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 #include "opkg_utils.h"
  23
  24 unsigned long 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         // Actually ((sfs.f_bavail * sfs.f_frsize) / 1024)
  33         // and here we try to avoid overflow.
  34         if (f.f_frsize >= 1024)
  35                 return (f.f_bavail * (f.f_frsize / 1024));
  36         else if (f.f_frsize > 0)
  37                 return f.f_bavail / (1024 / f.f_frsize);
  38
  39         opkg_msg(ERROR, "Unknown block size for target filesystem.\n");
  40
  41         return 0;
  42 }
  43
  44 /* something to remove whitespace, a hash pooper */
  45 char *trim_xstrdup(const char *src)
  46 {
  47         const char *end;
  48
  49         /* remove it from the front */
  50         while (src && isspace(*src) && *src)
  51                 src++;
  52
  53         end = src + (strlen(src) - 1);
  54
  55         /* and now from the back */
  56         while ((end > src) && isspace(*end))
  57                 end--;
  58
  59         end++;
  60
  61         /* xstrndup will NULL terminate for us */
  62         return xstrndup(src, end - src);
  63 }
  64
  65 int line_is_blank(const char *line)
  66 {
  67         const char *s;
  68
  69         for (s = line; *s; s++) {
  70                 if (!isspace(*s))
  71                         return 0;
  72         }
  73         return 1;
  74 }