bpo-34170: Cleanup pymain_run_filename() (GH-8631)

* Inline pymain_run_file() and pymain_open_filename() into
  pymain_run_filename()
* Created pymain_run_stdin() which is pymain_run_filename() with
  filename=NULL
* Rename pymain_run_filename() to pymain_run_file()

Modules/main.c

@@ -300,43 +300,6 @@ error:
 }
 
 
-static int
-pymain_run_file(FILE *fp, const wchar_t *filename, PyCompilerFlags *p_cf)
-{
-    PyObject *unicode, *bytes = NULL;
-    const char *filename_str;
-    int run;
-
-    /* call pending calls like signal handlers (SIGINT) */
-    if (Py_MakePendingCalls() == -1) {
-        PyErr_Print();
-        return 1;
-    }
-
-    if (filename) {
-        unicode = PyUnicode_FromWideChar(filename, wcslen(filename));
-        if (unicode != NULL) {
-            bytes = PyUnicode_EncodeFSDefault(unicode);
-            Py_DECREF(unicode);
-        }
-        if (bytes != NULL) {
-            filename_str = PyBytes_AsString(bytes);
-        }
-        else {
-            PyErr_Clear();
-            filename_str = "<encoding error>";
-        }
-    }
-    else {
-        filename_str = "<stdin>";
-    }
-
-    run = PyRun_AnyFileExFlags(fp, filename_str, filename != NULL, p_cf);
-    Py_XDECREF(bytes);
-    return run != 0;
-}
-
-
 /* Main program */
 
 typedef struct {
@@ -1101,17 +1064,43 @@ pymain_import_readline(_PyMain *pymain)
 }
 
 
-static FILE*
-pymain_open_filename(_PyMain *pymain, _PyCoreConfig *config)
+static void
+pymain_run_startup(_PyMain *pymain, _PyCoreConfig *config, PyCompilerFlags *cf)
 {
-    FILE* fp;
+    const char *startup = _PyCoreConfig_GetEnv(config, "PYTHONSTARTUP");
+    if (startup == NULL) {
+        return;
+    }
 
-    fp = _Py_wfopen(pymain->filename, L"r");
+    FILE *fp = _Py_fopen(startup, "r");
+    if (fp == NULL) {
+        int save_errno = errno;
+        PySys_WriteStderr("Could not open PYTHONSTARTUP\n");
+        errno = save_errno;
+
+        PyErr_SetFromErrnoWithFilename(PyExc_OSError,
+                        startup);
+        PyErr_Print();
+        PyErr_Clear();
+        return;
+    }
+
+    (void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);
+    PyErr_Clear();
+    fclose(fp);
+}
+
+
+static void
+pymain_run_file(_PyMain *pymain, _PyCoreConfig *config, PyCompilerFlags *cf)
+{
+    const wchar_t *filename = pymain->filename;
+    FILE *fp = _Py_wfopen(filename, L"r");
     if (fp == NULL) {
         char *cfilename_buffer;
         const char *cfilename;
         int err = errno;
-        cfilename_buffer = _Py_EncodeLocaleRaw(pymain->filename, NULL);
+        cfilename_buffer = _Py_EncodeLocaleRaw(filename, NULL);
         if (cfilename_buffer != NULL)
             cfilename = cfilename_buffer;
         else
@@ -1120,13 +1109,12 @@ pymain_open_filename(_PyMain *pymain, _PyCoreConfig *config)
                 config->program, cfilename, err, strerror(err));
         PyMem_RawFree(cfilename_buffer);
         pymain->status = 2;
-        return NULL;
+        return;
     }
 
     if (pymain->skip_first_line) {
         int ch;
-        /* Push back first newline so line numbers
-           remain the same */
+        /* Push back first newline so line numbers remain the same */
         while ((ch = getc(fp)) != EOF) {
             if (ch == '\n') {
                 (void)ungetc(ch, fp);
@@ -1136,70 +1124,65 @@ pymain_open_filename(_PyMain *pymain, _PyCoreConfig *config)
     }
 
     struct _Py_stat_struct sb;
-    if (_Py_fstat_noraise(fileno(fp), &sb) == 0 &&
-            S_ISDIR(sb.st_mode)) {
+    if (_Py_fstat_noraise(fileno(fp), &sb) == 0 && S_ISDIR(sb.st_mode)) {
         fprintf(stderr,
                 "%ls: '%ls' is a directory, cannot continue\n",
-                config->program, pymain->filename);
-        fclose(fp);
+                config->program, filename);
         pymain->status = 1;
-        return NULL;
+        goto done;
     }
 
-    return fp;
-}
-
-
-static void
-pymain_run_startup(_PyMain *pymain, _PyCoreConfig *config, PyCompilerFlags *cf)
-{
-    const char *startup = _PyCoreConfig_GetEnv(config, "PYTHONSTARTUP");
-    if (startup == NULL) {
-        return;
+    /* call pending calls like signal handlers (SIGINT) */
+    if (Py_MakePendingCalls() == -1) {
+        PyErr_Print();
+        pymain->status = 1;
+        goto done;
     }
 
-    FILE *fp = _Py_fopen(startup, "r");
-    if (fp == NULL) {
-        int save_errno = errno;
-        PySys_WriteStderr("Could not open PYTHONSTARTUP\n");
-        errno = save_errno;
+    PyObject *unicode, *bytes = NULL;
+    const char *filename_str;
 
-        PyErr_SetFromErrnoWithFilename(PyExc_OSError,
-                        startup);
-        PyErr_Print();
+    unicode = PyUnicode_FromWideChar(filename, wcslen(filename));
+    if (unicode != NULL) {
+        bytes = PyUnicode_EncodeFSDefault(unicode);
+        Py_DECREF(unicode);
+    }
+    if (bytes != NULL) {
+        filename_str = PyBytes_AsString(bytes);
+    }
+    else {
         PyErr_Clear();
-        return;
+        filename_str = "<filename encoding error>";
     }
 
-    (void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);
-    PyErr_Clear();
+    int run = PyRun_AnyFileExFlags(fp, filename_str, 0, cf);
+    Py_XDECREF(bytes);
+    pymain->status = (run != 0);
+
+done:
     fclose(fp);
 }
 
 
 static void
-pymain_run_filename(_PyMain *pymain, _PyCoreConfig *config,
-                    PyCompilerFlags *cf)
+pymain_run_stdin(_PyMain *pymain, _PyCoreConfig *config, PyCompilerFlags *cf)
 {
-    if (pymain->filename == NULL && pymain->stdin_is_interactive) {
+    if (pymain->stdin_is_interactive) {
         Py_InspectFlag = 0; /* do exit on SystemExit */
         config->inspect = 0;
         pymain_run_startup(pymain, config, cf);
         pymain_run_interactive_hook();
     }
 
-    FILE *fp;
-    if (pymain->filename != NULL) {
-        fp = pymain_open_filename(pymain, config);
-        if (fp == NULL) {
-            return;
-        }
-    }
-    else {
-        fp = stdin;
+    /* call pending calls like signal handlers (SIGINT) */
+    if (Py_MakePendingCalls() == -1) {
+        PyErr_Print();
+        pymain->status = 1;
+        return;
     }
 
-    pymain->status = pymain_run_file(fp, pymain->filename, cf);
+    int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, cf);
+    pymain->status = (run != 0);
 }
 
 
@@ -1618,8 +1601,11 @@ pymain_run_python(_PyMain *pymain, PyInterpreterState *interp)
         int sts = pymain_run_module(L"__main__", 0);
         pymain->status = (sts != 0);
     }
+    else if (pymain->filename != NULL) {
+        pymain_run_file(pymain, config, &cf);
+    }
     else {
-        pymain_run_filename(pymain, config, &cf);
+        pymain_run_stdin(pymain, config, &cf);
     }
 
     pymain_repl(pymain, config, &cf);