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improved prng

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Luxferre
2023-08-10 09:11:43 +03:00
parent 5bd1524917
commit 9acabe0de8
2 changed files with 8 additions and 6 deletions
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README.md
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@@ -85,7 +85,7 @@ Name|Args|Implemented?|UTF-8 safe?|Meaning
- `sf`: store (raw) file. 3 arguments: `#(sf,fname,form)`. Stores the raw value from `form` into a named file. The value is always written in its entirety (the form pointer is ignored) and segment gap bytes, if there are any, are written "as is". Returns a null value. The form doesn't get deleted from the internal form storage. The file is fully overwritten if it already exists.
- `ff`: fetch (raw) file. 3 arguments: `#(ff,fname,form)`. Reads a raw string from the named file into `form`. Returns null value (check the target form afterwards).
- `tm`: local/UTC/Epoch time. 2 or 3 arguments: `#(tl,fmt[,U])`. Returns the local (or UTC, if the third parameter `U` is specified) time formatted according to the strftime-compatible `fmt` string or `E` format. If the format string is just `E` (Epoch), returns the amount of seconds since 00:00:00 UTC, January 1, 1970.
- `rn`: random number. 3 arguments: `#(rn,n1,n2)`. Returns a (pseudo-)random integer number in the range `n1` (included) to `n2` (not included). Implemented using the xorshift64 algorithm.
- `rn`: random number. 3 arguments: `#(rn,n1,n2)`. Returns a (pseudo-)random integer number in the range `n1` (included) to `n2` (not included). Implemented using the double-pass xorshift64* algorithm.
- `os`: run an OS command. 2 arguments: `#(os,cmd)`. Runs a command in the external OS shell (the one determined by the `system()` C call) and returns the command exit code. The output is not captured.
For self-contained nntrac environments that have no external shell (or the shell is nntrac itself), you can disable the `os` primitive by building nntrac with the `-DNNT_NO_EXTSHELL` flag.