff_tok tok,
        struct mdoc_arg **reta, int *pos, char *buf)
{
        struct mdoc_argv          tmpv;
        struct mdoc_argv        **retv;
        const enum mdocargt      *argtable;
        char                     *argname;
        int                       ipos, retc;
        char                      savechar;

        *reta = NULL;

        /* Which flags does this macro support? */

        assert(tok >= MDOC_Dd && tok < MDOC_MAX);
        argtable = mdocargs[tok - MDOC_Dd].argvs;
        if (argtable == NULL)
                return;

        /* Loop over the flags on the input line. */

        ipos = *pos;
        while (buf[ipos] == '-') {

                /* Seek to the first unescaped space. */

                for (argname = buf + ++ipos; buf[ipos] != '\0'; ipos++)
                        if (buf[ipos] == ' ' && buf[ipos - 1] != '\\')
                                break;

                /*
                 * We want to nil-terminate the word to look it up.
                 * But we may not have a flag, in which case we need
                 * to restore the line as-is.  So keep around the
                 * stray byte, which we'll reset upon exiting.
                 */

                if ((savechar = buf[ipos]) != '\0')
                        buf[ipos++] = '\0';

                /*
                 * Now look up the word as a flag.  Use temporary
                 * storage that we'll copy into the node's flags.
                 */

                while ((tmpv.arg = *argtable++) != MDOC_ARG_MAX)
                        if ( ! strcmp(argname, mdoc_argnames[tmpv.arg]))
                                break;

                /* If it isn't a flag, restore the saved byte. */

                if (tmpv.arg == MDOC_ARG_MAX) {
                        if (savechar != '\0')
                                buf[ipos - 1] = savechar;
                        break;
                }

                /* Read to the next word (the first argument). */

                while (buf[ipos] == ' ')
                        ipos++;

                /* Parse the arguments of the flag. */

                tmpv.line  = line;
                tmpv.pos   = *pos;
                tmpv.sz    = 0;
                tmpv.value = NULL;

                switch (argvflags[tmpv.arg]) {
                case ARGV_SINGLE:
                        argv_single(mdoc, line, &tmpv, &ipos, buf);
                        break;
                case ARGV_MULTI:
                        argv_multi(mdoc, line, &tmpv, &ipos, buf);
                        break;
                case ARGV_NONE:
                        break;
                }

                /* Append to the return values. */

                if (*reta == NULL)
                        *reta = mandoc_calloc(1, sizeof(**reta));

                retc = ++(*reta)->argc;
                retv = &(*reta)->argv;
                *retv = mandoc_reallocarray(*retv, retc, sizeof(**retv));
                memcpy(*retv + retc - 1, &tmpv, sizeof(**retv));

                /* Prepare for parsing the next flag. */

                *pos = ipos;
                argtable = mdocargs[tok - MDOC_Dd].argvs;
        }
}

void
mdoc_argv_free(struct mdoc_arg *p)
{
        int              i;

        if (NULL == p)
                return;

        if (p->refcnt) {
                --(p->refcnt);
                if (p->refcnt)
                        return;
        }
        assert(p->argc);

        for (i = (int)p->argc - 1; i >= 0; i--)
                argn_free(p, i);

        free(p->argv);
        free(p);
}

static void
argn_free(struct mdoc_arg *p, int iarg)
{
        struct mdoc_argv *arg;
        int               j;

        arg = &p->argv[iarg];

        if (arg->sz && arg->value) {
                for (j = (int)arg->sz - 1; j >= 0; j--)
                        free(arg->value[j]);
                free(arg->value);
        }

        for (--p->argc; iarg < (int)p->argc; iarg++)
                p->argv[iarg] = p->argv[iarg+1];
}

enum margserr
mdoc_args(struct roff_man *mdoc, int line, int *pos,
        char *buf, enum roff_tok tok, char **v)
{
        struct roff_node *n;
        enum argsflag     fl;

        fl = tok == TOKEN_NONE ? ARGSFL_NONE : mdocargs[tok - MDOC_Dd].flags;

        /*
         * We know that we're in an `It', so it's reasonable to expect
         * us to be sitting in a `Bl'.  Someday this may not be the case
         * (if we allow random `It's sitting out there), so provide a
         * safe fall-back into the default behaviour.
         */

        if (tok == MDOC_It) {
                for (n = mdoc->last; n != NULL; n = n->parent) {
                        if (n->tok != MDOC_Bl)
                                continue;
                        if (n->norm->Bl.type == LIST_column)
                                fl = ARGSFL_TABSEP;
                        break;
                }
        }

        return args(mdoc, line, pos, buf, fl, v);
}

static enum margserr
args(struct roff_man *mdoc, int line, int *pos,
                char *buf, enum argsflag fl, char **v)
{
        char            *p;
        char            *v_local;
        int              pairs;

        if (buf[*pos] == '\0') {
                if (mdoc->flags & MDOC_PHRASELIT &&
                    ! (mdoc->flags & MDOC_PHRASE)) {
                        mandoc_msg(MANDOCERR_ARG_QUOTE, line, *pos, NULL);
                        mdoc->flags &= ~MDOC_PHRASELIT;
                }
                mdoc->flags &= ~MDOC_PHRASEQL;
                return ARGS_EOLN;
        }

        if (v == NULL)
                v = &v_local;
        *v = buf + *pos;

        if (fl == ARGSFL_DELIM && args_checkpunct(buf, *pos))
                return ARGS_PUNCT;

        /*
         * Tabs in `It' lines in `Bl -column' can't be escaped.
         * Phrases are reparsed for `Ta' and other macros later.
         */

        if (fl == ARGSFL_TABSEP) {
                if ((p = strchr(*v, '\t')) != NULL) {

                        /*
                         * Words right before and right after
                         * tab characters are not parsed,
                         * unless there is a blank in between.
                         */

                        if (p > buf && p[-1] != ' ')
                                mdoc->flags |= MDOC_PHRASEQL;
                        if (p[1] != ' ')
                                mdoc->flags |= MDOC_PHRASEQN;

                        /*
                         * One or more blanks after a tab cause
                         * one leading blank in the next column.
                         * So skip all but one of them.
                         */

                        *pos += (int)(p - *v) + 1;
                        while (buf[*pos] == ' ' && buf[*pos + 1] == ' ')
                                (*pos)++;

                        /*
                         * A tab at the end of an input line
                         * switches to the next column.
                         */

                        if (buf[*pos] == '\0' || buf[*pos + 1] == '\0')
                                mdoc->flags |= MDOC_PHRASEQN;
                } else {
                        p = strchr(*v, '\0');
                        if (p[-1] == ' ')
                                mandoc_msg(MANDOCERR_SPACE_EOL,
                                    line, *pos, NULL);
                        *pos += (int)(p - *v);
                }

                /* Skip any trailing blank characters. */
                while (p > *v && p[-1] == ' ' &&
                    (p - 1 == *v || p[-2] != '\\'))
                        p--;
                *p = '\0';

                return ARGS_PHRASE;
        }

        /*
         * Process a quoted literal.  A quote begins with a double-quote
         * and ends with a double-quote NOT preceded by a double-quote.
         * NUL-terminate the literal in place.
         * Collapse pairs of quotes inside quoted literals.
         * Whitespace is NOT involved in literal termination.
         */

        if (mdoc->flags & MDOC_PHRASELIT ||
            (mdoc->flags & MDOC_PHRASE && buf[*pos] == '\"')) {
                if ((mdoc->flags & MDOC_PHRASELIT) == 0) {
                        *v = &buf[++(*pos)];
                        mdoc->flags |= MDOC_PHRASELIT;
                }
                pairs = 0;
                for ( ; buf[*pos]; (*pos)++) {
                        /* Move following text left after quoted quotes. */
                        if (pairs)
                                buf[*pos - pairs] = buf[*pos];
                        if ('\"' != buf[*pos])
                                continue;
                        /* Unquoted quotes end quoted args. */
                        if ('\"' != buf[*pos + 1])
                                break;
                        /* Quoted quotes collapse. */
                        pairs++;
                        (*pos)++;
                }
                if (pairs)
                        buf[*pos - pairs] = '\0';

                if (buf[*pos] == '\0') {
                        if ( ! (mdoc->flags & MDOC_PHRASE))
                                mandoc_msg(MANDOCERR_ARG_QUOTE,
                                    line, *pos, NULL);
                        return ARGS_WORD;
                }

                mdoc->flags &= ~MDOC_PHRASELIT;
                buf[(*pos)++] = '\0';

                if ('\0' == buf[*pos])
                        return ARGS_WORD;

                while (' ' == buf[*pos])
                        (*pos)++;

                if ('\0' == buf[*pos])
                        mandoc_msg(MANDOCERR_SPACE_EOL, line, *pos, NULL);

                return ARGS_WORD;
        }

        p = &buf[*pos];
        *v = roff_getarg(mdoc->roff, &p, line, pos);
        if (v == &v_local)
                free(*v);

        /*
         * After parsing the last word in this phrase,
         * tell lookup() whether or not to interpret it.
         */

        if (*p == '\0' && mdoc->flags & MDOC_PHRASEQL) {
                mdoc->flags &= ~MDOC_PHRASEQL;
                mdoc->flags |= MDOC_PHRASEQF;
        }
        return ARGS_ALLOC;
}

/*
 * Check if the string consists only of space-separated closing
 * delimiters.  This is a bit of a dance: the first must be a close
 * delimiter, but it may be followed by middle delimiters.  Arbitrary
 * whitespace may separate these tokens.
 */
static int
args_checkpunct(const char *buf, int i)
{
        int              j;
        char             dbuf[DELIMSZ];
        enum mdelim      d;

        /* First token must be a close-delimiter. */

        for (j = 0; buf[i] && ' ' != buf[i] && j < DELIMSZ; j++, i++)
                dbuf[j] = buf[i];

        if (DELIMSZ == j)
                return 0;

        dbuf[j] = '\0';
        if (DELIM_CLOSE != mdoc_isdelim(dbuf))
                return 0;

        while (' ' == buf[i])
                i++;

        /* Remaining must NOT be open/none. */

        while (buf[i]) {
                j = 0;
                while (buf[i] && ' ' != buf[i] && j < DELIMSZ)
                        dbuf[j++] = buf[i++];

                if (DELIMSZ == j)
                        return 0;

                dbuf[j] = '\0';
                d = mdoc_isdelim(dbuf);
                if (DELIM_NONE == d || DELIM_OPEN == d)
                        return 0;

                while (' ' == buf[i])
                        i++;
        }

        return '\0' == buf[i];
}

static void
argv_multi(struct roff_man *mdoc, int line,
                struct mdoc_argv *v, int *pos, char *buf)
{
        enum margserr    ac;
        char            *p;

        for (v->sz = 0; ; v->sz++) {
                if (buf[*pos] == '-')
                        break;
                ac = args(mdoc, line, pos, buf, ARGSFL_NONE, &p);
                if (ac == ARGS_EOLN)
                        break;

                if (v->sz % MULTI_STEP == 0)
                        v->value = mandoc_reallocarray(v->value,
                            v->sz + MULTI_STEP, sizeof(char *));

                if (ac != ARGS_ALLOC)
                        p = mandoc_strdup(p);
                v->value[(int)v->sz] = p;
        }
}

static void
argv_single(struct roff_man *mdoc, int line,
                struct mdoc_argv *v, int *pos, char *buf)
{
        enum margserr    ac;
        char            *p;

        ac = args(mdoc, line, pos, buf, ARGSFL_NONE, &p);
        if (ac == ARGS_EOLN)
                return;

        if (ac != ARGS_ALLOC)
                p = mandoc_strdup(p);

        v->sz = 1;
        v->value = mandoc_malloc(sizeof(char *));
        v->value[0] = p;
}