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Implement multibyte encoding support for -v with fallback

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MFC after:      7 days
This commit is contained in:
Andrey A. Chernov 2016-09-15 17:24:39 +00:00
parent bd20334ca0
commit 2aa6b16f74
1 changed files with 31 additions and 6 deletions
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37
bin/cat/cat.c
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@ -64,6 +64,8 @@ __FBSDID("$FreeBSD$");
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
static int rval;
@ -207,6 +209,7 @@ static void
cook_cat(FILE *fp)
{
int ch, gobble, line, prev;
wint_t wch;
/* Reset EOF condition on stdin. */
if (fp == stdin && feof(stdin))
@ -239,18 +242,40 @@ cook_cat(FILE *fp)
continue;
}
} else if (vflag) {
if (!isascii(ch) && !isprint(ch)) {
(void)ungetc(ch, fp);
/*
* Our getwc(3) doesn't change file position
* on error.
*/
if ((wch = getwc(fp)) == WEOF) {
if (ferror(fp) && errno == EILSEQ) {
clearerr(fp);
/* Resync attempt. */
memset(&fp->_mbstate, 0, sizeof(mbstate_t));
if ((ch = getc(fp)) == EOF)
break;
wch = ch;
goto ilseq;
} else
break;
}
if (!iswascii(wch) && !iswprint(wch)) {
ilseq:
if (putchar('M') == EOF || putchar('-') == EOF)
break;
ch = toascii(ch);
wch = toascii(wch);
}
if (iscntrl(ch)) {
if (putchar('^') == EOF ||
putchar(ch == '\177' ? '?' :
ch | 0100) == EOF)
if (iswcntrl(wch)) {
ch = toascii(wch);
ch = (ch == '\177') ? '?' : (ch | 0100);
if (putchar('^') == EOF || putchar(ch) == EOF)
break;
continue;
}
if (putwchar(wch) == WEOF)
break;
ch = -1;
continue;
}
if (putchar(ch) == EOF)
break;