Merge 6cc3d8023350163e72b83d49981ad2c4b08d39b4 into 5d30381e1915c1f3a148ef39e81002984d3951d8

src/modules/os.c

@@ -136,6 +136,7 @@ static bool io_FileIO__exit__(int argc, py_Ref argv) {
 
 static bool io_FileIO_read(int argc, py_Ref argv) {
     io_FileIO* ud = py_touserdata(py_arg(0));
+    if(ud->file == NULL) return ValueError("I/O operation on closed file");
     bool is_binary = ud->mode[strlen(ud->mode) - 1] == 'b';
     int size;
     if(argc == 1) {
@@ -146,24 +147,37 @@ static bool io_FileIO_read(int argc, py_Ref argv) {
     } else if(argc == 2) {
         PY_CHECK_ARG_TYPE(1, tp_int);
         size = py_toint(py_arg(1));
+        if (size < 0) {
+            long current = ftell(ud->file);
+            fseek(ud->file, 0, SEEK_END);
+            size = ftell(ud->file);
+            fseek(ud->file, current, SEEK_SET);
+        }
     } else {
         return TypeError("read() takes at most 2 arguments (%d given)", argc);
     }
     if(is_binary) {
         void* dst = py_newbytes(py_retval(), size);
-        int actual_size = fread(dst, 1, size, ud->file);
-        py_bytes_resize(py_retval(), actual_size);
+        if(size > 0) {
+            int actual_size = fread(dst, 1, size, ud->file);
+            py_bytes_resize(py_retval(), actual_size);
+        }
     } else {
-        void* dst = PK_MALLOC(size);
-        int actual_size = fread(dst, 1, size, ud->file);
-        py_newstrv(py_retval(), (c11_sv){dst, actual_size});
-        PK_FREE(dst);
+        if(size > 0) {
+            void* dst = PK_MALLOC(size);
+            int actual_size = fread(dst, 1, size, ud->file);
+            py_newstrv(py_retval(), (c11_sv){dst, actual_size});
+            PK_FREE(dst);
+        } else {
+            py_newstr(py_retval(), "");
+        }
     }
     return true;
 }
 
 static bool io_FileIO_tell(int argc, py_Ref argv) {
     io_FileIO* ud = py_touserdata(py_arg(0));
+    if(ud->file == NULL) return ValueError("I/O operation on closed file");
     py_newint(py_retval(), ftell(ud->file));
     return true;
 }
@@ -173,6 +187,7 @@ static bool io_FileIO_seek(int argc, py_Ref argv) {
     PY_CHECK_ARG_TYPE(1, tp_int);
     PY_CHECK_ARG_TYPE(2, tp_int);
     io_FileIO* ud = py_touserdata(py_arg(0));
+    if(ud->file == NULL) return ValueError("I/O operation on closed file");
     long cookie = py_toint(py_arg(1));
     int whence = py_toint(py_arg(2));
     py_newint(py_retval(), fseek(ud->file, cookie, whence));
@@ -193,6 +208,7 @@ static bool io_FileIO_close(int argc, py_Ref argv) {
 static bool io_FileIO_write(int argc, py_Ref argv) {
     PY_CHECK_ARGC(2);
     io_FileIO* ud = py_touserdata(py_arg(0));
+    if(ud->file == NULL) return ValueError("I/O operation on closed file");
     size_t written_size;
     if(ud->mode[strlen(ud->mode) - 1] == 'b') {
         PY_CHECK_ARG_TYPE(1, tp_bytes);
@@ -211,11 +227,36 @@ static bool io_FileIO_write(int argc, py_Ref argv) {
 static bool io_FileIO_flush(int argc, py_Ref argv) {
     PY_CHECK_ARGC(1);
     io_FileIO* ud = py_touserdata(py_arg(0));
+    if(ud->file == NULL) return ValueError("I/O operation on closed file");
     fflush(ud->file);
     py_newnone(py_retval());
     return true;
 }
-
+static bool io_FileIO_readlines(int argc, py_Ref argv) {
+    PY_CHECK_ARGC(1);
+    io_FileIO* ud = py_touserdata(py_arg(0));
+    py_newlist(py_retval()); 
+    char* buf = NULL;
+    size_t buf_size = 0;
+    size_t len = 0;
+    int c;
+    while(true) {
+        len = 0;
+        while((c = fgetc(ud->file)) != EOF) {
+            if(len + 1 >= buf_size) {
+                buf_size = (buf_size == 0) ? 64 : buf_size * 2;
+                buf = PK_REALLOC(buf, buf_size);
+            }
+            buf[len++] = (char)c;
+            if(c == '\n') break;
+        }
+        if(len == 0) break;
+        py_newstrv(py_getreg(0), (c11_sv){buf, len});
+        py_list_append(py_retval(), py_getreg(0));
+    }
+    if(buf) PK_FREE(buf);
+    return true;
+}
 void pk__add_module_io() {
     py_Ref mod = py_newmodule("io");
 
@@ -230,6 +271,7 @@ void pk__add_module_io() {
     py_bindmethod(FileIO, "tell", io_FileIO_tell);
     py_bindmethod(FileIO, "seek", io_FileIO_seek);
     py_bindmethod(FileIO, "flush", io_FileIO_flush);
+    py_bindmethod(FileIO, "readlines", io_FileIO_readlines);
 
     py_newint(py_emplacedict(mod, py_name("SEEK_SET")), SEEK_SET);
     py_newint(py_emplacedict(mod, py_name("SEEK_CUR")), SEEK_CUR);

tests/792_file.py

@@ -38,7 +38,7 @@ with open('123.txt', 'rt') as f:
     assert f.read() == ''
     f.seek(3, io.SEEK_SET)
     assert f.tell() == 3
-    assert f.read() == '456'
+    assert f.read(-1) == '456'
     assert f.tell() == 6
 
 with open('123.txt', 'a') as f: