src/lauxlib.c

   1 /*
   2 ** $Id: lauxlib.c,v 1.17 1999/03/11 18:59:19 roberto Exp $
   3 ** Auxiliary functions for building Lua libraries
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11
  12 /* Please Notice: This file uses only the official API of Lua
  13 ** Any function declared here could be written as an application function.
  14 ** With care, these functions can be used by other libraries.
  15 */
  16
  17 #include "lauxlib.h"
  18 #include "lua.h"
  19 #include "luadebug.h"
  20
  21
  22
  23 int luaL_findstring (char *name, char *list[]) {
  24   int i;
  25   for (i=0; list[i]; i++)
  26     if (strcmp(list[i], name) == 0)
  27       return i;
  28   return -1;  /* name not found */
  29 }
  30
  31 void luaL_argerror (int numarg, char *extramsg) {
  32   lua_Function f = lua_stackedfunction(0);
  33   char *funcname;
  34   lua_getobjname(f, &funcname);
  35   numarg -= lua_nups(f);
  36   if (funcname == NULL)
  37     funcname = "?";
  38   if (extramsg == NULL)
  39     luaL_verror("bad argument #%d to function `%.50s'", numarg, funcname);
  40   else
  41     luaL_verror("bad argument #%d to function `%.50s' (%.100s)",
  42                     numarg, funcname, extramsg);
  43 }
  44
  45 char *luaL_check_lstr (int numArg, long *len)
  46 {
  47   lua_Object o = lua_getparam(numArg);
  48   luaL_arg_check(lua_isstring(o), numArg, "string expected");
  49   if (len) *len = lua_strlen(o);
  50   return lua_getstring(o);
  51 }
  52
  53 char *luaL_opt_lstr (int numArg, char *def, long *len)
  54 {
  55   return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
  56                               luaL_check_lstr(numArg, len);
  57 }
  58
  59 double luaL_check_number (int numArg)
  60 {
  61   lua_Object o = lua_getparam(numArg);
  62   luaL_arg_check(lua_isnumber(o), numArg, "number expected");
  63   return lua_getnumber(o);
  64 }
  65
  66
  67 double luaL_opt_number (int numArg, double def)
  68 {
  69   return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
  70                               luaL_check_number(numArg);
  71 }
  72
  73
  74 lua_Object luaL_tablearg (int arg)
  75 {
  76   lua_Object o = lua_getparam(arg);
  77   luaL_arg_check(lua_istable(o), arg, "table expected");
  78   return o;
  79 }
  80
  81 lua_Object luaL_functionarg (int arg)
  82 {
  83   lua_Object o = lua_getparam(arg);
  84   luaL_arg_check(lua_isfunction(o), arg, "function expected");
  85   return o;
  86 }
  87
  88 lua_Object luaL_nonnullarg (int numArg)
  89 {
  90   lua_Object o = lua_getparam(numArg);
  91   luaL_arg_check(o != LUA_NOOBJECT, numArg, "value expected");
  92   return o;
  93 }
  94
  95 void luaL_openlib (struct luaL_reg *l, int n)
  96 {
  97   int i;
  98   lua_open();  /* make sure lua is already open */
  99   for (i=0; i<n; i++)
 100     lua_register(l[i].name, l[i].func);
 101 }
 102
 103
 104 void luaL_verror (char *fmt, ...)
 105 {
 106   char buff[500];
 107   va_list argp;
 108   va_start(argp, fmt);
 109   vsprintf(buff, fmt, argp);
 110   va_end(argp);
 111   lua_error(buff);
 112 }
 113
 114
 115 void luaL_chunkid (char *out, char *source, int len) {
 116   len -= 13;  /* 13 = strlen("string ''...\0") */
 117   if (*source == '@')
 118     sprintf(out, "file `%.*s'", len, source+1);
 119   else if (*source == '(')
 120     strcpy(out, "(C code)");
 121   else {
 122     char *b = strchr(source , '\n');  /* stop string at first new line */
 123     int lim = (b && (b-source)<len) ? b-source : len;
 124     sprintf(out, "string `%.*s'", lim, source);
 125     strcpy(out+lim+(13-5), "...'");  /* 5 = strlen("...'\0") */
 126   }
 127 }
 128
 129
 130 void luaL_filesource (char *out, char *filename, int len) {
 131   if (filename == NULL) filename = "(stdin)";
 132   sprintf(out, "@%.*s", len-2, filename);  /* -2 for '@' and '\0' */
 133 }