It is often useful to show an error code to give the user a clue as to what went wrong. When error strings are compiled into U-Boot it is possible to show a message as well.
But at present it is not very convenient, since code must check if the error strings are present, then obtain the error string and use it in a printf() string.
Add a %dE option which shows an error code along with an error string, if available. This makes it easy to show one or both.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v1)
lib/vsprintf.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 530d8088c7f..8de3882fb6c 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -145,6 +145,7 @@ static noinline char *put_dec(char *buf, uint64_t num) #define LEFT 16 /* left justified */ #define SMALL 32 /* Must be 32 == 0x20 */ #define SPECIAL 64 /* 0x */ +#define ERRSTR 128 /* %dE showing error string if enabled */
/* * Macro to add a new character to our output string, but only if it will @@ -678,6 +679,8 @@ repeat: break;
case 'd': + if (fmt[1] == 'E') + flags |= ERRSTR; case 'i': flags |= SIGN; case 'u': @@ -712,6 +715,15 @@ repeat: } str = number(str, end, num, base, field_width, precision, flags); + if (IS_ENABLED(CONFIG_ERRNO_STR) && (flags & ERRSTR)) { + const char *p; + + ADDCH(str, ':'); + ADDCH(str, ' '); + for (p = errno_str(num); *p; p++) + ADDCH(str, *p); + fmt++; + } }
if (size > 0) {