[issue30943] printf-style Bytes Formatting sometimes do not worked.

[R. David Murray]

Changes by R. David Murray :


--
resolution:  -> out of date
stage:  -> resolved
status: open -> closed
superseder:  -> can't interpolate byte string with \x00 before replacement 
identifier

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[issue30943] printf-style Bytes Formatting sometimes do not worked.

[Gareth Rees]

Gareth Rees added the comment:

This was already noted in issue29714 and fixed by Xiang Zhang in commit 
b76ad5121e2.

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[issue30943] printf-style Bytes Formatting sometimes do not worked.

[Gareth Rees]

Gareth Rees added the comment:

Test case minimization:

Python 3.6.1 (default, Apr 24 2017, 06:18:27) 
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> b'a\x00%(a)s' % {b'a': b'a'}
b'a\x00%(a)s'

It seems that all formatting operations after a zero byte are ignored. This is 
because the code for parsing the format string (in _PyBytes_FormatEx in 
Objects/bytesobject.c) uses the following approach to find the next % character:

while (--fmtcnt >= 0) {
if (*fmt != '%') {
Py_ssize_t len;
char *pos;
pos = strchr(fmt + 1, '%');

But strchr uses the C notion of strings, which are terminated by a zero byte.

--
nosy: +g...@garethrees.org

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[issue30943] printf-style Bytes Formatting sometimes do not worked.

[zaazbb]

New submission from zaazbb:

# works.
>>> b'\x00\x08%(amount)b'% {b'amount':b'1'}
b'\x00\x081'
# not work.
>>> b'\x11\x00\x08%(amount)b'% {b'amount':b'1'}
b'\x11\x00\x08%(amount)b'

# not work.
>>> amount=bytearray(b'0010')
>>> posnum=bytearray(b'423')
>>> date_ =b'170717'
>>> time_=b'160006'
>>> b'\x02\x03\x13\x9f\x00\x00\x04NULL\x9f\x01\x00\x01\x02\x9f\x03\x00\x0c\xd6\xd0\xb9\xfa\xd2\xf8\xc1\xaa\xb2\xe2\xca\xd4\x9f\x04\x00\x0f307310083980007\x9f\x05\x00\x0814025520\x9f\x14\x00\x0200\x9f\x19\x00\x08\xbd\xbb\xd2\xd7\xb3\xc9\xb9\xa6\x9f\x07\x00\x0803072900\x9f\x08\x00\n0014243000\x9f\t\x00\x08\xbd\xf0\xbf\xa8\xd6\xd0\xd0\xc4\x9f\n\x00\x0800092900\x9f\r\x00\x06000145\x9f\x0e\x00\x0681\x9f\x10\x00\x0c162246168268\x9f\x11\x00\x08%(date)s\x9f\x12\x00\x06%(time)s\x9f\x02\x00\x0c%(amount)s\x9f\x1b\x00\x04\x9f\x0b\x00\x13622452*2994\x9f\x0c\x00\x01S\x9f\x0f\x00\x00\x9f\x13\x00.FK:\xbb\xb7\xd3\xce\xd1\xc7\xcc\xab\xb3\xa9\xcf\xed\xd2\xf8\xc1\xaa\xd3\xc5\xbb\xdd\nZX:promo.unionpay.com\n\x9f\x1f\x00\x03%(posnum)s\x9f\x1a\x00\x00\x9f\xa1\x00\x01\x01\x9f\xa0\x00\x01\x01\x03\x00'%
>>>  {b'amount': amount,b'date': date_,b'time': time_,b'posnum': posnum}
b'\x02\x03\x13\x9f\x00\x00\x04NULL\x9f\x01\x00\x01\x02\x9f\x03\x00\x0c\xd6\xd0\xb9\xfa\xd2\xf8\xc1\xaa\xb2\xe2\xca\xd4\x9f\x04\x00\x0f307310083980007\x9f\x05\x00\x0814025520\x9f\x14\x00\x0200\x9f\x19\x00\x08\xbd\xbb\xd2\xd7\xb3\xc9\xb9\xa6\x9f\x07\x00\x0803072900\x9f\x08\x00\n0014243000\x9f\t\x00\x08\xbd\xf0\xbf\xa8\xd6\xd0\xd0\xc4\x9f\n\x00\x0800092900\x9f\r\x00\x06000145\x9f\x0e\x00\x0681\x9f\x10\x00\x0c162246168268\x9f\x11\x00\x08%(date)s\x9f\x12\x00\x06%(time)s\x9f\x02\x00\x0c%(amount)s\x9f\x1b\x00\x04\x9f\x0b\x00\x13622452*2994\x9f\x0c\x00\x01S\x9f\x0f\x00\x00\x9f\x13\x00.FK:\xbb\xb7\xd3\xce\xd1\xc7\xcc\xab\xb3\xa9\xcf\xed\xd2\xf8\xc1\xaa\xd3\xc5\xbb\xdd\nZX:promo.unionpay.com\n\x9f\x1f\x00\x03%(posnum)s\x9f\x1a\x00\x00\x9f\xa1\x00\x01\x01\x9f\xa0\x00\x01\x01\x03\x00'

Environment:
Python 3.6.1
Windows 10 64bit.

--
components: Library (Lib)
messages: 298465
nosy: zaazbb
priority: normal
severity: normal
status: open
title: printf-style Bytes Formatting sometimes do not worked.
type: behavior
versions: Python 3.6

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