[PATCH 2/7] vsprintf: add %pR support for IRQ and DMA resources

[Bjorn Helgaas <bjorn.helgaas@hp.com>]

Print addresses (IO port numbers and memory addresses) in hex, but print
others (IRQs and DMA channels) in decimal.  Only print the end if it's
different from the start.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
---
 lib/vsprintf.c |   31 +++++++++++++++++++++----------
 1 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7830576..1b60aed 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -604,26 +604,37 @@ static char *resource_string(char *buf, char *end, struct resource *res,
 #ifndef MEM_RSRC_PRINTK_SIZE
 #define MEM_RSRC_PRINTK_SIZE	10
 #endif
-	struct printf_spec num_spec = {
+	struct printf_spec hex_spec = {
 		.base = 16,
 		.precision = -1,
 		.flags = SPECIAL | SMALL | ZEROPAD,
 	};
-	/* room for the actual numbers, the two "0x", -, [, ] and the final zero */
-	char sym[4*sizeof(resource_size_t) + 8];
+	struct printf_spec dec_spec = {
+		.base = 10,
+		.precision = -1,
+		.flags = 0,
+	};
+	/* room for two actual numbers (decimal or hex), the two "0x", -, [, ]
+	 * and the final zero */
+	char sym[2*3*sizeof(resource_size_t) + 8];
 	char *p = sym, *pend = sym + sizeof(sym);
-	int size = -1;
+	int size = -1, addr = 0;
 
-	if (res->flags & IORESOURCE_IO)
+	if (res->flags & IORESOURCE_IO) {
 		size = IO_RSRC_PRINTK_SIZE;
-	else if (res->flags & IORESOURCE_MEM)
+		addr = 1;
+	} else if (res->flags & IORESOURCE_MEM) {
 		size = MEM_RSRC_PRINTK_SIZE;
+		addr = 1;
+	}
 
 	*p++ = '[';
-	num_spec.field_width = size;
-	p = number(p, pend, res->start, num_spec);
-	*p++ = '-';
-	p = number(p, pend, res->end, num_spec);
+	hex_spec.field_width = size;
+	p = number(p, pend, res->start, addr ? hex_spec : dec_spec);
+	if (res->start != res->end) {
+		*p++ = '-';
+		p = number(p, pend, res->end, addr ? hex_spec : dec_spec);
+	}
 	*p++ = ']';
 	*p = 0;