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Don't split multibyte characters when the -n option is specified.

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This commit is contained in:
Tim J. Robbins 2002-06-08 07:27:21 +00:00
parent 1b5e0369d7
commit 393cf5088e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=98035
2 changed files with 97 additions and 4 deletions
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13
usr.bin/cut/cut.1
View file

@ -115,6 +115,19 @@ Do not split multi-byte characters.
Suppress lines with no field delimiter characters.
Unless specified, lines with no delimiters are passed through unmodified.
.El
.Sh ENVIRONMENT
The
.Ev LANG ,
.Ev LC_ALL
and
.Ev LC_CTYPE
environment variables affect the execution of
.Nm
if the
.Fl n
option is specified.
Their effect is described in
.Xr environ 7 .
.Sh DIAGNOSTICS
.Ex -std
.Sh SEE ALSO

88
usr.bin/cut/cut.c
View file

@ -52,12 +52,15 @@ static const char rcsid[] =
#include <string.h>
#include <unistd.h>
int bflag;
int cflag;
char dchar;
int dflag;
int fflag;
int nflag;
int sflag;
void b_n_cut(FILE *, const char *);
void c_cut(FILE *, const char *);
void f_cut(FILE *, const char *);
void get_list(char *);
@ -79,11 +82,17 @@ main(argc, argv)
fcn = NULL;
dchar = '\t'; /* default delimiter is \t */
/* Since we don't support multi-byte characters, the -c and -b
options are equivalent, and the -n option is meaningless. */
/*
* Since we don't support multi-byte characters, the -c and -b
* options are equivalent.
*/
while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
switch(ch) {
case 'b':
fcn = c_cut;
get_list(optarg);
bflag = 1;
break;
case 'c':
fcn = c_cut;
get_list(optarg);
@ -102,6 +111,7 @@ main(argc, argv)
sflag = 1;
break;
case 'n':
nflag = 1;
break;
case '?':
default:
@ -111,10 +121,15 @@ main(argc, argv)
argv += optind;
if (fflag) {
if (cflag)
if (bflag || cflag || nflag)
usage();
} else if (!cflag || dflag || sflag)
} else if (!(bflag || cflag) || dflag || sflag)
usage();
else if (!bflag && nflag)
usage();
if (nflag)
fcn = b_n_cut;
rval = 0;
if (*argv)
@ -217,6 +232,71 @@ needpos(size_t n)
}
}
/*
* Cut based on byte positions, taking care not to split multibyte characters.
* Although this function also handles the case where -n is not specified,
* c_cut() ought to be much faster.
*/
void
b_n_cut(fp, fname)
FILE *fp;
const char *fname;
{
size_t col, i, lbuflen;
char *lbuf;
int canwrite, clen, warned;
warned = 0;
while ((lbuf = fgetln(fp, &lbuflen)) != NULL) {
for (col = 0; lbuflen > 0; col += clen) {
if ((clen = mblen(lbuf, lbuflen)) < 0) {
if (!warned) {
warn("%s", fname);
warned = 1;
}
clen = 1;
}
if (clen == 0 || *lbuf == '\n')
break;
if (col < maxval && !positions[1 + col]) {
/*
* Print the character if (1) after an initial
* segment of un-selected bytes, the rest of
* it is selected, and (2) the last byte is
* selected.
*/
i = col;
while (i < col + clen && i < maxval &&
!positions[1 + i])
i++;
canwrite = i < col + clen;
for (; i < col + clen && i < maxval; i++)
canwrite &= positions[1 + i];
if (canwrite)
fwrite(lbuf, 1, clen, stdout);
} else {
/*
* Print the character if all of it has
* been selected.
*/
canwrite = 1;
for (i = col; i < col + clen; i++)
if ((i >= maxval && !autostop) ||
(i < maxval && !positions[1 + i])) {
canwrite = 0;
break;
}
if (canwrite)
fwrite(lbuf, 1, clen, stdout);
}
lbuf += clen;
lbuflen -= clen;
}
if (lbuflen > 0)
putchar('\n');
}
}
void
c_cut(fp, fname)
FILE *fp;