ref: 6e2b4fea1e5d6a18a15f8185d14cb615e173ab23
dir: /src/util.h/
/* General purpose, i.e. non SoX specific, utility functions and macros.
*
* (c) 2006-8 Chris Bagwell and SoX contributors
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xmalloc.h"
/*---------------------------- Portability stuff -----------------------------*/
#ifdef __GNUC__
#define NORET __attribute__((noreturn))
#define PRINTF __attribute__ ((format (printf, 1, 2)))
#define UNUSED __attribute__ ((unused))
#else
#define NORET
#define PRINTF
#define UNUSED
#endif
#ifdef _MSC_VER
#define __STDC__ 1
#define O_BINARY _O_BINARY
#define O_CREAT _O_CREAT
#define O_RDWR _O_RDWR
#define O_TRUNC _O_TRUNC
#define S_IFMT _S_IFMT
#define S_IFREG _S_IFREG
#define S_IREAD _S_IREAD
#define S_IWRITE _S_IWRITE
#define fdopen _fdopen
#define fstat _fstat
#define ftime _ftime
#define inline __inline
#define isatty _isatty
#define mktemp _mktemp
#define off_t _off_t
#define open _open
#define popen _popen
#define stat _stat
#define strdup _strdup
#define timeb _timeb
#define unlink _unlink
#endif
#if defined(DOS) || defined(WIN32) || defined(__NT__) || defined(__DJGPP__) || defined(__OS2__)
#define LAST_SLASH(path) max(strrchr(path, '/'), strrchr(path, '\\'))
#define IS_ABSOLUTE(path) ((path)[0] == '/' || (path)[0] == '\\' || (path)[1] == ':')
#define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#define LAST_SLASH(path) strrchr(path, '/')
#define IS_ABSOLUTE(path) ((path)[0] == '/')
#define SET_BINARY_MODE(file)
#endif
#ifdef WORDS_BIGENDIAN
#define MACHINE_IS_BIGENDIAN 1
#define MACHINE_IS_LITTLEENDIAN 0
#else
#define MACHINE_IS_BIGENDIAN 0
#define MACHINE_IS_LITTLEENDIAN 1
#endif
/*--------------------------- Language extensions ----------------------------*/
/* Compile-time ("static") assertion */
/* e.g. assert_static(sizeof(int) >= 4, int_type_too_small) */
#define assert_static(e,f) enum {assert_static__##f = 1/(e)}
#define array_length(a) (sizeof(a)/sizeof(a[0]))
#define field_offset(type, field) ((size_t)&(((type *)0)->field))
#define unless(x) if (!(x))
/*------------------------------- Maths stuff --------------------------------*/
#include <math.h>
#ifdef min
#undef min
#endif
#define min(a, b) ((a) <= (b) ? (a) : (b))
#ifdef max
#undef max
#endif
#define max(a, b) ((a) >= (b) ? (a) : (b))
#define range_limit(x, lower, upper) (min(max(x, lower), upper))
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef M_PI_2
#define M_PI_2 1.57079632679489661923 /* pi/2 */
#endif
#ifndef M_LN10
#define M_LN10 2.30258509299404568402 /* natural log of 10 */
#endif
#ifndef M_SQRT2
#define M_SQRT2 sqrt(2.)
#endif
#define sqr(a) ((a) * (a))
#define sign(x) ((x) < 0? -1 : 1)
/* Numerical Recipes in C, p. 284 */
#define ranqd1(x) ((x) = 1664525L * (x) + 1013904223L) /* int32_t x */
#define dranqd1(x) (ranqd1(x) * (1. / (65536. * 32768.))) /* [-1,1) */
#define dB_to_linear(x) exp((x) * M_LN10 * 0.05)
#define linear_to_dB(x) (log10(x) * 20)