/*
 *  REDIR.C
 *
 *
 *
 *  Comments:
 *
 *  12/15/95 (Tim Norman) ---------------------------------------------------
 *    started.
 *
 */

#include <stdio.h>
#include <ctype.h>
#include <string.h>

int is_redir (char c)
{
   return c == '<' || c == '>' || c == '|';
}

/* gets the redirection from the command line and chops it out of the */
/* command line                                                       */
void get_redirection (char *s, char *in, char *out, char *pipe[128], int *num)
{
   int count, start, inquote = 0, numpipes = 0;

   /* find and remove all the redirections first */
   for (count = 0; s[count]; count++)
      if (s[count] == '"')
	 inquote = !inquote;
      else if (!inquote && (s[count] == '<' || s[count] == '>'))
      {
	 /* MS-DOS ignores multiple redirection symbols and uses the last */
	 /* redirection, so we'll emulate that and not check */

	 /* find the next word */
	 start = count;
	 count++;

	 /* skip over whitespace */
	 while (isspace (s[count]))
	    count++;

	 /* skip until we hit whitespace or a delimiter of some sort */
	 while (!is_redir (s[count]) && s[count] && !isspace (s[count]))
	    count++;

	 if (s[start] == '<')
	 {
	    memcpy (in, &s[start+1], count - start - 1);
	    in[count - start - 1] = 0;
	 }
	 else if (s[start] == '>')
	 {
	    memcpy (out, &s[start+1], count - start - 1);
	    out[count - start - 1] = 0;
	 }

	 memmove (&s[start], &s[count], strlen (&s[count]) + 1);

	 /* move back one so we can check this character */
	 count = start - 1;
      }

   /* now go after the pipes */

   pipe[numpipes++] = s;

   for (count = 0; s[count]; count++)
      if (s[count] == '"')
	 inquote = !inquote;
      else if (!inquote && s[count] == '|')
      {
	 s[count] = 0;

	 pipe[numpipes++] = &s[count + 1];
      }

   pipe[numpipes] = NULL;

   *num = numpipes;
}