vis.c revision 1.65
1 /* $NetBSD: vis.c,v 1.65 2014/09/26 13:48:00 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 <sys/cdefs.h> 59 #if defined(LIBC_SCCS) && !defined(lint) 60 __RCSID("$NetBSD: vis.c,v 1.65 2014/09/26 13:48:00 roy Exp $"); 61 #endif /* LIBC_SCCS and not lint */ 62 #ifdef __FBSDID 63 __FBSDID("$FreeBSD$"); 64 #define _DIAGASSERT(x) assert(x) 65 #endif 66 67 #include "namespace.h" 68 #include <sys/types.h> 69 #include <sys/param.h> 70 71 #include <assert.h> 72 #include <vis.h> 73 #include <errno.h> 74 #include <stdlib.h> 75 #include <wchar.h> 76 #include <wctype.h> 77 78 #ifdef __weak_alias 79 __weak_alias(strvisx,_strvisx) 80 #endif 81 82 #if !HAVE_VIS || !HAVE_SVIS 83 #include <ctype.h> 84 #include <limits.h> 85 #include <stdio.h> 86 #include <string.h> 87 88 /* 89 * The reason for going through the trouble to deal with character encodings 90 * in vis(3), is that we use this to safe encode output of commands. This 91 * safe encoding varies depending on the character set. For example if we 92 * display ps output in French, we don't want to display French characters 93 * as M-foo. 94 */ 95 96 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *); 97 98 #undef BELL 99 #define BELL L'\a' 100 101 #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7') 102 #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n') 103 #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r') 104 #define xtoa(c) L"0123456789abcdef"[c] 105 #define XTOA(c) L"0123456789ABCDEF"[c] 106 107 #define MAXEXTRAS 30 108 109 static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~"; 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 CTASSERT(MB_LEN_MAX <= sizeof(uint64_t)); 133 #endif /* !__NetBSD__ */ 134 #endif 135 136 /* 137 * This is do_hvis, for HTTP style (RFC 1808) 138 */ 139 static wchar_t * 140 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 141 { 142 if (iswalnum(c) 143 /* safe */ 144 || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+' 145 /* extra */ 146 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')' 147 || c == L',') 148 dst = do_svis(dst, c, flags, nextc, extra); 149 else { 150 *dst++ = L'%'; 151 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf); 152 *dst++ = xtoa((unsigned int)c & 0xf); 153 } 154 155 return dst; 156 } 157 158 /* 159 * This is do_mvis, for Quoted-Printable MIME (RFC 2045) 160 * NB: No handling of long lines or CRLF. 161 */ 162 static wchar_t * 163 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 164 { 165 if ((c != L'\n') && 166 /* Space at the end of the line */ 167 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) || 168 /* Out of range */ 169 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) || 170 /* Specific char to be escaped */ 171 wcschr(L"#$@[\\]^`{|}~", c) != NULL)) { 172 *dst++ = L'='; 173 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf); 174 *dst++ = XTOA((unsigned int)c & 0xf); 175 } else 176 dst = do_svis(dst, c, flags, nextc, extra); 177 return dst; 178 } 179 180 /* 181 * Output single byte of multibyte character. 182 */ 183 static wchar_t * 184 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra) 185 { 186 if (flags & VIS_CSTYLE) { 187 switch (c) { 188 case L'\n': 189 *dst++ = L'\\'; *dst++ = L'n'; 190 return dst; 191 case L'\r': 192 *dst++ = L'\\'; *dst++ = L'r'; 193 return dst; 194 case L'\b': 195 *dst++ = L'\\'; *dst++ = L'b'; 196 return dst; 197 case BELL: 198 *dst++ = L'\\'; *dst++ = L'a'; 199 return dst; 200 case L'\v': 201 *dst++ = L'\\'; *dst++ = L'v'; 202 return dst; 203 case L'\t': 204 *dst++ = L'\\'; *dst++ = L't'; 205 return dst; 206 case L'\f': 207 *dst++ = L'\\'; *dst++ = L'f'; 208 return dst; 209 case L' ': 210 *dst++ = L'\\'; *dst++ = L's'; 211 return dst; 212 case L'\0': 213 *dst++ = L'\\'; *dst++ = L'0'; 214 if (iswoctal(nextc)) { 215 *dst++ = L'0'; 216 *dst++ = L'0'; 217 } 218 return dst; 219 /* We cannot encode these characters in VIS_CSTYLE 220 * because they special meaning */ 221 case L'n': 222 case L'r': 223 case L'b': 224 case L'a': 225 case L'v': 226 case L't': 227 case L'f': 228 case L's': 229 case L'0': 230 case L'M': 231 case L'^': 232 break; 233 default: 234 if (iswgraph(c) && !iswoctal(c)) { 235 *dst++ = L'\\'; 236 *dst++ = c; 237 return dst; 238 } 239 } 240 } 241 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) { 242 *dst++ = L'\\'; 243 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0'; 244 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0'; 245 *dst++ = (c & 07) + L'0'; 246 } else { 247 if ((flags & VIS_NOSLASH) == 0) 248 *dst++ = L'\\'; 249 250 if (c & 0200) { 251 c &= 0177; 252 *dst++ = L'M'; 253 } 254 255 if (iswcntrl(c)) { 256 *dst++ = L'^'; 257 if (c == 0177) 258 *dst++ = L'?'; 259 else 260 *dst++ = c + L'@'; 261 } else { 262 *dst++ = L'-'; 263 *dst++ = c; 264 } 265 } 266 267 return dst; 268 } 269 270 /* 271 * This is do_vis, the central code of vis. 272 * dst: Pointer to the destination buffer 273 * c: Character to encode 274 * flags: Flags word 275 * nextc: The character following 'c' 276 * extra: Pointer to the list of extra characters to be 277 * backslash-protected. 278 */ 279 static wchar_t * 280 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 281 { 282 int iswextra, i, shft; 283 uint64_t bmsk, wmsk; 284 285 iswextra = wcschr(extra, c) != NULL; 286 if (!iswextra && (iswgraph(c) || iswwhite(c) || 287 ((flags & VIS_SAFE) && iswsafe(c)))) { 288 *dst++ = c; 289 return dst; 290 } 291 292 /* See comment in istrsenvisx() output loop, below. */ 293 wmsk = 0; 294 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 295 shft = i * NBBY; 296 bmsk = (uint64_t)0xffLL << shft; 297 wmsk |= bmsk; 298 if ((c & wmsk) || i == 0) 299 dst = do_mbyte(dst, (wint_t)( 300 (uint64_t)(c & bmsk) >> shft), 301 flags, nextc, iswextra); 302 } 303 304 return dst; 305 } 306 307 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *); 308 309 /* 310 * Return the appropriate encoding function depending on the flags given. 311 */ 312 static visfun_t 313 getvisfun(int flags) 314 { 315 if (flags & VIS_HTTPSTYLE) 316 return do_hvis; 317 if (flags & VIS_MIMESTYLE) 318 return do_mvis; 319 return do_svis; 320 } 321 322 /* 323 * Expand list of extra characters to not visually encode. 324 */ 325 static wchar_t * 326 makeextralist(int flags, const char *src) 327 { 328 wchar_t *dst, *d; 329 size_t len; 330 const wchar_t *s; 331 332 len = strlen(src); 333 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL) 334 return NULL; 335 336 if (mbstowcs(dst, src, len) == (size_t)-1) { 337 size_t i; 338 for (i = 0; i < len; i++) 339 dst[i] = (wchar_t)(u_char)src[i]; 340 d = dst + len; 341 } else 342 d = dst + wcslen(dst); 343 344 if (flags & VIS_GLOB) 345 for (s = char_glob; *s; *d++ = *s++) 346 continue; 347 348 if (flags & VIS_SHELL) 349 for (s = char_shell; *s; *d++ = *s++) 350 continue; 351 352 if (flags & VIS_SP) *d++ = L' '; 353 if (flags & VIS_TAB) *d++ = L'\t'; 354 if (flags & VIS_NL) *d++ = L'\n'; 355 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\'; 356 *d = L'\0'; 357 358 return dst; 359 } 360 361 /* 362 * istrsenvisx() 363 * The main internal function. 364 * All user-visible functions call this one. 365 */ 366 static int 367 istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength, 368 int flags, const char *mbextra, int *cerr_ptr) 369 { 370 wchar_t *dst, *src, *pdst, *psrc, *start, *extra; 371 size_t len, olen; 372 uint64_t bmsk, wmsk; 373 wint_t c; 374 visfun_t f; 375 int clen = 0, cerr = 0, error = -1, i, shft; 376 ssize_t mbslength, maxolen; 377 378 _DIAGASSERT(mbdst != NULL); 379 _DIAGASSERT(mbsrc != NULL || mblength == 0); 380 _DIAGASSERT(mbextra != NULL); 381 382 /* 383 * Input (mbsrc) is a char string considered to be multibyte 384 * characters. The input loop will read this string pulling 385 * one character, possibly multiple bytes, from mbsrc and 386 * converting each to wchar_t in src. 387 * 388 * The vis conversion will be done using the wide char 389 * wchar_t string. 390 * 391 * This will then be converted back to a multibyte string to 392 * return to the caller. 393 */ 394 395 /* Allocate space for the wide char strings */ 396 psrc = pdst = extra = NULL; 397 if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL) 398 return -1; 399 if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL) 400 goto out; 401 dst = pdst; 402 src = psrc; 403 404 /* Use caller's multibyte conversion error flag. */ 405 if (cerr_ptr) 406 cerr = *cerr_ptr; 407 408 /* 409 * Input loop. 410 * Handle up to mblength characters (not bytes). We do not 411 * stop at NULs because we may be processing a block of data 412 * that includes NULs. 413 */ 414 mbslength = (ssize_t)mblength; 415 /* 416 * When inputing a single character, must also read in the 417 * next character for nextc, the look-ahead character. 418 */ 419 if (mbslength == 1) 420 mbslength++; 421 while (mbslength > 0) { 422 /* Convert one multibyte character to wchar_t. */ 423 if (!cerr) 424 clen = mbtowc(src, mbsrc, MB_LEN_MAX); 425 if (cerr || clen < 0) { 426 /* Conversion error, process as a byte instead. */ 427 *src = (wint_t)(u_char)*mbsrc; 428 clen = 1; 429 cerr = 1; 430 } 431 if (clen == 0) 432 /* 433 * NUL in input gives 0 return value. process 434 * as single NUL byte and keep going. 435 */ 436 clen = 1; 437 /* Advance buffer character pointer. */ 438 src++; 439 /* Advance input pointer by number of bytes read. */ 440 mbsrc += clen; 441 /* Decrement input byte count. */ 442 mbslength -= clen; 443 } 444 len = src - psrc; 445 src = psrc; 446 /* 447 * In the single character input case, we will have actually 448 * processed two characters, c and nextc. Reset len back to 449 * just a single character. 450 */ 451 if (mblength < len) 452 len = mblength; 453 454 /* Convert extra argument to list of characters for this mode. */ 455 extra = makeextralist(flags, mbextra); 456 if (!extra) { 457 if (dlen && *dlen == 0) { 458 errno = ENOSPC; 459 goto out; 460 } 461 *mbdst = '\0'; /* can't create extra, return "" */ 462 error = 0; 463 goto out; 464 } 465 466 /* Look up which processing function to call. */ 467 f = getvisfun(flags); 468 469 /* 470 * Main processing loop. 471 * Call do_Xvis processing function one character at a time 472 * with next character available for look-ahead. 473 */ 474 for (start = dst; len > 0; len--) { 475 c = *src++; 476 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra); 477 if (dst == NULL) { 478 errno = ENOSPC; 479 goto out; 480 } 481 } 482 483 /* Terminate the string in the buffer. */ 484 *dst = L'\0'; 485 486 /* 487 * Output loop. 488 * Convert wchar_t string back to multibyte output string. 489 * If we have hit a multi-byte conversion error on input, 490 * output byte-by-byte here. Else use wctomb(). 491 */ 492 len = wcslen(start); 493 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1); 494 olen = 0; 495 for (dst = start; len > 0; len--) { 496 if (!cerr) 497 clen = wctomb(mbdst, *dst); 498 if (cerr || clen < 0) { 499 /* 500 * Conversion error, process as a byte(s) instead. 501 * Examine each byte and higher-order bytes for 502 * data. E.g., 503 * 0x000000000000a264 -> a2 64 504 * 0x000000001f00a264 -> 1f 00 a2 64 505 */ 506 clen = 0; 507 wmsk = 0; 508 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 509 shft = i * NBBY; 510 bmsk = (uint64_t)0xffLL << shft; 511 wmsk |= bmsk; 512 if ((*dst & wmsk) || i == 0) 513 mbdst[clen++] = (char)( 514 (uint64_t)(*dst & bmsk) >> 515 shft); 516 } 517 cerr = 1; 518 } 519 /* If this character would exceed our output limit, stop. */ 520 if (olen + clen > (size_t)maxolen) 521 break; 522 /* Advance output pointer by number of bytes written. */ 523 mbdst += clen; 524 /* Advance buffer character pointer. */ 525 dst++; 526 /* Incrment output character count. */ 527 olen += clen; 528 } 529 530 /* Terminate the output string. */ 531 *mbdst = '\0'; 532 533 /* Pass conversion error flag out. */ 534 if (cerr_ptr) 535 *cerr_ptr = cerr; 536 537 free(extra); 538 free(pdst); 539 free(psrc); 540 541 return (int)olen; 542 out: 543 free(extra); 544 free(pdst); 545 free(psrc); 546 return error; 547 } 548 549 static int 550 istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc, 551 int flags, const char *mbextra, int *cerr_ptr) 552 { 553 return istrsenvisx(mbdst, dlen, mbsrc, 554 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr); 555 } 556 557 #endif 558 559 #if !HAVE_SVIS 560 /* 561 * The "svis" variants all take an "extra" arg that is a pointer 562 * to a NUL-terminated list of characters to be encoded, too. 563 * These functions are useful e. g. to encode strings in such a 564 * way so that they are not interpreted by a shell. 565 */ 566 567 char * 568 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra) 569 { 570 char cc[2]; 571 int ret; 572 573 cc[0] = c; 574 cc[1] = nextc; 575 576 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL); 577 if (ret < 0) 578 return NULL; 579 return mbdst + ret; 580 } 581 582 char * 583 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra) 584 { 585 char cc[2]; 586 int ret; 587 588 cc[0] = c; 589 cc[1] = nextc; 590 591 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL); 592 if (ret < 0) 593 return NULL; 594 return mbdst + ret; 595 } 596 597 int 598 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra) 599 { 600 return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL); 601 } 602 603 int 604 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra) 605 { 606 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL); 607 } 608 609 int 610 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra) 611 { 612 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL); 613 } 614 615 int 616 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 617 const char *mbextra) 618 { 619 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL); 620 } 621 622 int 623 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 624 const char *mbextra, int *cerr_ptr) 625 { 626 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr); 627 } 628 #endif 629 630 #if !HAVE_VIS 631 /* 632 * vis - visually encode characters 633 */ 634 char * 635 vis(char *mbdst, int c, int flags, int nextc) 636 { 637 char cc[2]; 638 int ret; 639 640 cc[0] = c; 641 cc[1] = nextc; 642 643 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL); 644 if (ret < 0) 645 return NULL; 646 return mbdst + ret; 647 } 648 649 char * 650 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc) 651 { 652 char cc[2]; 653 int ret; 654 655 cc[0] = c; 656 cc[1] = nextc; 657 658 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL); 659 if (ret < 0) 660 return NULL; 661 return mbdst + ret; 662 } 663 664 /* 665 * strvis - visually encode characters from src into dst 666 * 667 * Dst must be 4 times the size of src to account for possible 668 * expansion. The length of dst, not including the trailing NULL, 669 * is returned. 670 */ 671 672 int 673 strvis(char *mbdst, const char *mbsrc, int flags) 674 { 675 return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL); 676 } 677 678 int 679 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags) 680 { 681 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL); 682 } 683 684 /* 685 * strvisx - visually encode characters from src into dst 686 * 687 * Dst must be 4 times the size of src to account for possible 688 * expansion. The length of dst, not including the trailing NULL, 689 * is returned. 690 * 691 * Strvisx encodes exactly len characters from src into dst. 692 * This is useful for encoding a block of data. 693 */ 694 695 int 696 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags) 697 { 698 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL); 699 } 700 701 int 702 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags) 703 { 704 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL); 705 } 706 707 int 708 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 709 int *cerr_ptr) 710 { 711 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr); 712 } 713 #endif 714
Indexes created Wed Sep 24 22:09:59 GMT 2025