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Date: Fri, 31 Jul 2020 15:31:43 +0300 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Petr Mladek <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, linux-kernel@...r.kernel.org, Rasmus Villemoes <linux@...musvillemoes.dk> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Subject: [PATCH v1 1/3] lib/vsprintf: Replace hidden BUILD_BUG_ON() with static_assert() First of all, there is no compile time check for the SMALL to be ' ' (0x20, i.e. space). Second, for ZEROPAD the check is hidden in the code. For better maintenance replace BUILD_BUG_ON() with static_assert() for ZEROPAD and move it closer to the definition. While at it, introduce check for SMALL. Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> --- lib/vsprintf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 31a674dd2674..8a8ac7ce0289 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -381,6 +381,9 @@ int num_to_str(char *buf, int size, unsigned long long num, unsigned int width) #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ +static_assert(ZEROPAD + ' ' == '0'); +static_assert(SMALL == ' '); + enum format_type { FORMAT_TYPE_NONE, /* Just a string part */ FORMAT_TYPE_WIDTH, @@ -507,7 +510,7 @@ char *number(char *buf, char *end, unsigned long long num, /* zero or space padding */ if (!(spec.flags & LEFT)) { char c = ' ' + (spec.flags & ZEROPAD); - BUILD_BUG_ON(' ' + ZEROPAD != '0'); + while (--field_width >= 0) { if (buf < end) *buf = c; -- 2.27.0
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