gen/FreeBSD/vis.c

   1 /*      $NetBSD: vis.c,v 1.62 2014/09/08 17:35:01 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*-
  33  * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  46  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  47  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  48  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  49  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  50  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  51  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  52  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  53  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  54  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  55  * POSSIBILITY OF SUCH DAMAGE.
  56  */
  57
  58 #include <sys/cdefs.h>
  59 #if defined(LIBC_SCCS) && !defined(lint)
  60 __RCSID("$NetBSD: vis.c,v 1.62 2014/09/08 17:35:01 christos Exp $");
  61 #endif /* LIBC_SCCS and not lint */
  62 #ifdef __FBSDID
  63 __FBSDID("$FreeBSD$");
  64 #define _DIAGASSERT(x)  assert(x)
  65 #endif
  66
  67 #include <sys/types.h>
  68 #include <sys/param.h>
  69
  70 #include <assert.h>
  71 #include <vis.h>
  72 #include <errno.h>
  73 #include <stdlib.h>
  74 #include <wchar.h>
  75 #include <wctype.h>
  76
  77 #if !HAVE_VIS || !HAVE_SVIS
  78 #include <ctype.h>
  79 #include <limits.h>
  80 #include <stdio.h>
  81 #include <string.h>
  82
  83 /*
  84  * The reason for going through the trouble to deal with character encodings
  85  * in vis(3), is that we use this to safe encode output of commands. This
  86  * safe encoding varies depending on the character set. For example if we
  87  * display ps output in French, we don't want to display French characters
  88  * as M-foo.
  89  */
  90
  91 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
  92
  93 #undef BELL
  94 #define BELL L'\a'
  95
  96 #define iswoctal(c)     (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
  97 #define iswwhite(c)     (c == L' ' || c == L'\t' || c == L'\n')
  98 #define iswsafe(c)      (c == L'\b' || c == BELL || c == L'\r')
  99 #define xtoa(c)         L"0123456789abcdef"[c]
 100 #define XTOA(c)         L"0123456789ABCDEF"[c]
 101
 102 #define MAXEXTRAS       10
 103
 104 _Static_assert(MB_LEN_MAX <= sizeof(uint64_t), "MB_LEN_MAX is less than 64-bits");
 105
 106 /*
 107  * This is do_hvis, for HTTP style (RFC 1808)
 108  */
 109 static wchar_t *
 110 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
 111 {
 112         if (iswalnum(c)
 113             /* safe */
 114             || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
 115             /* extra */
 116             || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
 117             || c == L',')
 118                 dst = do_svis(dst, c, flags, nextc, extra);
 119         else {
 120                 *dst++ = L'%';
 121                 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
 122                 *dst++ = xtoa((unsigned int)c & 0xf);
 123         }
 124
 125         return dst;
 126 }
 127
 128 /*
 129  * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
 130  * NB: No handling of long lines or CRLF.
 131  */
 132 static wchar_t *
 133 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
 134 {
 135         if ((c != L'\n') &&
 136             /* Space at the end of the line */
 137             ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
 138             /* Out of range */
 139             (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
 140             /* Specific char to be escaped */
 141             wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
 142                 *dst++ = L'=';
 143                 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
 144                 *dst++ = XTOA((unsigned int)c & 0xf);
 145         } else
 146                 dst = do_svis(dst, c, flags, nextc, extra);
 147         return dst;
 148 }
 149
 150 /*
 151  * Output single byte of multibyte character.
 152  */
 153 static wchar_t *
 154 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
 155 {
 156         if (flags & VIS_CSTYLE) {
 157                 switch (c) {
 158                 case L'\n':
 159                         *dst++ = L'\\'; *dst++ = L'n';
 160                         return dst;
 161                 case L'\r':
 162                         *dst++ = L'\\'; *dst++ = L'r';
 163                         return dst;
 164                 case L'\b':
 165                         *dst++ = L'\\'; *dst++ = L'b';
 166                         return dst;
 167                 case BELL:
 168                         *dst++ = L'\\'; *dst++ = L'a';
 169                         return dst;
 170                 case L'\v':
 171                         *dst++ = L'\\'; *dst++ = L'v';
 172                         return dst;
 173                 case L'\t':
 174                         *dst++ = L'\\'; *dst++ = L't';
 175                         return dst;
 176                 case L'\f':
 177                         *dst++ = L'\\'; *dst++ = L'f';
 178                         return dst;
 179                 case L' ':
 180                         *dst++ = L'\\'; *dst++ = L's';
 181                         return dst;
 182                 case L'\0':
 183                         *dst++ = L'\\'; *dst++ = L'0';
 184                         if (iswoctal(nextc)) {
 185                                 *dst++ = L'0';
 186                                 *dst++ = L'0';
 187                         }
 188                         return dst;
 189                 default:
 190                         if (iswgraph(c)) {
 191                                 *dst++ = L'\\';
 192                                 *dst++ = c;
 193                                 return dst;
 194                         }
 195                 }
 196         }
 197         if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
 198                 *dst++ = L'\\';
 199                 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0';
 200                 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0';
 201                 *dst++ =                             (c       & 07) + L'0';
 202         } else {
 203                 if ((flags & VIS_NOSLASH) == 0)
 204                         *dst++ = L'\\';
 205
 206                 if (c & 0200) {
 207                         c &= 0177;
 208                         *dst++ = L'M';
 209                 }
 210
 211                 if (iswcntrl(c)) {
 212                         *dst++ = L'^';
 213                         if (c == 0177)
 214                                 *dst++ = L'?';
 215                         else
 216                                 *dst++ = c + L'@';
 217                 } else {
 218                         *dst++ = L'-';
 219                         *dst++ = c;
 220                 }
 221         }
 222
 223         return dst;
 224 }
 225
 226 /*
 227  * This is do_vis, the central code of vis.
 228  * dst:       Pointer to the destination buffer
 229  * c:         Character to encode
 230  * flags:     Flags word
 231  * nextc:     The character following 'c'
 232  * extra:     Pointer to the list of extra characters to be
 233  *            backslash-protected.
 234  */
 235 static wchar_t *
 236 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
 237 {
 238         int iswextra, i, shft;
 239         uint64_t bmsk, wmsk;
 240
 241         iswextra = wcschr(extra, c) != NULL;
 242         if (!iswextra && (iswgraph(c) || iswwhite(c) ||
 243             ((flags & VIS_SAFE) && iswsafe(c)))) {
 244                 *dst++ = c;
 245                 return dst;
 246         }
 247
 248         /* See comment in istrsenvisx() output loop, below. */
 249         wmsk = 0;
 250         for (i = sizeof(wmsk) - 1; i >= 0; i--) {
 251                 shft = i * NBBY;
 252                 bmsk = (uint64_t)0xffLL << shft;
 253                 wmsk |= bmsk;
 254                 if ((c & wmsk) || i == 0)
 255                         dst = do_mbyte(dst, (wint_t)(
 256                             (uint64_t)(c & bmsk) >> shft),
 257                             flags, nextc, iswextra);
 258         }
 259
 260         return dst;
 261 }
 262
 263 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
 264
 265 /*
 266  * Return the appropriate encoding function depending on the flags given.
 267  */
 268 static visfun_t
 269 getvisfun(int flags)
 270 {
 271         if (flags & VIS_HTTPSTYLE)
 272                 return do_hvis;
 273         if (flags & VIS_MIMESTYLE)
 274                 return do_mvis;
 275         return do_svis;
 276 }
 277
 278 /*
 279  * Expand list of extra characters to not visually encode.
 280  */
 281 static wchar_t *
 282 makeextralist(int flags, const char *src)
 283 {
 284         wchar_t *dst, *d;
 285         size_t len;
 286
 287         len = strlen(src);
 288         if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
 289                 return NULL;
 290
 291         if (mbstowcs(dst, src, len) == (size_t)-1) {
 292                 size_t i;
 293                 for (i = 0; i < len; i++)
 294                         dst[i] = (wint_t)(u_char)src[i];
 295                 d = dst + len;
 296         } else
 297                 d = dst + wcslen(dst);
 298
 299         if (flags & VIS_GLOB) {
 300                 *d++ = L'*';
 301                 *d++ = L'?';
 302                 *d++ = L'[';
 303                 *d++ = L'#';
 304         }
 305
 306         if (flags & VIS_SP) *d++ = L' ';
 307         if (flags & VIS_TAB) *d++ = L'\t';
 308         if (flags & VIS_NL) *d++ = L'\n';
 309         if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
 310         *d = L'\0';
 311
 312         return dst;
 313 }
 314
 315 /*
 316  * istrsenvisx()
 317  *      The main internal function.
 318  *      All user-visible functions call this one.
 319  */
 320 static int
 321 istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength,
 322     int flags, const char *mbextra, int *cerr_ptr)
 323 {
 324         wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
 325         size_t len, olen;
 326         uint64_t bmsk, wmsk;
 327         wint_t c;
 328         visfun_t f;
 329         int clen = 0, cerr = 0, error = -1, i, shft;
 330         ssize_t mbslength, maxolen;
 331
 332         _DIAGASSERT(mbdst != NULL);
 333         _DIAGASSERT(mbsrc != NULL || mblength == 0);
 334         _DIAGASSERT(mbextra != NULL);
 335
 336         /*
 337          * Input (mbsrc) is a char string considered to be multibyte
 338          * characters.  The input loop will read this string pulling
 339          * one character, possibly multiple bytes, from mbsrc and
 340          * converting each to wchar_t in src.
 341          *
 342          * The vis conversion will be done using the wide char
 343          * wchar_t string.
 344          *
 345          * This will then be converted back to a multibyte string to
 346          * return to the caller.
 347          */
 348
 349         /* Allocate space for the wide char strings */
 350         psrc = pdst = extra = NULL;
 351         if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL)
 352                 return -1;
 353         if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL)
 354                 goto out;
 355         dst = pdst;
 356         src = psrc;
 357
 358         /* Use caller's multibyte conversion error flag. */
 359         if (cerr_ptr)
 360                 cerr = *cerr_ptr;
 361
 362         /*
 363          * Input loop.
 364          * Handle up to mblength characters (not bytes).  We do not
 365          * stop at NULs because we may be processing a block of data
 366          * that includes NULs.
 367          */
 368         mbslength = (ssize_t)mblength;
 369         /*
 370          * When inputing a single character, must also read in the
 371          * next character for nextc, the look-ahead character.
 372          */
 373         if (mbslength == 1)
 374                 mbslength++;
 375         while (mbslength > 0) {
 376                 /* Convert one multibyte character to wchar_t. */
 377                 if (!cerr)
 378                         clen = mbtowc(src, mbsrc, MB_LEN_MAX);
 379                 if (cerr || clen < 0) {
 380                         /* Conversion error, process as a byte instead. */
 381                         *src = (wint_t)(u_char)*mbsrc;
 382                         clen = 1;
 383                         cerr = 1;
 384                 }
 385                 if (clen == 0)
 386                         /*
 387                          * NUL in input gives 0 return value. process
 388                          * as single NUL byte and keep going.
 389                          */
 390                         clen = 1;
 391                 /* Advance buffer character pointer. */
 392                 src++;
 393                 /* Advance input pointer by number of bytes read. */
 394                 mbsrc += clen;
 395                 /* Decrement input byte count. */
 396                 mbslength -= clen;
 397         }
 398         len = src - psrc;
 399         src = psrc;
 400         /*
 401          * In the single character input case, we will have actually
 402          * processed two characters, c and nextc.  Reset len back to
 403          * just a single character.
 404          */
 405         if (mblength < len)
 406                 len = mblength;
 407
 408         /* Convert extra argument to list of characters for this mode. */
 409         extra = makeextralist(flags, mbextra);
 410         if (!extra) {
 411                 if (dlen && *dlen == 0) {
 412                         errno = ENOSPC;
 413                         goto out;
 414                 }
 415                 *mbdst = '\0';          /* can't create extra, return "" */
 416                 error = 0;
 417                 goto out;
 418         }
 419
 420         /* Look up which processing function to call. */
 421         f = getvisfun(flags);
 422
 423         /*
 424          * Main processing loop.
 425          * Call do_Xvis processing function one character at a time
 426          * with next character available for look-ahead.
 427          */
 428         for (start = dst; len > 0; len--) {
 429                 c = *src++;
 430                 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
 431                 if (dst == NULL) {
 432                         errno = ENOSPC;
 433                         goto out;
 434                 }
 435         }
 436
 437         /* Terminate the string in the buffer. */
 438         *dst = L'\0';
 439
 440         /*
 441          * Output loop.
 442          * Convert wchar_t string back to multibyte output string.
 443          * If we have hit a multi-byte conversion error on input,
 444          * output byte-by-byte here.  Else use wctomb().
 445          */
 446         len = wcslen(start);
 447         maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
 448         olen = 0;
 449         for (dst = start; len > 0; len--) {
 450                 if (!cerr)
 451                         clen = wctomb(mbdst, *dst);
 452                 if (cerr || clen < 0) {
 453                         /*
 454                          * Conversion error, process as a byte(s) instead.
 455                          * Examine each byte and higher-order bytes for
 456                          * data.  E.g.,
 457                          *      0x000000000000a264 -> a2 64
 458                          *      0x000000001f00a264 -> 1f 00 a2 64
 459                          */
 460                         clen = 0;
 461                         wmsk = 0;
 462                         for (i = sizeof(wmsk) - 1; i >= 0; i--) {
 463                                 shft = i * NBBY;
 464                                 bmsk = (uint64_t)0xffLL << shft;
 465                                 wmsk |= bmsk;
 466                                 if ((*dst & wmsk) || i == 0)
 467                                         mbdst[clen++] = (char)(
 468                                             (uint64_t)(*dst & bmsk) >>
 469                                             shft);
 470                         }
 471                         cerr = 1;
 472                 }
 473                 /* If this character would exceed our output limit, stop. */
 474                 if (olen + clen > (size_t)maxolen)
 475                         break;
 476                 /* Advance output pointer by number of bytes written. */
 477                 mbdst += clen;
 478                 /* Advance buffer character pointer. */
 479                 dst++;
 480                 /* Incrment output character count. */
 481                 olen += clen;
 482         }
 483
 484         /* Terminate the output string. */
 485         *mbdst = '\0';
 486
 487         /* Pass conversion error flag out. */
 488         if (cerr_ptr)
 489                 *cerr_ptr = cerr;
 490
 491         free(extra);
 492         free(pdst);
 493         free(psrc);
 494
 495         return (int)olen;
 496 out:
 497         free(extra);
 498         free(pdst);
 499         free(psrc);
 500         return error;
 501 }
 502
 503 static int
 504 istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc,
 505     int flags, const char *mbextra, int *cerr_ptr)
 506 {
 507         return istrsenvisx(mbdst, dlen, mbsrc,
 508             mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr);
 509 }
 510
 511 #endif
 512
 513 #if !HAVE_SVIS
 514 /*
 515  *      The "svis" variants all take an "extra" arg that is a pointer
 516  *      to a NUL-terminated list of characters to be encoded, too.
 517  *      These functions are useful e. g. to encode strings in such a
 518  *      way so that they are not interpreted by a shell.
 519  */
 520
 521 char *
 522 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
 523 {
 524         char cc[2];
 525         int ret;
 526
 527         cc[0] = c;
 528         cc[1] = nextc;
 529
 530         ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL);
 531         if (ret < 0)
 532                 return NULL;
 533         return mbdst + ret;
 534 }
 535
 536 char *
 537 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
 538 {
 539         char cc[2];
 540         int ret;
 541
 542         cc[0] = c;
 543         cc[1] = nextc;
 544
 545         ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL);
 546         if (ret < 0)
 547                 return NULL;
 548         return mbdst + ret;
 549 }
 550
 551 int
 552 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
 553 {
 554         return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL);
 555 }
 556
 557 int
 558 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
 559 {
 560         return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL);
 561 }
 562
 563 int
 564 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
 565 {
 566         return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
 567 }
 568
 569 int
 570 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
 571     const char *mbextra)
 572 {
 573         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
 574 }
 575
 576 int
 577 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
 578     const char *mbextra, int *cerr_ptr)
 579 {
 580         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
 581 }
 582 #endif
 583
 584 #if !HAVE_VIS
 585 /*
 586  * vis - visually encode characters
 587  */
 588 char *
 589 vis(char *mbdst, int c, int flags, int nextc)
 590 {
 591         char cc[2];
 592         int ret;
 593
 594         cc[0] = c;
 595         cc[1] = nextc;
 596
 597         ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL);
 598         if (ret < 0)
 599                 return NULL;
 600         return mbdst + ret;
 601 }
 602
 603 char *
 604 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
 605 {
 606         char cc[2];
 607         int ret;
 608
 609         cc[0] = c;
 610         cc[1] = nextc;
 611
 612         ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL);
 613         if (ret < 0)
 614                 return NULL;
 615         return mbdst + ret;
 616 }
 617
 618 /*
 619  * strvis - visually encode characters from src into dst
 620  *
 621  *      Dst must be 4 times the size of src to account for possible
 622  *      expansion.  The length of dst, not including the trailing NULL,
 623  *      is returned.
 624  */
 625
 626 int
 627 strvis(char *mbdst, const char *mbsrc, int flags)
 628 {
 629         return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL);
 630 }
 631
 632 int
 633 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags)
 634 {
 635         return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL);
 636 }
 637
 638 /*
 639  * strvisx - visually encode characters from src into dst
 640  *
 641  *      Dst must be 4 times the size of src to account for possible
 642  *      expansion.  The length of dst, not including the trailing NULL,
 643  *      is returned.
 644  *
 645  *      Strvisx encodes exactly len characters from src into dst.
 646  *      This is useful for encoding a block of data.
 647  */
 648
 649 int
 650 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
 651 {
 652         return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL);
 653 }
 654
 655 int
 656 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
 657 {
 658         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL);
 659 }
 660
 661 int
 662 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
 663     int *cerr_ptr)
 664 {
 665         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
 666 }
 667 #endif