LibC: Add some things needed to build GNU bc.

This patch adds vprintf(), sig_atomic_t, random() and strdup().
bc doesn't build yet, but it will.

LibC/signal.h

@@ -10,6 +10,7 @@ typedef __sighandler_t sighandler_t;
 
 typedef uint32_t sigset_t;
 typedef void siginfo_t;
+typedef uint32_t sig_atomic_t;
 
 struct sigaction {
     union {

LibC/stdio.cpp

@@ -268,11 +268,16 @@ int fprintf(FILE* stream, const char* fmt, ...)
     return ret;
 }
 
+int vprintf(const char* fmt, va_list ap)
+{
+    return printf_internal(stdout_putch, nullptr, fmt, ap);
+}
+
 int printf(const char* fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
-    int ret = printf_internal(stdout_putch, nullptr, fmt, ap);
+    int ret = vprintf(fmt, ap);
     va_end(ap);
     return ret;
 }

LibC/stdio.h

@@ -50,6 +50,7 @@ int feof(FILE*);
 int fflush(FILE*);
 size_t fread(void* ptr, size_t size, size_t nmemb, FILE*);
 size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE*);
+int vprintf(const char* fmt, va_list);
 int vfprintf(FILE*, const char* fmt, va_list);
 int vsprintf(char* buffer, const char* fmt, va_list);
 int vsnprintf(char* buffer, size_t, const char* fmt, va_list);

LibC/stdlib.cpp

@@ -252,4 +252,14 @@ int abs(int i)
     return i < 0 ? -i : i;
 }
 
+long int random()
+{
+    return rand();
+}
+
+void srandom(unsigned seed)
+{
+    srand(seed);
+}
+
 }

LibC/stdlib.h

@@ -26,5 +26,8 @@ int abs(int);
 int rand();
 void srand(unsigned seed);
 
+long int random();
+void srandom(unsigned seed);
+
 __END_DECLS
 

LibC/string.cpp

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <signal.h>
 #include <assert.h>
+#include <stdlib.h>
 #include <AK/Types.h>
 
 extern "C" {
@@ -51,6 +52,14 @@ size_t strlen(const char* str)
     return len;
 }
 
+char* strdup(const char* str)
+{
+    size_t len = strlen(str);
+    char* new_str = (char*)malloc(len);
+    strcpy(new_str, str);
+    return new_str;
+}
+
 int strcmp(const char* s1, const char* s2)
 {
     while (*s1 == *s2++)