02-07-2005
Quote:
Originally Posted by vgersh99
I believe the above 'awk':
1. will not work for the multi-byte character sets as 'substr' is a character based operation [not a byte oriented one].
2. will not work on LARGE files as most awks [at least Solaris' stock ones] have inherited limits on the lenght of records [RS], number of fields [NF] etc....
It might work in some isolated cases, but it is not a generic solution.
Do you know the limit on awks for length of records? I am only interested in the first 80 bytes of the line, does that make a difference? Also, can't I equate a byte = 1 character?
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FWIDE(3) Linux Programmer's Manual FWIDE(3)
NAME
fwide - set and determine the orientation of a FILE stream
SYNOPSIS
#include <wchar.h>
int fwide(FILE *stream, int mode);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fwide(): _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
DESCRIPTION
When mode is zero, the fwide() function determines the current orientation of stream. It returns a positive value if stream is wide-char-
acter oriented, that is, if wide-character I/O is permitted but char I/O is disallowed. It returns a negative value if stream is byte ori-
ented, i.e., if char I/O is permitted but wide-character I/O is disallowed. It returns zero if stream has no orientation yet; in this case
the next I/O operation might change the orientation (to byte oriented if it is a char I/O operation, or to wide-character oriented if it is
a wide-character I/O operation).
Once a stream has an orientation, it cannot be changed and persists until the stream is closed.
When mode is nonzero, the fwide() function first attempts to set stream's orientation (to wide-character oriented if mode is greater than
0, or to byte oriented if mode is less than 0). It then returns a value denoting the current orientation, as above.
RETURN VALUE
The fwide() function returns the stream's orientation, after possibly changing it. A positive return value means wide-character oriented.
A negative return value means byte oriented. A return value of zero means undecided.
CONFORMING TO
C99, POSIX.1-2001.
NOTES
Wide-character output to a byte oriented stream can be performed through the fprintf(3) function with the %lc and %ls directives.
Char oriented output to a wide-character oriented stream can be performed through the fwprintf(3) function with the %c and %s directives.
SEE ALSO
fprintf(3), fwprintf(3)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2007-07-26 FWIDE(3)