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-rw-r--r--Objects/stringobject.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/Objects/stringobject.c b/Objects/stringobject.c
index 3acc69f..9ea32a2 100644
--- a/Objects/stringobject.c
+++ b/Objects/stringobject.c
@@ -269,6 +269,14 @@ PyString_FromFormatV(const char *format, va_list vargs)
break;
case 'p':
sprintf(s, "%p", va_arg(vargs, void*));
+ /* %p is ill-defined: ensure leading 0x. */
+ if (s[1] == 'X')
+ s[1] = 'x';
+ else if (s[1] != 'x') {
+ memmove(s+2, s, strlen(s)+1);
+ s[0] = '0';
+ s[1] = 'x';
+ }
s += strlen(s);
break;
case '%':