locate(1): Bring in some updates/fixes from FreeBSD

[dragonfly.git] / contrib / mdocml / mdoc_argv.c

/*      $Id: mdoc_argv.c,v 1.95 2014/07/06 19:09:00 schwarze Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2012 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 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 <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "mdoc.h"
#include "mandoc.h"
#include "mandoc_aux.h"
#include "libmdoc.h"
#include "libmandoc.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 mdoc *, int, int *,
                                char *, enum argsflag, char **);
static  int              args_checkpunct(const char *, int);
static  int              argv_multi(struct mdoc *, int,
                                struct mdoc_argv *, int *, char *);
static  int              argv_single(struct mdoc *, 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] = {
        { ARGSFL_DELIM, NULL }, /* Ap */
        { 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 }, /* 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 }, /* br */
        { ARGSFL_NONE, NULL }, /* sp */
        { ARGSFL_NONE, NULL }, /* %U */
        { ARGSFL_NONE, NULL }, /* Ta */
        { ARGSFL_NONE, NULL }, /* ll */
};


/*
 * Parse an argument from line text.  This comes in the form of -key
 * [value0...], which may either have a single mandatory value, at least
 * one mandatory value, an optional single value, or no value.
 */
enum margverr
mdoc_argv(struct mdoc *mdoc, int line, enum mdoct tok,
                struct mdoc_arg **v, int *pos, char *buf)
{
        char             *p, sv;
        struct mdoc_argv tmp;
        struct mdoc_arg  *arg;
        const enum mdocargt *ap;

        if ('\0' == buf[*pos])
                return(ARGV_EOLN);
        else if (NULL == (ap = mdocargs[tok].argvs))
                return(ARGV_WORD);
        else if ('-' != buf[*pos])
                return(ARGV_WORD);

        /* Seek to the first unescaped space. */

        p = &buf[++(*pos)];

        assert(*pos > 0);

        for ( ; buf[*pos] ; (*pos)++)
                if (' ' == buf[*pos] && '\\' != buf[*pos - 1])
                        break;

        /*
         * We want to nil-terminate the word to look it up (it's easier
         * that way).  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 necessary).
         */

        if ('\0' != (sv = buf[*pos]))
                buf[(*pos)++] = '\0';

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

        memset(&tmp, 0, sizeof(struct mdoc_argv));

        tmp.line = line;
        tmp.pos = *pos;
        tmp.arg = MDOC_ARG_MAX;

        while (MDOC_ARG_MAX != (tmp.arg = *ap++))
                if (0 == strcmp(p, mdoc_argnames[tmp.arg]))
                        break;

        if (MDOC_ARG_MAX == tmp.arg) {
                /*
                 * The flag was not found.
                 * Restore saved zeroed byte and return as a word.
                 */
                if (sv)
                        buf[*pos - 1] = sv;
                return(ARGV_WORD);
        }

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

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

        switch (argvflags[tmp.arg]) {
        case ARGV_SINGLE:
                if ( ! argv_single(mdoc, line, &tmp, pos, buf))
                        return(ARGV_ERROR);
                break;
        case ARGV_MULTI:
                if ( ! argv_multi(mdoc, line, &tmp, pos, buf))
                        return(ARGV_ERROR);
                break;
        case ARGV_NONE:
                break;
        }

        if (NULL == (arg = *v))
                arg = *v = mandoc_calloc(1, sizeof(struct mdoc_arg));

        arg->argc++;
        arg->argv = mandoc_reallocarray(arg->argv,
            arg->argc, sizeof(struct mdoc_argv));

        memcpy(&arg->argv[(int)arg->argc - 1], &tmp,
            sizeof(struct mdoc_argv));

        return(ARGV_ARG);
}

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_zargs(struct mdoc *mdoc, int line, int *pos, char *buf, char **v)
{

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

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

        fl = mdocargs[tok].flags;

        if (MDOC_It != tok)
                return(args(mdoc, line, pos, buf, fl, v));

        /*
         * 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.
         */

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

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

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

        if ('\0' == buf[*pos]) {
                if (MDOC_PPHRASE & mdoc->flags)
                        return(ARGS_EOLN);
                /*
                 * If we're not in a partial phrase and the flag for
                 * being a phrase literal is still set, the punctuation
                 * is unterminated.
                 */
                if (MDOC_PHRASELIT & mdoc->flags)
                        mandoc_msg(MANDOCERR_ARG_QUOTE,
                            mdoc->parse, line, *pos, NULL);

                mdoc->flags &= ~MDOC_PHRASELIT;
                return(ARGS_EOLN);
        }

        *v = &buf[*pos];

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

        /*
         * First handle TABSEP items, restricted to `Bl -column'.  This
         * ignores conventional token parsing and instead uses tabs or
         * `Ta' macros to separate phrases.  Phrases are parsed again
         * for arguments at a later phase.
         */

        if (ARGSFL_TABSEP == fl) {
                /* Scan ahead to tab (can't be escaped). */
                p = strchr(*v, '\t');
                pp = NULL;

                /* Scan ahead to unescaped `Ta'. */
                if ( ! (MDOC_PHRASELIT & mdoc->flags))
                        for (pp = *v; ; pp++) {
                                if (NULL == (pp = strstr(pp, "Ta")))
                                        break;
                                if (pp > *v && ' ' != *(pp - 1))
                                        continue;
                                if (' ' == *(pp + 2) || '\0' == *(pp + 2))
                                        break;
                        }

                /* By default, assume a phrase. */
                rc = ARGS_PHRASE;

                /*
                 * Adjust new-buffer position to be beyond delimiter
                 * mark (e.g., Ta -> end + 2).
                 */
                if (p && pp) {
                        *pos += pp < p ? 2 : 1;
                        rc = pp < p ? ARGS_PHRASE : ARGS_PPHRASE;
                        p = pp < p ? pp : p;
                } else if (p && ! pp) {
                        rc = ARGS_PPHRASE;
                        *pos += 1;
                } else if (pp && ! p) {
                        p = pp;
                        *pos += 2;
                } else {
                        rc = ARGS_PEND;
                        p = strchr(*v, 0);
                }

                /* Whitespace check for eoln case... */
                if ('\0' == *p && ' ' == *(p - 1))
                        mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
                            line, *pos, NULL);

                *pos += (int)(p - *v);

                /* Strip delimiter's preceding whitespace. */
                pp = p - 1;
                while (pp > *v && ' ' == *pp) {
                        if (pp > *v && '\\' == *(pp - 1))
                                break;
                        pp--;
                }
                *(pp + 1) = 0;

                /* Strip delimiter's proceeding whitespace. */
                for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
                        /* Skip ahead. */ ;

                return(rc);
        }

        /*
         * 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_PHRASELIT & mdoc->flags || '\"' == buf[*pos]) {
                if ( ! (MDOC_PHRASELIT & mdoc->flags))
                        *v = &buf[++(*pos)];

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

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

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

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

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

                return(ARGS_QWORD);
        }

        p = &buf[*pos];
        *v = mandoc_getarg(mdoc->parse, &p, line, pos);

        return(ARGS_WORD);
}

/*
 * 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 int
argv_multi(struct mdoc *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 (ARGS_ERROR == ac)
                        return(0);
                else if (ARGS_EOLN == ac)
                        break;

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

                v->value[(int)v->sz] = mandoc_strdup(p);
        }

        return(1);
}

static int
argv_single(struct mdoc *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 (ARGS_ERROR == ac)
                return(0);
        if (ARGS_EOLN == ac)
                return(1);

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

        return(1);
}