ulib uprintf to pipe not termdev, ulib Add stringbuffer and linearlist, tb Capture subshell output

ulib/umalloc/umalloc.c

@@ -118,3 +118,33 @@ void ufree(void *ptr_) {
   }
 }
 
+void *urealloc(void *ptr, size_t newsize) {
+  void *new;
+
+  UmBlock *block = (UmBlock *)(ptr - sizeof(UmBlock));
+  if (block->magic != BLOCK_MAGIC || block->data != ptr) {
+    goto err;
+  }
+
+  if (!ptr) {
+    new = umalloc(newsize);
+    if (!new) {
+      goto err;
+    }
+  } else {
+    if (block->size < newsize) {
+      new = umalloc(newsize);
+      if (!new) {
+        goto err;
+      }
+      string_memcpy(new, ptr, block->size);
+      ufree(ptr);
+    } else {
+      new = ptr;
+    }
+  }
+  return new;
+
+err:
+  return NULL;
+}

ulib/umalloc/umalloc.h

@@ -6,5 +6,6 @@
 
 void *umalloc(size_t size);
 void ufree(void *ptr_);
+void *urealloc(void *ptr, size_t newsize);
 
 #endif // ULIB_UMALLOC_UMALLOC_H_