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#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include "syscall.h"
char *getcwd(char *buf, size_t size)
{
char tmp[buf ? 1 : PATH_MAX];
if (!buf) {
buf = tmp;
size = sizeof tmp;
} else if (!size) {
errno = EINVAL;
return 0;
}
long ret = syscall(SYS_getcwd, buf, size);
if (ret < 0) {
if (errno == ENAMETOOLONG)
errno = ENOMEM;
return 0;
}
if (ret == 0 || buf[0] != '/') {
errno = ENOENT;
return 0;
}
return buf == tmp ? strdup(buf) : buf;
}
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