feat: Add C strdup()

interop/nkic/region.c

@@ -5,6 +5,8 @@ Released under Apache 2.0 license as described in the file LICENSE.
 #include "region.h"
 #include "stdc.h"
 
+#include <stdio.h>
+
 struct block {
   size_t size;
   size_t offset;
@@ -51,7 +53,7 @@ void region_destroy(struct region *region) {
   }
 }
 
-void *region_alloc(struct region *region, size_t size) {
+void *region_try_alloc(struct region *region, size_t size) {
   if (unlikely(!region))
     return NULL;
 
@@ -78,3 +80,34 @@ void *region_alloc(struct region *region, size_t size) {
   b->offset += size;
   return p;
 }
+
+void *region_alloc(struct region *region, size_t size) {
+  void *p = region_try_alloc(region, size);
+  if (unlikely(!p)) {
+    fprintf(stderr, "Out Of Memory. NKI compiler will abort the program.\n");
+    abort();
+  }
+
+  return p;
+}
+
+char *region_strdup(struct region *region, const char *src) {
+  assert(src);
+  size_t size = strlen(src) + 1;
+  char *dst = region_alloc(region, size);
+  // copy everything, including null-terminator
+  memcpy(dst, src, size);
+  return dst;
+}
+
+char *region_strndup(struct region *region, const char *src, size_t len) {
+  assert(src);
+
+  // check for null-terminator earlier than `len`
+  len = strnlen(src, len);
+
+  char *dst = region_alloc(region, len + 1);
+  memcpy(dst, src, len);
+  dst[len] = 0; // add null-terminator
+  return dst;
+}

interop/nkic/region.h

@@ -7,7 +7,21 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 struct region;
 
-struct region *region_create();
+struct region *region_create(void);
 void region_destroy(struct region *region);
 
+// Return newly allocated memory, or NULL if allocation fails.
+// Note that ALL OTHER allocation functions will abort if allocation fails;
+// they will never return NULL.
+void *region_try_alloc(struct region *region, size_t size);
+
+// Return newly allocated memory.
 void *region_alloc(struct region *region, size_t size);
+
+// Return newly allocated copy of null-terminated string.
+char *region_strdup(struct region *region, const char *src);
+
+// Return newly allocated copy of string, with at most `len` bytes copied.
+// Copying stops when `len` bytes are copied, or a null-terminator is found.
+// The new string is always null-terminated.
+char *region_strndup(struct region *region, const char *src, size_t len);