fix: add strings terminators

src/vm/reader/vm_rd_extern_libs.c

@@ -1,6 +1,7 @@
 #include <common/fzl_extern.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <vm/internals/reader.h>
@@ -17,7 +18,10 @@ bool vm_rd_extern_libs(fzl_vm_reader_t *reader, FILE *fd)
 
   reader->extern_libs = malloc(sizeof(char *) * libs_count);
   if (!reader->extern_libs)
+  {
+    snprintf(internal_error, sizeof(internal_error), "out of memory");
     return false;
+  }
 
   memset(reader->extern_libs, 0, sizeof(char *) * libs_count);
 
@@ -30,17 +34,29 @@ bool vm_rd_extern_libs(fzl_vm_reader_t *reader, FILE *fd)
 
     ok = vm_rd_u16(fd, 1, &name_sz);
     if (!ok || name_sz < 1)
+    {
+      snprintf(internal_error, sizeof(internal_error),
+               "failed to read lib #%u name size", i);
       return false;
+    }
 
     ok = vm_rd_char(fd, name_sz, name);
     if (!ok)
+    {
+      snprintf(internal_error, sizeof(internal_error),
+               "failed to read lib #%u name", i);
       return false;
+    }
 
-    char *val = malloc(sizeof(char) * name_sz);
+    char *val = malloc(sizeof(char) * name_sz + 1);
     if (!val)
+    {
+      snprintf(internal_error, sizeof(internal_error),
+               "out of memory on lib #%u name allocation", i);
       return false;
+    }
 
-    memset(val, 0, sizeof(char) * name_sz);
+    memset(val, 0, sizeof(char) * name_sz + 1);
     memcpy(val, name, sizeof(char) * name_sz);
     reader->extern_libs[i] = val;
   }