usr/src/lib/libast/common/vec/vecargs.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * Glenn Fowler
  25  * AT&T Bell Laboratories
  26  *
  27  * string vector argv insertion
  28  */
  29
  30 #include <ast.h>
  31 #include <vecargs.h>
  32 #include <ctype.h>
  33
  34 /*
  35  * insert the string vector vec between
  36  * (*argvp)[0] and (*argvp)[1], sliding (*argvp)[1] ... over
  37  * null and blank args are deleted
  38  *
  39  * vecfree always called
  40  *
  41  * -1 returned if insertion failed
  42  */
  43
  44 int
  45 vecargs(register char** vec, int* argcp, char*** argvp)
  46 {
  47         register char** argv;
  48         register char** oargv;
  49         char**          ovec;
  50         char*           s;
  51         int             num;
  52
  53         if (!vec) return(-1);
  54         if ((num = (char**)(*(vec - 1)) - vec) > 0)
  55         {
  56                 if (!(argv = newof(0, char*, num + *argcp + 1, 0)))
  57                 {
  58                         vecfree(vec, 0);
  59                         return(-1);
  60                 }
  61                 oargv = *argvp;
  62                 *argvp = argv;
  63                 *argv++ = *oargv++;
  64                 ovec = vec;
  65                 while (s = *argv = *vec++)
  66                 {
  67                         while (isspace(*s)) s++;
  68                         if (*s) argv++;
  69                 }
  70                 vecfree(ovec, 1);
  71                 while (*argv = *oargv++) argv++;
  72                 *argcp = argv - *argvp;
  73         }
  74         else vecfree(vec, 0);
  75         return(0);
  76 }