/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
static void
process(FILE *fp)
{
static int col = 0;
static char nul[] = "\0";
char *cp = nul + 1; /* so *(cp-1) starts out != '\n' */
wint_t c, c1, rachar;
char mbibuff[2 * MB_LEN_MAX + 1]; /* max space for 2 wchars */
char buff[4 * MB_LEN_MAX + 1]; /* max encoding length for one char */
int mbilen, cerr = 0, raerr = 0;
/*
* The input stream is considered to be multibyte characters.
* The input loop will read this data inputing one character,
* possibly multiple bytes, at a time and converting each to
* a wide character wchar_t.
*
* The vis(3) functions, however, require single either bytes
* or a multibyte string as their arguments. So we convert
* our input wchar_t and the following look-ahead wchar_t to
* a multibyte string for processing by vis(3).
*/
/* Read one multibyte character, store as wchar_t */
c = getwc(fp);
if (c == WEOF && errno == EILSEQ) {
/* Error in multibyte data. Read one byte. */
c = (wint_t)getc(fp);
cerr = 1;
}
while (c != WEOF) {
/* Clear multibyte input buffer. */
memset(mbibuff, 0, sizeof(mbibuff));
/* Read-ahead next multibyte character. */
if (!cerr)
rachar = getwc(fp);
if (cerr || (rachar == WEOF && errno == EILSEQ)) {
/* Error in multibyte data. Read one byte. */
rachar = (wint_t)getc(fp);
raerr = 1;
}
if (none) {
/* Handle -n flag. */
cp = buff;
*cp++ = c;
if (c == '\\')
*cp++ = '\\';
*cp = '\0';
} else if (markeol && c == '\n') {
/* Handle -l flag. */
cp = buff;
if ((eflags & VIS_NOSLASH) == 0)
*cp++ = '\\';
*cp++ = '$';
*cp++ = '\n';
*cp = '\0';
} else {
/*
* Convert character using vis(3) library.
* At this point we will process one character.
* But we must pass the vis(3) library this
* character plus the next one because the next
* one is used as a look-ahead to decide how to
* encode this one under certain circumstances.
*
* Since our characters may be multibyte, e.g.,
* in the UTF-8 locale, we cannot use vis() and
* svis() which require byte input, so we must
* create a multibyte string and use strvisx().
*/
/* Treat EOF as a NUL char. */
c1 = rachar;
if (c1 == WEOF)
c1 = L'\0';
/*
* If we hit a multibyte conversion error above,
* insert byte directly into string buff because
* wctomb() will fail. Else convert wchar_t to
* multibyte using wctomb().
*/
if (cerr) {
*mbibuff = (char)c;
mbilen = 1;
} else
mbilen = wctomb(mbibuff, c);
/* Same for look-ahead character. */
if (raerr)
mbibuff[mbilen] = (char)c1;
else
wctomb(mbibuff + mbilen, c1);
/* Perform encoding on just first character. */
(void) strsenvisx(buff, 4 * MB_LEN_MAX, mbibuff,
1, eflags, extra, &cerr);
}
cp = buff;
if (fold) {
#ifdef DEBUG
if (debug)
(void)printf("<%02d,", col);
#endif
col = foldit(cp, col, foldwidth, eflags);
#ifdef DEBUG
if (debug)
(void)printf("%02d>", col);
#endif
}
do {
(void)putchar(*cp);
} while (*++cp);
c = rachar;
cerr = raerr;
}
/*
* terminate partial line with a hidden newline
*/
if (fold && *(cp - 1) != '\n')
(void)printf(eflags & VIS_MIMESTYLE ? "=\n" : "\\\n");
}
