mirror of https://github.com/CPunch/Cosmo.git
added os.open(); new file object
eg.
```lua
local err, file = os.open("LICENSE.md")
if err then
// do error handling stuff
end
// passing "a" to read() will read the whole file
print(file:read("a"))
```
This commit is contained in:
parent
bf36412699
commit
b3587f48a2
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@ -0,0 +1,9 @@
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local err, file = os.open("LICENSE.md")
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print("made file")
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if err then
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print("failed to open file")
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end
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print(file)
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print(file:read("a"))
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178
src/cbaselib.c
178
src/cbaselib.c
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@ -69,7 +69,7 @@ int cosmoB_pcall(CState *state, int nargs, CValue *args)
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bool res = cosmoV_pcall(state, nargs - 1, 1);
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// insert false before the result
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cosmo_insert(state, 0, cosmoV_newBoolean(res));
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cosmoV_insert(state, 0, cosmoV_newBoolean(res));
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return 2;
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}
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@ -105,7 +105,7 @@ int cosmoB_loadstring(CState *state, int nargs, CValue *args)
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CObjString *str = cosmoV_readString(args[0]);
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bool res = cosmoV_compileString(state, str->str, "");
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cosmo_insert(state, 0, cosmoV_newBoolean(res));
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cosmoV_insert(state, 0, cosmoV_newBoolean(res));
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return 2; // <boolean>, <closure> or <error>
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}
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@ -139,7 +139,7 @@ void cosmoB_loadLibrary(CState *state)
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}
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// register all the pushed c functions and the strings as globals
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cosmoV_register(state, i);
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cosmoV_addGlobals(state, i);
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// load other libraries
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cosmoB_loadObjLib(state);
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@ -230,52 +230,129 @@ COSMO_API void cosmoB_loadObjLib(CState *state)
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cosmoV_registerProtoObject(state, COBJ_OBJECT, obj);
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// register "object" to the global table
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cosmoV_register(state, 1);
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cosmoV_addGlobals(state, 1);
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}
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// ================================================================ [OS.*]
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// os.read()
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int cosmoB_osRead(CState *state, int nargs, CValue *args)
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int fileB_read(CState *state, int nargs, CValue *args)
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{
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if (nargs != 2) {
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cosmoV_error(state, "file:read() expected 2 arguments, got %d!", nargs);
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}
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if (!cosmoV_isValueUserType(state, args[0], COSMO_USER_FILE)) {
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cosmoV_typeError(state, "file:read()", "<file>, <number> or \"a\"", "%s, %s",
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cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
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}
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CObjObject *fileObj = cosmoV_readObject(args[0]);
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FILE *file = cosmoO_getUserP(fileObj);
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if (IS_NUMBER(args[1])) {
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cosmo_Number length = cosmoV_readNumber(args[1]);
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// make sure the length is within the bounds of the file
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if (length < 0) {
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cosmoV_error(state, "file:read() expected length to be >= 0, got %d!", length);
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}
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// allocate a buffer for the read data
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char *buffer = cosmoM_xmalloc(state, length + 1);
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// read the data
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fread(buffer, sizeof(char), length, file);
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// push the read data
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CValue temp = cosmoV_newRef(cosmoO_takeString(state, buffer, length));
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cosmoV_pushValue(state, temp);
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} else if (IS_STRING(args[1])) {
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if (strcmp(cosmoV_readCString(args[1]), "a") == 0) {
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// get the length of the file
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fseek(file, 0, SEEK_END);
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long length = ftell(file);
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fseek(file, 0, SEEK_SET);
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// allocate a buffer for the read data
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char *buffer = cosmoM_xmalloc(state, length + 1);
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// read the data
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fread(buffer, sizeof(char), length, file);
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buffer[length] = '\0'; // write the NULL terminator
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// push the read data
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CValue temp = cosmoV_newRef(cosmoO_takeString(state, buffer, length));
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cosmoV_pushValue(state, temp);
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} else {
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cosmoV_error(state, "file:read() expected \"a\" or <number>, got %s!",
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cosmoV_readCString(args[1]));
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}
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} else {
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cosmoV_typeError(state, "file:read()", "<file>, <number> or \"a\"", "%s, %s",
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cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
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}
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return 1;
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}
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int fileB_gc(CState *state, int nargs, CValue *args) {
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if (nargs != 1) {
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cosmoV_error(state, "os.read() expected 1 argument, got %d!", nargs);
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cosmoV_error(state, "file:read() expected 1 argument, got %d!", nargs);
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}
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if (!cosmoV_isValueUserType(state, args[0], COSMO_USER_FILE)) {
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cosmoV_typeError(state, "file:__gc()", "<file>", "%s",
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cosmoV_typeStr(args[0]));
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}
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CObjObject *fileObj = cosmoV_readObject(args[0]);
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FILE *file = cosmoO_getUserP(fileObj);
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fclose(file);
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return 0;
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}
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CObjObject *pushFileObj(CState *state, FILE *file)
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{
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CObjObject *fileObj = cosmoO_newObject(state);
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cosmoV_pushRef(state, (CObj *)fileObj);
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cosmoO_setUserP(fileObj, file);
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cosmoO_setUserT(fileObj, COSMO_USER_FILE);
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// grab and set proto
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cosmoV_pushRef(state, (CObj *)fileObj);
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cosmoV_pushString(state, "file");
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cosmoV_getRegistry(state);
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cosmoV_setProto(state);
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cosmoO_lock(fileObj);
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return fileObj;
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}
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int cosmoB_osOpen(CState *state, int nargs, CValue *args)
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{
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FILE *file;
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if (nargs != 1) {
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cosmoV_error(state, "os.open() expected 1 argument, got %d!", nargs);
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}
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if (!IS_STRING(args[0])) {
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cosmoV_typeError(state, "os.read()", "<string>", "%s", cosmoV_typeStr(args[0]));
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cosmoV_typeError(state, "os.open()", "<string>", "%s", cosmoV_typeStr(args[0]));
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}
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CObjString *str = cosmoV_readString(args[0]);
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// open file
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FILE *file = fopen(str->str, "rb");
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char *buf;
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size_t size, bRead;
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const char *filePath = cosmoV_readCString(args[0]);
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file = fopen(filePath, "rb");
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if (file == NULL) {
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// return nil, file doesn't exist
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return 0;
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cosmoV_pushBoolean(state, true);
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cosmoV_pushFString(state, "Failed to open %s!", filePath);
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return 2;
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}
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// grab the size of the file
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fseek(file, 0L, SEEK_END);
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size = ftell(file);
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rewind(file);
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buf = cosmoM_xmalloc(state, size + 1); // +1 for the NULL terminator
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bRead = fread(buf, sizeof(char), size, file); // read the file into the buffer
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if (bRead < size) {
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// an error occured! we don't need to really throw an error, returning a nil is good enough
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return 0;
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}
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buf[bRead] = '\0'; // place the NULL terminator at the end of the buffer
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// push the string to the stack to return
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cosmoV_pushValue(state, cosmoV_newRef(cosmoO_takeString(state, buf, bRead)));
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return 1;
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cosmoV_pushBoolean(state, false);
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pushFileObj(state, file);
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return 2;
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}
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// os.time()
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@ -309,9 +386,8 @@ int cosmoB_osSystem(CState *state, int nargs, CValue *args)
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COSMO_API void cosmoB_loadOS(CState *state)
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{
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const char *identifiers[] = {"read", "time", "system"};
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CosmoCFunction osLib[] = {cosmoB_osRead, cosmoB_osTime, cosmoB_osSystem};
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const char *identifiers[] = {"open", "time", "system"};
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CosmoCFunction osLib[] = {cosmoB_osOpen, cosmoB_osTime, cosmoB_osSystem};
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cosmoV_pushString(state, "os");
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@ -322,7 +398,25 @@ COSMO_API void cosmoB_loadOS(CState *state)
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}
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cosmoV_makeObject(state, i);
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cosmoV_register(state, 1); // register the os.* object to the global table
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cosmoV_addGlobals(state, 1); // register the os.* object to the global table
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// make file proto
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cosmoV_pushString(state, "file");
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CObjObject *fileProto = cosmoO_newObject(state);
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cosmoV_pushRef(state, (CObj *)fileProto);
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cosmoV_pushRef(state, (CObj *)fileProto);
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cosmoV_pushString(state, "read");
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cosmoV_pushCFunction(state, fileB_read);
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cosmoV_set(state);
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cosmoV_pushRef(state, (CObj *)fileProto);
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cosmoV_pushString(state, "__gc");
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cosmoV_pushCFunction(state, fileB_gc);
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cosmoV_set(state);
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cosmoV_addRegistry(state, 1);
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}
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// ================================================================ [STRING.*]
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@ -578,7 +672,7 @@ void cosmoB_loadStrLib(CState *state)
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cosmoV_registerProtoObject(state, COBJ_STRING, obj);
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// register "string" to the global table
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cosmoV_register(state, 1);
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cosmoV_addGlobals(state, 1);
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}
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// ================================================================ [MATH]
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@ -773,7 +867,7 @@ void cosmoB_loadMathLib(CState *state)
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// make the object and register it as a global to the state
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cosmoV_makeObject(state, i);
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cosmoV_register(state, 1);
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cosmoV_addGlobals(state, 1);
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}
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// ================================================================ [VM.*]
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@ -930,5 +1024,5 @@ void cosmoB_loadVM(CState *state)
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cosmoV_makeObject(state, 5); // makes the vm object
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// register "vm" to the global table
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cosmoV_register(state, 1);
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cosmoV_addGlobals(state, 1);
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}
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@ -3,6 +3,13 @@
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#include "cstate.h"
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enum
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{
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COSMO_USER_NONE, // CObjObject is not a userdata object
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COSMO_USER_FILE, // CObjObject is a file object (see cosmoB_osOpen)
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COSMO_USER_START // the first user type for user-defined userdata
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};
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/* loads all of the base library, including:
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- base library ("print", "assert", "type", "pcall", "loadstring", etc.)
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- object library
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