contrib/libedit/src/vis.c

   1 /*      $NetBSD: vis.c,v 1.66 2014/09/26 15:58:59 roy 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 "config.h"
  59
  60 #if defined(LIBC_SCCS) && !defined(lint)
  61 __RCSID("$NetBSD: vis.c,v 1.66 2014/09/26 15:58:59 roy Exp $");
  62 #endif /* LIBC_SCCS and not lint */
  63 #ifdef __FBSDID
  64 __FBSDID("$FreeBSD$");
  65 #endif
  66
  67 #include <sys/types.h>
  68 #include <sys/param.h>
  69
  70 #include <stdint.h>
  71 #include <assert.h>
  72 #include <vis.h>
  73 #include <errno.h>
  74 #include <stdlib.h>
  75 #include <wchar.h>
  76 #include <wctype.h>
  77
  78 #ifdef __weak_alias
  79 __weak_alias(strvisx,_strvisx)
  80 #endif
  81
  82 #if !HAVE_VIS || !HAVE_SVIS
  83 #include <ctype.h>
  84 #include <limits.h>
  85 #include <stdio.h>
  86 #include <string.h>
  87
  88 /*
  89  * The reason for going through the trouble to deal with character encodings
  90  * in vis(3), is that we use this to safe encode output of commands. This
  91  * safe encoding varies depending on the character set. For example if we
  92  * display ps output in French, we don't want to display French characters
  93  * as M-foo.
  94  */
  95
  96 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
  97
  98 #undef BELL
  99 #define BELL L'\a'
 100
 101 #define iswoctal(c)     (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
 102 #define iswwhite(c)     (c == L' ' || c == L'\t' || c == L'\n')
 103 #define iswsafe(c)      (c == L'\b' || c == BELL || c == L'\r')
 104 #define xtoa(c)         L"0123456789abcdef"[c]
 105 #define XTOA(c)         L"0123456789ABCDEF"[c]
 106
 107 #define MAXEXTRAS       30
 108
 109 static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~";
 110 static const wchar_t char_glob[] = L"*?[#";
 111
 112 #if !HAVE_NBTOOL_CONFIG_H
 113 #ifndef __NetBSD__
 114 /*
 115  * On NetBSD MB_LEN_MAX is currently 32 which does not fit on any integer
 116  * integral type and it is probably wrong, since currently the maximum
 117  * number of bytes and character needs is 6. Until this is fixed, the
 118  * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and
 119  * the assertion is commented out.
 120  */
 121 #ifdef __FreeBSD__
 122 /*
 123  * On FreeBSD including <sys/systm.h> for CTASSERT only works in kernel
 124  * mode.
 125  */
 126 #ifndef CTASSERT
 127 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
 128 #define _CTASSERT(x, y)         __CTASSERT(x, y)
 129 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
 130 #endif
 131 #endif /* __FreeBSD__ */
 132 /*
 133 CTASSERT(MB_LEN_MAX <= sizeof(uint64_t));
 134 */
 135 #endif /* !__NetBSD__ */
 136 #endif
 137
 138 /*
 139  * This is do_hvis, for HTTP style (RFC 1808)
 140  */
 141 static wchar_t *
 142 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
 143 {
 144         if (iswalnum(c)
 145             /* safe */
 146             || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
 147             /* extra */
 148             || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
 149             || c == L',')
 150                 dst = do_svis(dst, c, flags, nextc, extra);
 151         else {
 152                 *dst++ = L'%';
 153                 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
 154                 *dst++ = xtoa((unsigned int)c & 0xf);
 155         }
 156
 157         return dst;
 158 }
 159
 160 /*
 161  * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
 162  * NB: No handling of long lines or CRLF.
 163  */
 164 static wchar_t *
 165 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
 166 {
 167         if ((c != L'\n') &&
 168             /* Space at the end of the line */
 169             ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
 170             /* Out of range */
 171             (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
 172             /* Specific char to be escaped */
 173             wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
 174                 *dst++ = L'=';
 175                 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
 176                 *dst++ = XTOA((unsigned int)c & 0xf);
 177         } else
 178                 dst = do_svis(dst, c, flags, nextc, extra);
 179         return dst;
 180 }
 181
 182 /*
 183  * Output single byte of multibyte character.
 184  */
 185 static wchar_t *
 186 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
 187 {
 188         if (flags & VIS_CSTYLE) {
 189                 switch (c) {
 190                 case L'\n':
 191                         *dst++ = L'\\'; *dst++ = L'n';
 192                         return dst;
 193                 case L'\r':
 194                         *dst++ = L'\\'; *dst++ = L'r';
 195                         return dst;
 196                 case L'\b':
 197                         *dst++ = L'\\'; *dst++ = L'b';
 198                         return dst;
 199                 case BELL:
 200                         *dst++ = L'\\'; *dst++ = L'a';
 201                         return dst;
 202                 case L'\v':
 203                         *dst++ = L'\\'; *dst++ = L'v';
 204                         return dst;
 205                 case L'\t':
 206                         *dst++ = L'\\'; *dst++ = L't';
 207                         return dst;
 208                 case L'\f':
 209                         *dst++ = L'\\'; *dst++ = L'f';
 210                         return dst;
 211                 case L' ':
 212                         *dst++ = L'\\'; *dst++ = L's';
 213                         return dst;
 214                 case L'\0':
 215                         *dst++ = L'\\'; *dst++ = L'0';
 216                         if (iswoctal(nextc)) {
 217                                 *dst++ = L'0';
 218                                 *dst++ = L'0';
 219                         }
 220                         return dst;
 221                 /* We cannot encode these characters in VIS_CSTYLE
 222                  * because they special meaning */
 223                 case L'n':
 224                 case L'r':
 225                 case L'b':
 226                 case L'a':
 227                 case L'v':
 228                 case L't':
 229                 case L'f':
 230                 case L's':
 231                 case L'0':
 232                 case L'M':
 233                 case L'^':
 234                 case L'$': /* vis(1) -l */
 235                         break;
 236                 default:
 237                         if (iswgraph(c) && !iswoctal(c)) {
 238                                 *dst++ = L'\\';
 239                                 *dst++ = c;
 240                                 return dst;
 241                         }
 242                 }
 243         }
 244         if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
 245                 *dst++ = L'\\';
 246                 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0';
 247                 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0';
 248                 *dst++ =                             (c       & 07) + L'0';
 249         } else {
 250                 if ((flags & VIS_NOSLASH) == 0)
 251                         *dst++ = L'\\';
 252
 253                 if (c & 0200) {
 254                         c &= 0177;
 255                         *dst++ = L'M';
 256                 }
 257
 258                 if (iswcntrl(c)) {
 259                         *dst++ = L'^';
 260                         if (c == 0177)
 261                                 *dst++ = L'?';
 262                         else
 263                                 *dst++ = c + L'@';
 264                 } else {
 265                         *dst++ = L'-';
 266                         *dst++ = c;
 267                 }
 268         }
 269
 270         return dst;
 271 }
 272
 273 /*
 274  * This is do_vis, the central code of vis.
 275  * dst:       Pointer to the destination buffer
 276  * c:         Character to encode
 277  * flags:     Flags word
 278  * nextc:     The character following 'c'
 279  * extra:     Pointer to the list of extra characters to be
 280  *            backslash-protected.
 281  */
 282 static wchar_t *
 283 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
 284 {
 285         int iswextra, i, shft;
 286         uint64_t bmsk, wmsk;
 287
 288         iswextra = wcschr(extra, c) != NULL;
 289         if (!iswextra && (iswgraph(c) || iswwhite(c) ||
 290             ((flags & VIS_SAFE) && iswsafe(c)))) {
 291                 *dst++ = c;
 292                 return dst;
 293         }
 294
 295         /* See comment in istrsenvisx() output loop, below. */
 296         wmsk = 0;
 297         for (i = sizeof(wmsk) - 1; i >= 0; i--) {
 298                 shft = i * NBBY;
 299                 bmsk = (uint64_t)0xffLL << shft;
 300                 wmsk |= bmsk;
 301                 if ((c & wmsk) || i == 0)
 302                         dst = do_mbyte(dst, (wint_t)(
 303                             (uint64_t)(c & bmsk) >> shft),
 304                             flags, nextc, iswextra);
 305         }
 306
 307         return dst;
 308 }
 309
 310 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
 311
 312 /*
 313  * Return the appropriate encoding function depending on the flags given.
 314  */
 315 static visfun_t
 316 getvisfun(int flags)
 317 {
 318         if (flags & VIS_HTTPSTYLE)
 319                 return do_hvis;
 320         if (flags & VIS_MIMESTYLE)
 321                 return do_mvis;
 322         return do_svis;
 323 }
 324
 325 /*
 326  * Expand list of extra characters to not visually encode.
 327  */
 328 static wchar_t *
 329 makeextralist(int flags, const char *src)
 330 {
 331         wchar_t *dst, *d;
 332         size_t len;
 333         const wchar_t *s;
 334
 335         len = strlen(src);
 336         if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
 337                 return NULL;
 338
 339         if (mbstowcs(dst, src, len) == (size_t)-1) {
 340                 size_t i;
 341                 for (i = 0; i < len; i++)
 342                         dst[i] = (wchar_t)(u_char)src[i];
 343                 d = dst + len;
 344         } else
 345                 d = dst + wcslen(dst);
 346
 347         if (flags & VIS_GLOB)
 348                 for (s = char_glob; *s; *d++ = *s++)
 349                         continue;
 350
 351         if (flags & VIS_SHELL)
 352                 for (s = char_shell; *s; *d++ = *s++)
 353                         continue;
 354
 355         if (flags & VIS_SP) *d++ = L' ';
 356         if (flags & VIS_TAB) *d++ = L'\t';
 357         if (flags & VIS_NL) *d++ = L'\n';
 358         if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
 359         *d = L'\0';
 360
 361         return dst;
 362 }
 363
 364 /*
 365  * istrsenvisx()
 366  *      The main internal function.
 367  *      All user-visible functions call this one.
 368  */
 369 static int
 370 istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength,
 371     int flags, const char *mbextra, int *cerr_ptr)
 372 {
 373         wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
 374         size_t len, olen;
 375         uint64_t bmsk, wmsk;
 376         wint_t c;
 377         visfun_t f;
 378         int clen = 0, cerr = 0, error = -1, i, shft;
 379         ssize_t mbslength, maxolen;
 380
 381         _DIAGASSERT(mbdst != NULL);
 382         _DIAGASSERT(mbsrc != NULL || mblength == 0);
 383         _DIAGASSERT(mbextra != NULL);
 384
 385         /*
 386          * Input (mbsrc) is a char string considered to be multibyte
 387          * characters.  The input loop will read this string pulling
 388          * one character, possibly multiple bytes, from mbsrc and
 389          * converting each to wchar_t in src.
 390          *
 391          * The vis conversion will be done using the wide char
 392          * wchar_t string.
 393          *
 394          * This will then be converted back to a multibyte string to
 395          * return to the caller.
 396          */
 397
 398         /* Allocate space for the wide char strings */
 399         psrc = pdst = extra = NULL;
 400         if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL)
 401                 return -1;
 402         if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL)
 403                 goto out;
 404         dst = pdst;
 405         src = psrc;
 406
 407         /* Use caller's multibyte conversion error flag. */
 408         if (cerr_ptr)
 409                 cerr = *cerr_ptr;
 410
 411         /*
 412          * Input loop.
 413          * Handle up to mblength characters (not bytes).  We do not
 414          * stop at NULs because we may be processing a block of data
 415          * that includes NULs.
 416          */
 417         mbslength = (ssize_t)mblength;
 418         /*
 419          * When inputing a single character, must also read in the
 420          * next character for nextc, the look-ahead character.
 421          */
 422         if (mbslength == 1)
 423                 mbslength++;
 424         while (mbslength > 0) {
 425                 /* Convert one multibyte character to wchar_t. */
 426                 if (!cerr)
 427                         clen = mbtowc(src, mbsrc, MB_LEN_MAX);
 428                 if (cerr || clen < 0) {
 429                         /* Conversion error, process as a byte instead. */
 430                         *src = (wint_t)(u_char)*mbsrc;
 431                         clen = 1;
 432                         cerr = 1;
 433                 }
 434                 if (clen == 0)
 435                         /*
 436                          * NUL in input gives 0 return value. process
 437                          * as single NUL byte and keep going.
 438                          */
 439                         clen = 1;
 440                 /* Advance buffer character pointer. */
 441                 src++;
 442                 /* Advance input pointer by number of bytes read. */
 443                 mbsrc += clen;
 444                 /* Decrement input byte count. */
 445                 mbslength -= clen;
 446         }
 447         len = src - psrc;
 448         src = psrc;
 449         /*
 450          * In the single character input case, we will have actually
 451          * processed two characters, c and nextc.  Reset len back to
 452          * just a single character.
 453          */
 454         if (mblength < len)
 455                 len = mblength;
 456
 457         /* Convert extra argument to list of characters for this mode. */
 458         extra = makeextralist(flags, mbextra);
 459         if (!extra) {
 460                 if (dlen && *dlen == 0) {
 461                         errno = ENOSPC;
 462                         goto out;
 463                 }
 464                 *mbdst = '\0';          /* can't create extra, return "" */
 465                 error = 0;
 466                 goto out;
 467         }
 468
 469         /* Look up which processing function to call. */
 470         f = getvisfun(flags);
 471
 472         /*
 473          * Main processing loop.
 474          * Call do_Xvis processing function one character at a time
 475          * with next character available for look-ahead.
 476          */
 477         for (start = dst; len > 0; len--) {
 478                 c = *src++;
 479                 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
 480                 if (dst == NULL) {
 481                         errno = ENOSPC;
 482                         goto out;
 483                 }
 484         }
 485
 486         /* Terminate the string in the buffer. */
 487         *dst = L'\0';
 488
 489         /*
 490          * Output loop.
 491          * Convert wchar_t string back to multibyte output string.
 492          * If we have hit a multi-byte conversion error on input,
 493          * output byte-by-byte here.  Else use wctomb().
 494          */
 495         len = wcslen(start);
 496         maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
 497         olen = 0;
 498         for (dst = start; len > 0; len--) {
 499                 if (!cerr)
 500                         clen = wctomb(mbdst, *dst);
 501                 if (cerr || clen < 0) {
 502                         /*
 503                          * Conversion error, process as a byte(s) instead.
 504                          * Examine each byte and higher-order bytes for
 505                          * data.  E.g.,
 506                          *      0x000000000000a264 -> a2 64
 507                          *      0x000000001f00a264 -> 1f 00 a2 64
 508                          */
 509                         clen = 0;
 510                         wmsk = 0;
 511                         for (i = sizeof(wmsk) - 1; i >= 0; i--) {
 512                                 shft = i * NBBY;
 513                                 bmsk = (uint64_t)0xffLL << shft;
 514                                 wmsk |= bmsk;
 515                                 if ((*dst & wmsk) || i == 0)
 516                                         mbdst[clen++] = (char)(
 517                                             (uint64_t)(*dst & bmsk) >>
 518                                             shft);
 519                         }
 520                         cerr = 1;
 521                 }
 522                 /* If this character would exceed our output limit, stop. */
 523                 if (olen + clen > (size_t)maxolen)
 524                         break;
 525                 /* Advance output pointer by number of bytes written. */
 526                 mbdst += clen;
 527                 /* Advance buffer character pointer. */
 528                 dst++;
 529                 /* Incrment output character count. */
 530                 olen += clen;
 531         }
 532
 533         /* Terminate the output string. */
 534         *mbdst = '\0';
 535
 536         /* Pass conversion error flag out. */
 537         if (cerr_ptr)
 538                 *cerr_ptr = cerr;
 539
 540         free(extra);
 541         free(pdst);
 542         free(psrc);
 543
 544         return (int)olen;
 545 out:
 546         free(extra);
 547         free(pdst);
 548         free(psrc);
 549         return error;
 550 }
 551
 552 static int
 553 istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc,
 554     int flags, const char *mbextra, int *cerr_ptr)
 555 {
 556         return istrsenvisx(mbdst, dlen, mbsrc,
 557             mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr);
 558 }
 559
 560 #endif
 561
 562 #if !HAVE_SVIS
 563 /*
 564  *      The "svis" variants all take an "extra" arg that is a pointer
 565  *      to a NUL-terminated list of characters to be encoded, too.
 566  *      These functions are useful e. g. to encode strings in such a
 567  *      way so that they are not interpreted by a shell.
 568  */
 569
 570 char *
 571 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
 572 {
 573         char cc[2];
 574         int ret;
 575
 576         cc[0] = c;
 577         cc[1] = nextc;
 578
 579         ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL);
 580         if (ret < 0)
 581                 return NULL;
 582         return mbdst + ret;
 583 }
 584
 585 char *
 586 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
 587 {
 588         char cc[2];
 589         int ret;
 590
 591         cc[0] = c;
 592         cc[1] = nextc;
 593
 594         ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL);
 595         if (ret < 0)
 596                 return NULL;
 597         return mbdst + ret;
 598 }
 599
 600 int
 601 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
 602 {
 603         return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL);
 604 }
 605
 606 int
 607 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
 608 {
 609         return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL);
 610 }
 611
 612 int
 613 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
 614 {
 615         return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
 616 }
 617
 618 int
 619 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
 620     const char *mbextra)
 621 {
 622         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
 623 }
 624
 625 int
 626 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
 627     const char *mbextra, int *cerr_ptr)
 628 {
 629         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
 630 }
 631 #endif
 632
 633 #if !HAVE_VIS
 634 /*
 635  * vis - visually encode characters
 636  */
 637 char *
 638 vis(char *mbdst, int c, int flags, int nextc)
 639 {
 640         char cc[2];
 641         int ret;
 642
 643         cc[0] = c;
 644         cc[1] = nextc;
 645
 646         ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL);
 647         if (ret < 0)
 648                 return NULL;
 649         return mbdst + ret;
 650 }
 651
 652 char *
 653 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
 654 {
 655         char cc[2];
 656         int ret;
 657
 658         cc[0] = c;
 659         cc[1] = nextc;
 660
 661         ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL);
 662         if (ret < 0)
 663                 return NULL;
 664         return mbdst + ret;
 665 }
 666
 667 /*
 668  * strvis - visually encode characters from src into dst
 669  *
 670  *      Dst must be 4 times the size of src to account for possible
 671  *      expansion.  The length of dst, not including the trailing NULL,
 672  *      is returned.
 673  */
 674
 675 int
 676 strvis(char *mbdst, const char *mbsrc, int flags)
 677 {
 678         return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL);
 679 }
 680
 681 int
 682 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags)
 683 {
 684         return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL);
 685 }
 686
 687 /*
 688  * strvisx - visually encode characters from src into dst
 689  *
 690  *      Dst must be 4 times the size of src to account for possible
 691  *      expansion.  The length of dst, not including the trailing NULL,
 692  *      is returned.
 693  *
 694  *      Strvisx encodes exactly len characters from src into dst.
 695  *      This is useful for encoding a block of data.
 696  */
 697
 698 int
 699 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
 700 {
 701         return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL);
 702 }
 703
 704 int
 705 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
 706 {
 707         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL);
 708 }
 709
 710 int
 711 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
 712     int *cerr_ptr)
 713 {
 714         return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
 715 }
 716 #endif