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LibC: Implement more functions to string.h

This commit is contained in:
Bananymous 2023-12-14 11:02:30 +02:00
parent a3de64f5fa
commit adf1e54605
1 changed files with 89 additions and 48 deletions
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137
libc/string.cpp
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@ -1,5 +1,6 @@
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int errno = 0;
@ -62,6 +63,16 @@ int strcmp(const char* s1, const char* s2)
return *u1 - *u2;
}
int strncmp(const char* s1, const char* s2, size_t n)
{
const unsigned char* u1 = (unsigned char*)s1;
const unsigned char* u2 = (unsigned char*)s2;
for (; --n && *u1 && *u2; u1++, u2++)
if (*u1 != *u2)
break;
return *u1 - *u2;
}
char* stpcpy(char* __restrict__ dest, const char* __restrict__ src)
{
size_t i = 0;
@ -106,6 +117,84 @@ char* strncat(char* __restrict__ dest, const char* __restrict__ src, size_t n)
return dest;
}
#ifndef __is_kernel
char* strdup(const char* str)
{
const size_t size = strlen(str) + 1;
char* new_str = (char*)malloc(size);
if (new_str == nullptr)
return nullptr;
memcpy(new_str, str, size);
return new_str;
}
char* strndup(const char* str, size_t size)
{
if (strlen(str) < size)
size = strlen(str);
size += 1;
char* new_str = (char*)malloc(size);
if (new_str == nullptr)
return nullptr;
memcpy(new_str, str, size);
return new_str;
}
#endif
size_t strlen(const char* str)
{
size_t len = 0;
while (str[len])
len++;
return len;
}
char* strchr(const char* str, int c)
{
while (*str)
{
if (*str == c)
return (char*)str;
str++;
}
return (*str == c) ? (char*)str : nullptr;
}
char* strchrnul(const char* str, int c)
{
while (*str)
{
if (*str == (char)c)
return (char*)str;
str++;
}
return (char*)str;
}
char* strrchr(const char* str, int c)
{
size_t len = strlen(str);
while (len > 0)
{
if (str[len] == (char)c)
return (char*)str + len;
len--;
}
return (*str == c) ? (char*)str : nullptr;
}
char* strstr(const char* haystack, const char* needle)
{
for (size_t i = 0; haystack[i]; i++)
if (memcmp(haystack + i, needle, strlen(needle)) == 0)
return (char*)haystack + i;
return NULL;
}
char* strerror(int error)
{
static char buffer[1024];
@ -303,51 +392,3 @@ const char* strerrordesc_np(int error)
errno = EINVAL;
return "Unknown error";
}
size_t strlen(const char* str)
{
size_t len = 0;
while (str[len])
len++;
return len;
}
int strncmp(const char* s1, const char* s2, size_t n)
{
const unsigned char* u1 = (unsigned char*)s1;
const unsigned char* u2 = (unsigned char*)s2;
for (; --n && *u1 && *u2; u1++, u2++)
if (*u1 != *u2)
break;
return *u1 - *u2;
}
char* strchr(const char* str, int c)
{
while (*str)
{
if (*str == c)
return (char*)str;
str++;
}
return (*str == c) ? (char*)str : nullptr;
}
char* strchrnul(const char* str, int c)
{
while (*str)
{
if (*str == c)
return (char*)str;
str++;
}
return (char*)str;
}
char* strstr(const char* haystack, const char* needle)
{
for (size_t i = 0; haystack[i]; i++)
if (memcmp(haystack + i, needle, strlen(needle)) == 0)
return (char*)haystack + i;
return NULL;
}