From 5e0579812834ab7fa072db4a15ebdff68d62e2e7 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Tue, 26 Oct 2010 14:22:50 -0700 Subject: [PATCH] vsprintf.c: use default pointer field size for "(null)" strings It might be nicer to align the output. For instance, ACPI messages sometimes have "(null)" pointers. $ dmesg | grep "(null)" -A 1 -B 1 [ 0.198733] ACPI: Dynamic OEM Table Load: [ 0.198745] ACPI: SSDT (null) 00239 (v02 PmRef Cpu0Ist 00003000 INTL 20051117) [ 0.199294] ACPI: SSDT 7f596e10 001C7 (v02 PmRef Cpu0Cst 00003001 INTL 20051117) [ 0.200708] ACPI: Dynamic OEM Table Load: [ 0.200721] ACPI: SSDT (null) 001C7 (v02 PmRef Cpu0Cst 00003001 INTL 20051117) [ 0.201950] ACPI: SSDT 7f597f10 000D0 (v02 PmRef Cpu1Ist 00003000 INTL 20051117) [ 0.203386] ACPI: Dynamic OEM Table Load: [ 0.203398] ACPI: SSDT (null) 000D0 (v02 PmRef Cpu1Ist 00003000 INTL 20051117) [ 0.203871] ACPI: SSDT 7f595f10 00083 (v02 PmRef Cpu1Cst 00003000 INTL 20051117) [ 0.205301] ACPI: Dynamic OEM Table Load: [ 0.205315] ACPI: SSDT (null) 00083 (v02 PmRef Cpu1Cst 00003000 INTL 20051117) [akpm@linux-foundation.org: add code comment] Signed-off-by: Joe Perches Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/vsprintf.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 7af9d841c43b..8378c136b6e1 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -988,8 +988,15 @@ static noinline_for_stack char *pointer(const char *fmt, char *buf, char *end, void *ptr, struct printf_spec spec) { - if (!ptr) + if (!ptr) { + /* + * Print (null) with the same width as a pointer so it makes + * tabular output look nice. + */ + if (spec.field_width == -1) + spec.field_width = 2 * sizeof(void *); return string(buf, end, "(null)", spec); + } switch (*fmt) { case 'F': @@ -1031,7 +1038,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, } spec.flags |= SMALL; if (spec.field_width == -1) { - spec.field_width = 2*sizeof(void *); + spec.field_width = 2 * sizeof(void *); spec.flags |= ZEROPAD; } spec.base = 16; -- GitLab