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From b91cdbe2bc8b626aa04dc6e3e84345accf34e4b1 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 15 Nov 2014 12:16:19 -0500
Subject: [PATCH] fix behavior of printf with alt-form octal, zero precision,
zero value
in this case there are two conflicting rules in play: that an explicit
precision of zero with the value zero produces no output, and that the
'#' modifier for octal increases the precision sufficiently to yield a
leading zero. ISO C (7.19.6.1 paragraph 6 in C99+TC3) includes a
parenthetical remark to clarify that the precision-increasing behavior
takes precedence, but the corresponding text in POSIX off of which I
based the implementation is missing this remark.
this issue was covered in WG14 DR#151.
---
src/stdio/vfprintf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
index ea25772..39c1e86 100644
--- a/src/stdio/vfprintf.c
+++ b/src/stdio/vfprintf.c
@@ -570,7 +570,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
if (0) {
case 'o':
a = fmt_o(arg.i, z);
- if ((fl&ALT_FORM) && arg.i) prefix+=5, pl=1;
+ if ((fl&ALT_FORM) && p<z-a+1) p=z-a+1;
} if (0) {
case 'd': case 'i':
pl=1;
--
2.2.0
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