1  #include <stdlib.h>
       2  #include <string.h>
       3  
       4  char **
       5  buildargv (char *input)
       6  {
       7    static char *arglist[256];
       8    int numargs = 0;
       9  
      10    while (1)
      11      {
      12        while (*input == ' ')
      13  	input++;
      14        if (*input == 0)
      15  	break;
      16        arglist [numargs++] = input;
      17        while (*input != ' ' && *input != 0)
      18  	input++;
      19        if (*input == 0)
      20  	break;
      21        *(input++) = 0;
      22      }
      23    arglist [numargs] = NULL;
      24    return arglist;
      25  }
      26  
      27  
      28  int main()
      29  {
      30    char **args;
      31    char input[256];
      32    int i;
      33  
      34    strcpy(input, " a b");
      35    args = buildargv(input);
      36  
      37    if (strcmp (args[0], "a"))
      38      abort ();
      39    if (strcmp (args[1], "b"))
      40      abort ();
      41    if (args[2] != NULL)
      42      abort ();
      43    
      44    exit (0);
      45  }