Run python tests as typed in REPL, displaying code input + result

gentest.c

#include <stdio.h>
#include <stdlib.h>

#define PY_SSIZE_T_CLEAN
#include <Python.h>

// NEED https://github.com/python/cpython/pull/22190 applied !

#define MAX 1024
char buf[MAX];

#define TEST_CODE "repltest.py"

int
main(int argc, char *argv[])
{
    wchar_t *program = Py_DecodeLocale(argv[0], NULL);
    if (program == NULL) {
        fprintf(stderr, "Fatal error: cannot decode argv[0]\n");
        exit(1);
    }
    Py_SetProgramName(program);  /* optional but recommended */
    Py_Initialize();

    PyRun_SimpleString("import sys;sys.ps1='';sys.ps2=''");

    FILE *one_file = NULL;

    one_file = fopen(TEST_CODE, "r");
    int line =  0;
    int revert = 0 ;
    if (one_file) {
        while( fgets(&buf[0], MAX, one_file) ) {
            int reverse = ftell( one_file );
            fprintf( stdout, "%d: %s",++line, buf );
            fseek(one_file, revert, SEEK_SET);
            int res = PyRun_InteractiveOne( one_file, TEST_CODE);
            revert = ftell(one_file);
        }
       fclose(one_file);
    } else {
        fprintf( stdout, "IO error\n");
    }

    if (Py_FinalizeEx() < 0) {
        exit(1);
    }
    PyMem_RawFree(program);
    return 0;
}