vis.c revision 1.66
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 <sys/cdefs.h> 59 #if defined(LIBC_SCCS) && !defined(lint) 60 __RCSID("$NetBSD: vis.c,v 1.66 2014/09/26 15:58:59 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 case L'$': /* vis(1) -l */ 233 break; 234 default: 235 if (iswgraph(c) && !iswoctal(c)) { 236 *dst++ = L'\\'; 237 *dst++ = c; 238 return dst; 239 } 240 } 241 } 242 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) { 243 *dst++ = L'\\'; 244 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0'; 245 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0'; 246 *dst++ = (c & 07) + L'0'; 247 } else { 248 if ((flags & VIS_NOSLASH) == 0) 249 *dst++ = L'\\'; 250 251 if (c & 0200) { 252 c &= 0177; 253 *dst++ = L'M'; 254 } 255 256 if (iswcntrl(c)) { 257 *dst++ = L'^'; 258 if (c == 0177) 259 *dst++ = L'?'; 260 else 261 *dst++ = c + L'@'; 262 } else { 263 *dst++ = L'-'; 264 *dst++ = c; 265 } 266 } 267 268 return dst; 269 } 270 271 /* 272 * This is do_vis, the central code of vis. 273 * dst: Pointer to the destination buffer 274 * c: Character to encode 275 * flags: Flags word 276 * nextc: The character following 'c' 277 * extra: Pointer to the list of extra characters to be 278 * backslash-protected. 279 */ 280 static wchar_t * 281 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 282 { 283 int iswextra, i, shft; 284 uint64_t bmsk, wmsk; 285 286 iswextra = wcschr(extra, c) != NULL; 287 if (!iswextra && (iswgraph(c) || iswwhite(c) || 288 ((flags & VIS_SAFE) && iswsafe(c)))) { 289 *dst++ = c; 290 return dst; 291 } 292 293 /* See comment in istrsenvisx() output loop, below. */ 294 wmsk = 0; 295 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 296 shft = i * NBBY; 297 bmsk = (uint64_t)0xffLL << shft; 298 wmsk |= bmsk; 299 if ((c & wmsk) || i == 0) 300 dst = do_mbyte(dst, (wint_t)( 301 (uint64_t)(c & bmsk) >> shft), 302 flags, nextc, iswextra); 303 } 304 305 return dst; 306 } 307 308 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *); 309 310 /* 311 * Return the appropriate encoding function depending on the flags given. 312 */ 313 static visfun_t 314 getvisfun(int flags) 315 { 316 if (flags & VIS_HTTPSTYLE) 317 return do_hvis; 318 if (flags & VIS_MIMESTYLE) 319 return do_mvis; 320 return do_svis; 321 } 322 323 /* 324 * Expand list of extra characters to not visually encode. 325 */ 326 static wchar_t * 327 makeextralist(int flags, const char *src) 328 { 329 wchar_t *dst, *d; 330 size_t len; 331 const wchar_t *s; 332 333 len = strlen(src); 334 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL) 335 return NULL; 336 337 if (mbstowcs(dst, src, len) == (size_t)-1) { 338 size_t i; 339 for (i = 0; i < len; i++) 340 dst[i] = (wchar_t)(u_char)src[i]; 341 d = dst + len; 342 } else 343 d = dst + wcslen(dst); 344 345 if (flags & VIS_GLOB) 346 for (s = char_glob; *s; *d++ = *s++) 347 continue; 348 349 if (flags & VIS_SHELL) 350 for (s = char_shell; *s; *d++ = *s++) 351 continue; 352 353 if (flags & VIS_SP) *d++ = L' '; 354 if (flags & VIS_TAB) *d++ = L'\t'; 355 if (flags & VIS_NL) *d++ = L'\n'; 356 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\'; 357 *d = L'\0'; 358 359 return dst; 360 } 361 362 /* 363 * istrsenvisx() 364 * The main internal function. 365 * All user-visible functions call this one. 366 */ 367 static int 368 istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength, 369 int flags, const char *mbextra, int *cerr_ptr) 370 { 371 wchar_t *dst, *src, *pdst, *psrc, *start, *extra; 372 size_t len, olen; 373 uint64_t bmsk, wmsk; 374 wint_t c; 375 visfun_t f; 376 int clen = 0, cerr = 0, error = -1, i, shft; 377 ssize_t mbslength, maxolen; 378 379 _DIAGASSERT(mbdst != NULL); 380 _DIAGASSERT(mbsrc != NULL || mblength == 0); 381 _DIAGASSERT(mbextra != NULL); 382 383 /* 384 * Input (mbsrc) is a char string considered to be multibyte 385 * characters. The input loop will read this string pulling 386 * one character, possibly multiple bytes, from mbsrc and 387 * converting each to wchar_t in src. 388 * 389 * The vis conversion will be done using the wide char 390 * wchar_t string. 391 * 392 * This will then be converted back to a multibyte string to 393 * return to the caller. 394 */ 395 396 /* Allocate space for the wide char strings */ 397 psrc = pdst = extra = NULL; 398 if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL) 399 return -1; 400 if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL) 401 goto out; 402 dst = pdst; 403 src = psrc; 404 405 /* Use caller's multibyte conversion error flag. */ 406 if (cerr_ptr) 407 cerr = *cerr_ptr; 408 409 /* 410 * Input loop. 411 * Handle up to mblength characters (not bytes). We do not 412 * stop at NULs because we may be processing a block of data 413 * that includes NULs. 414 */ 415 mbslength = (ssize_t)mblength; 416 /* 417 * When inputing a single character, must also read in the 418 * next character for nextc, the look-ahead character. 419 */ 420 if (mbslength == 1) 421 mbslength++; 422 while (mbslength > 0) { 423 /* Convert one multibyte character to wchar_t. */ 424 if (!cerr) 425 clen = mbtowc(src, mbsrc, MB_LEN_MAX); 426 if (cerr || clen < 0) { 427 /* Conversion error, process as a byte instead. */ 428 *src = (wint_t)(u_char)*mbsrc; 429 clen = 1; 430 cerr = 1; 431 } 432 if (clen == 0) 433 /* 434 * NUL in input gives 0 return value. process 435 * as single NUL byte and keep going. 436 */ 437 clen = 1; 438 /* Advance buffer character pointer. */ 439 src++; 440 /* Advance input pointer by number of bytes read. */ 441 mbsrc += clen; 442 /* Decrement input byte count. */ 443 mbslength -= clen; 444 } 445 len = src - psrc; 446 src = psrc; 447 /* 448 * In the single character input case, we will have actually 449 * processed two characters, c and nextc. Reset len back to 450 * just a single character. 451 */ 452 if (mblength < len) 453 len = mblength; 454 455 /* Convert extra argument to list of characters for this mode. */ 456 extra = makeextralist(flags, mbextra); 457 if (!extra) { 458 if (dlen && *dlen == 0) { 459 errno = ENOSPC; 460 goto out; 461 } 462 *mbdst = '\0'; /* can't create extra, return "" */ 463 error = 0; 464 goto out; 465 } 466 467 /* Look up which processing function to call. */ 468 f = getvisfun(flags); 469 470 /* 471 * Main processing loop. 472 * Call do_Xvis processing function one character at a time 473 * with next character available for look-ahead. 474 */ 475 for (start = dst; len > 0; len--) { 476 c = *src++; 477 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra); 478 if (dst == NULL) { 479 errno = ENOSPC; 480 goto out; 481 } 482 } 483 484 /* Terminate the string in the buffer. */ 485 *dst = L'\0'; 486 487 /* 488 * Output loop. 489 * Convert wchar_t string back to multibyte output string. 490 * If we have hit a multi-byte conversion error on input, 491 * output byte-by-byte here. Else use wctomb(). 492 */ 493 len = wcslen(start); 494 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1); 495 olen = 0; 496 for (dst = start; len > 0; len--) { 497 if (!cerr) 498 clen = wctomb(mbdst, *dst); 499 if (cerr || clen < 0) { 500 /* 501 * Conversion error, process as a byte(s) instead. 502 * Examine each byte and higher-order bytes for 503 * data. E.g., 504 * 0x000000000000a264 -> a2 64 505 * 0x000000001f00a264 -> 1f 00 a2 64 506 */ 507 clen = 0; 508 wmsk = 0; 509 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 510 shft = i * NBBY; 511 bmsk = (uint64_t)0xffLL << shft; 512 wmsk |= bmsk; 513 if ((*dst & wmsk) || i == 0) 514 mbdst[clen++] = (char)( 515 (uint64_t)(*dst & bmsk) >> 516 shft); 517 } 518 cerr = 1; 519 } 520 /* If this character would exceed our output limit, stop. */ 521 if (olen + clen > (size_t)maxolen) 522 break; 523 /* Advance output pointer by number of bytes written. */ 524 mbdst += clen; 525 /* Advance buffer character pointer. */ 526 dst++; 527 /* Incrment output character count. */ 528 olen += clen; 529 } 530 531 /* Terminate the output string. */ 532 *mbdst = '\0'; 533 534 /* Pass conversion error flag out. */ 535 if (cerr_ptr) 536 *cerr_ptr = cerr; 537 538 free(extra); 539 free(pdst); 540 free(psrc); 541 542 return (int)olen; 543 out: 544 free(extra); 545 free(pdst); 546 free(psrc); 547 return error; 548 } 549 550 static int 551 istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc, 552 int flags, const char *mbextra, int *cerr_ptr) 553 { 554 return istrsenvisx(mbdst, dlen, mbsrc, 555 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr); 556 } 557 558 #endif 559 560 #if !HAVE_SVIS 561 /* 562 * The "svis" variants all take an "extra" arg that is a pointer 563 * to a NUL-terminated list of characters to be encoded, too. 564 * These functions are useful e. g. to encode strings in such a 565 * way so that they are not interpreted by a shell. 566 */ 567 568 char * 569 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra) 570 { 571 char cc[2]; 572 int ret; 573 574 cc[0] = c; 575 cc[1] = nextc; 576 577 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL); 578 if (ret < 0) 579 return NULL; 580 return mbdst + ret; 581 } 582 583 char * 584 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra) 585 { 586 char cc[2]; 587 int ret; 588 589 cc[0] = c; 590 cc[1] = nextc; 591 592 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL); 593 if (ret < 0) 594 return NULL; 595 return mbdst + ret; 596 } 597 598 int 599 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra) 600 { 601 return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL); 602 } 603 604 int 605 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra) 606 { 607 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL); 608 } 609 610 int 611 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra) 612 { 613 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL); 614 } 615 616 int 617 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 618 const char *mbextra) 619 { 620 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL); 621 } 622 623 int 624 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 625 const char *mbextra, int *cerr_ptr) 626 { 627 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr); 628 } 629 #endif 630 631 #if !HAVE_VIS 632 /* 633 * vis - visually encode characters 634 */ 635 char * 636 vis(char *mbdst, int c, int flags, int nextc) 637 { 638 char cc[2]; 639 int ret; 640 641 cc[0] = c; 642 cc[1] = nextc; 643 644 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL); 645 if (ret < 0) 646 return NULL; 647 return mbdst + ret; 648 } 649 650 char * 651 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc) 652 { 653 char cc[2]; 654 int ret; 655 656 cc[0] = c; 657 cc[1] = nextc; 658 659 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL); 660 if (ret < 0) 661 return NULL; 662 return mbdst + ret; 663 } 664 665 /* 666 * strvis - visually encode characters from src into dst 667 * 668 * Dst must be 4 times the size of src to account for possible 669 * expansion. The length of dst, not including the trailing NULL, 670 * is returned. 671 */ 672 673 int 674 strvis(char *mbdst, const char *mbsrc, int flags) 675 { 676 return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL); 677 } 678 679 int 680 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags) 681 { 682 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL); 683 } 684 685 /* 686 * strvisx - visually encode characters from src into dst 687 * 688 * Dst must be 4 times the size of src to account for possible 689 * expansion. The length of dst, not including the trailing NULL, 690 * is returned. 691 * 692 * Strvisx encodes exactly len characters from src into dst. 693 * This is useful for encoding a block of data. 694 */ 695 696 int 697 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags) 698 { 699 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL); 700 } 701 702 int 703 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags) 704 { 705 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL); 706 } 707 708 int 709 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 710 int *cerr_ptr) 711 { 712 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr); 713 } 714 #endif 715
Indexes created Mon Sep 22 13:09:51 GMT 2025