/* opkg_utils.c - the opkg package management system

   Steven M. Ayer

   Copyright (C) 2002 Compaq Computer Corporation

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#include <ctype.h>
#include <sys/statvfs.h>

#include "libbb/libbb.h"

unsigned long
get_available_kbytes(char * filesystem)
{
    struct statvfs f;

    if (statvfs(filesystem, &f) == -1) {
        opkg_perror(ERROR, "Failed to statvfs for %s", filesystem);
        return 0;
    }

    // Actually ((sfs.f_bavail * sfs.f_frsize) / 1024)
    // and here we try to avoid overflow.
    if (f.f_frsize >= 1024)
        return (f.f_bavail * (f.f_frsize / 1024));
    else if (f.f_frsize > 0)
        return f.f_bavail / (1024 / f.f_frsize);

    opkg_msg(ERROR, "Unknown block size for target filesystem.\n");

    return 0;
}

/* something to remove whitespace, a hash pooper */
char *trim_xstrdup(const char *src)
{
     const char *end;

     /* remove it from the front */
     while(src &&
	   isspace(*src) &&
	   *src)
	  src++;

     end = src + (strlen(src) - 1);

     /* and now from the back */
     while((end > src) &&
	   isspace(*end))
	  end--;

     end++;

     /* xstrndup will NULL terminate for us */
     return xstrndup(src, end-src);
}

int line_is_blank(const char *line)
{
     const char *s;

     for (s = line; *s; s++) {
	  if (!isspace(*s))
	       return 0;
     }
     return 1;
}