From 79ec7d375a4cc969a7e2ee36edca52074fa71219 Mon Sep 17 00:00:00 2001
From: Rahix <rahix@rahix.de>
Date: Mon, 29 Jul 2019 18:05:11 +0200
Subject: [PATCH] fix(pycardium): Fix stubbed snprintf messing up readline
Signed-off-by: Rahix <rahix@rahix.de>
---
pycardium/patch.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/pycardium/patch.c b/pycardium/patch.c
index 902653ec..bf85e5bd 100644
--- a/pycardium/patch.c
+++ b/pycardium/patch.c
@@ -49,8 +49,22 @@ int puts(const char *s)
/* Used by mp_hal_move_cursor_back() */
int snprintf(char *str, size_t size, const char *format, ...)
{
- /* TODO: What should we do with this? */
- return -EIO;
+ /*
+ * There is one known place where snprintf is used: The
+ * mp_hal_move_cursor_back() function from mp-readline.
+ * This stub implementation just implements printf for
+ * that one case.
+ */
+ if (format[0] != '\x1B' || size != 6) {
+ return -EIO;
+ }
+
+ va_list ap;
+ va_start(ap, format);
+ printf("\x1B[%uD", va_arg(ap, unsigned int));
+ va_end(ap);
+
+ return -1;
}
/* Use by assert() */
--
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