openrc/src/librc-strlist.c

/*
   librc-strlist.h
   String list functions for using char ** arrays

   Copyright 2007 Gentoo Foundation
   Based on a previous implementation by Martin Schlemmer
   Released under the GPLv2
   */

#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

#include "rc.h"
#include "rc-misc.h"

char **rc_strlist_add (char **list, const char *item)
{
  char **newlist;
  int i = 0;

  if (! item)
    return (list);

  while (list && list[i])
    i++;

  newlist = rc_xrealloc (list, sizeof (char *) * (i + 2));
  newlist[i] = rc_xstrdup (item);
  newlist[i + 1] = NULL;

  return (newlist);
}

static char **_rc_strlist_addsort (char **list, const char *item,
				   int (*sortfunc) (const char *s1,
						    const char *s2))
{
  char **newlist;
  int i = 0;
  char *tmp1;
  char *tmp2;

  if (! item)
    return (list);

  while (list && list[i])
    i++;

  newlist = rc_xrealloc (list, sizeof (char *) * (i + 2));

  if (! i)
    newlist[i] = NULL;
  newlist[i + 1] = NULL;

  i = 0;
  while (newlist[i] && sortfunc (newlist[i], item) < 0)
    i++;

  tmp1 = newlist[i];
  newlist[i] = rc_xstrdup (item);
  do
    {
      i++;
      tmp2 = newlist[i];
      newlist[i] = tmp1;
      tmp1 = tmp2;
    } while (tmp1);

  return (newlist);
}

char **rc_strlist_addsort (char **list, const char *item)
{
  return (_rc_strlist_addsort (list, item, strcoll));
}

char **rc_strlist_addsortc (char **list, const char *item)
{
  return (_rc_strlist_addsort (list, item, strcmp));
}

char **rc_strlist_delete (char **list, const char *item)
{
  int i = 0;

  if (!list || ! item)
    return (list);

  while (list[i])
    if (! strcmp (list[i], item))
      {
	free (list[i]);
	do
	  {
	    list[i] = list[i + 1];
	    i++;
	  } while (list[i]);
      }

  return (list);
}

void rc_strlist_reverse (char **list)
{
  char *item;
  int i = 0;
  int j = 0;

  if (! list)
    return;

  while (list[j])
    j++;
  j--;

  while (i < j && list[i] && list[j])
    {
      item = list[i];
      list[i] = list[j];
      list[j] = item;
      i++;
      j--;
    }
}

void rc_strlist_free (char **list)
{
  int i = 0;

  if (! list)
    return;

  while (list[i])
    {
      free (list[i]);
      list[i++] = NULL;
    }

  free (list);
}