feat(printf): add atomic_printf (#50)

OpenXiangShan · Dec 26, 2024 · c5d690d · c5d690d
1 parent 74bbc7f
commit c5d690d
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Showing 2 changed files with 22 additions and 1 deletion.
diff --git a/libs/klib/include/printf.h b/libs/klib/include/printf.h
@@ -60,6 +60,12 @@ void _putchar(char character);
 #define printf printf_
 int printf_(const char* format, ...);
 
+/**
+ * Atomic version of printf
+ */
+#define atomic_printf atomic_printf_
+int atomic_printf_(const char* format, ...);
+
 
 /**
  * Tiny sprintf implementation

diff --git a/libs/klib/src/printf.c b/libs/klib/src/printf.c
@@ -859,10 +859,20 @@ static int _vsnprintf(out_fct_type out, char* buffer, const size_t maxlen, const
 
 ///////////////////////////////////////////////////////////////////////////////
 #ifndef NOPRINT
+int printf_(const char* format, ...)
+{
+  va_list va;
+  va_start(va, format);
+  char buffer[1];
+  const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
+  va_end(va);
+  return ret;
+}
+
 void lock(volatile uint64_t *);
 void release(volatile uint64_t *);
 volatile uint64_t print_lock = 0;
-int printf_(const char* format, ...)
+int atomic_printf_(const char* format, ...)
 {
   va_list va;
   lock(&print_lock);
@@ -878,6 +888,11 @@ int printf_(const char* format, ...)
 {
   return 0;
 }
+
+int atomic_printf_(const char *format, ...)
+{
+  return 0;
+}
 #endif