[PATCH v2 05/18] tiny-printf: Correct return values

[Simon Glass]

The sprintf() etc. functions are supposed to return the length of the
string written, but do not. Fix this by checking the amount of buffer
space used.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 lib/tiny-printf.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index 9a70c6095b3..64dee779c4a 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -365,16 +365,15 @@ int sprintf(char *buf, const char *fmt, ...)
 {
 	struct printf_info info;
 	va_list va;
-	int ret;
 
 	va_start(va, fmt);
 	info.outstr = buf;
 	info.putc = putc_outstr;
-	ret = _vprintf(&info, fmt, va);
+	_vprintf(&info, fmt, va);
 	va_end(va);
 	*info.outstr = '\0';
 
-	return ret;
+	return info.outstr - buf;
 }
 
 #if CONFIG_IS_ENABLED(LOG)
@@ -382,14 +381,13 @@ int sprintf(char *buf, const char *fmt, ...)
 int vsnprintf(char *buf, size_t size, const char *fmt, va_list va)
 {
 	struct printf_info info;
-	int ret;
 
 	info.outstr = buf;
 	info.putc = putc_outstr;
-	ret = _vprintf(&info, fmt, va);
+	_vprintf(&info, fmt, va);
 	*info.outstr = '\0';
 
-	return ret;
+	return info.outstr - buf;
 }
 #endif
 
@@ -398,16 +396,15 @@ int snprintf(char *buf, size_t size, const char *fmt, ...)
 {
 	struct printf_info info;
 	va_list va;
-	int ret;
 
 	va_start(va, fmt);
 	info.outstr = buf;
 	info.putc = putc_outstr;
-	ret = _vprintf(&info, fmt, va);
+	_vprintf(&info, fmt, va);
 	va_end(va);
 	*info.outstr = '\0';
 
-	return ret;
+	return info.outstr - buf;
 }
 
 void print_grouped_ull(unsigned long long int_val, int digits)
-- 
2.43.0