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Language/OS - Multiplatform Resource Library
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LANGUAGE OS.iso
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lisp
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elk-2_0.lha
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elk-2.0
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src
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load.c
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C/C++ Source or Header
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1992-11-15
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3KB
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140 lines
#include "scheme.h"
Object V_Load_Path, V_Load_Noisilyp, V_Load_Libraries;
#ifdef CAN_LOAD_OBJ
# define Default_Load_Libraries LOAD_LIBRARIES
#else
# define Default_Load_Libraries ""
#endif
#if defined(CAN_DUMP) || defined(USE_LD)
char Loader_Input[20];
#endif
#ifdef USE_LD
# include "load.ld.c"
#else
#ifdef USE_RLD
# include "load.rld.c"
#else
#ifdef USE_SHL
# include "load.shl.c"
#endif
#endif
#endif
Init_Load () {
Define_Variable (&V_Load_Path, "load-path",
Cons (Make_String (".", 1),
Cons (Make_String (SCM_DIR, sizeof (SCM_DIR) - 1),
Cons (Make_String (LIB_DIR, sizeof (LIB_DIR) - 1), Null))));
Define_Variable (&V_Load_Noisilyp, "load-noisily?", False);
Define_Variable (&V_Load_Libraries, "load-libraries",
Make_String (Default_Load_Libraries, sizeof Default_Load_Libraries-1));
}
Init_Loadpath (s) char *s; { /* No GC possible here */
register char *p;
Object path = Null;
if (s[0] == '\0')
return;
while (1) {
for (p = s; *p && *p != ','; p++)
;
path = Cons (Make_String (s, p-s), path);
if (*p == '\0')
break;
s = ++p;
}
Var_Set (V_Load_Path, path);
}
Object Is_O_File (name) Object name; {
register char *p;
register struct S_String *str;
if (TYPE(name) == T_Symbol)
name = SYMBOL(name)->name;
str = STRING(name);
p = str->data + str->size;
return str->size >= 2 && *--p == 'o' && *--p == '.';
}
void Check_Loadarg (x) Object x; {
Object tail;
register t = TYPE(x);
if (t == T_Symbol || t == T_String)
return;
if (t != T_Pair)
Wrong_Type_Combination (x, "string, symbol, or list");
for (tail = x; !Nullp (tail); tail = Cdr (tail)) {
Object f = Car (tail);
if (TYPE(f) != T_Symbol && TYPE(f) != T_String)
Wrong_Type_Combination (f, "string or symbol");
if (!Is_O_File (f))
Primitive_Error ("~s: not an object file", f);
}
}
Object General_Load (what, env) Object what, env; {
Object oldenv;
GC_Node;
Check_Type (env, T_Environment);
oldenv = The_Environment;
GC_Link (oldenv);
Switch_Environment (env);
Check_Loadarg (what);
if (TYPE(what) == T_Pair)
#ifdef CAN_LOAD_OBJ
Load_Object (what)
#endif
;
else if (Is_O_File (what))
#ifdef CAN_LOAD_OBJ
Load_Object (Cons (what, Null))
#endif
;
else
Load_Source (what);
Switch_Environment (oldenv);
GC_Unlink;
return Void;
}
Object P_Load (argc, argv) Object *argv; {
return General_Load (argv[0], argc == 1 ? The_Environment : argv[1]);
}
Load_Source_Port (port) Object port; {
Object val;
GC_Node;
GC_Link (port);
while (1) {
val = General_Read (port, 1);
if (TYPE(val) == T_End_Of_File)
break;
val = Eval (val);
if (Truep (Var_Get (V_Load_Noisilyp))) {
Print (val);
(void)P_Newline (0, (Object *)0);
}
}
GC_Unlink;
}
Load_Source (name) Object name; {
Object port;
GC_Node;
port = General_Open_File (name, P_INPUT, Var_Get (V_Load_Path));
GC_Link (port);
Load_Source_Port (port);
(void)P_Close_Input_Port (port);
GC_Unlink;
}