1 /* $NetBSD: vis.c,v 1.74 2017/11/27 16:37:21 christos Exp $ */ 2 /* $FreeBSD: head/contrib/libc-vis/vis.c 326307 2017-11-28 01:35:28Z brooks $ */ 3 4 /*- 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc. 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 47 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 48 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 49 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 50 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 51 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 52 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 53 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 54 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 55 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 56 * POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 #include "namespace.h" 60 #include <sys/types.h> 61 #include <sys/param.h> 62 63 #include <assert.h> 64 #include <vis.h> 65 #include <errno.h> 66 #include <stdlib.h> 67 #include <wchar.h> 68 #include <wctype.h> 69 70 #ifdef __weak_alias 71 __weak_alias(strvisx,_strvisx) 72 #endif 73 74 #if !HAVE_VIS || !HAVE_SVIS 75 #include <ctype.h> 76 #include <limits.h> 77 #include <stdio.h> 78 #include <string.h> 79 80 /* 81 * The reason for going through the trouble to deal with character encodings 82 * in vis(3), is that we use this to safe encode output of commands. This 83 * safe encoding varies depending on the character set. For example if we 84 * display ps output in French, we don't want to display French characters 85 * as M-foo. 86 */ 87 88 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *); 89 90 #undef BELL 91 #define BELL L'\a' 92 93 #if defined(LC_C_LOCALE) 94 #define iscgraph(c) isgraph_l(c, LC_C_LOCALE) 95 #else 96 /* Keep it simple for now, no locale stuff */ 97 #define iscgraph(c) isgraph(c) 98 #ifdef notyet 99 #include <locale.h> 100 static int 101 iscgraph(int c) { 102 int rv; 103 char *ol; 104 105 ol = setlocale(LC_CTYPE, "C"); 106 rv = isgraph(c); 107 if (ol) 108 setlocale(LC_CTYPE, ol); 109 return rv; 110 } 111 #endif 112 #endif 113 114 #define ISGRAPH(flags, c) \ 115 (((flags) & VIS_NOLOCALE) ? iscgraph(c) : iswgraph(c)) 116 117 #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7') 118 #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n') 119 #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r') 120 #define xtoa(c) L"0123456789abcdef"[c] 121 #define XTOA(c) L"0123456789ABCDEF"[c] 122 123 #define MAXEXTRAS 30 124 125 static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~"; 126 static const wchar_t char_glob[] = L"*?[#"; 127 128 #if !HAVE_NBTOOL_CONFIG_H 129 #ifndef __NetBSD__ 130 /* 131 * On NetBSD MB_LEN_MAX is currently 32 which does not fit on any integer 132 * integral type and it is probably wrong, since currently the maximum 133 * number of bytes and character needs is 6. Until this is fixed, the 134 * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and 135 * the assertion is commented out. 136 */ 137 #if defined(__FreeBSD__) || defined(__DragonFly__) 138 /* 139 * On FreeBSD and DragonFly, including <sys/systm.h> for CTASSERT only 140 * works in kernel mode. 141 */ 142 #ifndef CTASSERT 143 #define CTASSERT(x) _CTASSERT(x, __LINE__) 144 #define _CTASSERT(x, y) __CTASSERT(x, y) 145 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 146 #endif 147 #endif /* __FreeBSD__ || __DragonFly__ */ 148 CTASSERT(MB_LEN_MAX <= sizeof(uint64_t)); 149 #endif /* !__NetBSD__ */ 150 #endif 151 152 /* 153 * This is do_hvis, for HTTP style (RFC 1808) 154 */ 155 static wchar_t * 156 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 157 { 158 if (iswalnum(c) 159 /* safe */ 160 || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+' 161 /* extra */ 162 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')' 163 || c == L',') 164 dst = do_svis(dst, c, flags, nextc, extra); 165 else { 166 *dst++ = L'%'; 167 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf); 168 *dst++ = xtoa((unsigned int)c & 0xf); 169 } 170 171 return dst; 172 } 173 174 /* 175 * This is do_mvis, for Quoted-Printable MIME (RFC 2045) 176 * NB: No handling of long lines or CRLF. 177 */ 178 static wchar_t * 179 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 180 { 181 if ((c != L'\n') && 182 /* Space at the end of the line */ 183 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) || 184 /* Out of range */ 185 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) || 186 /* Specific char to be escaped */ 187 wcschr(L"#$@[\\]^`{|}~", c) != NULL)) { 188 *dst++ = L'='; 189 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf); 190 *dst++ = XTOA((unsigned int)c & 0xf); 191 } else 192 dst = do_svis(dst, c, flags, nextc, extra); 193 return dst; 194 } 195 196 /* 197 * Output single byte of multibyte character. 198 */ 199 static wchar_t * 200 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra) 201 { 202 if (flags & VIS_CSTYLE) { 203 switch (c) { 204 case L'\n': 205 *dst++ = L'\\'; *dst++ = L'n'; 206 return dst; 207 case L'\r': 208 *dst++ = L'\\'; *dst++ = L'r'; 209 return dst; 210 case L'\b': 211 *dst++ = L'\\'; *dst++ = L'b'; 212 return dst; 213 case BELL: 214 *dst++ = L'\\'; *dst++ = L'a'; 215 return dst; 216 case L'\v': 217 *dst++ = L'\\'; *dst++ = L'v'; 218 return dst; 219 case L'\t': 220 *dst++ = L'\\'; *dst++ = L't'; 221 return dst; 222 case L'\f': 223 *dst++ = L'\\'; *dst++ = L'f'; 224 return dst; 225 case L' ': 226 *dst++ = L'\\'; *dst++ = L's'; 227 return dst; 228 case L'\0': 229 *dst++ = L'\\'; *dst++ = L'0'; 230 if (iswoctal(nextc)) { 231 *dst++ = L'0'; 232 *dst++ = L'0'; 233 } 234 return dst; 235 /* We cannot encode these characters in VIS_CSTYLE 236 * because they special meaning */ 237 case L'n': 238 case L'r': 239 case L'b': 240 case L'a': 241 case L'v': 242 case L't': 243 case L'f': 244 case L's': 245 case L'x': 246 case L'0': 247 case L'E': 248 case L'F': 249 case L'M': 250 case L'-': 251 case L'^': 252 case L'$': /* vis(1) -l */ 253 break; 254 default: 255 if (ISGRAPH(flags, c) && !iswoctal(c)) { 256 *dst++ = L'\\'; 257 *dst++ = c; 258 return dst; 259 } 260 } 261 } 262 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) { 263 *dst++ = L'\\'; 264 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0'; 265 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0'; 266 *dst++ = (c & 07) + L'0'; 267 } else { 268 if ((flags & VIS_NOSLASH) == 0) 269 *dst++ = L'\\'; 270 271 if (c & 0200) { 272 c &= 0177; 273 *dst++ = L'M'; 274 } 275 276 if (iswcntrl(c)) { 277 *dst++ = L'^'; 278 if (c == 0177) 279 *dst++ = L'?'; 280 else 281 *dst++ = c + L'@'; 282 } else { 283 *dst++ = L'-'; 284 *dst++ = c; 285 } 286 } 287 288 return dst; 289 } 290 291 /* 292 * This is do_vis, the central code of vis. 293 * dst: Pointer to the destination buffer 294 * c: Character to encode 295 * flags: Flags word 296 * nextc: The character following 'c' 297 * extra: Pointer to the list of extra characters to be 298 * backslash-protected. 299 */ 300 static wchar_t * 301 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 302 { 303 int iswextra, i, shft; 304 uint64_t bmsk, wmsk; 305 306 iswextra = wcschr(extra, c) != NULL; 307 if (((flags & VIS_ALL) == 0) && 308 !iswextra && 309 (ISGRAPH(flags, c) || iswwhite(c) || 310 ((flags & VIS_SAFE) && iswsafe(c)))) { 311 *dst++ = c; 312 return dst; 313 } 314 315 /* See comment in istrsenvisx() output loop, below. */ 316 wmsk = 0; 317 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 318 shft = i * NBBY; 319 bmsk = (uint64_t)0xffLL << shft; 320 wmsk |= bmsk; 321 if ((c & wmsk) || i == 0) 322 dst = do_mbyte(dst, (wint_t)( 323 (uint64_t)(c & bmsk) >> shft), 324 flags, nextc, iswextra); 325 } 326 327 return dst; 328 } 329 330 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *); 331 332 /* 333 * Return the appropriate encoding function depending on the flags given. 334 */ 335 static visfun_t 336 getvisfun(int flags) 337 { 338 if (flags & VIS_HTTPSTYLE) 339 return do_hvis; 340 if (flags & VIS_MIMESTYLE) 341 return do_mvis; 342 return do_svis; 343 } 344 345 /* 346 * Expand list of extra characters to not visually encode. 347 */ 348 static wchar_t * 349 makeextralist(int flags, const char *src) 350 { 351 wchar_t *dst, *d; 352 size_t len; 353 const wchar_t *s; 354 mbstate_t mbstate; 355 356 bzero(&mbstate, sizeof(mbstate)); 357 len = strlen(src); 358 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL) 359 return NULL; 360 361 if ((flags & VIS_NOLOCALE) || mbsrtowcs(dst, &src, len, &mbstate) == (size_t)-1) { 362 size_t i; 363 for (i = 0; i < len; i++) 364 dst[i] = (wchar_t)(u_char)src[i]; 365 d = dst + len; 366 } else 367 d = dst + wcslen(dst); 368 369 if (flags & VIS_GLOB) 370 for (s = char_glob; *s; *d++ = *s++) 371 continue; 372 373 if (flags & VIS_SHELL) 374 for (s = char_shell; *s; *d++ = *s++) 375 continue; 376 377 if (flags & VIS_SP) *d++ = L' '; 378 if (flags & VIS_TAB) *d++ = L'\t'; 379 if (flags & VIS_NL) *d++ = L'\n'; 380 if (flags & VIS_DQ) *d++ = L'"'; 381 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\'; 382 *d = L'\0'; 383 384 return dst; 385 } 386 387 /* 388 * istrsenvisx() 389 * The main internal function. 390 * All user-visible functions call this one. 391 */ 392 static int 393 istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength, 394 int flags, const char *mbextra, int *cerr_ptr) 395 { 396 wchar_t *dst, *src, *pdst, *psrc, *start, *extra; 397 size_t len, olen; 398 uint64_t bmsk, wmsk; 399 wint_t c; 400 visfun_t f; 401 int clen = 0, cerr, error = -1, i, shft; 402 char *mbdst, *mdst; 403 ssize_t mbslength, maxolen; 404 mbstate_t mbstate; 405 406 _DIAGASSERT(mbdstp != NULL); 407 _DIAGASSERT(mbsrc != NULL || mblength == 0); 408 _DIAGASSERT(mbextra != NULL); 409 410 mbslength = (ssize_t)mblength; 411 /* 412 * When inputing a single character, must also read in the 413 * next character for nextc, the look-ahead character. 414 */ 415 if (mbslength == 1) 416 mbslength++; 417 418 /* 419 * Input (mbsrc) is a char string considered to be multibyte 420 * characters. The input loop will read this string pulling 421 * one character, possibly multiple bytes, from mbsrc and 422 * converting each to wchar_t in src. 423 * 424 * The vis conversion will be done using the wide char 425 * wchar_t string. 426 * 427 * This will then be converted back to a multibyte string to 428 * return to the caller. 429 */ 430 431 /* Allocate space for the wide char strings */ 432 psrc = pdst = extra = NULL; 433 mdst = NULL; 434 if ((psrc = calloc(mbslength + 1, sizeof(*psrc))) == NULL) 435 return -1; 436 if ((pdst = calloc((16 * mbslength) + 1, sizeof(*pdst))) == NULL) 437 goto out; 438 if (*mbdstp == NULL) { 439 if ((mdst = calloc((16 * mbslength) + 1, sizeof(*mdst))) == NULL) 440 goto out; 441 *mbdstp = mdst; 442 } 443 444 mbdst = *mbdstp; 445 dst = pdst; 446 src = psrc; 447 448 if (flags & VIS_NOLOCALE) { 449 /* Do one byte at a time conversion */ 450 cerr = 1; 451 } else { 452 /* Use caller's multibyte conversion error flag. */ 453 cerr = cerr_ptr ? *cerr_ptr : 0; 454 } 455 456 /* 457 * Input loop. 458 * Handle up to mblength characters (not bytes). We do not 459 * stop at NULs because we may be processing a block of data 460 * that includes NULs. 461 */ 462 bzero(&mbstate, sizeof(mbstate)); 463 while (mbslength > 0) { 464 /* Convert one multibyte character to wchar_t. */ 465 if (!cerr) 466 clen = mbrtowc(src, mbsrc, MB_LEN_MAX, &mbstate); 467 if (cerr || clen < 0) { 468 /* Conversion error, process as a byte instead. */ 469 *src = (wint_t)(u_char)*mbsrc; 470 clen = 1; 471 cerr = 1; 472 } 473 if (clen == 0) { 474 /* 475 * NUL in input gives 0 return value. process 476 * as single NUL byte and keep going. 477 */ 478 clen = 1; 479 } 480 /* Advance buffer character pointer. */ 481 src++; 482 /* Advance input pointer by number of bytes read. */ 483 mbsrc += clen; 484 /* Decrement input byte count. */ 485 mbslength -= clen; 486 } 487 len = src - psrc; 488 src = psrc; 489 490 /* 491 * In the single character input case, we will have actually 492 * processed two characters, c and nextc. Reset len back to 493 * just a single character. 494 */ 495 if (mblength < len) 496 len = mblength; 497 498 /* Convert extra argument to list of characters for this mode. */ 499 extra = makeextralist(flags, mbextra); 500 if (!extra) { 501 if (dlen && *dlen == 0) { 502 errno = ENOSPC; 503 goto out; 504 } 505 *mbdst = '\0'; /* can't create extra, return "" */ 506 error = 0; 507 goto out; 508 } 509 510 /* Look up which processing function to call. */ 511 f = getvisfun(flags); 512 513 /* 514 * Main processing loop. 515 * Call do_Xvis processing function one character at a time 516 * with next character available for look-ahead. 517 */ 518 for (start = dst; len > 0; len--) { 519 c = *src++; 520 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra); 521 if (dst == NULL) { 522 errno = ENOSPC; 523 goto out; 524 } 525 } 526 527 /* Terminate the string in the buffer. */ 528 *dst = L'\0'; 529 530 /* 531 * Output loop. 532 * Convert wchar_t string back to multibyte output string. 533 * If we have hit a multi-byte conversion error on input, 534 * output byte-by-byte here. Else use wctomb(). 535 */ 536 len = wcslen(start); 537 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1); 538 olen = 0; 539 bzero(&mbstate, sizeof(mbstate)); 540 for (dst = start; len > 0; len--) { 541 if (!cerr) 542 clen = wcrtomb(mbdst, *dst, &mbstate); 543 if (cerr || clen < 0) { 544 /* 545 * Conversion error, process as a byte(s) instead. 546 * Examine each byte and higher-order bytes for 547 * data. E.g., 548 * 0x000000000000a264 -> a2 64 549 * 0x000000001f00a264 -> 1f 00 a2 64 550 */ 551 clen = 0; 552 wmsk = 0; 553 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 554 shft = i * NBBY; 555 bmsk = (uint64_t)0xffLL << shft; 556 wmsk |= bmsk; 557 if ((*dst & wmsk) || i == 0) 558 mbdst[clen++] = (char)( 559 (uint64_t)(*dst & bmsk) >> 560 shft); 561 } 562 cerr = 1; 563 } 564 /* If this character would exceed our output limit, stop. */ 565 if (olen + clen > (size_t)maxolen) 566 break; 567 /* Advance output pointer by number of bytes written. */ 568 mbdst += clen; 569 /* Advance buffer character pointer. */ 570 dst++; 571 /* Incrment output character count. */ 572 olen += clen; 573 } 574 575 /* Terminate the output string. */ 576 *mbdst = '\0'; 577 578 if (flags & VIS_NOLOCALE) { 579 /* Pass conversion error flag out. */ 580 if (cerr_ptr) 581 *cerr_ptr = cerr; 582 } 583 584 free(extra); 585 free(pdst); 586 free(psrc); 587 588 return (int)olen; 589 out: 590 free(extra); 591 free(pdst); 592 free(psrc); 593 free(mdst); 594 return error; 595 } 596 597 static int 598 istrsenvisxl(char **mbdstp, size_t *dlen, const char *mbsrc, 599 int flags, const char *mbextra, int *cerr_ptr) 600 { 601 return istrsenvisx(mbdstp, dlen, mbsrc, 602 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr); 603 } 604 605 #endif 606 607 #if !HAVE_SVIS 608 /* 609 * The "svis" variants all take an "extra" arg that is a pointer 610 * to a NUL-terminated list of characters to be encoded, too. 611 * These functions are useful e. g. to encode strings in such a 612 * way so that they are not interpreted by a shell. 613 */ 614 615 char * 616 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra) 617 { 618 char cc[2]; 619 int ret; 620 621 cc[0] = c; 622 cc[1] = nextc; 623 624 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, mbextra, NULL); 625 if (ret < 0) 626 return NULL; 627 return mbdst + ret; 628 } 629 630 char * 631 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra) 632 { 633 char cc[2]; 634 int ret; 635 636 cc[0] = c; 637 cc[1] = nextc; 638 639 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, mbextra, NULL); 640 if (ret < 0) 641 return NULL; 642 return mbdst + ret; 643 } 644 645 int 646 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra) 647 { 648 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, mbextra, NULL); 649 } 650 651 int 652 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra) 653 { 654 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, mbextra, NULL); 655 } 656 657 int 658 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra) 659 { 660 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, mbextra, NULL); 661 } 662 663 int 664 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 665 const char *mbextra) 666 { 667 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, NULL); 668 } 669 670 int 671 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 672 const char *mbextra, int *cerr_ptr) 673 { 674 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr); 675 } 676 #endif 677 678 #if !HAVE_VIS 679 /* 680 * vis - visually encode characters 681 */ 682 char * 683 vis(char *mbdst, int c, int flags, int nextc) 684 { 685 char cc[2]; 686 int ret; 687 688 cc[0] = c; 689 cc[1] = nextc; 690 691 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, "", NULL); 692 if (ret < 0) 693 return NULL; 694 return mbdst + ret; 695 } 696 697 char * 698 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc) 699 { 700 char cc[2]; 701 int ret; 702 703 cc[0] = c; 704 cc[1] = nextc; 705 706 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, "", NULL); 707 if (ret < 0) 708 return NULL; 709 return mbdst + ret; 710 } 711 712 /* 713 * strvis - visually encode characters from src into dst 714 * 715 * Dst must be 4 times the size of src to account for possible 716 * expansion. The length of dst, not including the trailing NULL, 717 * is returned. 718 */ 719 720 int 721 strvis(char *mbdst, const char *mbsrc, int flags) 722 { 723 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, "", NULL); 724 } 725 726 int 727 strnvis(char *dst, const char *src, size_t len, int flag) 728 { 729 return istrsenvisxl(&dst, &len, src, flag, "", NULL); 730 } 731 732 int 733 stravis(char **mbdstp, const char *mbsrc, int flags) 734 { 735 *mbdstp = NULL; 736 return istrsenvisxl(mbdstp, NULL, mbsrc, flags, "", NULL); 737 } 738 739 /* 740 * strvisx - visually encode characters from src into dst 741 * 742 * Dst must be 4 times the size of src to account for possible 743 * expansion. The length of dst, not including the trailing NULL, 744 * is returned. 745 * 746 * Strvisx encodes exactly len characters from src into dst. 747 * This is useful for encoding a block of data. 748 */ 749 750 int 751 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags) 752 { 753 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, "", NULL); 754 } 755 756 int 757 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags) 758 { 759 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", NULL); 760 } 761 762 int 763 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 764 int *cerr_ptr) 765 { 766 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr); 767 } 768 #endif 769