diff options
| -rw-r--r-- | lib/libc/include/stdlib.h | 3 | ||||
| -rw-r--r-- | lib/libc/src/stdlib/rand.c | 45 |
2 files changed, 48 insertions, 0 deletions
diff --git a/lib/libc/include/stdlib.h b/lib/libc/include/stdlib.h index 054bdca..b79397d 100644 --- a/lib/libc/include/stdlib.h +++ b/lib/libc/include/stdlib.h @@ -85,6 +85,9 @@ __dead void _Exit(int status); #endif #endif +void srand(unsigned int r); +int rand(void); + __END_DECLS #endif /* !_STDLIB_H */ diff --git a/lib/libc/src/stdlib/rand.c b/lib/libc/src/stdlib/rand.c new file mode 100644 index 0000000..838ba5f --- /dev/null +++ b/lib/libc/src/stdlib/rand.c @@ -0,0 +1,45 @@ +/* + * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team. + * 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. + * 3. Neither the name of Hyra 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. + */ + +#include <stdlib.h> + +static unsigned int r_seed = 0x9E3779B9; + +void +srand(unsigned int r) +{ + r_seed = r; +} + +int +rand(void) +{ + r_seed = (r_seed >> 0x01U) ^ (-(r_seed & 0x01U) & 0xB400U); + return r_seed; +} |