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Implement strcmp()

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This commit is contained in:
avdgrinten 2015-12-08 13:19:36 +01:00
parent 41471488c7
commit 652bbbb582
1 changed files with 21 additions and 6 deletions
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27
libc/generic/ansi/src/string.cpp
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@ -41,19 +41,34 @@ char *strncat(char *__restrict dest, const char *__restrict src, size_t max_size
}
int memcmp(const void *a, const void *b, size_t size) {
char *a_bytes = (char *)a;
char *b_bytes = (char *)b;
for(size_t i = 0; i < size; i++) {
if(a_bytes[i] < b_bytes[i])
auto a_byte = static_cast<const unsigned char *>(a)[i];
auto b_byte = static_cast<const unsigned char *>(b)[i];
if(a_byte < b_byte)
return -1;
if(a_bytes[i] > b_bytes[i])
if(a_byte > b_byte)
return 1;
}
return 0;
}
int strcmp(const char *a, const char *b) {
__ensure(!"Not implemented");
__builtin_unreachable();
size_t i = 0;
while(true) {
unsigned char a_byte = a[i];
unsigned char b_byte = b[i];
if(!a_byte && !b_byte)
return 0;
if(!a_byte)
return -1;
if(!b_byte)
return -1;
if(a_byte < b_byte)
return -1;
if(a_byte > b_byte)
return 1;
i++;
}
}
int strcoll(const char *a, const char *b) {
__ensure(!"Not implemented");