libopkg/opkg_utils.c

   1 /* opkg_utils.c - the opkg package management system
   2
   3    Steven M. Ayer
   4
   5    Copyright (C) 2002 Compaq Computer Corporation
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2, or (at
  10    your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16 */
  17
  18 #include <ctype.h>
  19 #include <sys/statvfs.h>
  20
  21 #include "libbb/libbb.h"
  22
  23 unsigned long
  24 get_available_kbytes(char * filesystem)
  25 {
  26     struct statvfs f;
  27
  28     if (statvfs(filesystem, &f) == -1) {
  29         opkg_perror(ERROR, "Failed to statvfs for %s", filesystem);
  30         return 0;
  31     }
  32
  33     // Actually ((sfs.f_bavail * sfs.f_frsize) / 1024)
  34     // and here we try to avoid overflow.
  35     if (f.f_frsize >= 1024)
  36         return (f.f_bavail * (f.f_frsize / 1024));
  37     else if (f.f_frsize > 0)
  38         return f.f_bavail / (1024 / f.f_frsize);
  39
  40     opkg_msg(ERROR, "Unknown block size for target filesystem.\n");
  41
  42     return 0;
  43 }
  44
  45 /* something to remove whitespace, a hash pooper */
  46 char *trim_xstrdup(const char *src)
  47 {
  48      const char *end;
  49
  50      /* remove it from the front */
  51      while(src &&
  52            isspace(*src) &&
  53            *src)
  54           src++;
  55
  56      end = src + (strlen(src) - 1);
  57
  58      /* and now from the back */
  59      while((end > src) &&
  60            isspace(*end))
  61           end--;
  62
  63      end++;
  64
  65      /* xstrndup will NULL terminate for us */
  66      return xstrndup(src, end-src);
  67 }
  68
  69 int line_is_blank(const char *line)
  70 {
  71      const char *s;
  72
  73      for (s = line; *s; s++) {
  74           if (!isspace(*s))
  75                return 0;
  76      }
  77      return 1;
  78 }