src/auxlib.c

   1 char *rcs_auxlib="$Id: auxlib.c,v 1.5 1997/04/14 15:30:03 roberto Exp $";
   2
   3 #include <stdio.h>
   4 #include <stdarg.h>
   5 #include <string.h>
   6
   7 #include "lua.h"
   8 #include "auxlib.h"
   9 #include "luadebug.h"
  10
  11
  12
  13 int luaI_findstring (char *name, char *list[])
  14 {
  15   int i;
  16   for (i=0; list[i]; i++)
  17     if (strcmp(list[i], name) == 0)
  18       return i;
  19   return -1;  /* name not found */
  20 }
  21
  22
  23 void luaL_arg_check(int cond, int numarg, char *extramsg)
  24 {
  25   if (!cond) {
  26     char *funcname;
  27     lua_getobjname(lua_stackedfunction(0), &funcname);
  28     if (funcname == NULL)
  29       funcname = "???";
  30     if (extramsg == NULL)
  31       luaL_verror("bad argument #%d to function `%s'", numarg, funcname);
  32     else
  33       luaL_verror("bad argument #%d to function `%s' (%s)",
  34                       numarg, funcname, extramsg);
  35   }
  36 }
  37
  38 char *luaL_check_string (int numArg)
  39 {
  40   lua_Object o = lua_getparam(numArg);
  41   luaL_arg_check(lua_isstring(o), numArg, "string expected");
  42   return lua_getstring(o);
  43 }
  44
  45 char *luaL_opt_string (int numArg, char *def)
  46 {
  47   return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
  48                               luaL_check_string(numArg);
  49 }
  50
  51 double luaL_check_number (int numArg)
  52 {
  53   lua_Object o = lua_getparam(numArg);
  54   luaL_arg_check(lua_isnumber(o), numArg, "number expected");
  55   return lua_getnumber(o);
  56 }
  57
  58
  59 double luaL_opt_number (int numArg, double def)
  60 {
  61   return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
  62                               luaL_check_number(numArg);
  63 }
  64
  65 void luaL_openlib (struct luaL_reg *l, int n)
  66 {
  67   int i;
  68   for (i=0; i<n; i++)
  69     lua_register(l[i].name, l[i].func);
  70 }
  71
  72
  73 void luaL_verror (char *fmt, ...)
  74 {
  75   char buff[1000];
  76   va_list argp;
  77   va_start(argp, fmt);
  78   vsprintf(buff, fmt, argp);
  79   va_end(argp);
  80   lua_error(buff);
  81 }