how to validate a field when it is blank using awk prog Post: 302354662

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LEARN ABOUT NETBSD

isblank

ISBLANK(3)						   BSD Library Functions Manual 						ISBLANK(3)

NAME

     isblank -- blank-space character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     isblank(int c);

DESCRIPTION

     The isblank() function tests for the standard blank-space characters.  The standard blank-space characters are the following:

	   ' '	  Space character.
	   		  Horizontal tab.

     In the ``C'' locale, isblank() returns true only for the standard blank-space characters.

RETURN VALUES

     The isblank() function returns zero if the character tests false and returns non-zero if the character tests true.

SEE ALSO

     ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
     isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

CAVEATS

     The argument to isblank() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined.	See the CAVEATS section of
     ctype(3) for more details.

BSD
								  April 17, 2008							       BSD