[SeaBIOS] [PATCH] SeaBIOS: Fix bvprintf() to respect padding for hex printing.

From: Jes Sorensen

Fix bvprintf to respect space padding when printing hex numbers
and the caller specifies alignment without zero padding, eg. %2x
as opposed to %02x

Signed-off-by: Jes Sorensen 
---
 src/output.c |   27 +++++++++++++++++++++------
 1 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/src/output.c b/src/output.c
index 3de565a..a0d07e3 100644
--- a/src/output.c
+++ b/src/output.c
@@ -195,7 +195,7 @@ putsinglehex(struct putcinfo *action, u32 val)

// Output an integer in hexadecimal.
 static void
-puthex(struct putcinfo *action, u32 val, int width)
+puthex(struct putcinfo *action, u32 val, int width, int spacepad)
 {
     if (!width) {
         u32 tmp = val;
@@ -210,6 +210,17 @@ puthex(struct putcinfo *action, u32 val, int width)
         }
         if (tmp > 0xf)
             width += 1;
+    } else if (spacepad)  {
+        int count = 1;
+        u32 tmp = val;
+        while (tmp >>= 4) {
+            count++;
+        }
+        count = width - count;
+        width -= count;
+        while (count--) {
+            putc(action, ' ');
+        }
     }

switch (width) {
@@ -244,11 +255,15 @@ bvprintf(struct putcinfo *action, const char *fmt, va_list args)
         }
         const char *n = s+1;
         int field_width = 0;
+        int spacepad = 1;
         for (;;) {
             c = GET_GLOBAL(*(u8*)n);
             if (!isdigit(c))
                 break;
-            field_width = field_width * 10 + c - '0';
+            if (!field_width && (c == '0'))
+                spacepad = 0;
+            else
+                field_width = field_width * 10 + c - '0';
             n++;
         }
         if (c == 'l') {
@@ -281,7 +296,7 @@ bvprintf(struct putcinfo *action, const char *fmt, va_list args)
             field_width = 8;
         case 'x':
             val = va_arg(args, s32);
-            puthex(action, val, field_width);
+            puthex(action, val, field_width, spacepad);
             break;
         case 'c':
             val = va_arg(args, int);
@@ -333,7 +348,7 @@ __dprintf(const char *fmt, ...)
         if (cur != &MainThread) {
             // Show "thread id" for this debug message.
             putc_debug(&debuginfo, '|');
-            puthex(&debuginfo, (u32)cur, 8);
+            puthex(&debuginfo, (u32)cur, 8, 0);
             putc_debug(&debuginfo, '|');
             putc_debug(&debuginfo, ' ');
         }
@@ -411,12 +426,12 @@ hexdump(const void *d, int len)
     while (len > 0) {
         if (count % 8 == 0) {
             putc(&debuginfo, '\n');
-            puthex(&debuginfo, count*4, 8);
+            puthex(&debuginfo, count*4, 8, 0);
             putc(&debuginfo, ':');
         } else {
             putc(&debuginfo, ' ');
         }
-        puthex(&debuginfo, *(u32*)d, 8);
+        puthex(&debuginfo, *(u32*)d, 8, 0);
         count++;
         len-=4;
         d+=4;