awk equivalent code in C for printing NF Post: 302806101

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Top Forums Shell Programming and Scripting awk equivalent code in C for printing NF Post 302806101 by Corona688 on Sunday 12th of May 2013 01:34:52 PM

05-12-2013

Registered User

Quote:

Originally Posted by Akshay Hegde

Dear Jotne my intention is to know what awk will use internally when you type

Code:

awk 'END{print NF}' file

on terminal, in fact I am searching for c code to do the same..

This is an occasional misconception in programming languages... awk does not have a "print number of fields in end block" piece of code, that'd be an oddly specific thing to have. You'd have to find two separate, independent things in awk's source code:

1) Whatever sets the NF special variable.
2) Whatever causes the END code block to be run.

There are many ways to do it in C, but you almost certainly wouldn't be doing it the way awk does it, which can be quite complex -- some versions of awk let you use a regex for the field separator...

One way:

Code:

char fs=' ';
const char *p="a b c d e";
int nf=0;

// Keep looping until you can't find fs
while(p=strchr(p, fs)) nf++;

printf("nf=%d\n", nf);

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LEARN ABOUT CENTOS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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