clearer(?) code (also avoids a warning about 'c' being used

without initialization)

liolib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 2.140 2014/11/02 19:33:33 roberto Exp roberto $
+** $Id: liolib.c,v 2.141 2014/11/21 12:17:33 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -464,9 +464,9 @@ static int test_eof (lua_State *L, FILE *f) {
 
 static int read_line (lua_State *L, FILE *f, int chop) {
   luaL_Buffer b;
-  int c;
+  int c = '\0';
   luaL_buffinit(L, &b);
-  for (;;) {
+  while (c != EOF && c != '\n') {  /* repeat until end of line */
     char *buff = luaL_prepbuffer(&b);  /* pre-allocate buffer */
     int i = 0;
     l_lockfile(f);  /* no memory errors can happen inside the lock */
@@ -474,8 +474,6 @@ static int read_line (lua_State *L, FILE *f, int chop) {
       buff[i++] = c;
     l_unlockfile(f);
     luaL_addsize(&b, i);
-    if (i < LUAL_BUFFERSIZE)
-      break;
   }
   if (!chop && c == '\n')  /* want a newline and have one? */
     luaL_addchar(&b, c);  /* add ending newline to result */