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Full Discussion: How to pass C array as input to Shell script
Top Forums Programming How to pass C array as input to Shell script Post 302312086 by Corona688 on Thursday 30th of April 2009 10:25:50 AM
Old 04-30-2009
Code tags for code please. [code] stuff [/code] without the extra spaces in the tags.

Your array is too big. You specify that it has two elements but give it three initializers. This probably produces a warning.

To do what you want you need to convert it into a string. If it will always just have three initializers it could probably be made simpler but this should work for any size of array.
Code:
#include <stdio.h>
// for execlp()
#include <unistd.h>

int main()
{
  const char *script="echo";
  const char *prefix="";
  int pos=0, n;
  char buf[256];
  int a[3]={1,2,3};

  for(n=0; n<3; n++)
  {
    pos+=snprintf(buf+pos, 256-pos, "%s%d", prefix, a[n]);
  }
  printf("will call %s with %s\n", script, buf);

  // Note that this command never returns unless it fails to run at all.
  execlp(script, script, buf, NULL);
  // If the program is still running, then execlp failed, so return error
  return(1);
}

Last edited by vgersh99; 04-30-2009 at 12:14 PM.. Reason: added
 

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LEARN ABOUT DEBIAN

shcomp

SHCOMP(1)						    User Environment Utilities							 SHCOMP(1)

NAME

       shcomp - compile a ksh93 shell script

SYNOPSIS

       shcomp [ options ] [infile] [outfile]]

ORIGIN OF THIS MAN PAGE

       This man page was written by Christophe Martin <Schplurtz@free.fr> for the Debian GNU/Linux system. It is based on "shcomp --man" output.

DESCRIPTION

       Unless  -D  is  specified,  shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 can read and execute
       with the same effect as the original script.

       Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly.

       If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages	that  need  to	be  translated	to
       locale specific versions for internationalization.

       If  outfile is omitted, then the results will be written to standard output.  If infile is also omitted, the shell script will be read from
       standard input.

OPTIONS

       -D, --dictionary
	      Generate a list of strings that need to be placed in a message catalog for internationalization.

       -n, --noexec
	      Displays warning messages for obsolete or non-conforming constructs.

       -v, --verbose
	      Displays input from infile onto standard error as it reads it.

       --man  Displays this man page on standard error and exits.

       --help Shows a short help message and exits.

EXIT STATUS

       0      Successful completion.

       >0     An error occurred.

DEBIAN WARNING

       On a Debian GNU/Linux system, more than one package may provide ksh. the output of shcomp can only be used by ksh93.  Any other ksh will be
       unable to run the compiled script.

EXAMPLE

       ( echo '#! /bin/ksh93' ; shcomp myscript ) > myscript.bin &&
       chmod 755 myscript.bin
       ./myscript.bin

SEE ALSO

       ksh(1)

IMPLEMENTATION

       version	       shcomp (AT&T Labs Research) 2012-02-29
       author	       David Korn <dgk@research.att.com>
       copyright       Copyright (c) 1982-2012 AT&T Intellectual Property
       license	       http://www.eclipse.org/org/documents/epl-v10.html

KSH93								  Fri Jun 3 2005							 SHCOMP(1)
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