1 /* $NetBSD: vis.c,v 1.70 2015/05/26 21:42:46 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 1.70 2015/05/26 21:42:46 christos Exp $");
61 #endif /* LIBC_SCCS and not lint */
62 #ifdef __FBSDID
63 __FBSDID("$FreeBSD$");
64 #define _DIAGASSERT(x) assert(x)
65 #endif
66
67 #include "namespace.h"
68 #include <sys/types.h>
69 #include <sys/param.h>
70
71 #include <assert.h>
72 #include <vis.h>
73 #include <errno.h>
74 #include <stdlib.h>
75 #include <wchar.h>
76 #include <wctype.h>
77
78 #ifdef __weak_alias
79 __weak_alias(strvisx,_strvisx)
80 #endif
81
82 #if !HAVE_VIS || !HAVE_SVIS
83 #include <ctype.h>
84 #include <limits.h>
85 #include <stdio.h>
86 #include <string.h>
87
88 /*
89 * The reason for going through the trouble to deal with character encodings
90 * in vis(3), is that we use this to safe encode output of commands. This
91 * safe encoding varies depending on the character set. For example if we
92 * display ps output in French, we don't want to display French characters
93 * as M-foo.
94 */
95
96 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
97
98 #undef BELL
99 #define BELL L'\a'
100
101 #if defined(LC_C_LOCALE)
102 #define iscgraph(c) isgraph_l(c, LC_C_LOCALE)
103 #else
104 /* Keep it simple for now, no locale stuff */
105 #define iscgraph(c) isgraph(c)
106 #ifdef notyet
107 #include <locale.h>
108 static int
iscgraph(int c)109 iscgraph(int c) {
110 int rv;
111 char *ol;
112
113 ol = setlocale(LC_CTYPE, "C");
114 rv = isgraph(c);
115 if (ol)
116 setlocale(LC_CTYPE, ol);
117 return rv;
118 }
119 #endif
120 #endif
121
122 #define ISGRAPH(flags, c) \
123 (((flags) & VIS_NOLOCALE) ? iscgraph(c) : iswgraph(c))
124
125 #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
126 #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n')
127 #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r')
128 #define xtoa(c) L"0123456789abcdef"[c]
129 #define XTOA(c) L"0123456789ABCDEF"[c]
130
131 #define MAXEXTRAS 30
132
133 static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~";
134 static const wchar_t char_glob[] = L"*?[#";
135
136 #if !HAVE_NBTOOL_CONFIG_H
137 #if !defined(__NetBSD__) && ! defined(__minix)
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 *
do_hvis(wchar_t * dst,wint_t c,int flags,wint_t nextc,const wchar_t * extra)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'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
169 /* extra */
170 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
171 || c == L',')
172 dst = do_svis(dst, c, flags, nextc, extra);
173 else {
174 *dst++ = L'%';
175 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
176 *dst++ = xtoa((unsigned int)c & 0xf);
177 }
178
179 return dst;
180 }
181
182 /*
183 * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
184 * NB: No handling of long lines or CRLF.
185 */
186 static wchar_t *
do_mvis(wchar_t * dst,wint_t c,int flags,wint_t nextc,const wchar_t * extra)187 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
188 {
189 if ((c != L'\n') &&
190 /* Space at the end of the line */
191 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
192 /* Out of range */
193 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
194 /* Specific char to be escaped */
195 wcschr(L"#$@[\\]^`{|}~", 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 *
do_mbyte(wchar_t * dst,wint_t c,int flags,wint_t nextc,int iswextra)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 *
do_svis(wchar_t * dst,wint_t c,int flags,wint_t nextc,const wchar_t * extra)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
getvisfun(int flags)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 *
makeextralist(int flags,const char * src)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
istrsenvisx(char * mbdst,size_t * dlen,const char * mbsrc,size_t mblength,int flags,const char * mbextra,int * cerr_ptr)392 istrsenvisx(char *mbdst, 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 ssize_t mbslength, maxolen;
402
403 _DIAGASSERT(mbdst != NULL);
404 _DIAGASSERT(mbsrc != NULL || mblength == 0);
405 _DIAGASSERT(mbextra != NULL);
406
407 /*
408 * Input (mbsrc) is a char string considered to be multibyte
409 * characters. The input loop will read this string pulling
410 * one character, possibly multiple bytes, from mbsrc and
411 * converting each to wchar_t in src.
412 *
413 * The vis conversion will be done using the wide char
414 * wchar_t string.
415 *
416 * This will then be converted back to a multibyte string to
417 * return to the caller.
418 */
419
420 /* Allocate space for the wide char strings */
421 psrc = pdst = extra = NULL;
422 if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL)
423 return -1;
424 if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL)
425 goto out;
426 dst = pdst;
427 src = psrc;
428
429 if (flags & VIS_NOLOCALE) {
430 /* Do one byte at a time conversion */
431 cerr = 1;
432 } else {
433 /* Use caller's multibyte conversion error flag. */
434 cerr = cerr_ptr ? *cerr_ptr : 0;
435 }
436
437 /*
438 * Input loop.
439 * Handle up to mblength characters (not bytes). We do not
440 * stop at NULs because we may be processing a block of data
441 * that includes NULs.
442 */
443 mbslength = (ssize_t)mblength;
444 /*
445 * When inputing a single character, must also read in the
446 * next character for nextc, the look-ahead character.
447 */
448 if (mbslength == 1)
449 mbslength++;
450 while (mbslength > 0) {
451 /* Convert one multibyte character to wchar_t. */
452 if (!cerr)
453 clen = mbtowc(src, mbsrc, MB_LEN_MAX);
454 if (cerr || clen < 0) {
455 /* Conversion error, process as a byte instead. */
456 *src = (wint_t)(u_char)*mbsrc;
457 clen = 1;
458 cerr = 1;
459 }
460 if (clen == 0)
461 /*
462 * NUL in input gives 0 return value. process
463 * as single NUL byte and keep going.
464 */
465 clen = 1;
466 /* Advance buffer character pointer. */
467 src++;
468 /* Advance input pointer by number of bytes read. */
469 mbsrc += clen;
470 /* Decrement input byte count. */
471 mbslength -= clen;
472 }
473 len = src - psrc;
474 src = psrc;
475 /*
476 * In the single character input case, we will have actually
477 * processed two characters, c and nextc. Reset len back to
478 * just a single character.
479 */
480 if (mblength < len)
481 len = mblength;
482
483 /* Convert extra argument to list of characters for this mode. */
484 extra = makeextralist(flags, mbextra);
485 if (!extra) {
486 if (dlen && *dlen == 0) {
487 errno = ENOSPC;
488 goto out;
489 }
490 *mbdst = '\0'; /* can't create extra, return "" */
491 error = 0;
492 goto out;
493 }
494
495 /* Look up which processing function to call. */
496 f = getvisfun(flags);
497
498 /*
499 * Main processing loop.
500 * Call do_Xvis processing function one character at a time
501 * with next character available for look-ahead.
502 */
503 for (start = dst; len > 0; len--) {
504 c = *src++;
505 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
506 if (dst == NULL) {
507 errno = ENOSPC;
508 goto out;
509 }
510 }
511
512 /* Terminate the string in the buffer. */
513 *dst = L'\0';
514
515 /*
516 * Output loop.
517 * Convert wchar_t string back to multibyte output string.
518 * If we have hit a multi-byte conversion error on input,
519 * output byte-by-byte here. Else use wctomb().
520 */
521 len = wcslen(start);
522 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
523 olen = 0;
524 for (dst = start; len > 0; len--) {
525 if (!cerr)
526 clen = wctomb(mbdst, *dst);
527 if (cerr || clen < 0) {
528 /*
529 * Conversion error, process as a byte(s) instead.
530 * Examine each byte and higher-order bytes for
531 * data. E.g.,
532 * 0x000000000000a264 -> a2 64
533 * 0x000000001f00a264 -> 1f 00 a2 64
534 */
535 clen = 0;
536 wmsk = 0;
537 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
538 shft = i * NBBY;
539 bmsk = (uint64_t)0xffLL << shft;
540 wmsk |= bmsk;
541 if ((*dst & wmsk) || i == 0)
542 mbdst[clen++] = (char)(
543 (uint64_t)(*dst & bmsk) >>
544 shft);
545 }
546 cerr = 1;
547 }
548 /* If this character would exceed our output limit, stop. */
549 if (olen + clen > (size_t)maxolen)
550 break;
551 /* Advance output pointer by number of bytes written. */
552 mbdst += clen;
553 /* Advance buffer character pointer. */
554 dst++;
555 /* Incrment output character count. */
556 olen += clen;
557 }
558
559 /* Terminate the output string. */
560 *mbdst = '\0';
561
562 if (flags & VIS_NOLOCALE) {
563 /* Pass conversion error flag out. */
564 if (cerr_ptr)
565 *cerr_ptr = cerr;
566 }
567
568 free(extra);
569 free(pdst);
570 free(psrc);
571
572 return (int)olen;
573 out:
574 free(extra);
575 free(pdst);
576 free(psrc);
577 return error;
578 }
579
580 static int
istrsenvisxl(char * mbdst,size_t * dlen,const char * mbsrc,int flags,const char * mbextra,int * cerr_ptr)581 istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc,
582 int flags, const char *mbextra, int *cerr_ptr)
583 {
584 return istrsenvisx(mbdst, dlen, mbsrc,
585 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr);
586 }
587
588 #endif
589
590 #if !HAVE_SVIS
591 /*
592 * The "svis" variants all take an "extra" arg that is a pointer
593 * to a NUL-terminated list of characters to be encoded, too.
594 * These functions are useful e. g. to encode strings in such a
595 * way so that they are not interpreted by a shell.
596 */
597
598 char *
svis(char * mbdst,int c,int flags,int nextc,const char * mbextra)599 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
600 {
601 char cc[2];
602 int ret;
603
604 cc[0] = c;
605 cc[1] = nextc;
606
607 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL);
608 if (ret < 0)
609 return NULL;
610 return mbdst + ret;
611 }
612
613 char *
snvis(char * mbdst,size_t dlen,int c,int flags,int nextc,const char * mbextra)614 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
615 {
616 char cc[2];
617 int ret;
618
619 cc[0] = c;
620 cc[1] = nextc;
621
622 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL);
623 if (ret < 0)
624 return NULL;
625 return mbdst + ret;
626 }
627
628 int
strsvis(char * mbdst,const char * mbsrc,int flags,const char * mbextra)629 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
630 {
631 return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL);
632 }
633
634 int
strsnvis(char * mbdst,size_t dlen,const char * mbsrc,int flags,const char * mbextra)635 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
636 {
637 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL);
638 }
639
640 int
strsvisx(char * mbdst,const char * mbsrc,size_t len,int flags,const char * mbextra)641 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
642 {
643 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
644 }
645
646 int
strsnvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags,const char * mbextra)647 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
648 const char *mbextra)
649 {
650 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
651 }
652
653 int
strsenvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags,const char * mbextra,int * cerr_ptr)654 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
655 const char *mbextra, int *cerr_ptr)
656 {
657 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
658 }
659 #endif
660
661 #if !HAVE_VIS
662 /*
663 * vis - visually encode characters
664 */
665 char *
vis(char * mbdst,int c,int flags,int nextc)666 vis(char *mbdst, int c, int flags, int nextc)
667 {
668 char cc[2];
669 int ret;
670
671 cc[0] = c;
672 cc[1] = nextc;
673
674 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL);
675 if (ret < 0)
676 return NULL;
677 return mbdst + ret;
678 }
679
680 char *
nvis(char * mbdst,size_t dlen,int c,int flags,int nextc)681 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
682 {
683 char cc[2];
684 int ret;
685
686 cc[0] = c;
687 cc[1] = nextc;
688
689 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL);
690 if (ret < 0)
691 return NULL;
692 return mbdst + ret;
693 }
694
695 /*
696 * strvis - visually encode characters from src into dst
697 *
698 * Dst must be 4 times the size of src to account for possible
699 * expansion. The length of dst, not including the trailing NULL,
700 * is returned.
701 */
702
703 int
strvis(char * mbdst,const char * mbsrc,int flags)704 strvis(char *mbdst, const char *mbsrc, int flags)
705 {
706 return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL);
707 }
708
709 int
strnvis(char * mbdst,size_t dlen,const char * mbsrc,int flags)710 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags)
711 {
712 return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL);
713 }
714
715 /*
716 * strvisx - visually encode characters from src into dst
717 *
718 * Dst must be 4 times the size of src to account for possible
719 * expansion. The length of dst, not including the trailing NULL,
720 * is returned.
721 *
722 * Strvisx encodes exactly len characters from src into dst.
723 * This is useful for encoding a block of data.
724 */
725
726 int
strvisx(char * mbdst,const char * mbsrc,size_t len,int flags)727 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
728 {
729 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL);
730 }
731
732 int
strnvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags)733 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
734 {
735 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL);
736 }
737
738 int
strenvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags,int * cerr_ptr)739 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
740 int *cerr_ptr)
741 {
742 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
743 }
744 #endif
745