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Starting NXFFS packing logic

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3553 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2011-05-03 00:02:10 +00:00
parent 40c085d15a
commit d86f33e88c
7 changed files with 402 additions and 169 deletions
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lib/stdlib/lib_rand.c
+44 -36
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@@ -1,7 +1,7 @@
/************************************************************
* lib/stdlib/lib_rand.c
*
* Copyright (C) 2007,l 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@@ -48,8 +48,8 @@
* Definitions
************************************************************/
#ifndef RND_ORDER
#define RND_ORDER 1
#ifndef CONFIG_LIB_RAND_ORDER
#define CONFIG_LIB_RAND_ORDER 1
#endif
/* Values needed by the random number generator */
@@ -64,9 +64,9 @@
#define RND3_CONSTK3 616087
#define RND3_CONSTP 997783
#if RND_ORDER == 1
#if CONFIG_LIB_RAND_ORDER == 1
# define RND_CONSTP RND1_CONSTP
#elif RND_ORDER == 2
#elif CONFIG_LIB_RAND_ORDER == 2
# define RND_CONSTP RND2_CONSTP
#else
# define RND_CONSTP RND3_CONSTP
@@ -82,9 +82,9 @@
static unsigned int nrand(unsigned int nLimit);
static double_t frand1(void);
#if (RND_ORDER > 1)
#if (CONFIG_LIB_RAND_ORDER > 1)
static double_t frand2(void);
#if (RND_ORDER > 2)
#if (CONFIG_LIB_RAND_ORDER > 2)
static double_t frand3(void);
#endif
#endif
@@ -106,37 +106,17 @@ static double_t frand3(void);
************************************************************/
static unsigned long g_nRandInt1;
#if (RND_ORDER > 1)
#if (CONFIG_LIB_RAND_ORDER > 1)
static unsigned long g_nRandInt2;
#if (RND_ORDER > 2)
#if (CONFIG_LIB_RAND_ORDER > 2)
static unsigned long g_nRandInt3;
#endif
#endif
/************************************************************
* Function: srand, rand
* Private Functions
************************************************************/
void srand(unsigned int seed)
{
g_nRandInt1 = seed;
#if (RND_ORDER > 1)
g_nRandInt2 = seed;
(void)frand1();
#if (RND_ORDER > 2)
g_nRandInt3 = seed;
(void)frand2();
#endif
#endif
} /* end srand */
int rand(void)
{
return (int)nrand(32768);
} /* end rand */
static unsigned int nrand(unsigned int nLimit)
{
unsigned long nResult;
@@ -146,9 +126,9 @@ static unsigned int nrand(unsigned int nLimit)
do {
/* Get a random integer in the requested range */
#if (RND_ORDER == 1)
#if (CONFIG_LIB_RAND_ORDER == 1)
fRatio = frand1();
#elif (RND_ORDER == 2)
#elif (CONFIG_LIB_RAND_ORDER == 2)
fRatio = frand2();
#else
fRatio = frand3();
@@ -176,7 +156,7 @@ static double_t frand1(void)
} /* end frand */
#if (RND_ORDER > 1)
#if (CONFIG_LIB_RAND_ORDER > 1)
static double_t frand2(void)
{
unsigned long nRandInt;
@@ -192,8 +172,8 @@ static double_t frand2(void)
} /* end frand */
#if (RND_ORDER > 2)
static double_t frand(void)
#if (CONFIG_LIB_RAND_ORDER > 2)
static double_t frand3(void)
{
unsigned long nRandInt;
@@ -210,3 +190,31 @@ static double_t frand(void)
} /* end frand */
#endif
#endif
/************************************************************
* Public Functions
************************************************************/
/************************************************************
* Function: srand, rand
************************************************************/
void srand(unsigned int seed)
{
g_nRandInt1 = seed;
#if (CONFIG_LIB_RAND_ORDER > 1)
g_nRandInt2 = seed;
(void)frand1();
#if (CONFIG_LIB_RAND_ORDER > 2)
g_nRandInt3 = seed;
(void)frand2();
#endif
#endif
} /* end srand */
int rand(void)
{
return (int)nrand(32768);
} /* end rand */