diff options
| author | Lars Knoll <lars.knoll@nokia.com> | 2009-03-23 10:34:13 +0100 |
|---|---|---|
| committer | Simon Hausmann <simon.hausmann@nokia.com> | 2009-03-23 10:34:13 +0100 |
| commit | 67ad0519fd165acee4a4d2a94fa502e9e4847bd0 (patch) | |
| tree | 1dbf50b3dff8d5ca7e9344733968c72704eb15ff /src/3rdparty/ptmalloc/lran2.h | |
| download | qt4-tools-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.tar.gz | |
Long live Qt!
Diffstat (limited to 'src/3rdparty/ptmalloc/lran2.h')
| -rw-r--r-- | src/3rdparty/ptmalloc/lran2.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/3rdparty/ptmalloc/lran2.h b/src/3rdparty/ptmalloc/lran2.h new file mode 100644 index 0000000000..cea9920282 --- /dev/null +++ b/src/3rdparty/ptmalloc/lran2.h @@ -0,0 +1,51 @@ +/* lran2.h + * by Wolfram Gloger 1996. + * + * A small, portable pseudo-random number generator. + */ + +#ifndef _LRAN2_H +#define _LRAN2_H + +#define LRAN2_MAX 714025l /* constants for portable */ +#define IA 1366l /* random number generator */ +#define IC 150889l /* (see e.g. `Numerical Recipes') */ + +struct lran2_st { + long x, y, v[97]; +}; + +static void +lran2_init(struct lran2_st* d, long seed) +{ + long x; + int j; + + x = (IC - seed) % LRAN2_MAX; + if(x < 0) x = -x; + for(j=0; j<97; j++) { + x = (IA*x + IC) % LRAN2_MAX; + d->v[j] = x; + } + d->x = (IA*x + IC) % LRAN2_MAX; + d->y = d->x; +} + +#ifdef __GNUC__ +__inline__ +#endif +static long +lran2(struct lran2_st* d) +{ + int j = (d->y % 97); + + d->y = d->v[j]; + d->x = (IA*d->x + IC) % LRAN2_MAX; + d->v[j] = d->x; + return d->y; +} + +#undef IA +#undef IC + +#endif |