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'x': 245 case L'0': 246 case L'E': 247 case L'F': 248 case L'M': 249 case L'-': 250 case L'^': 251 case L'$': /* vis(1) -l */ 252 break; 253 default: 254 if (ISGRAPH(flags, c) && !iswoctal(c)) { 255 *dst++ = L'\\'; 256 *dst++ = c; 257 return dst; 258 } 259 } 260 } 261 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) { 262 *dst++ = L'\\'; 263 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0'; 264 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0'; 265 *dst++ = (c & 07) + L'0'; 266 } else { 267 if ((flags & VIS_NOSLASH) == 0) 268 *dst++ = L'\\'; 269 270 if (c & 0200) { 271 c &= 0177; 272 *dst++ = L'M'; 273 } 274 275 if (iswcntrl(c)) { 276 *dst++ = L'^'; 277 if (c == 0177) 278 *dst++ = L'?'; 279 else 280 *dst++ = c + L'@'; 281 } else { 282 *dst++ = L'-'; 283 *dst++ = c; 284 } 285 } 286 287 return dst; 288 } 289 290 /* 291 * This is do_vis, the central code of vis. 292 * dst: Pointer to the destination buffer 293 * c: Character to encode 294 * flags: Flags word 295 * nextc: The character following 'c' 296 * extra: Pointer to the list of extra characters to be 297 * backslash-protected. 298 */ 299 static wchar_t * 300 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 301 { 302 int iswextra, i, shft; 303 uint64_t bmsk, wmsk; 304 305 iswextra = wcschr(extra, c) != NULL; 306 if (((flags & VIS_ALL) == 0) && 307 !iswextra && 308 (ISGRAPH(flags, c) || iswwhite(c) || 309 ((flags & VIS_SAFE) && iswsafe(c)))) { 310 *dst++ = c; 311 return dst; 312 } 313 314 /* See comment in istrsenvisx() output loop, below. */ 315 wmsk = 0; 316 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 317 shft = i * NBBY; 318 bmsk = (uint64_t)0xffLL << shft; 319 wmsk |= bmsk; 320 if ((c & wmsk) || i == 0) 321 dst = do_mbyte(dst, (wint_t)( 322 (uint64_t)(c & bmsk) >> shft), 323 flags, nextc, iswextra); 324 } 325 326 return dst; 327 } 328 329 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *); 330 331 /* 332 * Return the appropriate encoding function depending on the flags given. 333 */ 334 static visfun_t 335 getvisfun(int flags) 336 { 337 if (flags & VIS_HTTPSTYLE) 338 return do_hvis; 339 if (flags & VIS_MIMESTYLE) 340 return do_mvis; 341 return do_svis; 342 } 343 344 /* 345 * Expand list of extra characters to not visually encode. 346 */ 347 static wchar_t * 348 makeextralist(int flags, const char *src) 349 { 350 wchar_t *dst, *d; 351 size_t len; 352 const wchar_t *s; 353 354 len = strlen(src); 355 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL) 356 return NULL; 357 358 if ((flags & VIS_NOLOCALE) || mbstowcs(dst, src, len) == (size_t)-1) { 359 size_t i; 360 for (i = 0; i < len; i++) 361 dst[i] = (wchar_t)(u_char)src[i]; 362 d = dst + len; 363 } else 364 d = dst + wcslen(dst); 365 366 if (flags & VIS_GLOB) 367 for (s = char_glob; *s; *d++ = *s++) 368 continue; 369 370 if (flags & VIS_SHELL) 371 for (s = char_shell; *s; *d++ = *s++) 372 continue; 373 374 if (flags & VIS_SP) *d++ = L' '; 375 if (flags & VIS_TAB) *d++ = L'\t'; 376 if (flags & VIS_NL) *d++ = L'\n'; 377 if (flags & VIS_DQ) *d++ = L'"'; 378 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\'; 379 *d = L'\0'; 380 381 return dst; 382 } 383 384 /* 385 * istrsenvisx() 386 * The main internal function. 387 * All user-visible functions call this one. 388 */ 389 static int 390 istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength, 391 int flags, const char *mbextra, int *cerr_ptr) 392 { 393 wchar_t *dst, *src, *pdst, *psrc, *start, *extra; 394 size_t len, olen; 395 uint64_t bmsk, wmsk; 396 wint_t c; 397 visfun_t f; 398 int clen = 0, cerr, error = -1, i, shft; 399 char *mbdst, *mdst; 400 ssize_t mbslength, maxolen; 401 402 _DIAGASSERT(mbdstp != NULL); 403 _DIAGASSERT(mbsrc != NULL || mblength == 0); 404 _DIAGASSERT(mbextra != NULL); 405 406 mbslength = (ssize_t)mblength; 407 /* 408 * When inputing a single character, must also read in the 409 * next character for nextc, the look-ahead character. 410 */ 411 if (mbslength == 1) 412 mbslength++; 413 414 /* 415 * Input (mbsrc) is a char string considered to be multibyte 416 * characters. The input loop will read this string pulling 417 * one character, possibly multiple bytes, from mbsrc and 418 * converting each to wchar_t in src. 419 * 420 * The vis conversion will be done using the wide char 421 * wchar_t string. 422 * 423 * This will then be converted back to a multibyte string to 424 * return to the caller. 425 */ 426 427 /* Allocate space for the wide char strings */ 428 psrc = pdst = extra = NULL; 429 mdst = NULL; 430 if ((psrc = calloc(mbslength + 1, sizeof(*psrc))) == NULL) 431 return -1; 432 if ((pdst = calloc((16 * mbslength) + 1, sizeof(*pdst))) == NULL) 433 goto out; 434 if (*mbdstp == NULL) { 435 if ((mdst = calloc((16 * mbslength) + 1, sizeof(*mdst))) == NULL) 436 goto out; 437 *mbdstp = mdst; 438 } 439 440 mbdst = *mbdstp; 441 dst = pdst; 442 src = psrc; 443 444 if (flags & VIS_NOLOCALE) { 445 /* Do one byte at a time conversion */ 446 cerr = 1; 447 } else { 448 /* Use caller's multibyte conversion error flag. */ 449 cerr = cerr_ptr ? *cerr_ptr : 0; 450 } 451 452 /* 453 * Input loop. 454 * Handle up to mblength characters (not bytes). We do not 455 * stop at NULs because we may be processing a block of data 456 * that includes NULs. 457 */ 458 while (mbslength > 0) { 459 /* Convert one multibyte character to wchar_t. */ 460 if (!cerr) 461 clen = mbtowc(src, mbsrc, MB_LEN_MAX); 462 if (cerr || clen < 0) { 463 /* Conversion error, process as a byte instead. */ 464 *src = (wint_t)(u_char)*mbsrc; 465 clen = 1; 466 cerr = 1; 467 } 468 if (clen == 0) { 469 /* 470 * NUL in input gives 0 return value. process 471 * as single NUL byte and keep going. 472 */ 473 clen = 1; 474 } 475 /* Advance buffer character pointer. */ 476 src++; 477 /* Advance input pointer by number of bytes read. */ 478 mbsrc += clen; 479 /* Decrement input byte count. */ 480 mbslength -= clen; 481 } 482 len = src - psrc; 483 src = psrc; 484 485 /* 486 * In the single character input case, we will have actually 487 * processed two characters, c and nextc. Reset len back to 488 * just a single character. 489 */ 490 if (mblength < len) 491 len = mblength; 492 493 /* Convert extra argument to list of characters for this mode. */ 494 extra = makeextralist(flags, mbextra); 495 if (!extra) { 496 if (dlen && *dlen == 0) { 497 errno = ENOSPC; 498 goto out; 499 } 500 *mbdst = '\0'; /* can't create extra, return "" */ 501 error = 0; 502 goto out; 503 } 504 505 /* Look up which processing function to call. */ 506 f = getvisfun(flags); 507 508 /* 509 * Main processing loop. 510 * Call do_Xvis processing function one character at a time 511 * with next character available for look-ahead. 512 */ 513 for (start = dst; len > 0; len--) { 514 c = *src++; 515 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra); 516 if (dst == NULL) { 517 errno = ENOSPC; 518 goto out; 519 } 520 } 521 522 /* Terminate the string in the buffer. */ 523 *dst = L'\0'; 524 525 /* 526 * Output loop. 527 * Convert wchar_t string back to multibyte output string. 528 * If we have hit a multi-byte conversion error on input, 529 * output byte-by-byte here. Else use wctomb(). 530 */ 531 len = wcslen(start); 532 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1); 533 olen = 0; 534 for (dst = start; len > 0; len--) { 535 if (!cerr) 536 clen = wctomb(mbdst, *dst); 537 if (cerr || clen < 0) { 538 /* 539 * Conversion error, process as a byte(s) instead. 540 * Examine each byte and higher-order bytes for 541 * data. E.g., 542 * 0x000000000000a264 -> a2 64 543 * 0x000000001f00a264 -> 1f 00 a2 64 544 */ 545 clen = 0; 546 wmsk = 0; 547 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 548 shft = i * NBBY; 549 bmsk = (uint64_t)0xffLL << shft; 550 wmsk |= bmsk; 551 if ((*dst & wmsk) || i == 0) 552 mbdst[clen++] = (char)( 553 (uint64_t)(*dst & bmsk) >> 554 shft); 555 } 556 cerr = 1; 557 } 558 /* If this character would exceed our output limit, stop. */ 559 if (olen + clen > (size_t)maxolen) 560 break; 561 /* Advance output pointer by number of bytes written. */ 562 mbdst += clen; 563 /* Advance buffer character pointer. */ 564 dst++; 565 /* Incrment output character count. */ 566 olen += clen; 567 } 568 569 /* Terminate the output string. */ 570 *mbdst = '\0'; 571 572 if (flags & VIS_NOLOCALE) { 573 /* Pass conversion error flag out. */ 574 if (cerr_ptr) 575 *cerr_ptr = cerr; 576 } 577 578 free(extra); 579 free(pdst); 580 free(psrc); 581 582 return (int)olen; 583 out: 584 free(extra); 585 free(pdst); 586 free(psrc); 587 free(mdst); 588 return error; 589 } 590 591 static int 592 istrsenvisxl(char **mbdstp, size_t *dlen, const char *mbsrc, 593 int flags, const char *mbextra, int *cerr_ptr) 594 { 595 return istrsenvisx(mbdstp, dlen, mbsrc, 596 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr); 597 } 598 599 #endif 600 601 #if !HAVE_SVIS 602 /* 603 * The "svis" variants all take an "extra" arg that is a pointer 604 * to a NUL-terminated list of characters to be encoded, too. 605 * These functions are useful e. g. to encode strings in such a 606 * way so that they are not interpreted by a shell. 607 */ 608 609 char * 610 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra) 611 { 612 char cc[2]; 613 int ret; 614 615 cc[0] = c; 616 cc[1] = nextc; 617 618 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, mbextra, NULL); 619 if (ret < 0) 620 return NULL; 621 return mbdst + ret; 622 } 623 624 char * 625 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra) 626 { 627 char cc[2]; 628 int ret; 629 630 cc[0] = c; 631 cc[1] = nextc; 632 633 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, mbextra, NULL); 634 if (ret < 0) 635 return NULL; 636 return mbdst + ret; 637 } 638 639 int 640 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra) 641 { 642 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, mbextra, NULL); 643 } 644 645 int 646 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra) 647 { 648 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, mbextra, NULL); 649 } 650 651 int 652 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra) 653 { 654 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, mbextra, NULL); 655 } 656 657 int 658 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 659 const char *mbextra) 660 { 661 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, NULL); 662 } 663 664 int 665 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 666 const char *mbextra, int *cerr_ptr) 667 { 668 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr); 669 } 670 #endif 671 672 #if !HAVE_VIS 673 /* 674 * vis - visually encode characters 675 */ 676 char * 677 vis(char *mbdst, int c, int flags, int nextc) 678 { 679 char cc[2]; 680 int ret; 681 682 cc[0] = c; 683 cc[1] = nextc; 684 685 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, "", NULL); 686 if (ret < 0) 687 return NULL; 688 return mbdst + ret; 689 } 690 691 char * 692 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc) 693 { 694 char cc[2]; 695 int ret; 696 697 cc[0] = c; 698 cc[1] = nextc; 699 700 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, "", NULL); 701 if (ret < 0) 702 return NULL; 703 return mbdst + ret; 704 } 705 706 /* 707 * strvis - visually encode characters from src into dst 708 * 709 * Dst must be 4 times the size of src to account for possible 710 * expansion. The length of dst, not including the trailing NULL, 711 * is returned. 712 */ 713 714 int 715 strvis(char *mbdst, const char *mbsrc, int flags) 716 { 717 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, "", NULL); 718 } 719 720 int 721 strnvis(char *dst, const char *src, size_t len, int flag) 722 { 723 return istrsenvisxl(&dst, &len, src, flag, "", NULL); 724 } 725 726 int 727 stravis(char **mbdstp, const char *mbsrc, int flags) 728 { 729 *mbdstp = NULL; 730 return istrsenvisxl(mbdstp, NULL, mbsrc, flags, "", NULL); 731 } 732 733 /* 734 * strvisx - visually encode characters from src into dst 735 * 736 * Dst must be 4 times the size of src to account for possible 737 * expansion. The length of dst, not including the trailing NULL, 738 * is returned. 739 * 740 * Strvisx encodes exactly len characters from src into dst. 741 * This is useful for encoding a block of data. 742 */ 743 744 int 745 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags) 746 { 747 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, "", NULL); 748 } 749 750 int 751 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags) 752 { 753 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", NULL); 754 } 755 756 int 757 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 758 int *cerr_ptr) 759 { 760 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr); 761 } 762 #endif 763