forked from PoliEcho-holding-org/kern
Tom-on
90ac82eebc
Moved all header files into include/ and removed their C counterparts -> code inside .h files Also added a kernel.ld linker file since we don't have many code files in src/ now, i removed src/kernel/ only real code change is that i moved memcopy() and memset() into string.h from system.h
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
#ifndef STRING_H
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#define STRING_H
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#include "stdint.h"
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// Source: http://www.strudel.org.uk/itoa/
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char* itoa(uint32_t val, uint8_t base) {
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static char buf[32] = { 0 };
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if (base == 0 || base > 16) {
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// TODO: Add errors!!
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return buf;
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}
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int i = 30;
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for (; val && i; i--, val /= base) {
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buf[i] = "0123456789abcdef"[val % base];
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}
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return &buf[i + 1];
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}
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uint32_t atoi(const char* str) {
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uint32_t res = 0;
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// TODO: Add error checking
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while (*str >= '0' && *str <= '9') {
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res = res * 10 + (*str++ - '0');
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}
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return res;
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}
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int isSpace(char c) {
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if (c == ' ' || c == '\t' || c == '\n') return 1;
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else return 0;
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}
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// Some implementations taken from https://en.wikibooks.org/wiki/C_Programming/String_manipulation
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char* strcpy(char* str1, const char* str2) {
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char* dst = str1;
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const char* src = str2;
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while ((*dst++ = *src++) != '\0');
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return str1;
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}
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char* strcat(char* str1, const char* str2) {
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char* s = str1;
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while (*s != '\0') { s++; }
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strcpy(s, str2);
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return str1;
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}
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char* strchr(const char* str, char c) {
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const char* s = str;
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while (*s != '\0' && *s != c) { s++; }
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return (*s == c) ? (char*)s : NULL;
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}
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int strcmp(const char* str1, const char* str2) {
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while (*str1 != '\0' && *str1 == *str2) {
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str1++;
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str2++;
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}
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uint8_t c1 = (*(uint8_t*)str1);
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uint8_t c2 = (*(uint8_t*)str2);
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return ((c1 < c2) ? -1 : (c1 > c2));
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}
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uint32_t strlen(const char* str) {
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const char* p = str;
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while (*++p != '\0');
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return (uint32_t)(p - str);
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}
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// Memory functions
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char* memcopy(char* src, char* dst, uint16_t length) {
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for (int i = 0; i < length; i++) {
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*(dst + i) = *(src + i);
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}
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return dst;
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}
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char* memset(char* dst, char value, uint16_t length) {
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for (int i = 0; i < length; i++) {
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*(dst + i) = value;
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}
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return dst;
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}
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#endif
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