tools: xenalyze.c fix format-truncation

With gcc optimization enabled by:
tools: detect appropriate debug optimization level b43501451733193b265de30fd79a764363a2a473

-Wformat-truncation throws warnings

gcc version 7.3.0

xenalyze.c: In function 'find_symbol':
xenalyze.c:382:36: error: 'snprintf' output may be truncated before the last format character [-Werror=format-truncation=]

     snprintf(name, 128, "(%s +%llx)",
                                    ^
xenalyze.c:382:5: note: 'snprintf' output between 6 and 144 bytes into a destination of size 128
     snprintf(name, 128, "(%s +%llx)",
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              lastname, offset);
              ~~~~~~~~~~~~~~~~~

cc1: all warnings being treated as errors

---
 tools/xentrace/xenalyze.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 5768b54f86..5ed0a12327 100644
@@ -358,7 +358,7 @@ char * find_symbol(unsigned long long addr) {
     int i;
     char * lastname="ZERO";
     unsigned long long offset=addr;
-    static char name[128];
+    static char name[144];
 
     if(!p) {
         name[0]=0;

@@ -379,7 +379,7 @@ char * find_symbol(unsigned long long addr) {
         p=p->next;
     }
  finish:
-    snprintf(name, 128, "(%s +%llx)",
+    snprintf(name, 144, "(%s +%llx)",
              lastname, offset);
     return name;
 }

2.16.2


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It probably really wants to include SYMBOL_NAME_SIZE somewhere, but that's a minor clean-up for another day. :-)

Thanks!

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