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vecargs.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * string vector argv insertion
 */

#include <ast.h>
#include <vecargs.h>
#include <ctype.h>

/*
 * insert the string vector vec between
 * (*argvp)[0] and (*argvp)[1], sliding (*argvp)[1] ... over
 * null and blank args are deleted
 *
 * vecfree always called
 *
 * -1 returned if insertion failed
 */

int
vecargs(register char** vec, int* argcp, char*** argvp)
{
      register char**   argv;
      register char**   oargv;
      char**            ovec;
      char*       s;
      int         num;

      if (!vec) return(-1);
      if ((num = (char**)(*(vec - 1)) - vec) > 0)
      {
            if (!(argv = newof(0, char*, num + *argcp + 1, 0)))
            {
                  vecfree(vec, 0);
                  return(-1);
            }
            oargv = *argvp;
            *argvp = argv;
            *argv++ = *oargv++;
            ovec = vec;
            while (s = *argv = *vec++)
            {
                  while (isspace(*s)) s++;
                  if (*s) argv++;
            }
            vecfree(ovec, 1);
            while (*argv = *oargv++) argv++;
            *argcp = argv - *argvp;
      }
      else vecfree(vec, 0);
      return(0);
}

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