https://perl5.git.perl.org / metaconfig.git / blame
| Commit | Line | Data |
|---|---|---|
| d8875586 MBT |
1 | ?RCS: $Id: randbits.U 1 2006-08-24 12:32:52Z rmanfredi $ |
| 2 | ?RCS: | |
| 3 | ?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi | |
| 4 | ?RCS: | |
| 5 | ?RCS: You may redistribute only under the terms of the Artistic Licence, | |
| 6 | ?RCS: as specified in the README file that comes with the distribution. | |
| 7 | ?RCS: You may reuse parts of this distribution only within the terms of | |
| 8 | ?RCS: that same Artistic Licence; a copy of which may be found at the root | |
| 9 | ?RCS: of the source tree for dist 4.0. | |
| 10 | ?RCS: | |
| 11 | ?RCS: $Log: randbits.U,v $ | |
| 12 | ?RCS: Revision 3.0.1.1 1997/02/28 16:19:29 ram | |
| 13 | ?RCS: patch61: added <unistd.h> and <stdlib.h> to the C program test | |
| 14 | ?RCS: | |
| 15 | ?RCS: Revision 3.0 1993/08/18 12:09:38 ram | |
| 16 | ?RCS: Baseline for dist 3.0 netwide release. | |
| 17 | ?RCS: | |
| 18 | ?X: | |
| 19 | ?X: This unit has been somewhat made obsolete with creation of the | |
| 20 | ?X: randfunc function (which finds out how to generate random | |
| 21 | ?X: numbers between 0 and 1. | |
| 22 | ?X: | |
| 23 | ?MAKE:randbits: cat rm Myread cc i_unistd i_stdlib | |
| 24 | ?MAKE: -pick add $@ %< | |
| 25 | ?S:randbits: | |
| 26 | ?S: This variable contains the eventual value of the RANDBITS symbol, | |
| 27 | ?S: which indicates to the C program how many bits of random number | |
| 28 | ?S: the rand() function produces. | |
| 29 | ?S:. | |
| 30 | ?C:RANDBITS: | |
| 31 | ?C: This symbol contains the number of bits of random number the rand() | |
| 32 | ?C: function produces. Usual values are 15, 16, and 31. | |
| 33 | ?C:. | |
| 34 | ?H:#define RANDBITS $randbits /**/ | |
| 35 | ?H:. | |
| 36 | : check for size of random number generator | |
| 37 | echo " " | |
| 38 | case "$randbits" in | |
| 39 | '') | |
| 40 | echo "Checking to see how many bits your rand function produces..." >&4 | |
| 41 | $cat >try.c <<EOCP | |
| 42 | #$i_unistd I_UNISTD | |
| 43 | #$i_stdlib I_STDLIB | |
| 44 | #include <stdio.h> | |
| 45 | #ifdef I_UNISTD | |
| 46 | # include <unistd.h> | |
| 47 | #endif | |
| 48 | #ifdef I_STDLIB | |
| 49 | # include <stdlib.h> | |
| 50 | #endif | |
| 51 | EOCP | |
| 52 | $cat >>try.c <<'EOCP' | |
| 53 | int main() | |
| 54 | { | |
| 55 | register int i; | |
| 56 | register unsigned long tmp; | |
| 57 | register unsigned long max = 0L; | |
| 58 | ||
| 59 | for (i = 1000; i; i--) { | |
| 60 | tmp = (unsigned long)rand(); | |
| 61 | if (tmp > max) max = tmp; | |
| 62 | } | |
| 63 | for (i = 0; max; i++) | |
| 64 | max /= 2; | |
| 65 | printf("%d\n",i); | |
| 66 | } | |
| 67 | EOCP | |
| 68 | if $cc -o try try.c >/dev/null 2>&1 ; then | |
| 69 | dflt=`try` | |
| 70 | else | |
| 71 | dflt='?' | |
| 72 | echo "(I can't seem to compile the test program...)" | |
| 73 | fi | |
| 74 | ;; | |
| 75 | *) | |
| 76 | dflt="$randbits" | |
| 77 | ;; | |
| 78 | esac | |
| 79 | rp='How many bits does your rand() function produce?' | |
| 80 | . ./myread | |
| 81 | randbits="$ans" | |
| 82 | $rm -f try.c try | |
| 83 |