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Add reminder to dtoa.c to check for updates regularly.

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Fix a bug in the memory management in dtoa.c.
This commit is contained in:
Mark Dickinson 2009-04-17 16:06:28 +00:00
parent f633ff4546
commit 7f0ea323ee
1 changed files with 10 additions and 2 deletions
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12
Python/dtoa.c
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@ -21,7 +21,11 @@
* This is dtoa.c by David M. Gay, downloaded from * This is dtoa.c by David M. Gay, downloaded from
* http://www.netlib.org/fp/dtoa.c on April 15, 2009 and modified for * http://www.netlib.org/fp/dtoa.c on April 15, 2009 and modified for
* inclusion into the Python core by Mark E. T. Dickinson and Eric V. Smith. * inclusion into the Python core by Mark E. T. Dickinson and Eric V. Smith.
* The major modifications are as follows: *
* Please remember to check http://www.netlib.org/fp regularly (and especially
* before any Python release) for bugfixes and updates.
*
* The major modifications from Gay's original code are as follows:
* *
* 0. The original code has been specialized to Python's needs by removing * 0. The original code has been specialized to Python's needs by removing
* many of the #ifdef'd sections. In particular, code to support VAX and * many of the #ifdef'd sections. In particular, code to support VAX and
@ -53,6 +57,10 @@
* 5. The code has been reformatted to better fit with Python's * 5. The code has been reformatted to better fit with Python's
* C style guide (PEP 7). * C style guide (PEP 7).
* *
* 6. A bug in the memory allocation has been fixed: to avoid FREEing memory
* that hasn't been MALLOC'ed, private_mem should only be used when k <=
* Kmax.
*
***************************************************************/ ***************************************************************/
/* Please send bug reports for the original dtoa.c code to David M. Gay (dmg /* Please send bug reports for the original dtoa.c code to David M. Gay (dmg
@ -342,7 +350,7 @@ Balloc(int k)
x = 1 << k; x = 1 << k;
len = (sizeof(Bigint) + (x-1)*sizeof(ULong) + sizeof(double) - 1) len = (sizeof(Bigint) + (x-1)*sizeof(ULong) + sizeof(double) - 1)
/sizeof(double); /sizeof(double);
if (pmem_next - private_mem + len <= PRIVATE_mem) { if (k <= Kmax && pmem_next - private_mem + len <= PRIVATE_mem) {
rv = (Bigint*)pmem_next; rv = (Bigint*)pmem_next;
pmem_next += len; pmem_next += len;
} }