Alternative for wc -l Post: 302462844

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Top Forums Shell Programming and Scripting Alternative for wc -l Post 302462844 by zaxxon on Friday 15th of October 2010 07:39:44 AM

10-15-2010

Registered User

@Methyl
Maybe use printf instead?

I think wc is just optimized for this task. Anyway here is a little C program you can compile with your favourite C compiler, for example:

Code:

gcc -Wall -o wcc wcc.c
# and then issue
./wcc yourfile

and try it out.

Code:

#include <stdio.h>
#include <stdlib.h>


#define MAX 2048

int main(int argc, char** argv)
{
        char zbuf[MAX];
        long int z=0;
        FILE *fp;

        fp=fopen(argv[1],"r");
        if( !fp )
        {
                fprintf(stderr, "Error: File %s could not be opened.\n", argv[1]);
                exit (EXIT_FAILURE);
        }
        else
        {
                while ( fgets(zbuf, MAX, fp) )
                {
                        z++;
                }
        }
        fclose(fp);
        printf("Line count: %li\n", z);
        exit (EXIT_SUCCESS);
        return 0;
}

I have set the maximum line length to 2048 - maybe you want to increase this if it is not sufficient for your file. Maybe worth a try. I am no C programmer so maybe someone has even an idea to improve it.

It could be also the case that your hardware/OS is the bottle neck - just a guess.

Last edited by zaxxon; 10-15-2010 at 09:01 AM.. Reason: changed printf to long integer according to definition of z

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catanhf

CATANH(3)						     Linux Programmer's Manual							 CATANH(3)

NAME

       catanh, catanhf, catanhl - complex arc tangents hyperbolic

SYNOPSIS

       #include <complex.h>

       double complex catanh(double complex z);
       float complex catanhf(float complex z);
       long double complex catanhl(long double complex z);

       Link with -lm.

DESCRIPTION

       The catanh() function calculates the complex arc hyperbolic tangent of z.  If y = catanh(z), then z = ctanh(y).	The imaginary part of y is
       chosen in the interval [-pi/2,pi/2].

       One has:

	   catanh(z) = 0.5 * (clog(1 + z) - clog(1 - z))

VERSIONS

       These functions first appeared in glibc in version 2.1.

CONFORMING TO

       C99.

EXAMPLE

       /* Link with "-lm" */

       #include <complex.h>
       #include <stdlib.h>
       #include <unistd.h>
       #include <stdio.h>

       int
       main(int argc, char *argv[])
       {
	   double complex z, c, f;

	   if (argc != 3) {
	       fprintf(stderr, "Usage: %s <real> <imag>
", argv[0]);
	       exit(EXIT_FAILURE);
	   }

	   z = atof(argv[1]) + atof(argv[2]) * I;

	   c = catanh(z);
	   printf("catanh() = %6.3f %6.3f*i
", creal(c), cimag(c));

	   f = 0.5 * (clog(1 + z) - clog(1 - z));
	   printf("formula  = %6.3f %6.3f*i
", creal(f2), cimag(f2));

	   exit(EXIT_SUCCESS);
       }

SEE ALSO

       atanh(3), cabs(3), cimag(3), ctanh(3), complex(7)

COLOPHON

       This page is part of release 3.44 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/.

								    2011-09-15								 CATANH(3)