1 /* $NetBSD: vis.c,v 1.71 2016/01/14 20:41:23 christos Exp $ */
4 * Copyright (c) 1989, 1993
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33 * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
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.
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
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55 * POSSIBILITY OF SUCH DAMAGE.
59 #if defined(LIBC_SCCS) && !defined(lint)
60 __RCSID("$NetBSD: vis.c,v 1.71 2016/01/14 20:41:23 christos Exp $");
61 #endif /* LIBC_SCCS and not lint */
63 #include <sys/types.h>
64 #include <sys/param.h>
73 #if !HAVE_VIS || !HAVE_SVIS
80 * The reason for going through the trouble to deal with character encodings
81 * in vis(3), is that we use this to safe encode output of commands. This
82 * safe encoding varies depending on the character set. For example if we
83 * display ps output in French, we don't want to display French characters
87 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
92 #if defined(LC_C_LOCALE)
93 #define iscgraph(c) isgraph_l(c, LC_C_LOCALE)
95 /* Keep it simple for now, no locale stuff */
96 #define iscgraph(c) isgraph(c)
104 ol = setlocale(LC_CTYPE, "C");
107 setlocale(LC_CTYPE, ol);
113 #define ISGRAPH(flags, c) \
114 (((flags) & VIS_NOLOCALE) ? iscgraph(c) : iswgraph(c))
116 #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
117 #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n')
118 #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r')
119 #define xtoa(c) L"0123456789abcdef"[c]
120 #define XTOA(c) L"0123456789ABCDEF"[c]
124 static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~";
125 static const wchar_t char_glob[] = L"*?[#";
128 * This is do_hvis, for HTTP style (RFC 1808)
131 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
135 || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
137 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
139 dst = do_svis(dst, c, flags, nextc, extra);
142 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
143 *dst++ = xtoa((unsigned int)c & 0xf);
150 * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
151 * NB: No handling of long lines or CRLF.
154 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
157 /* Space at the end of the line */
158 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
160 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
161 /* Specific char to be escaped */
162 wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
164 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
165 *dst++ = XTOA((unsigned int)c & 0xf);
167 dst = do_svis(dst, c, flags, nextc, extra);
172 * Output single byte of multibyte character.
175 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
177 if (flags & VIS_CSTYLE) {
180 *dst++ = L'\\'; *dst++ = L'n';
183 *dst++ = L'\\'; *dst++ = L'r';
186 *dst++ = L'\\'; *dst++ = L'b';
189 *dst++ = L'\\'; *dst++ = L'a';
192 *dst++ = L'\\'; *dst++ = L'v';
195 *dst++ = L'\\'; *dst++ = L't';
198 *dst++ = L'\\'; *dst++ = L'f';
201 *dst++ = L'\\'; *dst++ = L's';
204 *dst++ = L'\\'; *dst++ = L'0';
205 if (iswoctal(nextc)) {
210 /* We cannot encode these characters in VIS_CSTYLE
211 * because they special meaning */
223 case L'$': /* vis(1) -l */
226 if (ISGRAPH(flags, c) && !iswoctal(c)) {
233 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
235 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0';
236 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0';
237 *dst++ = (c & 07) + L'0';
239 if ((flags & VIS_NOSLASH) == 0)
263 * This is do_vis, the central code of vis.
264 * dst: Pointer to the destination buffer
265 * c: Character to encode
267 * nextc: The character following 'c'
268 * extra: Pointer to the list of extra characters to be
269 * backslash-protected.
272 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
274 int iswextra, i, shft;
277 iswextra = wcschr(extra, c) != NULL;
278 if (!iswextra && (ISGRAPH(flags, c) || iswwhite(c) ||
279 ((flags & VIS_SAFE) && iswsafe(c)))) {
284 /* See comment in istrsenvisx() output loop, below. */
286 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
288 bmsk = (uint64_t)0xffLL << shft;
290 if ((c & wmsk) || i == 0)
291 dst = do_mbyte(dst, (wint_t)(
292 (uint64_t)(c & bmsk) >> shft),
293 flags, nextc, iswextra);
299 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
302 * Return the appropriate encoding function depending on the flags given.
307 if (flags & VIS_HTTPSTYLE)
309 if (flags & VIS_MIMESTYLE)
315 * Expand list of extra characters to not visually encode.
318 makeextralist(int flags, const char *src)
325 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
328 if ((flags & VIS_NOLOCALE) || mbstowcs(dst, src, len) == (size_t)-1) {
330 for (i = 0; i < len; i++)
331 dst[i] = (wchar_t)(u_char)src[i];
334 d = dst + wcslen(dst);
336 if (flags & VIS_GLOB)
337 for (s = char_glob; *s; *d++ = *s++)
340 if (flags & VIS_SHELL)
341 for (s = char_shell; *s; *d++ = *s++)
344 if (flags & VIS_SP) *d++ = L' ';
345 if (flags & VIS_TAB) *d++ = L'\t';
346 if (flags & VIS_NL) *d++ = L'\n';
347 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
355 * The main internal function.
356 * All user-visible functions call this one.
359 istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength,
360 int flags, const char *mbextra, int *cerr_ptr)
362 wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
367 int clen = 0, cerr, error = -1, i, shft;
369 ssize_t mbslength, maxolen;
371 _DIAGASSERT(mbdstp != NULL);
372 _DIAGASSERT(mbsrc != NULL || mblength == 0);
373 _DIAGASSERT(mbextra != NULL);
376 * Input (mbsrc) is a char string considered to be multibyte
377 * characters. The input loop will read this string pulling
378 * one character, possibly multiple bytes, from mbsrc and
379 * converting each to wchar_t in src.
381 * The vis conversion will be done using the wide char
384 * This will then be converted back to a multibyte string to
385 * return to the caller.
388 /* Allocate space for the wide char strings */
389 psrc = pdst = extra = NULL;
391 if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL)
393 if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL)
395 if (*mbdstp == NULL) {
396 if ((mdst = calloc((4 * mblength) + 1, sizeof(*mdst))) == NULL)
405 if (flags & VIS_NOLOCALE) {
406 /* Do one byte at a time conversion */
409 /* Use caller's multibyte conversion error flag. */
410 cerr = cerr_ptr ? *cerr_ptr : 0;
415 * Handle up to mblength characters (not bytes). We do not
416 * stop at NULs because we may be processing a block of data
417 * that includes NULs.
419 mbslength = (ssize_t)mblength;
421 * When inputing a single character, must also read in the
422 * next character for nextc, the look-ahead character.
426 while (mbslength > 0) {
427 /* Convert one multibyte character to wchar_t. */
429 clen = mbtowc(src, mbsrc, MB_LEN_MAX);
430 if (cerr || clen < 0) {
431 /* Conversion error, process as a byte instead. */
432 *src = (wint_t)(u_char)*mbsrc;
438 * NUL in input gives 0 return value. process
439 * as single NUL byte and keep going.
442 /* Advance buffer character pointer. */
444 /* Advance input pointer by number of bytes read. */
446 /* Decrement input byte count. */
452 * In the single character input case, we will have actually
453 * processed two characters, c and nextc. Reset len back to
454 * just a single character.
459 /* Convert extra argument to list of characters for this mode. */
460 extra = makeextralist(flags, mbextra);
462 if (dlen && *dlen == 0) {
466 *mbdst = '\0'; /* can't create extra, return "" */
471 /* Look up which processing function to call. */
472 f = getvisfun(flags);
475 * Main processing loop.
476 * Call do_Xvis processing function one character at a time
477 * with next character available for look-ahead.
479 for (start = dst; len > 0; len--) {
481 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
488 /* Terminate the string in the buffer. */
493 * Convert wchar_t string back to multibyte output string.
494 * If we have hit a multi-byte conversion error on input,
495 * output byte-by-byte here. Else use wctomb().
498 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
500 for (dst = start; len > 0; len--) {
502 clen = wctomb(mbdst, *dst);
503 if (cerr || clen < 0) {
505 * Conversion error, process as a byte(s) instead.
506 * Examine each byte and higher-order bytes for
508 * 0x000000000000a264 -> a2 64
509 * 0x000000001f00a264 -> 1f 00 a2 64
513 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
515 bmsk = (uint64_t)0xffLL << shft;
517 if ((*dst & wmsk) || i == 0)
518 mbdst[clen++] = (char)(
519 (uint64_t)(*dst & bmsk) >>
524 /* If this character would exceed our output limit, stop. */
525 if (olen + clen > (size_t)maxolen)
527 /* Advance output pointer by number of bytes written. */
529 /* Advance buffer character pointer. */
531 /* Incrment output character count. */
535 /* Terminate the output string. */
538 if (flags & VIS_NOLOCALE) {
539 /* Pass conversion error flag out. */
558 istrsenvisxl(char **mbdstp, size_t *dlen, const char *mbsrc,
559 int flags, const char *mbextra, int *cerr_ptr)
561 return istrsenvisx(mbdstp, dlen, mbsrc,
562 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr);
569 * The "svis" variants all take an "extra" arg that is a pointer
570 * to a NUL-terminated list of characters to be encoded, too.
571 * These functions are useful e. g. to encode strings in such a
572 * way so that they are not interpreted by a shell.
576 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
584 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, mbextra, NULL);
591 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
599 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, mbextra, NULL);
606 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
608 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, mbextra, NULL);
612 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
614 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, mbextra, NULL);
618 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
620 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
624 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
627 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
631 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
632 const char *mbextra, int *cerr_ptr)
634 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
640 * vis - visually encode characters
643 vis(char *mbdst, int c, int flags, int nextc)
651 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, "", NULL);
658 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
666 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, "", NULL);
673 * strvis - visually encode characters from src into dst
675 * Dst must be 4 times the size of src to account for possible
676 * expansion. The length of dst, not including the trailing NULL,
681 strvis(char *mbdst, const char *mbsrc, int flags)
683 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, "", NULL);
687 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags)
689 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, "", NULL);
693 stravis(char **mbdstp, const char *mbsrc, int flags)
696 return istrsenvisxl(mbdstp, NULL, mbsrc, flags, "", NULL);
700 * strvisx - visually encode characters from src into dst
702 * Dst must be 4 times the size of src to account for possible
703 * expansion. The length of dst, not including the trailing NULL,
706 * Strvisx encodes exactly len characters from src into dst.
707 * This is useful for encoding a block of data.
711 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
713 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, "", NULL);
717 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
719 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", NULL);
723 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
726 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);