banan-os/libc/strings.cpp

31 lines
702 B
C++

#include <ctype.h>
#include <strings.h>
int ffs(int i)
{
for (unsigned idx = 0; idx < sizeof(i) * 8; idx++)
if (i & (1 << idx))
return i + 1;
return 0;
}
int strcasecmp(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 (tolower(*u1) != tolower(*u2))
break;
return tolower(*u1) - tolower(*u2);
}
int strncasecmp(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 (tolower(*u1) != tolower(*u2))
break;
return tolower(*u1) - tolower(*u2);
}