From: Ron Koenderink Date: Sun, 21 Oct 2007 15:34:27 +0000 (+0000) Subject: (random, srandom) [_WIN32]: Provide random and srandom X-Git-Tag: v4.3.11~164 X-Git-Url: http://git.pond.sub.org/?p=empserver;a=commitdiff_plain;h=c115ed13275b3d30904b520d0d7b0fb1b15bd101 (random, srandom) [_WIN32]: Provide random and srandom POSIX equivalents instead of using the WIN32 rand/srand functions. The files were derived from GNU libc source. (empth_threadMain) [_WIN32]: Remove the srandom() as the POSIX equivalent are not thread specific as the WIN32 functions were. --- diff --git a/src/lib/empthread/ntthread.c b/src/lib/empthread/ntthread.c index 06c55b284..e7e70436c 100644 --- a/src/lib/empthread/ntthread.c +++ b/src/lib/empthread/ntthread.c @@ -326,8 +326,6 @@ loc_Exit_Handler(DWORD fdwCtrlType) static void empth_threadMain(void *pvData) { - time_t now; - empth_t *pThread = pvData; /* Out of here... */ @@ -343,13 +341,6 @@ empth_threadMain(void *pvData) /* Signal that the thread has started. */ SetEvent(hThreadStartEvent); - /* - * seed the rand() function - * In WIN32, each thread has seed - */ - time(&now); - srandom(now ^ (unsigned)pThread); - /* Switch to this thread context */ loc_RunThisThread(NULL); diff --git a/src/lib/w32/random.c b/src/lib/w32/random.c new file mode 100644 index 000000000..4be50b5c4 --- /dev/null +++ b/src/lib/w32/random.c @@ -0,0 +1,314 @@ +/* + * Ported from GNU libc to Windows by Ron Koenderink, 2007 + */ + +/* Copyright (C) 1995 Free Software Foundation + + The GNU C 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. + + The GNU C 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 the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* + * This is derived from the Berkeley source: + * @(#)random.c 5.5 (Berkeley) 7/6/88 + * It was reworked for the GNU C Library by Roland McGrath. + * Rewritten to use reentrant functions by Ulrich Drepper, 1995. + */ + +/* + Copyright (C) 1983 Regents of the University of California. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + 4. Neither the name of the University nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + SUCH DAMAGE.*/ + +/* + * Not available for empire use random.h + * +#include +#include +#include +#include + */ +#include "random.h" +#include "w32misc.h" + + +/* An improved random number generation package. In addition to the standard + rand()/srand() like interface, this package also has a special state info + interface. The initstate() routine is called with a seed, an array of + bytes, and a count of how many bytes are being passed in; this array is + then initialized to contain information for random number generation with + that much state information. Good sizes for the amount of state + information are 32, 64, 128, and 256 bytes. The state can be switched by + calling the setstate() function with the same array as was initialized + with initstate(). By default, the package runs with 128 bytes of state + information and generates far better random numbers than a linear + congruential generator. If the amount of state information is less than + 32 bytes, a simple linear congruential R.N.G. is used. Internally, the + state information is treated as an array of longs; the zeroth element of + the array is the type of R.N.G. being used (small integer); the remainder + of the array is the state information for the R.N.G. Thus, 32 bytes of + state information will give 7 longs worth of state information, which will + allow a degree seven polynomial. (Note: The zeroth word of state + information also has some other information stored in it; see setstate + for details). The random number generation technique is a linear feedback + shift register approach, employing trinomials (since there are fewer terms + to sum up that way). In this approach, the least significant bit of all + the numbers in the state table will act as a linear feedback shift register, + and will have period 2^deg - 1 (where deg is the degree of the polynomial + being used, assuming that the polynomial is irreducible and primitive). + The higher order bits will have longer periods, since their values are + also influenced by pseudo-random carries out of the lower bits. The + total period of the generator is approximately deg*(2**deg - 1); thus + doubling the amount of state information has a vast influence on the + period of the generator. Note: The deg*(2**deg - 1) is an approximation + only good for large deg, when the period of the shift register is the + dominant factor. With deg equal to seven, the period is actually much + longer than the 7*(2**7 - 1) predicted by this formula. */ + + + +/* For each of the currently supported random number generators, we have a + break value on the amount of state information (you need at least this many + bytes of state info to support this random number generator), a degree for + the polynomial (actually a trinomial) that the R.N.G. is based on, and + separation between the two lower order coefficients of the trinomial. */ + +/* Linear congruential. */ +#define TYPE_0 0 +#define BREAK_0 8 +#define DEG_0 0 +#define SEP_0 0 + +/* x**7 + x**3 + 1. */ +#define TYPE_1 1 +#define BREAK_1 32 +#define DEG_1 7 +#define SEP_1 3 + +/* x**15 + x + 1. */ +#define TYPE_2 2 +#define BREAK_2 64 +#define DEG_2 15 +#define SEP_2 1 + +/* x**31 + x**3 + 1. */ +#define TYPE_3 3 +#define BREAK_3 128 +#define DEG_3 31 +#define SEP_3 3 + +/* x**63 + x + 1. */ +#define TYPE_4 4 +#define BREAK_4 256 +#define DEG_4 63 +#define SEP_4 1 + + +/* Array versions of the above information to make code run faster. + Relies on fact that TYPE_i == i. */ + +#define MAX_TYPES 5 /* Max number of types above. */ + + +/* Initially, everything is set up as if from: + initstate(1, randtbl, 128); + Note that this initialization takes advantage of the fact that srandom + advances the front and rear pointers 10*rand_deg times, and hence the + rear pointer which starts at 0 will also end up at zero; thus the zeroth + element of the state information, which contains info about the current + position of the rear pointer is just + (MAX_TYPES * (rptr - state)) + TYPE_3 == TYPE_3. */ + +static int32_t randtbl[DEG_3 + 1] = + { + TYPE_3, + + -1726662223, 379960547, 1735697613, 1040273694, 1313901226, + 1627687941, -179304937, -2073333483, 1780058412, -1989503057, + -615974602, 344556628, 939512070, -1249116260, 1507946756, + -812545463, 154635395, 1388815473, -1926676823, 525320961, + -1009028674, 968117788, -123449607, 1284210865, 435012392, + -2017506339, -911064859, -370259173, 1132637927, 1398500161, + -205601318, + }; + + +static struct random_data unsafe_state = + { +/* FPTR and RPTR are two pointers into the state info, a front and a rear + pointer. These two pointers are always rand_sep places aparts, as they + cycle through the state information. (Yes, this does mean we could get + away with just one pointer, but the code for random is more efficient + this way). The pointers are left positioned as they would be from the call: + initstate(1, randtbl, 128); + (The position of the rear pointer, rptr, is really 0 (as explained above + in the initialization of randtbl) because the state table pointer is set + to point to randtbl[1] (as explained below).) */ + +/* .fptr =*/ &randtbl[SEP_3 + 1], +/* .rptr =*/ &randtbl[1], +/* The following things are the pointer to the state information table, + the type of the current generator, the degree of the current polynomial + being used, and the separation between the two pointers. + Note that for efficiency of random, we remember the first location of + the state information, not the zeroth. Hence it is valid to access + state[-1], which is used to store the type of the R.N.G. + Also, we remember the last location, since this is more efficient than + indexing every time to find the address of the last element to see if + the front and rear pointers have wrapped. */ + +/* .state =*/ &randtbl[1], + +/* .rand_type =*/ TYPE_3, +/* .rand_deg =*/ DEG_3, +/* .rand_sep =*/ SEP_3, + +/* .end_ptr =*/ &randtbl[sizeof (randtbl) / sizeof (randtbl[0])] +}; + +/* POSIX.1c requires that there is mutual exclusion for the `rand' and + `srand' functions to prevent concurrent calls from modifying common + data. */ +__libc_lock_define_initialized (static1, lock) + +/* Initialize the random number generator based on the given seed. If the + type is the trivial no-state-information type, just remember the seed. + Otherwise, initializes state[] based on the given "seed" via a linear + congruential generator. Then, the pointers are set to known locations + that are exactly rand_sep places apart. Lastly, it cycles the state + information a given number of times to get rid of any initial dependencies + introduced by the L.C.R.N.G. Note that the initialization of randtbl[] + for default usage relies on values produced by this routine. */ +void +__srandom (x) + unsigned int x; +{ + __libc_lock_lock (lock); + (void) __srandom_r (x, &unsafe_state); + __libc_lock_unlock (lock); +} + +weak_alias (__srandom, srandom) +weak_alias (__srandom, srand) + +/* Initialize the state information in the given array of N bytes for + future random number generation. Based on the number of bytes we + are given, and the break values for the different R.N.G.'s, we choose + the best (largest) one we can and set things up for it. srandom is + then called to initialize the state information. Note that on return + from srandom, we set state[-1] to be the type multiplexed with the current + value of the rear pointer; this is so successive calls to initstate won't + lose this information and will be able to restart with setstate. + Note: The first thing we do is save the current state, if any, just like + setstate so that it doesn't matter when initstate is called. + Returns a pointer to the old state. */ +char * +__initstate (seed, arg_state, n) + unsigned int seed; + char *arg_state; + size_t n; +{ + int32_t *ostate; + + __libc_lock_lock (lock); + + ostate = &unsafe_state.state[-1]; + + __initstate_r (seed, arg_state, n, &unsafe_state); + + __libc_lock_unlock (lock); + + return (char *) ostate; +} + +weak_alias (__initstate, initstate) + +/* Restore the state from the given state array. + Note: It is important that we also remember the locations of the pointers + in the current state information, and restore the locations of the pointers + from the old state information. This is done by multiplexing the pointer + location into the zeroth word of the state information. Note that due + to the order in which things are done, it is OK to call setstate with the + same state as the current state + Returns a pointer to the old state information. */ +char * +__setstate (arg_state) + char *arg_state; +{ + int32_t *ostate; + + __libc_lock_lock (lock); + + ostate = &unsafe_state.state[-1]; + + if (__setstate_r (arg_state, &unsafe_state) < 0) + ostate = NULL; + + __libc_lock_unlock (lock); + + return (char *) ostate; +} + +weak_alias (__setstate, setstate) + +/* If we are using the trivial TYPE_0 R.N.G., just do the old linear + congruential bit. Otherwise, we do our fancy trinomial stuff, which is the + same in all the other cases due to all the global variables that have been + set up. The basic operation is to add the number at the rear pointer into + the one at the front pointer. Then both pointers are advanced to the next + location cyclically in the table. The value returned is the sum generated, + reduced to 31 bits by throwing away the "least random" low bit. + Note: The code takes advantage of the fact that both the front and + rear pointers can't wrap on the same call by not testing the rear + pointer if the front one has wrapped. Returns a 31-bit random number. */ + +long int +__random () +{ + int32_t retval; + + __libc_lock_lock (lock); + + (void) __random_r (&unsafe_state, &retval); + + __libc_lock_unlock (lock); + + return retval; +} + +weak_alias (__random, random) diff --git a/src/lib/w32/random.h b/src/lib/w32/random.h new file mode 100644 index 000000000..8fe9aa74c --- /dev/null +++ b/src/lib/w32/random.h @@ -0,0 +1,41 @@ +#include + +typedef int int32_t; +//#define int32_t int +#define NULL ((void *)0) +struct random_data +{ + int32_t *fptr; /* Front pointer. */ + int32_t *rptr; /* Rear pointer. */ + int32_t *state; /* Array of state values. */ + int rand_type; /* Type of random number generator. */ + int rand_deg; /* Degree of random number generator. */ + int rand_sep; /* Distance between front and rear. */ + int32_t *end_ptr; /* Pointer behind state table. */ +}; + +/* + * Not required as the empire scheduler ensure only + * one thread is active at a time + */ +#define __libc_lock_lock(lock) +#define __libc_lock_unlock(lock) +#define __libc_lock_define_initialized(static1, lock) + +#define __set_errno(error) _set_errno((error)) + +#define weak_alias(arg1, arg2) +#define srandom_r(seed, buf) __srandom_r((seed), (buf)) +#define random_r(buf, result) __random_r((buf), (result)) +#define initstate_r(seed, state, size, buf) \ + __initstate_r((seed), (state), (size), (buf)) +#define setstate_r(state, buf) __setstate_r((state), (buf)) + +extern int __random_r (struct random_data *__restrict __buf, + int32_t *__restrict __result); +extern int __srandom_r (unsigned int __seed, struct random_data *__buf); +extern int __initstate_r (unsigned int __seed, char *__restrict __statebuf, + size_t __statelen, + struct random_data *__restrict __buf); +extern int __setstate_r (char *__restrict __statebuf, + struct random_data *__restrict __buf); diff --git a/src/lib/w32/random_r.c b/src/lib/w32/random_r.c new file mode 100644 index 000000000..fc238a2e4 --- /dev/null +++ b/src/lib/w32/random_r.c @@ -0,0 +1,422 @@ +/* + * Ported from GNU libc to Windows by Ron Koenderink, 2007 + */ + +/* + Copyright (C) 1995, 2005 Free Software Foundation + + The GNU C 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. + + The GNU C 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 the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* + Copyright (C) 1983 Regents of the University of California. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + 4. Neither the name of the University nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + SUCH DAMAGE.*/ + +/* + * This is derived from the Berkeley source: + * @(#)random.c 5.5 (Berkeley) 7/6/88 + * It was reworked for the GNU C Library by Roland McGrath. + * Rewritten to be reentrant by Ulrich Drepper, 1995 + */ + +//#include +//#include +//#include +#include "random.h" +#include + +/* An improved random number generation package. In addition to the standard + rand()/srand() like interface, this package also has a special state info + interface. The initstate() routine is called with a seed, an array of + bytes, and a count of how many bytes are being passed in; this array is + then initialized to contain information for random number generation with + that much state information. Good sizes for the amount of state + information are 32, 64, 128, and 256 bytes. The state can be switched by + calling the setstate() function with the same array as was initialized + with initstate(). By default, the package runs with 128 bytes of state + information and generates far better random numbers than a linear + congruential generator. If the amount of state information is less than + 32 bytes, a simple linear congruential R.N.G. is used. Internally, the + state information is treated as an array of longs; the zeroth element of + the array is the type of R.N.G. being used (small integer); the remainder + of the array is the state information for the R.N.G. Thus, 32 bytes of + state information will give 7 longs worth of state information, which will + allow a degree seven polynomial. (Note: The zeroth word of state + information also has some other information stored in it; see setstate + for details). The random number generation technique is a linear feedback + shift register approach, employing trinomials (since there are fewer terms + to sum up that way). In this approach, the least significant bit of all + the numbers in the state table will act as a linear feedback shift register, + and will have period 2^deg - 1 (where deg is the degree of the polynomial + being used, assuming that the polynomial is irreducible and primitive). + The higher order bits will have longer periods, since their values are + also influenced by pseudo-random carries out of the lower bits. The + total period of the generator is approximately deg*(2**deg - 1); thus + doubling the amount of state information has a vast influence on the + period of the generator. Note: The deg*(2**deg - 1) is an approximation + only good for large deg, when the period of the shift register is the + dominant factor. With deg equal to seven, the period is actually much + longer than the 7*(2**7 - 1) predicted by this formula. */ + + + +/* For each of the currently supported random number generators, we have a + break value on the amount of state information (you need at least this many + bytes of state info to support this random number generator), a degree for + the polynomial (actually a trinomial) that the R.N.G. is based on, and + separation between the two lower order coefficients of the trinomial. */ + +/* Linear congruential. */ +#define TYPE_0 0 +#define BREAK_0 8 +#define DEG_0 0 +#define SEP_0 0 + +/* x**7 + x**3 + 1. */ +#define TYPE_1 1 +#define BREAK_1 32 +#define DEG_1 7 +#define SEP_1 3 + +/* x**15 + x + 1. */ +#define TYPE_2 2 +#define BREAK_2 64 +#define DEG_2 15 +#define SEP_2 1 + +/* x**31 + x**3 + 1. */ +#define TYPE_3 3 +#define BREAK_3 128 +#define DEG_3 31 +#define SEP_3 3 + +/* x**63 + x + 1. */ +#define TYPE_4 4 +#define BREAK_4 256 +#define DEG_4 63 +#define SEP_4 1 + + +/* Array versions of the above information to make code run faster. + Relies on fact that TYPE_i == i. */ + +#define MAX_TYPES 5 /* Max number of types above. */ + +struct random_poly_info +{ + int seps[MAX_TYPES]; + int degrees[MAX_TYPES]; +}; + +static const struct random_poly_info random_poly_info = +{ + { SEP_0, SEP_1, SEP_2, SEP_3, SEP_4 }, + { DEG_0, DEG_1, DEG_2, DEG_3, DEG_4 } +}; + + + + +/* Initialize the random number generator based on the given seed. If the + type is the trivial no-state-information type, just remember the seed. + Otherwise, initializes state[] based on the given "seed" via a linear + congruential generator. Then, the pointers are set to known locations + that are exactly rand_sep places apart. Lastly, it cycles the state + information a given number of times to get rid of any initial dependencies + introduced by the L.C.R.N.G. Note that the initialization of randtbl[] + for default usage relies on values produced by this routine. */ +int +__srandom_r (seed, buf) + unsigned int seed; + struct random_data *buf; +{ + int type; + int32_t *state; + long int i; + long int word; + int32_t *dst; + int kc; + + if (buf == NULL) + goto fail; + type = buf->rand_type; + if ((unsigned int) type >= MAX_TYPES) + goto fail; + + state = buf->state; + /* We must make sure the seed is not 0. Take arbitrarily 1 in this case. */ + if (seed == 0) + seed = 1; + state[0] = seed; + if (type == TYPE_0) + goto done; + + dst = state; + word = seed; + kc = buf->rand_deg; + for (i = 1; i < kc; ++i) + { + /* This does: + state[i] = (16807 * state[i - 1]) % 2147483647; + but avoids overflowing 31 bits. */ + long int hi = word / 127773; + long int lo = word % 127773; + word = 16807 * lo - 2836 * hi; + if (word < 0) + word += 2147483647; + *++dst = word; + } + + buf->fptr = &state[buf->rand_sep]; + buf->rptr = &state[0]; + kc *= 10; + while (--kc >= 0) + { + int32_t discard; + (void) __random_r (buf, &discard); + } + + done: + return 0; + + fail: + return -1; +} + +weak_alias (__srandom_r, srandom_r) + +/* Initialize the state information in the given array of N bytes for + future random number generation. Based on the number of bytes we + are given, and the break values for the different R.N.G.'s, we choose + the best (largest) one we can and set things up for it. srandom is + then called to initialize the state information. Note that on return + from srandom, we set state[-1] to be the type multiplexed with the current + value of the rear pointer; this is so successive calls to initstate won't + lose this information and will be able to restart with setstate. + Note: The first thing we do is save the current state, if any, just like + setstate so that it doesn't matter when initstate is called. + Returns a pointer to the old state. */ +int +__initstate_r (seed, arg_state, n, buf) + unsigned int seed; + char *arg_state; + size_t n; + struct random_data *buf; +{ + int32_t *old_state; + int type; + int degree; + int separation; + int32_t *state; + + if (buf == NULL) + goto fail; + + old_state = buf->state; + if (old_state != NULL) + { + int old_type = buf->rand_type; + if (old_type == TYPE_0) + old_state[-1] = TYPE_0; + else + old_state[-1] = (MAX_TYPES * (buf->rptr - old_state)) + old_type; + } + + if (n >= BREAK_3) + type = n < BREAK_4 ? TYPE_3 : TYPE_4; + else if (n < BREAK_1) + { + if (n < BREAK_0) + { + __set_errno (EINVAL); + goto fail; + } + type = TYPE_0; + } + else + type = n < BREAK_2 ? TYPE_1 : TYPE_2; + + degree = random_poly_info.degrees[type]; + separation = random_poly_info.seps[type]; + + buf->rand_type = type; + buf->rand_sep = separation; + buf->rand_deg = degree; + state = &((int32_t *) arg_state)[1]; /* First location. */ + /* Must set END_PTR before srandom. */ + buf->end_ptr = &state[degree]; + + buf->state = state; + + __srandom_r (seed, buf); + + state[-1] = TYPE_0; + if (type != TYPE_0) + state[-1] = (buf->rptr - state) * MAX_TYPES + type; + + return 0; + + fail: + __set_errno (EINVAL); + return -1; +} + +weak_alias (__initstate_r, initstate_r) + +/* Restore the state from the given state array. + Note: It is important that we also remember the locations of the pointers + in the current state information, and restore the locations of the pointers + from the old state information. This is done by multiplexing the pointer + location into the zeroth word of the state information. Note that due + to the order in which things are done, it is OK to call setstate with the + same state as the current state + Returns a pointer to the old state information. */ +int +__setstate_r (arg_state, buf) + char *arg_state; + struct random_data *buf; +{ + int32_t *new_state = 1 + (int32_t *) arg_state; + int type; + int old_type; + int32_t *old_state; + int degree; + int separation; + + if (arg_state == NULL || buf == NULL) + goto fail; + + old_type = buf->rand_type; + old_state = buf->state; + if (old_type == TYPE_0) + old_state[-1] = TYPE_0; + else + old_state[-1] = (MAX_TYPES * (buf->rptr - old_state)) + old_type; + + type = new_state[-1] % MAX_TYPES; + if (type < TYPE_0 || type > TYPE_4) + goto fail; + + buf->rand_deg = degree = random_poly_info.degrees[type]; + buf->rand_sep = separation = random_poly_info.seps[type]; + buf->rand_type = type; + + if (type != TYPE_0) + { + int rear = new_state[-1] / MAX_TYPES; + buf->rptr = &new_state[rear]; + buf->fptr = &new_state[(rear + separation) % degree]; + } + buf->state = new_state; + /* Set end_ptr too. */ + buf->end_ptr = &new_state[degree]; + + return 0; + + fail: + __set_errno (EINVAL); + return -1; +} + +weak_alias (__setstate_r, setstate_r) + +/* If we are using the trivial TYPE_0 R.N.G., just do the old linear + congruential bit. Otherwise, we do our fancy trinomial stuff, which is the + same in all the other cases due to all the global variables that have been + set up. The basic operation is to add the number at the rear pointer into + the one at the front pointer. Then both pointers are advanced to the next + location cyclically in the table. The value returned is the sum generated, + reduced to 31 bits by throwing away the "least random" low bit. + Note: The code takes advantage of the fact that both the front and + rear pointers can't wrap on the same call by not testing the rear + pointer if the front one has wrapped. Returns a 31-bit random number. */ + +int +__random_r (buf, result) + struct random_data *buf; + int32_t *result; +{ + int32_t *state; + + if (buf == NULL || result == NULL) + goto fail; + + state = buf->state; + + if (buf->rand_type == TYPE_0) + { + int32_t val = state[0]; + val = ((state[0] * 1103515245) + 12345) & 0x7fffffff; + state[0] = val; + *result = val; + } + else + { + int32_t *fptr = buf->fptr; + int32_t *rptr = buf->rptr; + int32_t *end_ptr = buf->end_ptr; + int32_t val; + + val = *fptr += *rptr; + /* Chucking least random bit. */ + *result = (val >> 1) & 0x7fffffff; + ++fptr; + if (fptr >= end_ptr) + { + fptr = state; + ++rptr; + } + else + { + ++rptr; + if (rptr >= end_ptr) + rptr = state; + } + buf->fptr = fptr; + buf->rptr = rptr; + } + return 0; + + fail: + __set_errno (EINVAL); + return -1; +} + +weak_alias (__random_r, random_r) diff --git a/src/lib/w32/w32misc.h b/src/lib/w32/w32misc.h index cc2a545ce..0942ba40d 100644 --- a/src/lib/w32/w32misc.h +++ b/src/lib/w32/w32misc.h @@ -49,8 +49,17 @@ #undef fileno /* stdlib.h */ -#define random rand -#define srandom srand +#include +#define initstate(seed, state, size) \ + __initstate((seed), (state), (size)) +#define setstate(state) __setstate((state)) +#define srandom(seed) __srandom((seed)) +#define random() __random() + +extern char *__initstate(unsigned seed, char *state, size_t size); +extern long __random(void); +extern char *__setstate(const char *state); +extern void __srandom(unsigned seed); /* sys/types.h */ typedef unsigned short mode_t;