fs Fix bug, check if fs_read() returned < 0

ulib/umalloc/umalloc.c

@@ -148,3 +148,18 @@ void *urealloc(void *ptr, size_t newsize) {
 err:
   return NULL;
 }
+
+void *umallocbig(size_t size) {
+  size_t allocsz = ALIGN_UP(size, 4096);
+  uint8_t *out;
+  int32_t ret = mman_map(NULL, allocsz, MMAN_MAP_PF_RW, 0, &out);
+  if (out == NULL || ret != E_OK) {
+    return NULL;
+  }
+  return out;
+}
+
+void ufreebig(void *addr) {
+  if (addr != NULL)
+    mman_unmap(addr);
+}

ulib/umalloc/umalloc.h

@@ -7,5 +7,7 @@
 void *umalloc(size_t size);
 void ufree(void *ptr_);
 void *urealloc(void *ptr, size_t newsize);
+void *umallocbig(size_t size);
+void ufreebig(void *addr);
 
 #endif // ULIB_UMALLOC_UMALLOC_H_

ulib/util/util.h

@@ -21,6 +21,8 @@
   (_a > _b ? _a : _b); \
 })
 
+#define ALIGN_UP(x, align) (((x) + ((align)-1)) & ~((align)-1))
+
 void quit(void);
 
 #endif // ULIB_UTIL_UTIL_H_

user/fs/fetch.c

@@ -60,7 +60,7 @@ void fs_fetch(void) {
     uint8_t *buf = umalloc(statbuf.size+1);
     string_memset(buf, 0, statbuf.size+1);
 
-    if (fs_read(h, buf, statbuf.size, 0)) {
+    if (fs_read(h, buf, statbuf.size, 0) < 0) {
       uprintf("fs: coult not read %s\n", path);
       goto donefile;
       return;