135 lines
1.6 KiB
C
135 lines
1.6 KiB
C
// String operations implementation for blankos/libc
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// Author: xamidev
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// Licensed under the Unlicense. See the repo below.
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// https://github.com/xamidev/blankos
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#include <stdint.h>
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#include "../kernel/system.h"
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int strlen(const char* str)
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{
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int len = 0;
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while (*str++)
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{
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len++;
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}
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return len;
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}
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int strcmp(const char* str1, const char* str2)
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{
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while (*str1 && (*str1 == *str2))
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{
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str1++;
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str2++;
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}
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return *(const unsigned char*)str1 - *(const unsigned char*)str2;
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}
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char* strchr(const char* str, int c)
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{
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while (*str)
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{
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if (*str == (char)c)
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{
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return (char*)str;
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}
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str++;
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}
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if (c == '\0')
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{
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return (char*)str;
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}
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return NULL;
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}
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char* strtok(char* str, const char* delimiter)
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{
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static char* last;
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if (str)
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{
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last = str;
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} else {
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str = last;
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}
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if (!str || *str == '\0')
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{
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return NULL;
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}
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char* token_start = str;
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while (*str && !strchr(delimiter, *str))
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{
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str++;
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}
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if (*str)
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{
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*str = '\0';
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last = str + 1;
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} else {
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last = NULL;
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}
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return token_start;
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}
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int atoi(char* str)
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{
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int result = 0;
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for (int i=0; str[i] != '\0'; i++)
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{
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result = result*10 + str[i] - '0';
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}
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return result;
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}
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void strcat(char* dest, const char* src)
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{
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while (*dest)
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{
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dest++;
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}
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while (*src)
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{
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*dest = *src;
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dest++;
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src++;
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}
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*dest = '\0';
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}
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size_t strnlen(const char* str, size_t max_len)
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{
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size_t len = 0;
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while (*str && len < max_len)
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{
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len++;
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str++;
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}
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return len;
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}
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void strncat(char* dest, const char* src, size_t n)
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{
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while (*dest)
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{
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dest++;
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}
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while (*src && n > 0)
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{
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*dest = *src;
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dest++;
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src++;
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n--;
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}
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*dest = '\0';
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}
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