NJU-ProjectN/abstract-machine ics2023 initialized

NJU-ProjectN/abstract-machine 3348db971fd860be5cb28e21c18f9d0e65d0c96a Merge pull request #8 from Jasonyanyusong/master

abstract-machine/klib/src/stdlib.c

@@ -0,0 +1,45 @@
+#include <am.h>
+#include <klib.h>
+#include <klib-macros.h>
+
+#if !defined(__ISA_NATIVE__) || defined(__NATIVE_USE_KLIB__)
+static unsigned long int next = 1;
+
+int rand(void) {
+  // RAND_MAX assumed to be 32767
+  next = next * 1103515245 + 12345;
+  return (unsigned int)(next/65536) % 32768;
+}
+
+void srand(unsigned int seed) {
+  next = seed;
+}
+
+int abs(int x) {
+  return (x < 0 ? -x : x);
+}
+
+int atoi(const char* nptr) {
+  int x = 0;
+  while (*nptr == ' ') { nptr ++; }
+  while (*nptr >= '0' && *nptr <= '9') {
+    x = x * 10 + *nptr - '0';
+    nptr ++;
+  }
+  return x;
+}
+
+void *malloc(size_t size) {
+  // On native, malloc() will be called during initializaion of C runtime.
+  // Therefore do not call panic() here, else it will yield a dead recursion:
+  //   panic() -> putchar() -> (glibc) -> malloc() -> panic()
+#if !(defined(__ISA_NATIVE__) && defined(__NATIVE_USE_KLIB__))
+  panic("Not implemented");
+#endif
+  return NULL;
+}
+
+void free(void *ptr) {
+}
+
+#endif