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Use PyOS_vsnprintf() and check its return value. 

If it returns -1 (which indicates overflow on old Linux platforms and
perhaps on Windows) or size greater than buffer, write a message
indicating that the previous message was truncated.
This commit is contained in:
Jeremy Hylton 2001-11-28 21:44:53 +00:00
parent 4b4ab20f2c
commit 5d3d134d56
1 changed files with 9 additions and 2 deletions
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11
Python/sysmodule.c
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@ -1023,12 +1023,19 @@ mywrite(char *name, FILE *fp, const char *format, va_list va)
vfprintf(fp, format, va);
else {
char buffer[1001];
if (vsprintf(buffer, format, va) >= sizeof(buffer))
Py_FatalError("PySys_WriteStdout/err: buffer overrun");
int written = PyOS_vsnprintf(buffer, sizeof(buffer),
format, va);
if (PyFile_WriteString(buffer, file) != 0) {
PyErr_Clear();
fputs(buffer, fp);
}
if (written == -1 || written > sizeof(buffer)) {
const char *truncated = "... truncated";
if (PyFile_WriteString(truncated, file) != 0) {
PyErr_Clear();
fputs(truncated, fp);
}
}
}
PyErr_Restore(error_type, error_value, error_traceback);
}