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Restored compatibility with non-C99 platforms by sticking to Contiki datatypes.

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oliverschmidt 2007-08-10 08:01:17 +00:00
parent 296ad6cdb7
commit 5038537b8f
2 changed files with 12 additions and 12 deletions
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18
core/lib/rand.c
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@ -28,7 +28,7 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: rand.c,v 1.7 2007/07/03 13:26:00 bg- Exp $ * @(#)$Id: rand.c,v 1.8 2007/08/10 08:01:17 oliverschmidt Exp $
*/ */
#include <stdlib.h> #include <stdlib.h>
@ -61,21 +61,21 @@ CTASSERT(RAND_MAX == 0x7fff);
* When possible, keep rand_state across reboots. * When possible, keep rand_state across reboots.
*/ */
#ifdef __GNUC__ #ifdef __GNUC__
int32_t rand_state __attribute__((section(".noinit"))); s32_t rand_state __attribute__((section(".noinit")));
#else #else
int32_t rand_state = 1; s32_t rand_state = 1;
#endif #endif
int int
rand(void) rand(void)
{ {
uint32_t hi, lo; u32_t hi, lo;
/* /*
* Perform two 16x16 bits multiplication with 32 bit results. * Perform two 16x16 bits multiplication with 32 bit results.
*/ */
lo = 16807ul * (uint16_t)(rand_state); lo = 16807ul * (u16_t)(rand_state);
hi = 16807ul * (uint16_t)(rand_state >> 16); hi = 16807ul * (u16_t)(rand_state >> 16);
lo += (hi & 0x7fff) << 16; lo += (hi & 0x7fff) << 16;
@ -83,14 +83,14 @@ rand(void)
* lo += hi >> 15; But faster using 16 bit registers. * lo += hi >> 15; But faster using 16 bit registers.
*/ */
hi <<= 1; hi <<= 1;
lo += (uint16_t)(hi >> 16); lo += (u16_t)(hi >> 16);
if ((int32_t)lo <= 0) /* Deal with rand_state == 0. */ if ((s32_t)lo <= 0) /* Deal with rand_state == 0. */
lo -= 0x7fffffff; lo -= 0x7fffffff;
rand_state = lo; rand_state = lo;
if (sizeof(int) == sizeof(int16_t)) if (sizeof(unsigned int) == sizeof(u16_t))
return (lo ^ (lo >> 16)) & RAND_MAX; /* Not ANSI C! */ return (lo ^ (lo >> 16)) & RAND_MAX; /* Not ANSI C! */
else else
return lo & RAND_MAX; return lo & RAND_MAX;

6
core/lib/rand.h
View file

@ -28,10 +28,10 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: rand.h,v 1.2 2007/07/03 13:26:15 bg- Exp $ * @(#)$Id: rand.h,v 1.3 2007/08/10 08:02:01 oliverschmidt Exp $
*/ */
/* -*- C -*- */ /* -*- C -*- */
/* @(#)$Id: rand.h,v 1.2 2007/07/03 13:26:15 bg- Exp $ */ /* @(#)$Id: rand.h,v 1.3 2007/08/10 08:02:01 oliverschmidt Exp $ */
#ifndef RAND_H #ifndef RAND_H
#define RAND_H #define RAND_H
@ -50,7 +50,7 @@
* Comm. of the ACM, V. 31. No. 10, pp 1192-1201 * Comm. of the ACM, V. 31. No. 10, pp 1192-1201
*/ */
extern int32_t rand_state; extern s32_t rand_state;
int rand(void); int rand(void);