vis.c revision 1.63
1 /* $NetBSD: vis.c,v 1.63 2014/09/26 01:21:07 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 <sys/cdefs.h> 59 #if defined(LIBC_SCCS) && !defined(lint) 60 __RCSID("$NetBSD: vis.c,v 1.63 2014/09/26 01:21:07 christos 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 default: 220 if (iswgraph(c)) { 221 *dst++ = L'\\'; 222 *dst++ = c; 223 return dst; 224 } 225 } 226 } 227 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) { 228 *dst++ = L'\\'; 229 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0'; 230 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0'; 231 *dst++ = (c & 07) + L'0'; 232 } else { 233 if ((flags & VIS_NOSLASH) == 0) 234 *dst++ = L'\\'; 235 236 if (c & 0200) { 237 c &= 0177; 238 *dst++ = L'M'; 239 } 240 241 if (iswcntrl(c)) { 242 *dst++ = L'^'; 243 if (c == 0177) 244 *dst++ = L'?'; 245 else 246 *dst++ = c + L'@'; 247 } else { 248 *dst++ = L'-'; 249 *dst++ = c; 250 } 251 } 252 253 return dst; 254 } 255 256 /* 257 * This is do_vis, the central code of vis. 258 * dst: Pointer to the destination buffer 259 * c: Character to encode 260 * flags: Flags word 261 * nextc: The character following 'c' 262 * extra: Pointer to the list of extra characters to be 263 * backslash-protected. 264 */ 265 static wchar_t * 266 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 267 { 268 int iswextra, i, shft; 269 uint64_t bmsk, wmsk; 270 271 iswextra = wcschr(extra, c) != NULL; 272 if (!iswextra && (iswgraph(c) || iswwhite(c) || 273 ((flags & VIS_SAFE) && iswsafe(c)))) { 274 *dst++ = c; 275 return dst; 276 } 277 278 /* See comment in istrsenvisx() output loop, below. */ 279 wmsk = 0; 280 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 281 shft = i * NBBY; 282 bmsk = (uint64_t)0xffLL << shft; 283 wmsk |= bmsk; 284 if ((c & wmsk) || i == 0) 285 dst = do_mbyte(dst, (wint_t)( 286 (uint64_t)(c & bmsk) >> shft), 287 flags, nextc, iswextra); 288 } 289 290 return dst; 291 } 292 293 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *); 294 295 /* 296 * Return the appropriate encoding function depending on the flags given. 297 */ 298 static visfun_t 299 getvisfun(int flags) 300 { 301 if (flags & VIS_HTTPSTYLE) 302 return do_hvis; 303 if (flags & VIS_MIMESTYLE) 304 return do_mvis; 305 return do_svis; 306 } 307 308 /* 309 * Expand list of extra characters to not visually encode. 310 */ 311 static wchar_t * 312 makeextralist(int flags, const char *src) 313 { 314 wchar_t *dst, *d; 315 size_t len; 316 317 len = strlen(src); 318 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL) 319 return NULL; 320 321 if (mbstowcs(dst, src, len) == (size_t)-1) { 322 size_t i; 323 for (i = 0; i < len; i++) 324 dst[i] = (wchar_t)(u_char)src[i]; 325 d = dst + len; 326 } else 327 d = dst + wcslen(dst); 328 329 if (flags & VIS_GLOB) 330 for (const wchar_t *s = char_glob; *s; *d++ = *s++) 331 continue; 332 333 if (flags & VIS_SHELL) 334 for (const wchar_t *s = char_shell; *s; *d++ = *s++) 335 continue; 336 337 if (flags & VIS_SP) *d++ = L' '; 338 if (flags & VIS_TAB) *d++ = L'\t'; 339 if (flags & VIS_NL) *d++ = L'\n'; 340 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\'; 341 *d = L'\0'; 342 343 return dst; 344 } 345 346 /* 347 * istrsenvisx() 348 * The main internal function. 349 * All user-visible functions call this one. 350 */ 351 static int 352 istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength, 353 int flags, const char *mbextra, int *cerr_ptr) 354 { 355 wchar_t *dst, *src, *pdst, *psrc, *start, *extra; 356 size_t len, olen; 357 uint64_t bmsk, wmsk; 358 wint_t c; 359 visfun_t f; 360 int clen = 0, cerr = 0, error = -1, i, shft; 361 ssize_t mbslength, maxolen; 362 363 _DIAGASSERT(mbdst != NULL); 364 _DIAGASSERT(mbsrc != NULL || mblength == 0); 365 _DIAGASSERT(mbextra != NULL); 366 367 /* 368 * Input (mbsrc) is a char string considered to be multibyte 369 * characters. The input loop will read this string pulling 370 * one character, possibly multiple bytes, from mbsrc and 371 * converting each to wchar_t in src. 372 * 373 * The vis conversion will be done using the wide char 374 * wchar_t string. 375 * 376 * This will then be converted back to a multibyte string to 377 * return to the caller. 378 */ 379 380 /* Allocate space for the wide char strings */ 381 psrc = pdst = extra = NULL; 382 if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL) 383 return -1; 384 if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL) 385 goto out; 386 dst = pdst; 387 src = psrc; 388 389 /* Use caller's multibyte conversion error flag. */ 390 if (cerr_ptr) 391 cerr = *cerr_ptr; 392 393 /* 394 * Input loop. 395 * Handle up to mblength characters (not bytes). We do not 396 * stop at NULs because we may be processing a block of data 397 * that includes NULs. 398 */ 399 mbslength = (ssize_t)mblength; 400 /* 401 * When inputing a single character, must also read in the 402 * next character for nextc, the look-ahead character. 403 */ 404 if (mbslength == 1) 405 mbslength++; 406 while (mbslength > 0) { 407 /* Convert one multibyte character to wchar_t. */ 408 if (!cerr) 409 clen = mbtowc(src, mbsrc, MB_LEN_MAX); 410 if (cerr || clen < 0) { 411 /* Conversion error, process as a byte instead. */ 412 *src = (wint_t)(u_char)*mbsrc; 413 clen = 1; 414 cerr = 1; 415 } 416 if (clen == 0) 417 /* 418 * NUL in input gives 0 return value. process 419 * as single NUL byte and keep going. 420 */ 421 clen = 1; 422 /* Advance buffer character pointer. */ 423 src++; 424 /* Advance input pointer by number of bytes read. */ 425 mbsrc += clen; 426 /* Decrement input byte count. */ 427 mbslength -= clen; 428 } 429 len = src - psrc; 430 src = psrc; 431 /* 432 * In the single character input case, we will have actually 433 * processed two characters, c and nextc. Reset len back to 434 * just a single character. 435 */ 436 if (mblength < len) 437 len = mblength; 438 439 /* Convert extra argument to list of characters for this mode. */ 440 extra = makeextralist(flags, mbextra); 441 if (!extra) { 442 if (dlen && *dlen == 0) { 443 errno = ENOSPC; 444 goto out; 445 } 446 *mbdst = '\0'; /* can't create extra, return "" */ 447 error = 0; 448 goto out; 449 } 450 451 /* Look up which processing function to call. */ 452 f = getvisfun(flags); 453 454 /* 455 * Main processing loop. 456 * Call do_Xvis processing function one character at a time 457 * with next character available for look-ahead. 458 */ 459 for (start = dst; len > 0; len--) { 460 c = *src++; 461 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra); 462 if (dst == NULL) { 463 errno = ENOSPC; 464 goto out; 465 } 466 } 467 468 /* Terminate the string in the buffer. */ 469 *dst = L'\0'; 470 471 /* 472 * Output loop. 473 * Convert wchar_t string back to multibyte output string. 474 * If we have hit a multi-byte conversion error on input, 475 * output byte-by-byte here. Else use wctomb(). 476 */ 477 len = wcslen(start); 478 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1); 479 olen = 0; 480 for (dst = start; len > 0; len--) { 481 if (!cerr) 482 clen = wctomb(mbdst, *dst); 483 if (cerr || clen < 0) { 484 /* 485 * Conversion error, process as a byte(s) instead. 486 * Examine each byte and higher-order bytes for 487 * data. E.g., 488 * 0x000000000000a264 -> a2 64 489 * 0x000000001f00a264 -> 1f 00 a2 64 490 */ 491 clen = 0; 492 wmsk = 0; 493 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 494 shft = i * NBBY; 495 bmsk = (uint64_t)0xffLL << shft; 496 wmsk |= bmsk; 497 if ((*dst & wmsk) || i == 0) 498 mbdst[clen++] = (char)( 499 (uint64_t)(*dst & bmsk) >> 500 shft); 501 } 502 cerr = 1; 503 } 504 /* If this character would exceed our output limit, stop. */ 505 if (olen + clen > (size_t)maxolen) 506 break; 507 /* Advance output pointer by number of bytes written. */ 508 mbdst += clen; 509 /* Advance buffer character pointer. */ 510 dst++; 511 /* Incrment output character count. */ 512 olen += clen; 513 } 514 515 /* Terminate the output string. */ 516 *mbdst = '\0'; 517 518 /* Pass conversion error flag out. */ 519 if (cerr_ptr) 520 *cerr_ptr = cerr; 521 522 free(extra); 523 free(pdst); 524 free(psrc); 525 526 return (int)olen; 527 out: 528 free(extra); 529 free(pdst); 530 free(psrc); 531 return error; 532 } 533 534 static int 535 istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc, 536 int flags, const char *mbextra, int *cerr_ptr) 537 { 538 return istrsenvisx(mbdst, dlen, mbsrc, 539 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr); 540 } 541 542 #endif 543 544 #if !HAVE_SVIS 545 /* 546 * The "svis" variants all take an "extra" arg that is a pointer 547 * to a NUL-terminated list of characters to be encoded, too. 548 * These functions are useful e. g. to encode strings in such a 549 * way so that they are not interpreted by a shell. 550 */ 551 552 char * 553 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra) 554 { 555 char cc[2]; 556 int ret; 557 558 cc[0] = c; 559 cc[1] = nextc; 560 561 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL); 562 if (ret < 0) 563 return NULL; 564 return mbdst + ret; 565 } 566 567 char * 568 snvis(char *mbdst, size_t dlen, 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, &dlen, cc, 1, flags, mbextra, NULL); 577 if (ret < 0) 578 return NULL; 579 return mbdst + ret; 580 } 581 582 int 583 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra) 584 { 585 return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL); 586 } 587 588 int 589 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra) 590 { 591 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL); 592 } 593 594 int 595 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra) 596 { 597 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL); 598 } 599 600 int 601 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 602 const char *mbextra) 603 { 604 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL); 605 } 606 607 int 608 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 609 const char *mbextra, int *cerr_ptr) 610 { 611 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr); 612 } 613 #endif 614 615 #if !HAVE_VIS 616 /* 617 * vis - visually encode characters 618 */ 619 char * 620 vis(char *mbdst, int c, int flags, int nextc) 621 { 622 char cc[2]; 623 int ret; 624 625 cc[0] = c; 626 cc[1] = nextc; 627 628 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL); 629 if (ret < 0) 630 return NULL; 631 return mbdst + ret; 632 } 633 634 char * 635 nvis(char *mbdst, size_t dlen, 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, &dlen, cc, 1, flags, "", NULL); 644 if (ret < 0) 645 return NULL; 646 return mbdst + ret; 647 } 648 649 /* 650 * strvis - visually encode characters from src into dst 651 * 652 * Dst must be 4 times the size of src to account for possible 653 * expansion. The length of dst, not including the trailing NULL, 654 * is returned. 655 */ 656 657 int 658 strvis(char *mbdst, const char *mbsrc, int flags) 659 { 660 return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL); 661 } 662 663 int 664 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags) 665 { 666 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL); 667 } 668 669 /* 670 * strvisx - visually encode characters from src into dst 671 * 672 * Dst must be 4 times the size of src to account for possible 673 * expansion. The length of dst, not including the trailing NULL, 674 * is returned. 675 * 676 * Strvisx encodes exactly len characters from src into dst. 677 * This is useful for encoding a block of data. 678 */ 679 680 int 681 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags) 682 { 683 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL); 684 } 685 686 int 687 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags) 688 { 689 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL); 690 } 691 692 int 693 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 694 int *cerr_ptr) 695 { 696 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr); 697 } 698 #endif 699
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