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LibC: Add strcmp and strncmp

This commit is contained in:
Bananymous 2023-02-23 15:57:33 +02:00
parent 390a747768
commit 5cd97e44e2
4 changed files with 27 additions and 0 deletions
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2
libc/Makefile
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@ -40,6 +40,8 @@ string/memcmp.o \
string/memcpy.o \ string/memcpy.o \
string/memmove.o \ string/memmove.o \
string/memset.o \ string/memset.o \
string/strcmp.o \
string/strncmp.o \
string/strcpy.o \ string/strcpy.o \
string/strlen.o \ string/strlen.o \
string/strncpy.o \ string/strncpy.o \

3
libc/include/string.h
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@ -11,6 +11,9 @@ void* memmove(void*, const void*, size_t);
void* memset(void*, int, size_t); void* memset(void*, int, size_t);
size_t strlen(const char*); size_t strlen(const char*);
int strcmp(const char*, const char*);
int strncmp(const char*, const char*, size_t);
char* strcpy(char* __restrict, const char* __restrict); char* strcpy(char* __restrict, const char* __restrict);
char* strncpy(char* __restrict, const char* __restrict, size_t); char* strncpy(char* __restrict, const char* __restrict, size_t);

11
libc/string/strcmp.cpp Normal file
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@ -0,0 +1,11 @@
#include <string.h>
int strcmp(const char* s1, const char* s2)
{
const unsigned char* u1 = (unsigned char*)s1;
const unsigned char* u2 = (unsigned char*)s2;
for (; *u1 && *u2; u1++, u2++)
if (*u1 != *u2)
break;
return *u1 - *u2;
}

11
libc/string/strncmp.cpp Normal file
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@ -0,0 +1,11 @@
#include <string.h>
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;
}