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/*
* Copyright 2004 Timo Hirvonen
*
* 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 of the
* License, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _UTILS_H
#define _UTILS_H
#include "config/utils.h"
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <time.h>
#include <inttypes.h>
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif
#define N_ELEMENTS(array) (sizeof(array) / sizeof((array)[0]))
#define getentry(ptr, offset, type) (*((type *) ((char *) (ptr) + (offset))))
static inline int min(int a, int b)
{
return a < b ? a : b;
}
static inline int max(int a, int b)
{
return a > b ? a : b;
}
static inline int clamp(int val, int minval, int maxval)
{
if (val < minval)
return minval;
if (val > maxval)
return maxval;
return val;
}
static inline int scale_from_percentage(int val, int max_val)
{
if (val < 0)
return (val * max_val - 50) / 100;
return (val * max_val + 50) / 100;
}
static inline int scale_to_percentage(int val, int max_val)
{
int half = max_val / 2;
if (max_val <= 0)
return 100;
if (val < 0)
return (val * 100 - half) / max_val;
return (val * 100 + half) / max_val;
}
static inline int str_to_int(const char *str, long int *val)
{
char *end;
*val = strtol(str, &end, 10);
if (*str == 0 || *end != 0)
return -1;
return 0;
}
static inline int strcmp0(const char *str1, const char *str2)
{
if (!str1)
return str2 ? -1 : 0;
if (!str2)
return 1;
return strcmp(str1, str2);
}
static inline time_t file_get_mtime(const char *filename)
{
struct stat s;
/* stat follows symlinks, lstat does not */
if (stat(filename, &s) == -1)
return -1;
return s.st_mtime;
}
static inline void ns_sleep(int ns)
{
struct timespec req;
req.tv_sec = 0;
req.tv_nsec = ns;
nanosleep(&req, NULL);
}
static inline void us_sleep(int us)
{
ns_sleep(us * 1e3);
}
static inline void ms_sleep(int ms)
{
ns_sleep(ms * 1e6);
}
static inline int is_url(const char *name)
{
return strncmp(name, "http://", 7) == 0;
}
static inline int is_freeform_true(const char *c)
{
return c[0] == '1' ||
c[0] == 'y' || c[0] == 'Y' ||
c[0] == 't' || c[0] == 'T';
}
/* e.g. NetBSD */
#if defined(bswap16)
/* GNU libc */
#elif defined(bswap_16)
# define bswap16 bswap_16
/* e.g. OpenBSD */
#elif defined(swap16)
# define bswap16 swap16
#else
# define bswap16(x) \
((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
#endif
static inline uint16_t swap_uint16(uint16_t x)
{
return bswap16(x);
}
/* e.g. NetBSD */
#if defined(bswap32)
/* GNU libc */
#elif defined(bswap_32)
# define bswap32 bswap_32
/* e.g. OpenBSD */
#elif defined(swap32)
# define bswap32 swap32
#else
# define bswap32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#endif
static inline uint32_t swap_uint32(uint32_t x)
{
return bswap32(x);
}
static inline uint32_t read_le32(const char *buf)
{
const unsigned char *b = (const unsigned char *)buf;
return b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
}
static inline uint16_t read_le16(const char *buf)
{
const unsigned char *b = (const unsigned char *)buf;
return b[0] | (b[1] << 8);
}
#endif
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