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When the number of bytes written to the malloc'ed buffer is larger 

than the argument string size, copy as many bytes as will fit
(including a terminating '\0'), rather than not copying anything.
This to make it satisfy the C99 spec.
This commit is contained in:
Guido van Rossum 2001-12-01 16:00:10 +00:00
parent 82285dad8e
commit 64be0b4aa5
1 changed files with 5 additions and 5 deletions
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10
Python/mysnprintf.c
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@ -40,11 +40,11 @@ int myvsnprintf(char *str, size_t size, const char *format, va_list va)
assert(len >= 0);
if ((size_t)len > size + 512)
Py_FatalError("Buffer overflow in PyOS_snprintf/PyOS_vsnprintf");
if ((size_t)len > size) {
PyMem_Free(buffer);
return len - 1;
}
memcpy(str, buffer, len);
if ((size_t)len > size)
buffer[size-1] = '\0';
else
size = len;
memcpy(str, buffer, size);
PyMem_Free(buffer);
return len - 1;
}