diff options
Diffstat (limited to 'os/hal')
| -rw-r--r-- | os/hal/lib/streams/chprintf.c | 46 | ||||
| -rw-r--r-- | os/hal/lib/streams/chprintf.h | 1 |
2 files changed, 43 insertions, 4 deletions
diff --git a/os/hal/lib/streams/chprintf.c b/os/hal/lib/streams/chprintf.c index 50b1ed75e..ba622446c 100644 --- a/os/hal/lib/streams/chprintf.c +++ b/os/hal/lib/streams/chprintf.c @@ -339,6 +339,45 @@ int chprintf(BaseSequentialStream *chp, const char *fmt, ...) { */
int chsnprintf(char *str, size_t size, const char *fmt, ...) {
va_list ap;
+ int retval;
+
+ /* Performing the print operation.*/
+ va_start(ap, fmt);
+ retval = chvsnprintf(str, size, fmt, ap);
+ va_end(ap);
+
+ /* Return number of bytes that would have been written.*/
+ return retval;
+}
+
+/**
+ * @brief System formatted output function.
+ * @details This function implements a minimal @p vsnprintf()-like functionality.
+ * The general parameters format is: %[-][width|*][.precision|*][l|L]p.
+ * The following parameter types (p) are supported:
+ * - <b>x</b> hexadecimal integer.
+ * - <b>X</b> hexadecimal long.
+ * - <b>o</b> octal integer.
+ * - <b>O</b> octal long.
+ * - <b>d</b> decimal signed integer.
+ * - <b>D</b> decimal signed long.
+ * - <b>u</b> decimal unsigned integer.
+ * - <b>U</b> decimal unsigned long.
+ * - <b>c</b> character.
+ * - <b>s</b> string.
+ * .
+ * @post @p str is NUL-terminated, unless @p size is 0.
+ *
+ * @param[in] str pointer to a buffer
+ * @param[in] size maximum size of the buffer
+ * @param[in] ap list of parameters
+ * @return The number of characters (excluding the
+ * terminating NUL byte) that would have been
+ * stored in @p str if there was room.
+ *
+ * @api
+ */
+int chvsnprintf(char *str, size_t size, const char *fmt, va_list ap) {
MemoryStream ms;
BaseSequentialStream *chp;
size_t size_wo_nul;
@@ -355,13 +394,12 @@ int chsnprintf(char *str, size_t size, const char *fmt, ...) { /* Performing the print operation using the common code.*/
chp = (BaseSequentialStream *)(void *)&ms;
- va_start(ap, fmt);
retval = chvprintf(chp, fmt, ap);
- va_end(ap);
/* Terminate with a zero, unless size==0.*/
- if (ms.eos < size)
- str[ms.eos] = 0;
+ if (ms.eos < size) {
+ str[ms.eos] = 0;
+ }
/* Return number of bytes that would have been written.*/
return retval;
diff --git a/os/hal/lib/streams/chprintf.h b/os/hal/lib/streams/chprintf.h index 19774eaab..833ac27f4 100644 --- a/os/hal/lib/streams/chprintf.h +++ b/os/hal/lib/streams/chprintf.h @@ -40,6 +40,7 @@ extern "C" { int chvprintf(BaseSequentialStream *chp, const char *fmt, va_list ap);
int chprintf(BaseSequentialStream *chp, const char *fmt, ...);
int chsnprintf(char *str, size_t size, const char *fmt, ...);
+ int chvsnprintf(char *str, size_t size, const char *fmt, va_list ap);
#ifdef __cplusplus
}
#endif
|