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added comment explaining why the 'feof' test when loading a file

This commit is contained in:
Roberto Ierusalimschy 2009-04-02 16:54:06 -03:00
parent 83d2dbb15d
commit ae9ad6c694
1 changed files with 4 additions and 1 deletions
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5
lauxlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.184 2009/02/27 18:18:19 roberto Exp roberto $
** $Id: lauxlib.c,v 1.185 2009/03/31 17:25:08 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -496,6 +496,9 @@ static const char *getF (lua_State *L, void *ud, size_t *size) {
*size = 1;
return "\n";
}
/* 'fread' can return > 0 *and* set the EOF flag. If next call to
'getF' calls 'fread', terminal may still wait for user input.
The next check avoids this problem. */
if (feof(lf->f)) return NULL;
*size = fread(lf->buff, 1, sizeof(lf->buff), lf->f);
return (*size > 0) ? lf->buff : NULL;