[xen staging] vsprintf: address violations of MISRA C:2012 Rule 16.3

[patchbot@xxxxxxx]

commit 6eeb3e86bdfa55874f4c44527551e9b82125dc83
Author:     Federico Serafini <federico.serafini@xxxxxxxxxxx>
AuthorDate: Thu Apr 4 12:01:50 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 4 12:01:50 2024 +0200

    vsprintf: address violations of MISRA C:2012 Rule 16.3
    
    MISRA C:2012 Rule 16.3 states: "An unconditional `break' statement
    shall terminate every switch-clause".
    
    In order to meet the requirements to deviate the rule:
    1) refactor the for loop to make the switch-clause ending with a
       return statement (note that adding a break at the end of the
       switch-clause would result in a violation of Rule 2.1
       "A project shall not contain unreachable code");
    2) add pseudo-keyword fallthrough.
    
    No functional change.
    
    Signed-off-by: Federico Serafini <federico.serafini@xxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/vsprintf.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/common/vsprintf.c b/xen/common/vsprintf.c
index c49631c0a4..612751c90f 100644
--- a/xen/common/vsprintf.c
+++ b/xen/common/vsprintf.c
@@ -377,7 +377,7 @@ static char *pointer(char *str, const char *end, const char 
**fmt_ptr,
             str = number(str, end, hex_buffer[i], 16, 2, -1, ZEROPAD);
 
             if ( ++i == field_width )
-                return str;
+                break;
 
             if ( sep )
             {
@@ -386,6 +386,8 @@ static char *pointer(char *str, const char *end, const char 
**fmt_ptr,
                 ++str;
             }
         }
+
+        return str;
     }
 
     case 'p': /* PCI SBDF. */
@@ -619,6 +621,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, 
va_list args)
 
         case 'X':
             flags |= LARGE;
+            fallthrough;
         case 'x':
             base = 16;
             break;
@@ -626,6 +629,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, 
va_list args)
         case 'd':
         case 'i':
             flags |= SIGN;
+            fallthrough;
         case 'u':
             break;
 
--
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