Get nyancat nyanning in Serenity.

I found a cute program that renders an animated nyancat in the terminal.
This patch adds enough hackery to get it working correctly. :^)

LibC/string.cpp

@@ -5,6 +5,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <AK/Types.h>
+#include <AK/StdLibExtras.h>
 
 extern "C" {
 
@@ -60,6 +61,15 @@ char* strdup(const char* str)
     return new_str;
 }
 
+char* strndup(const char* str, size_t maxlen)
+{
+    size_t len = min(strlen(str), maxlen);
+    char* new_str = (char*)malloc(len + 1);
+    memcpy(new_str, str, len);
+    new_str[len] = 0;
+    return new_str;
+}
+
 int strcmp(const char* s1, const char* s2)
 {
     while (*s1 == *s2++)

LibC/string.h

@@ -15,6 +15,8 @@ void* memchr(const void*, int c, size_t);
 void bzero(void*, size_t);
 void bcopy(const void*, void*, size_t);
 void* memset(void*, int, size_t);
+char* strdup(const char*);
+char* strndup(const char*, size_t);
 char* strcpy(char* dest, const char* src);
 char* strncpy(char* dest, const char* src, size_t);
 char* strchr(const char*, int c);

LibC/sys/types.h

@@ -29,6 +29,7 @@ typedef uint32_t nlink_t;
 typedef uint32_t blksize_t;
 typedef uint32_t blkcnt_t;
 typedef uint32_t time_t;
+typedef uint32_t useconds_t;
 typedef uint32_t suseconds_t;
 typedef uint32_t clock_t;
 typedef uint32_t socklen_t;

LibC/time.h

@@ -30,5 +30,7 @@ time_t time(time_t*);
 char* ctime(const time_t*);
 void tzset();
 
+#define difftime(t1,t0) (double)(t1 - t0)
+
 __END_DECLS
 

LibC/unistd.cpp

@@ -201,6 +201,11 @@ int sleep(unsigned seconds)
     return syscall(SC_sleep, seconds);
 }
 
+int usleep(useconds_t usec)
+{
+    return syscall(SC_usleep, usec);
+}
+
 int gethostname(char* buffer, size_t size)
 {
     int rc = syscall(SC_gethostname, buffer, size);

LibC/unistd.h

@@ -42,6 +42,7 @@ int fstat(int fd, struct stat* statbuf);
 int lstat(const char* path, struct stat* statbuf);
 int stat(const char* path, struct stat* statbuf);
 int sleep(unsigned seconds);
+int usleep(useconds_t);
 int gethostname(char*, size_t);
 ssize_t readlink(const char* path, char* buffer, size_t);
 char* ttyname(int fd);