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interpreters/python: use NuttX readline for TTY input

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CPython's default TTY reader bypasses NuttX editing and control-key handling.

Signed-off-by: raiden00pl <raiden00@railab.me>
Assisted-by: Claude Code
This commit is contained in:
raiden00pl 2026-08-22 07:42:22 +02:00 • committed by Xiang Xiao
parent 9545e12054
commit d570175cc9
1 changed files with 116 additions and 0 deletions
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116
interpreters/python/python_wrapper.c
View file

@ -45,6 +45,10 @@
#include <nuttx/drivers/ramdisk.h>
#ifdef CONFIG_SYSTEM_READLINE
# include <system/readline.h>
#endif
#include "romfs_cpython_modules.h"
#include "Python.h"
@ -80,6 +84,17 @@
#define MKMOUNT_DEVNAME(m) "/dev/ram" STR_RAMDEVNO(m)
#define MOUNT_DEVNAME MKMOUNT_DEVNAME(CONFIG_CPYTHON_ROMFS_RAMDEVNO)
#ifdef CONFIG_SYSTEM_READLINE
# if CONFIG_LINE_MAX > 2
# define PYTHON_READLINE_BUFSIZE CONFIG_LINE_MAX
# else
# define PYTHON_READLINE_BUFSIZE 2
# endif
# define PYTHON_READLINE_OPTIONS \
(READLINE_CTRL_D_EOF | READLINE_RETURN_ON_EINTR)
#endif
/****************************************************************************
* Private Types
****************************************************************************/
@ -92,6 +107,103 @@
* Private Functions
****************************************************************************/
#ifdef CONFIG_SYSTEM_READLINE
/****************************************************************************
* Name: python_readline
*
* Description:
* Read an interactive line with the NuttX line editor. CPython calls
* this hook only for a TTY attached to the main interpreter, leaving its
* standard fgets-based reader in place for redirected input and
* subinterpreters.
*
****************************************************************************/
static char *python_readline(FILE *sys_stdin, FILE *sys_stdout,
const char *prompt)
{
#if defined(CONFIG_READLINE_TABCOMPLETION) || defined(CONFIG_READLINE_EDIT)
FAR const char *oldprompt;
#endif
FAR char *line;
FAR char *tmp;
size_t linesize;
size_t used;
ssize_t nread;
fflush(sys_stdout);
if (prompt != NULL)
{
fputs(prompt, stderr);
}
fflush(stderr);
linesize = PYTHON_READLINE_BUFSIZE;
line = PyMem_RawMalloc(linesize);
if (line == NULL)
{
return NULL;
}
used = 0;
#if defined(CONFIG_READLINE_TABCOMPLETION) || defined(CONFIG_READLINE_EDIT)
oldprompt = readline_prompt(prompt);
#endif
for (; ; )
{
nread = readline_fd_ex(line + used, PYTHON_READLINE_BUFSIZE,
fileno(sys_stdin), fileno(sys_stdout),
PYTHON_READLINE_OPTIONS);
if (nread == -EINTR)
{
PyMem_RawFree(line);
line = NULL;
break;
}
if (nread == EOF)
{
line[used] = '\0';
break;
}
used += nread;
if (used > 0 && line[used - 1] == '\n')
{
break;
}
if (used > SIZE_MAX - PYTHON_READLINE_BUFSIZE)
{
PyMem_RawFree(line);
line = NULL;
break;
}
linesize = used + PYTHON_READLINE_BUFSIZE;
tmp = PyMem_RawRealloc(line, linesize);
if (tmp == NULL)
{
PyMem_RawFree(line);
line = NULL;
break;
}
line = tmp;
}
#if defined(CONFIG_READLINE_TABCOMPLETION) || defined(CONFIG_READLINE_EDIT)
readline_prompt(oldprompt);
#endif
return line;
}
#endif
/****************************************************************************
* Name: check_and_mount_romfs
*
@ -194,6 +306,10 @@ int main(int argc, FAR char *argv[])
_pyruntime_early_init();
#ifdef CONFIG_SYSTEM_READLINE
PyOS_ReadlineFunctionPointer = python_readline;
#endif
setenv("PYTHONHOME", "/usr/local", 1);
setenv("PYTHON_BASIC_REPL", "1", 1);