1 /* $NetBSD: vis.c,v 1.72 2017/02/12 22:37:49 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 1.72 2017/02/12 22:37:49 christos Exp $"); 61 #endif /* LIBC_SCCS and not lint */ 62 #ifdef __FBSDID 63 __FBSDID("$FreeBSD$"); 64 #define _DIAGASSERT(x) assert(x) 65 #endif 66 67 #include "namespace.h" 68 #include <sys/types.h> 69 #include <sys/param.h> 70 71 #include <assert.h> 72 #include <vis.h> 73 #include <errno.h> 74 #include <stdlib.h> 75 #include <wchar.h> 76 #include <wctype.h> 77 78 #ifdef __weak_alias 79 __weak_alias(strvisx,_strvisx) 80 #endif 81 82 #if !HAVE_VIS || !HAVE_SVIS 83 #include <ctype.h> 84 #include <limits.h> 85 #include <stdio.h> 86 #include <string.h> 87 88 /* 89 * The reason for going through the trouble to deal with character encodings 90 * in vis(3), is that we use this to safe encode output of commands. This 91 * safe encoding varies depending on the character set. For example if we 92 * display ps output in French, we don't want to display French characters 93 * as M-foo. 94 */ 95 96 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *); 97 98 #undef BELL 99 #define BELL L'\a' 100 101 #if defined(LC_C_LOCALE) 102 #define iscgraph(c) isgraph_l(c, LC_C_LOCALE) 103 #else 104 /* Keep it simple for now, no locale stuff */ 105 #define iscgraph(c) isgraph(c) 106 #ifdef notyet 107 #include <locale.h> 108 static int 109 iscgraph(int c) { 110 int rv; 111 char *ol; 112 113 ol = setlocale(LC_CTYPE, "C"); 114 rv = isgraph(c); 115 if (ol) 116 setlocale(LC_CTYPE, ol); 117 return rv; 118 } 119 #endif 120 #endif 121 122 #define ISGRAPH(flags, c) \ 123 (((flags) & VIS_NOLOCALE) ? iscgraph(c) : iswgraph(c)) 124 125 #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7') 126 #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n') 127 #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r') 128 #define xtoa(c) L"0123456789abcdef"[c] 129 #define XTOA(c) L"0123456789ABCDEF"[c] 130 131 #define MAXEXTRAS 30 132 133 static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~"; 134 static const wchar_t char_glob[] = L"*?[#"; 135 136 #if !HAVE_NBTOOL_CONFIG_H 137 #ifndef __NetBSD__ 138 /* 139 * On NetBSD MB_LEN_MAX is currently 32 which does not fit on any integer 140 * integral type and it is probably wrong, since currently the maximum 141 * number of bytes and character needs is 6. Until this is fixed, the 142 * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and 143 * the assertion is commented out. 144 */ 145 #ifdef __FreeBSD__ 146 /* 147 * On FreeBSD including <sys/systm.h> for CTASSERT only works in kernel 148 * mode. 149 */ 150 #ifndef CTASSERT 151 #define CTASSERT(x) _CTASSERT(x, __LINE__) 152 #define _CTASSERT(x, y) __CTASSERT(x, y) 153 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 154 #endif 155 #endif /* __FreeBSD__ */ 156 CTASSERT(MB_LEN_MAX <= sizeof(uint64_t)); 157 #endif /* !__NetBSD__ */ 158 #endif 159 160 /* 161 * This is do_hvis, for HTTP style (RFC 1808) 162 */ 163 static wchar_t * 164 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 165 { 166 if (iswalnum(c) 167 /* safe */ 168 || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+' 169 /* extra */ 170 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')' 171 || c == L',') 172 dst = do_svis(dst, c, flags, nextc, extra); 173 else { 174 *dst++ = L'%'; 175 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf); 176 *dst++ = xtoa((unsigned int)c & 0xf); 177 } 178 179 return dst; 180 } 181 182 /* 183 * This is do_mvis, for Quoted-Printable MIME (RFC 2045) 184 * NB: No handling of long lines or CRLF. 185 */ 186 static wchar_t * 187 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 188 { 189 if ((c != L'\n') && 190 /* Space at the end of the line */ 191 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) || 192 /* Out of range */ 193 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) || 194 /* Specific char to be escaped */ 195 wcschr(L"#$@[\\]^`{|}~", c) != NULL)) { 196 *dst++ = L'='; 197 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf); 198 *dst++ = XTOA((unsigned int)c & 0xf); 199 } else 200 dst = do_svis(dst, c, flags, nextc, extra); 201 return dst; 202 } 203 204 /* 205 * Output single byte of multibyte character. 206 */ 207 static wchar_t * 208 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra) 209 { 210 if (flags & VIS_CSTYLE) { 211 switch (c) { 212 case L'\n': 213 *dst++ = L'\\'; *dst++ = L'n'; 214 return dst; 215 case L'\r': 216 *dst++ = L'\\'; *dst++ = L'r'; 217 return dst; 218 case L'\b': 219 *dst++ = L'\\'; *dst++ = L'b'; 220 return dst; 221 case BELL: 222 *dst++ = L'\\'; *dst++ = L'a'; 223 return dst; 224 case L'\v': 225 *dst++ = L'\\'; *dst++ = L'v'; 226 return dst; 227 case L'\t': 228 *dst++ = L'\\'; *dst++ = L't'; 229 return dst; 230 case L'\f': 231 *dst++ = L'\\'; *dst++ = L'f'; 232 return dst; 233 case L' ': 234 *dst++ = L'\\'; *dst++ = L's'; 235 return dst; 236 case L'\0': 237 *dst++ = L'\\'; *dst++ = L'0'; 238 if (iswoctal(nextc)) { 239 *dst++ = L'0'; 240 *dst++ = L'0'; 241 } 242 return dst; 243 /* We cannot encode these characters in VIS_CSTYLE 244 * because they special meaning */ 245 case L'n': 246 case L'r': 247 case L'b': 248 case L'a': 249 case L'v': 250 case L't': 251 case L'f': 252 case L's': 253 case L'0': 254 case L'M': 255 case L'^': 256 case L'$': /* vis(1) -l */ 257 break; 258 default: 259 if (ISGRAPH(flags, c) && !iswoctal(c)) { 260 *dst++ = L'\\'; 261 *dst++ = c; 262 return dst; 263 } 264 } 265 } 266 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) { 267 *dst++ = L'\\'; 268 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0'; 269 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0'; 270 *dst++ = (c & 07) + L'0'; 271 } else { 272 if ((flags & VIS_NOSLASH) == 0) 273 *dst++ = L'\\'; 274 275 if (c & 0200) { 276 c &= 0177; 277 *dst++ = L'M'; 278 } 279 280 if (iswcntrl(c)) { 281 *dst++ = L'^'; 282 if (c == 0177) 283 *dst++ = L'?'; 284 else 285 *dst++ = c + L'@'; 286 } else { 287 *dst++ = L'-'; 288 *dst++ = c; 289 } 290 } 291 292 return dst; 293 } 294 295 /* 296 * This is do_vis, the central code of vis. 297 * dst: Pointer to the destination buffer 298 * c: Character to encode 299 * flags: Flags word 300 * nextc: The character following 'c' 301 * extra: Pointer to the list of extra characters to be 302 * backslash-protected. 303 */ 304 static wchar_t * 305 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra) 306 { 307 int iswextra, i, shft; 308 uint64_t bmsk, wmsk; 309 310 iswextra = wcschr(extra, c) != NULL; 311 if (!iswextra && (ISGRAPH(flags, c) || iswwhite(c) || 312 ((flags & VIS_SAFE) && iswsafe(c)))) { 313 *dst++ = c; 314 return dst; 315 } 316 317 /* See comment in istrsenvisx() output loop, below. */ 318 wmsk = 0; 319 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 320 shft = i * NBBY; 321 bmsk = (uint64_t)0xffLL << shft; 322 wmsk |= bmsk; 323 if ((c & wmsk) || i == 0) 324 dst = do_mbyte(dst, (wint_t)( 325 (uint64_t)(c & bmsk) >> shft), 326 flags, nextc, iswextra); 327 } 328 329 return dst; 330 } 331 332 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *); 333 334 /* 335 * Return the appropriate encoding function depending on the flags given. 336 */ 337 static visfun_t 338 getvisfun(int flags) 339 { 340 if (flags & VIS_HTTPSTYLE) 341 return do_hvis; 342 if (flags & VIS_MIMESTYLE) 343 return do_mvis; 344 return do_svis; 345 } 346 347 /* 348 * Expand list of extra characters to not visually encode. 349 */ 350 static wchar_t * 351 makeextralist(int flags, const char *src) 352 { 353 wchar_t *dst, *d; 354 size_t len; 355 const wchar_t *s; 356 357 len = strlen(src); 358 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL) 359 return NULL; 360 361 if ((flags & VIS_NOLOCALE) || mbstowcs(dst, src, len) == (size_t)-1) { 362 size_t i; 363 for (i = 0; i < len; i++) 364 dst[i] = (wchar_t)(u_char)src[i]; 365 d = dst + len; 366 } else 367 d = dst + wcslen(dst); 368 369 if (flags & VIS_GLOB) 370 for (s = char_glob; *s; *d++ = *s++) 371 continue; 372 373 if (flags & VIS_SHELL) 374 for (s = char_shell; *s; *d++ = *s++) 375 continue; 376 377 if (flags & VIS_SP) *d++ = L' '; 378 if (flags & VIS_TAB) *d++ = L'\t'; 379 if (flags & VIS_NL) *d++ = L'\n'; 380 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\'; 381 *d = L'\0'; 382 383 return dst; 384 } 385 386 /* 387 * istrsenvisx() 388 * The main internal function. 389 * All user-visible functions call this one. 390 */ 391 static int 392 istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength, 393 int flags, const char *mbextra, int *cerr_ptr) 394 { 395 wchar_t *dst, *src, *pdst, *psrc, *start, *extra; 396 size_t len, olen; 397 uint64_t bmsk, wmsk; 398 wint_t c; 399 visfun_t f; 400 int clen = 0, cerr, error = -1, i, shft; 401 char *mbdst, *mdst; 402 ssize_t mbslength, maxolen; 403 404 _DIAGASSERT(mbdstp != NULL); 405 _DIAGASSERT(mbsrc != NULL || mblength == 0); 406 _DIAGASSERT(mbextra != NULL); 407 408 mbslength = (ssize_t)mblength; 409 /* 410 * When inputing a single character, must also read in the 411 * next character for nextc, the look-ahead character. 412 */ 413 if (mbslength == 1) 414 mbslength++; 415 416 /* 417 * Input (mbsrc) is a char string considered to be multibyte 418 * characters. The input loop will read this string pulling 419 * one character, possibly multiple bytes, from mbsrc and 420 * converting each to wchar_t in src. 421 * 422 * The vis conversion will be done using the wide char 423 * wchar_t string. 424 * 425 * This will then be converted back to a multibyte string to 426 * return to the caller. 427 */ 428 429 /* Allocate space for the wide char strings */ 430 psrc = pdst = extra = NULL; 431 mdst = NULL; 432 if ((psrc = calloc(mbslength + 1, sizeof(*psrc))) == NULL) 433 return -1; 434 if ((pdst = calloc((4 * mbslength) + 1, sizeof(*pdst))) == NULL) 435 goto out; 436 if (*mbdstp == NULL) { 437 if ((mdst = calloc((4 * mbslength) + 1, sizeof(*mdst))) == NULL) 438 goto out; 439 *mbdstp = mdst; 440 } 441 442 mbdst = *mbdstp; 443 dst = pdst; 444 src = psrc; 445 446 if (flags & VIS_NOLOCALE) { 447 /* Do one byte at a time conversion */ 448 cerr = 1; 449 } else { 450 /* Use caller's multibyte conversion error flag. */ 451 cerr = cerr_ptr ? *cerr_ptr : 0; 452 } 453 454 /* 455 * Input loop. 456 * Handle up to mblength characters (not bytes). We do not 457 * stop at NULs because we may be processing a block of data 458 * that includes NULs. 459 */ 460 while (mbslength > 0) { 461 /* Convert one multibyte character to wchar_t. */ 462 if (!cerr) 463 clen = mbtowc(src, mbsrc, MB_LEN_MAX); 464 if (cerr || clen < 0) { 465 /* Conversion error, process as a byte instead. */ 466 *src = (wint_t)(u_char)*mbsrc; 467 clen = 1; 468 cerr = 1; 469 } 470 if (clen == 0) 471 /* 472 * NUL in input gives 0 return value. process 473 * as single NUL byte and keep going. 474 */ 475 clen = 1; 476 /* Advance buffer character pointer. */ 477 src++; 478 /* Advance input pointer by number of bytes read. */ 479 mbsrc += clen; 480 /* Decrement input byte count. */ 481 mbslength -= clen; 482 } 483 len = src - psrc; 484 src = psrc; 485 486 /* 487 * In the single character input case, we will have actually 488 * processed two characters, c and nextc. Reset len back to 489 * just a single character. 490 */ 491 if (mblength < len) 492 len = mblength; 493 494 /* Convert extra argument to list of characters for this mode. */ 495 extra = makeextralist(flags, mbextra); 496 if (!extra) { 497 if (dlen && *dlen == 0) { 498 errno = ENOSPC; 499 goto out; 500 } 501 *mbdst = '\0'; /* can't create extra, return "" */ 502 error = 0; 503 goto out; 504 } 505 506 /* Look up which processing function to call. */ 507 f = getvisfun(flags); 508 509 /* 510 * Main processing loop. 511 * Call do_Xvis processing function one character at a time 512 * with next character available for look-ahead. 513 */ 514 for (start = dst; len > 0; len--) { 515 c = *src++; 516 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra); 517 if (dst == NULL) { 518 errno = ENOSPC; 519 goto out; 520 } 521 } 522 523 /* Terminate the string in the buffer. */ 524 *dst = L'\0'; 525 526 /* 527 * Output loop. 528 * Convert wchar_t string back to multibyte output string. 529 * If we have hit a multi-byte conversion error on input, 530 * output byte-by-byte here. Else use wctomb(). 531 */ 532 len = wcslen(start); 533 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1); 534 olen = 0; 535 for (dst = start; len > 0; len--) { 536 if (!cerr) 537 clen = wctomb(mbdst, *dst); 538 if (cerr || clen < 0) { 539 /* 540 * Conversion error, process as a byte(s) instead. 541 * Examine each byte and higher-order bytes for 542 * data. E.g., 543 * 0x000000000000a264 -> a2 64 544 * 0x000000001f00a264 -> 1f 00 a2 64 545 */ 546 clen = 0; 547 wmsk = 0; 548 for (i = sizeof(wmsk) - 1; i >= 0; i--) { 549 shft = i * NBBY; 550 bmsk = (uint64_t)0xffLL << shft; 551 wmsk |= bmsk; 552 if ((*dst & wmsk) || i == 0) 553 mbdst[clen++] = (char)( 554 (uint64_t)(*dst & bmsk) >> 555 shft); 556 } 557 cerr = 1; 558 } 559 /* If this character would exceed our output limit, stop. */ 560 if (olen + clen > (size_t)maxolen) 561 break; 562 /* Advance output pointer by number of bytes written. */ 563 mbdst += clen; 564 /* Advance buffer character pointer. */ 565 dst++; 566 /* Incrment output character count. */ 567 olen += clen; 568 } 569 570 /* Terminate the output string. */ 571 *mbdst = '\0'; 572 573 if (flags & VIS_NOLOCALE) { 574 /* Pass conversion error flag out. */ 575 if (cerr_ptr) 576 *cerr_ptr = cerr; 577 } 578 579 free(extra); 580 free(pdst); 581 free(psrc); 582 583 return (int)olen; 584 out: 585 free(extra); 586 free(pdst); 587 free(psrc); 588 free(mdst); 589 return error; 590 } 591 592 static int 593 istrsenvisxl(char **mbdstp, size_t *dlen, const char *mbsrc, 594 int flags, const char *mbextra, int *cerr_ptr) 595 { 596 return istrsenvisx(mbdstp, dlen, mbsrc, 597 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr); 598 } 599 600 #endif 601 602 #if !HAVE_SVIS 603 /* 604 * The "svis" variants all take an "extra" arg that is a pointer 605 * to a NUL-terminated list of characters to be encoded, too. 606 * These functions are useful e. g. to encode strings in such a 607 * way so that they are not interpreted by a shell. 608 */ 609 610 char * 611 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra) 612 { 613 char cc[2]; 614 int ret; 615 616 cc[0] = c; 617 cc[1] = nextc; 618 619 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, mbextra, NULL); 620 if (ret < 0) 621 return NULL; 622 return mbdst + ret; 623 } 624 625 char * 626 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra) 627 { 628 char cc[2]; 629 int ret; 630 631 cc[0] = c; 632 cc[1] = nextc; 633 634 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, mbextra, NULL); 635 if (ret < 0) 636 return NULL; 637 return mbdst + ret; 638 } 639 640 int 641 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra) 642 { 643 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, mbextra, NULL); 644 } 645 646 int 647 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra) 648 { 649 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, mbextra, NULL); 650 } 651 652 int 653 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra) 654 { 655 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, mbextra, NULL); 656 } 657 658 int 659 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 660 const char *mbextra) 661 { 662 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, NULL); 663 } 664 665 int 666 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 667 const char *mbextra, int *cerr_ptr) 668 { 669 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr); 670 } 671 #endif 672 673 #if !HAVE_VIS 674 /* 675 * vis - visually encode characters 676 */ 677 char * 678 vis(char *mbdst, int c, int flags, int nextc) 679 { 680 char cc[2]; 681 int ret; 682 683 cc[0] = c; 684 cc[1] = nextc; 685 686 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, "", NULL); 687 if (ret < 0) 688 return NULL; 689 return mbdst + ret; 690 } 691 692 char * 693 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc) 694 { 695 char cc[2]; 696 int ret; 697 698 cc[0] = c; 699 cc[1] = nextc; 700 701 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, "", NULL); 702 if (ret < 0) 703 return NULL; 704 return mbdst + ret; 705 } 706 707 /* 708 * strvis - visually encode characters from src into dst 709 * 710 * Dst must be 4 times the size of src to account for possible 711 * expansion. The length of dst, not including the trailing NULL, 712 * is returned. 713 */ 714 715 int 716 strvis(char *mbdst, const char *mbsrc, int flags) 717 { 718 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, "", NULL); 719 } 720 721 int 722 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags) 723 { 724 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, "", NULL); 725 } 726 727 int 728 stravis(char **mbdstp, const char *mbsrc, int flags) 729 { 730 *mbdstp = NULL; 731 return istrsenvisxl(mbdstp, NULL, mbsrc, flags, "", NULL); 732 } 733 734 /* 735 * strvisx - visually encode characters from src into dst 736 * 737 * Dst must be 4 times the size of src to account for possible 738 * expansion. The length of dst, not including the trailing NULL, 739 * is returned. 740 * 741 * Strvisx encodes exactly len characters from src into dst. 742 * This is useful for encoding a block of data. 743 */ 744 745 int 746 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags) 747 { 748 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, "", NULL); 749 } 750 751 int 752 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags) 753 { 754 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", NULL); 755 } 756 757 int 758 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags, 759 int *cerr_ptr) 760 { 761 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr); 762 } 763 #endif 764