mdoc.c

   1 /* $Id: mdoc.c,v 1.16 2009/01/05 14:14:04 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <err.h>
  22 #include <stdarg.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include "private.h"
  28
  29 const   char *const __mdoc_macronames[MDOC_MAX] = {
  30         "\\\"",         "Dd",           "Dt",           "Os",
  31         "Sh",           "Ss",           "Pp",           "D1",
  32         "Dl",           "Bd",           "Ed",           "Bl",
  33         "El",           "It",           "Ad",           "An",
  34         "Ar",           "Cd",           "Cm",           "Dv",
  35         "Er",           "Ev",           "Ex",           "Fa",
  36         "Fd",           "Fl",           "Fn",           "Ft",
  37         "Ic",           "In",           "Li",           "Nd",
  38         "Nm",           "Op",           "Ot",           "Pa",
  39         "Rv",           "St",           "Va",           "Vt",
  40         /* LINTED */
  41         "Xr",           "\%A",          "\%B",          "\%D",
  42         /* LINTED */
  43         "\%I",          "\%J",          "\%N",          "\%O",
  44         /* LINTED */
  45         "\%P",          "\%R",          "\%T",          "\%V",
  46         "Ac",           "Ao",           "Aq",           "At",
  47         "Bc",           "Bf",           "Bo",           "Bq",
  48         "Bsx",          "Bx",           "Db",           "Dc",
  49         "Do",           "Dq",           "Ec",           "Ef",
  50         "Em",           "Eo",           "Fx",           "Ms",
  51         "No",           "Ns",           "Nx",           "Ox",
  52         "Pc",           "Pf",           "Po",           "Pq",
  53         "Qc",           "Ql",           "Qo",           "Qq",
  54         "Re",           "Rs",           "Sc",           "So",
  55         "Sq",           "Sm",           "Sx",           "Sy",
  56         "Tn",           "Ux",           "Xc",           "Xo",
  57         "Fo",           "Fc",           "Oo",           "Oc",
  58         "Bk",           "Ek",           "Bt",           "Hf",
  59         "Fr",           "Ud",
  60         };
  61
  62 const   char *const __mdoc_argnames[MDOC_ARG_MAX] = {
  63         "split",                "nosplit",              "ragged",
  64         "unfilled",             "literal",              "file",
  65         "offset",               "bullet",               "dash",
  66         "hyphen",               "item",                 "enum",
  67         "tag",                  "diag",                 "hang",
  68         "ohang",                "inset",                "column",
  69         "width",                "compact",              "std",
  70         "p1003.1-88",           "p1003.1-90",           "p1003.1-96",
  71         "p1003.1-2001",         "p1003.1-2004",         "p1003.1",
  72         "p1003.1b",             "p1003.1b-93",          "p1003.1c-95",
  73         "p1003.1g-2000",        "p1003.2-92",           "p1387.2-95",
  74         "p1003.2",              "p1387.2",              "isoC-90",
  75         "isoC-amd1",            "isoC-tcor1",           "isoC-tcor2",
  76         "isoC-99",              "ansiC",                "ansiC-89",
  77         "ansiC-99",             "ieee754",              "iso8802-3",
  78         "xpg3",                 "xpg4",                 "xpg4.2",
  79         "xpg4.3",               "xbd5",                 "xcu5",
  80         "xsh5",                 "xns5",                 "xns5.2d2.0",
  81         "xcurses4.2",           "susv2",                "susv3",
  82         "svid4",                "filled",               "words",
  83         "emphasis",             "symbolic",
  84         };
  85
  86 const   struct mdoc_macro __mdoc_macros[MDOC_MAX] = {
  87         { NULL, 0 }, /* \" */
  88         { NULL, MDOC_PROLOGUE }, /* Dd */
  89         { NULL, MDOC_PROLOGUE }, /* Dt */
  90         { NULL, MDOC_PROLOGUE }, /* Os */
  91         { macro_scoped, 0 }, /* Sh */
  92         { macro_scoped, 0 }, /* Ss */
  93         { macro_text, 0 }, /* Pp */
  94         { macro_scoped_line, 0 }, /* D1 */
  95         { macro_scoped_line, 0 }, /* Dl */
  96         { macro_scoped, MDOC_EXPLICIT }, /* Bd */
  97         { macro_close_explicit, 0 }, /* Ed */
  98         { macro_scoped, MDOC_EXPLICIT }, /* Bl */
  99         { macro_close_explicit, 0 }, /* El */
 100         { NULL, 0 }, /* It */
 101         { macro_text, MDOC_CALLABLE }, /* Ad */
 102         { macro_constant, 0 }, /* An */
 103         { macro_text, MDOC_CALLABLE }, /* Ar */
 104         { macro_constant, MDOC_QUOTABLE }, /* Cd */
 105         { macro_text, MDOC_CALLABLE }, /* Cm */
 106         { macro_text, MDOC_CALLABLE }, /* Dv */
 107         { macro_text, MDOC_CALLABLE }, /* Er */
 108         { macro_text, MDOC_CALLABLE }, /* Ev */
 109         { macro_constant, 0 }, /* Ex */
 110         { macro_text, MDOC_CALLABLE }, /* Fa */
 111         { macro_constant, 0 }, /* Fd */
 112         { macro_text, MDOC_CALLABLE }, /* Fl */
 113         { macro_text, MDOC_CALLABLE | MDOC_QUOTABLE }, /* Fn */
 114         { macro_text, 0 }, /* Ft */
 115         { macro_text, MDOC_CALLABLE }, /* Ic */
 116         { macro_constant, 0 }, /* In */
 117         { macro_text, MDOC_CALLABLE }, /* Li */
 118         { macro_constant, 0 }, /* Nd */
 119         { NULL, 0 }, /* Nm */
 120         { macro_scoped_line, MDOC_CALLABLE }, /* Op */
 121         { macro_obsolete, 0 }, /* Ot */
 122         { macro_text, MDOC_CALLABLE }, /* Pa */
 123         { macro_constant, 0 }, /* Rv */
 124         { macro_constant, 0 }, /* St */
 125         { macro_text, MDOC_CALLABLE }, /* Va */
 126         { macro_text, MDOC_CALLABLE }, /* Vt */
 127         { macro_text, MDOC_CALLABLE }, /* Xr */
 128         { macro_constant, MDOC_QUOTABLE }, /* %A */
 129         { macro_constant, MDOC_QUOTABLE }, /* %B */
 130         { macro_constant, MDOC_QUOTABLE }, /* %D */
 131         { macro_constant, MDOC_QUOTABLE }, /* %I */
 132         { macro_constant, MDOC_QUOTABLE }, /* %J */
 133         { macro_constant, MDOC_QUOTABLE }, /* %N */
 134         { macro_constant, MDOC_QUOTABLE }, /* %O */
 135         { macro_constant, MDOC_QUOTABLE }, /* %P */
 136         { macro_constant, MDOC_QUOTABLE }, /* %R */
 137         { macro_constant, MDOC_QUOTABLE }, /* %T */
 138         { macro_constant, MDOC_QUOTABLE }, /* %V */
 139         { NULL, 0 }, /* Ac */
 140         { NULL, 0 }, /* Ao */
 141         { macro_scoped_line, MDOC_CALLABLE }, /* Aq */
 142         { macro_constant, 0 }, /* At */
 143         { NULL, 0 }, /* Bc */
 144         { macro_scoped, MDOC_EXPLICIT }, /* Bf */
 145         { NULL, 0 }, /* Bo */
 146         { macro_scoped_line, MDOC_CALLABLE }, /* Bq */
 147         { macro_constant_delimited, 0 }, /* Bsx */
 148         { macro_constant_delimited, 0 }, /* Bx */
 149         { macro_constant, 0 }, /* Db */
 150         { NULL, 0 }, /* Dc */
 151         { NULL, 0 }, /* Do */
 152         { macro_scoped_line, MDOC_CALLABLE }, /* Dq */
 153         { NULL, 0 }, /* Ec */
 154         { macro_close_explicit, 0 }, /* Ef */
 155         { macro_text, MDOC_CALLABLE }, /* Em */
 156         { NULL, 0 }, /* Eo */
 157         { macro_constant_delimited, 0 }, /* Fx */
 158         { macro_text, 0 }, /* Ms */
 159         { macro_constant_delimited, MDOC_CALLABLE }, /* No */
 160         { macro_constant_delimited, MDOC_CALLABLE }, /* Ns */
 161         { macro_constant_delimited, 0 }, /* Nx */
 162         { macro_constant_delimited, 0 }, /* Ox */
 163         { NULL, 0 }, /* Pc */
 164         { macro_constant, 0 }, /* Pf */
 165         { NULL, 0 }, /* Po */
 166         { macro_scoped_line, MDOC_CALLABLE }, /* Pq */
 167         { NULL, 0 }, /* Qc */
 168         { macro_scoped_line, MDOC_CALLABLE }, /* Ql */
 169         { NULL, 0 }, /* Qo */
 170         { macro_scoped_line, MDOC_CALLABLE }, /* Qq */
 171         { macro_scoped, MDOC_EXPLICIT }, /* Re */
 172         { macro_scoped, MDOC_EXPLICIT }, /* Rs */
 173         { NULL, 0 }, /* Sc */
 174         { NULL, 0 }, /* So */
 175         { macro_scoped_line, MDOC_CALLABLE }, /* Sq */
 176         { macro_constant, 0 }, /* Sm */
 177         { macro_text, MDOC_CALLABLE }, /* Sx */
 178         { macro_text, MDOC_CALLABLE }, /* Sy */
 179         { macro_text, MDOC_CALLABLE }, /* Tn */
 180         { macro_constant_delimited, 0 }, /* Ux */
 181         { NULL, 0 }, /* Xc */
 182         { NULL, 0 }, /* Xo */
 183         { NULL, 0 }, /* Fo */
 184         { NULL, 0 }, /* Fc */
 185         { NULL, 0 }, /* Oo */
 186         { NULL, 0 }, /* Oc */
 187         { NULL, 0 }, /* Bk */
 188         { NULL, 0 }, /* Ek */
 189         { macro_constant, 0 }, /* Bt */
 190         { macro_constant, 0 }, /* Hf */
 191         { macro_obsolete, 0 }, /* Fr */
 192         { macro_constant, 0 }, /* Ud */
 193 };
 194
 195 const   char * const *mdoc_macronames = __mdoc_macronames;
 196 const   char * const *mdoc_argnames = __mdoc_argnames;
 197 const   struct mdoc_macro * const mdoc_macros = __mdoc_macros;
 198
 199
 200 static  struct mdoc_arg  *argdup(size_t, const struct mdoc_arg *);
 201 static  void              argfree(size_t, struct mdoc_arg *);
 202 static  void              argcpy(struct mdoc_arg *,
 203                                 const struct mdoc_arg *);
 204
 205 static  void              mdoc_node_freelist(struct mdoc_node *);
 206 static  void              mdoc_node_append(struct mdoc *, int,
 207                                 struct mdoc_node *);
 208 static  void              mdoc_elem_free(struct mdoc_elem *);
 209 static  void              mdoc_text_free(struct mdoc_text *);
 210
 211
 212 const struct mdoc_node *
 213 mdoc_result(struct mdoc *mdoc)
 214 {
 215
 216         return(mdoc->first);
 217 }
 218
 219
 220 void
 221 mdoc_free(struct mdoc *mdoc)
 222 {
 223
 224         if (mdoc->first)
 225                 mdoc_node_freelist(mdoc->first);
 226         if (mdoc->htab)
 227                 mdoc_tokhash_free(mdoc->htab);
 228
 229         free(mdoc);
 230 }
 231
 232
 233 struct mdoc *
 234 mdoc_alloc(void *data, const struct mdoc_cb *cb)
 235 {
 236         struct mdoc     *p;
 237
 238         p = xcalloc(1, sizeof(struct mdoc));
 239
 240         p->data = data;
 241         (void)memcpy(&p->cb, cb, sizeof(struct mdoc_cb));
 242
 243         p->htab = mdoc_tokhash_alloc();
 244         return(p);
 245 }
 246
 247
 248 int
 249 mdoc_parseln(struct mdoc *mdoc, char *buf)
 250 {
 251         int               c, i;
 252         char              tmp[5];
 253
 254         if ('.' != *buf) {
 255                 mdoc_word_alloc(mdoc, 0, buf);
 256                 mdoc->next = MDOC_NEXT_SIBLING;
 257                 return(1);
 258         }
 259
 260         if (buf[1] && '\\' == buf[1])
 261                 if (buf[2] && '\"' == buf[2])
 262                         return(1);
 263
 264         i = 1;
 265         while (buf[i] && ! isspace(buf[i]) && i < (int)sizeof(tmp))
 266                 i++;
 267
 268         if (i == (int)sizeof(tmp))
 269                 return(mdoc_err(mdoc, -1, 1, ERR_MACRO_NOTSUP));
 270         else if (i <= 2)
 271                 return(mdoc_err(mdoc, -1, 1, ERR_MACRO_NOTSUP));
 272
 273         i--;
 274
 275         (void)memcpy(tmp, buf + 1, (size_t)i);
 276         tmp[i++] = 0;
 277
 278         if (MDOC_MAX == (c = mdoc_find(mdoc, tmp)))
 279                 return(mdoc_err(mdoc, c, 1, ERR_MACRO_NOTSUP));
 280
 281         while (buf[i] && isspace(buf[i]))
 282                 i++;
 283
 284         return(mdoc_macro(mdoc, c, 1, &i, buf));
 285 }
 286
 287
 288 void
 289 mdoc_msg(struct mdoc *mdoc, int pos, const char *fmt, ...)
 290 {
 291         va_list          ap;
 292         char             buf[256];
 293
 294         if (NULL == mdoc->cb.mdoc_msg)
 295                 return;
 296
 297         va_start(ap, fmt);
 298         (void)vsnprintf(buf, sizeof(buf), fmt, ap);
 299         va_end(ap);
 300
 301         (*mdoc->cb.mdoc_msg)(mdoc->data, pos, buf);
 302 }
 303
 304
 305 int
 306 mdoc_err(struct mdoc *mdoc, int tok, int pos, enum mdoc_err type)
 307 {
 308
 309         if (NULL == mdoc->cb.mdoc_err)
 310                 return(0);
 311         return((*mdoc->cb.mdoc_err)(mdoc->data, tok, pos, type));
 312 }
 313
 314
 315 int
 316 mdoc_warn(struct mdoc *mdoc, int tok, int pos, enum mdoc_warn type)
 317 {
 318
 319         if (NULL == mdoc->cb.mdoc_warn)
 320                 return(0);
 321         return((*mdoc->cb.mdoc_warn)(mdoc->data, tok, pos, type));
 322 }
 323
 324
 325 int
 326 mdoc_macro(struct mdoc *mdoc, int tok, int ppos, int *pos, char *buf)
 327 {
 328
 329         if (MDOC_PROLOGUE & mdoc_macros[tok].flags &&
 330                         SEC_PROLOGUE == mdoc->sec_lastn)
 331                 return(macro_prologue(mdoc, tok, ppos, pos, buf));
 332
 333         if (SEC_PROLOGUE == mdoc->sec_lastn)
 334                 return(mdoc_err(mdoc, tok, ppos, ERR_SEC_PROLOGUE));
 335
 336         if (NULL == (mdoc_macros[tok].fp)) {
 337                 (void)mdoc_err(mdoc, tok, ppos, ERR_MACRO_NOTSUP);
 338                 return(0);
 339         }
 340
 341         if (1 != ppos && ! (MDOC_CALLABLE & mdoc_macros[tok].flags)) {
 342                 (void)mdoc_err(mdoc, tok, ppos, ERR_MACRO_NOTCALL);
 343                 return(0);
 344         }
 345
 346         return((*mdoc_macros[tok].fp)(mdoc, tok, ppos, pos, buf));
 347 }
 348
 349
 350 static void
 351 mdoc_node_append(struct mdoc *mdoc, int pos, struct mdoc_node *p)
 352 {
 353         const char       *nn, *on, *nt, *ot, *act;
 354
 355         switch (p->type) {
 356         case (MDOC_TEXT):
 357                 nn = p->data.text.string;
 358                 nt = "text";
 359                 break;
 360         case (MDOC_BODY):
 361                 nn = mdoc_macronames[p->data.body.tok];
 362                 nt = "body";
 363                 break;
 364         case (MDOC_ELEM):
 365                 nn = mdoc_macronames[p->data.elem.tok];
 366                 nt = "elem";
 367                 break;
 368         case (MDOC_HEAD):
 369                 nn = mdoc_macronames[p->data.head.tok];
 370                 nt = "head";
 371                 break;
 372         case (MDOC_BLOCK):
 373                 nn = mdoc_macronames[p->data.block.tok];
 374                 nt = "block";
 375                 break;
 376         default:
 377                 abort();
 378                 /* NOTREACHED */
 379         }
 380
 381         if (NULL == mdoc->first) {
 382                 assert(NULL == mdoc->last);
 383                 mdoc->first = p;
 384                 mdoc->last = p;
 385                 mdoc_msg(mdoc, pos, "parse: root %s `%s'", nt, nn);
 386                 return;
 387         }
 388
 389         switch (mdoc->last->type) {
 390         case (MDOC_TEXT):
 391                 on = "<text>";
 392                 ot = "text";
 393                 break;
 394         case (MDOC_BODY):
 395                 on = mdoc_macronames[mdoc->last->data.body.tok];
 396                 ot = "body";
 397                 break;
 398         case (MDOC_ELEM):
 399                 on = mdoc_macronames[mdoc->last->data.elem.tok];
 400                 ot = "elem";
 401                 break;
 402         case (MDOC_HEAD):
 403                 on = mdoc_macronames[mdoc->last->data.head.tok];
 404                 ot = "head";
 405                 break;
 406         case (MDOC_BLOCK):
 407                 on = mdoc_macronames[mdoc->last->data.block.tok];
 408                 ot = "block";
 409                 break;
 410         default:
 411                 abort();
 412                 /* NOTREACHED */
 413         }
 414
 415         switch (mdoc->next) {
 416         case (MDOC_NEXT_SIBLING):
 417                 mdoc->last->next = p;
 418                 p->prev = mdoc->last;
 419                 p->parent = mdoc->last->parent;
 420                 act = "sibling";
 421                 break;
 422         case (MDOC_NEXT_CHILD):
 423                 mdoc->last->child = p;
 424                 p->parent = mdoc->last;
 425                 act = "child";
 426                 break;
 427         default:
 428                 abort();
 429                 /* NOTREACHED */
 430         }
 431
 432         mdoc_msg(mdoc, pos, "parse: %s `%s' %s of %s `%s'",
 433                         nt, nn, act, ot, on);
 434
 435         mdoc->last = p;
 436 }
 437
 438
 439 void
 440 mdoc_head_alloc(struct mdoc *mdoc, int pos, int tok)
 441 {
 442         struct mdoc_node *p;
 443
 444         assert(mdoc->first);
 445         assert(mdoc->last);
 446
 447         p = xcalloc(1, sizeof(struct mdoc_node));
 448
 449         p->type = MDOC_HEAD;
 450         p->data.head.tok = tok;
 451
 452         mdoc_node_append(mdoc, pos, p);
 453 }
 454
 455
 456 void
 457 mdoc_body_alloc(struct mdoc *mdoc, int pos, int tok)
 458 {
 459         struct mdoc_node *p;
 460
 461         assert(mdoc->first);
 462         assert(mdoc->last);
 463
 464         p = xcalloc(1, sizeof(struct mdoc_node));
 465
 466         p->type = MDOC_BODY;
 467         p->data.body.tok = tok;
 468
 469         mdoc_node_append(mdoc, pos, p);
 470 }
 471
 472
 473 void
 474 mdoc_block_alloc(struct mdoc *mdoc, int pos, int tok,
 475                 size_t argsz, const struct mdoc_arg *args)
 476 {
 477         struct mdoc_node *p;
 478
 479         p = xcalloc(1, sizeof(struct mdoc_node));
 480
 481         p->type = MDOC_BLOCK;
 482         p->data.block.tok = tok;
 483         p->data.block.argc = argsz;
 484         p->data.block.argv = argdup(argsz, args);
 485
 486         mdoc_node_append(mdoc, pos, p);
 487 }
 488
 489
 490 void
 491 mdoc_elem_alloc(struct mdoc *mdoc, int pos, int tok,
 492                 size_t argsz, const struct mdoc_arg *args)
 493 {
 494         struct mdoc_node *p;
 495
 496         p = xcalloc(1, sizeof(struct mdoc_node));
 497         p->type = MDOC_ELEM;
 498         p->data.elem.tok = tok;
 499         /* FIXME: freeing of params... */
 500         p->data.elem.argc = argsz;
 501         p->data.elem.argv = argdup(argsz, args);
 502
 503         mdoc_node_append(mdoc, pos, p);
 504 }
 505
 506
 507 void
 508 mdoc_word_alloc(struct mdoc *mdoc, int pos, const char *word)
 509 {
 510         struct mdoc_node *p;
 511
 512         p = xcalloc(1, sizeof(struct mdoc_node));
 513         p->type = MDOC_TEXT;
 514         p->data.text.string = xstrdup(word);
 515
 516         mdoc_node_append(mdoc, pos, p);
 517 }
 518
 519
 520 static void
 521 argfree(size_t sz, struct mdoc_arg *p)
 522 {
 523         int              i, j;
 524
 525         if (0 == sz)
 526                 return;
 527
 528         assert(p);
 529         /* LINTED */
 530         for (i = 0; i < (int)sz; i++)
 531                 if (p[i].sz > 0) {
 532                         assert(p[i].value);
 533                         /* LINTED */
 534                         for (j = 0; j < (int)p[i].sz; j++)
 535                                 free(p[i].value[j]);
 536                 }
 537         free(p);
 538 }
 539
 540
 541 static void
 542 mdoc_elem_free(struct mdoc_elem *p)
 543 {
 544
 545         argfree(p->argc, p->argv);
 546 }
 547
 548
 549 static void
 550 mdoc_block_free(struct mdoc_block *p)
 551 {
 552
 553         argfree(p->argc, p->argv);
 554 }
 555
 556
 557 static void
 558 mdoc_text_free(struct mdoc_text *p)
 559 {
 560
 561         if (p->string)
 562                 free(p->string);
 563 }
 564
 565
 566 void
 567 mdoc_node_free(struct mdoc_node *p)
 568 {
 569
 570         switch (p->type) {
 571         case (MDOC_TEXT):
 572                 mdoc_text_free(&p->data.text);
 573                 break;
 574         case (MDOC_ELEM):
 575                 mdoc_elem_free(&p->data.elem);
 576                 break;
 577         case (MDOC_BLOCK):
 578                 mdoc_block_free(&p->data.block);
 579                 break;
 580         default:
 581                 break;
 582         }
 583
 584         free(p);
 585 }
 586
 587
 588 static void
 589 mdoc_node_freelist(struct mdoc_node *p)
 590 {
 591
 592         if (p->child)
 593                 mdoc_node_freelist(p->child);
 594         if (p->next)
 595                 mdoc_node_freelist(p->next);
 596
 597         mdoc_node_free(p);
 598 }
 599
 600
 601 int
 602 mdoc_find(const struct mdoc *mdoc, const char *key)
 603 {
 604
 605         return(mdoc_tokhash_find(mdoc->htab, key));
 606 }
 607
 608
 609 static void
 610 argcpy(struct mdoc_arg *dst, const struct mdoc_arg *src)
 611 {
 612         int              i;
 613
 614         dst->arg = src->arg;
 615         if (0 == (dst->sz = src->sz))
 616                 return;
 617         dst->value = xcalloc(dst->sz, sizeof(char *));
 618         for (i = 0; i < (int)dst->sz; i++)
 619                 dst->value[i] = xstrdup(src->value[i]);
 620 }
 621
 622
 623 static struct mdoc_arg *
 624 argdup(size_t argsz, const struct mdoc_arg *args)
 625 {
 626         struct mdoc_arg *pp;
 627         int              i;
 628
 629         if (0 == argsz)
 630                 return(NULL);
 631
 632         pp = xcalloc((size_t)argsz, sizeof(struct mdoc_arg));
 633         for (i = 0; i < (int)argsz; i++)
 634                 argcpy(&pp[i], &args[i]);
 635
 636         return(pp);
 637 }
 638