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#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "syscall.h"
int renameat(int oldfd, const char *old, int newfd, const char *new)
{
char old_copy[PATH_MAX+1], new_copy[PATH_MAX+1];
char *base;
if (strlen(old) > PATH_MAX || strlen(new) > PATH_MAX) {
errno = ENAMETOOLONG;
return -1;
}
if (strlen(old) == 0 || strlen(new) == 0) {
errno = ENOENT;
return -1;
}
strcpy(old_copy, old);
strcpy(new_copy, new);
base = basename(old_copy);
strncpy(old_copy, base, sizeof(old_copy));
base = basename(new_copy);
strncpy(new_copy, base, sizeof(new_copy));
if (strcmp(old_copy, ".") == 0 || strcmp(old_copy, "..") == 0 ||
strcmp(new_copy, ".") == 0 || strcmp(new_copy, "..") == 0) {
errno = EINVAL;
return -1;
}
return syscall(SYS_renameat, oldfd, old, newfd, new);
}
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