95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* asbestOS: The best operating system ever made.
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* Copyright (C) 2017 Max Wash
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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static unsigned int random_seed = 53455346;
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int isupper(int c) { return (c >= 65 && c <= 90); }
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int islower(int c) { return (c >= 97 && c <= 122); }
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int toupper(int c) {
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if (!islower(c)) {
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return c;
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}
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return c - 32;
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}
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int tolower(int c) {
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if (!isupper(c)) {
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return c;
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}
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return c + 32;
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}
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int isdigit(int c) { return (c >= 48 && c <= 57); }
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int isalpha(int c) { return (c >= 65 && c <= 90) || (c >= 97 && c <= 122); }
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int isalnum(int c) { return isalpha(c) | isdigit(c); }
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int iscntrl(int c) { return (c <= 31) || (c == 127); }
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int isprint(int c) { return (c >= 32 && c <= 126) || (c >= 128 && c <= 254); }
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int isgraph(int c) { return isprint(c) && c != 32; }
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int ispunct(int c) { return isgraph(c) && !isalnum(c); }
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int isspace(int c) {
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return (c == ' ') || (c == '\t') || (c == '\n') || (c == '\v') ||
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(c == '\f') || (c == '\r');
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}
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int isxdigit(int c) {
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return isdigit(c) || (c >= 65 && c <= 70) || (c >= 97 && c <= 102);
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}
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bool fill_random(unsigned char *buffer, unsigned int size) {
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if (!buffer || !size) {
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return false;
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}
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for (uint32_t i = 0; i < size; i++) {
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uint32_t next = random_seed;
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uint32_t result;
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next *= 1103515245;
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next += 12345;
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result = (uint32_t)(next / 65536) % 2048;
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next *= 1103515245;
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next += 12345;
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result <<= 10;
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result ^= (uint32_t)(next / 65536) % 1024;
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next *= 1103515245;
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next += 12345;
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result <<= 10;
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result ^= (uint32_t)(next / 65536) % 1024;
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random_seed = next;
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buffer[i] = (uint8_t)(result % 256);
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}
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return true;
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}
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