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utils.h

/*
 * 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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