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Add memcpy() and strcmp() to LibC.

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This commit is contained in:
Andreas Kling 2018-10-26 13:32:13 +02:00
parent 0af9254812
commit ac738b03d6
2 changed files with 19 additions and 0 deletions
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17
LibC/string.cpp
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@ -12,6 +12,23 @@ size_t strlen(const char* str)
return len;
}
int strcmp(const char* s1, const char* s2)
{
for (; *s1 == *s2; ++s1, ++s2) {
if (*s1 == 0)
return 0;
}
return *(const unsigned char*)s1 < *(const unsigned char*)s2 ? -1 : 1;
}
void memcpy(void* dest, const void* src, size_t n)
{
auto* bdest = (unsigned char*)dest;
auto* bsrc = (const unsigned char*)src;
for (; n; --n)
*(bdest++) = *(bsrc++);
}
const char* strerror(int errnum)
{
switch (errnum) {

2
LibC/string.h
View file

@ -5,6 +5,8 @@
extern "C" {
size_t strlen(const char*);
int strcmp(const char*, const char*);
void memcpy(void*, const void*, size_t);
const char* strerror(int errnum);
}