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