opkg-lede/libopkg/opkg_utils.c

/* 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"
#include "opkg_utils.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;
}