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Issue #25318: Avoid sprintf() in backslashreplace()

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Rewrite backslashreplace() to be closer to PyCodec_BackslashReplaceErrors().

Add also unit tests for non-BMP characters.
This commit is contained in:
Victor Stinner 2015-10-09 03:17:30 +02:00
parent b13b97d3b8
commit 797485e101
2 changed files with 22 additions and 9 deletions
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25
Objects/unicodeobject.c
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@ -610,14 +610,25 @@ backslashreplace(_PyBytesWriter *writer, Py_ssize_t prealloc_per_char,
/* generate replacement */
for (i = collstart; i < collend; ++i) {
ch = PyUnicode_READ(kind, data, i);
if (ch < 0x100)
str += sprintf(str, "\\x%02x", ch);
else if (ch < 0x10000)
str += sprintf(str, "\\u%04x", ch);
else {
assert(ch <= MAX_UNICODE);
str += sprintf(str, "\\U%08x", ch);
*str++ = '\\';
if (ch >= 0x00010000) {
*str++ = 'U';
*str++ = Py_hexdigits[(ch>>28)&0xf];
*str++ = Py_hexdigits[(ch>>24)&0xf];
*str++ = Py_hexdigits[(ch>>20)&0xf];
*str++ = Py_hexdigits[(ch>>16)&0xf];
*str++ = Py_hexdigits[(ch>>12)&0xf];
*str++ = Py_hexdigits[(ch>>8)&0xf];
}
else if (ch >= 0x100) {
*str++ = 'u';
*str++ = Py_hexdigits[(ch>>12)&0xf];
*str++ = Py_hexdigits[(ch>>8)&0xf];
}
else
*str++ = 'x';
*str++ = Py_hexdigits[(ch>>4)&0xf];
*str++ = Py_hexdigits[ch&0xf];
}
return str;
}