src/bin/sh/memalloc.h, branch stable/14

Remove $FreeBSD$: one-line .h pattern

2023-08-16T17:54:23Z

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

General further adoption of SPDX licensing ID tags.

2017-11-20T19:49:47Z

Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.

Renumber copyright clause 4

2017-02-28T23:42:47Z

Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann Pull Request: https://github.com/freebsd/freebsd/pull/96

sh: Add stsavestr(), like savestr() but allocates using stalloc().

2015-02-15T21:41:29Z

sh: Remove linked list of stack marks.

2013-05-11T20:51:00Z

The linked list of stack marks may cause problems if the allocation stack is used between an exception and a higher-level popstackmark(), as it may then touch a stack mark that is local to a function which has returned. Also, the adjustment compares to a pointer passed to realloc(), which is undefined behaviour. Instead of adjusting stack marks when reallocating stack blocks, ensure that such an adjustment is never necessary by fixing a small piece of memory in place at a stack mark. This also simplifies the code. To avoid the problems reported in bin/175922, it remains necessary to call setstackmark() after popstackmark() if the stack mark remains in use.

sh: Fix various compiler warnings.

2013-04-01T17:18:22Z

It now passes WARNS=7 with clang on i386. GCC 4.2.1 does not understand setjmp() properly so will always trigger -Wuninitialized. I will not add the volatile keywords to suppress this.

sh: Follow-up to r216743, grabstackblock() can be replaced with stalloc().

2011-01-09T22:47:58Z

grabstackblock() was used only once (but it is a very often executed piece of code).

sh: Simplify "stack string" code slightly.

2010-12-27T22:18:27Z

Maintain a pointer to the end of the stack string area instead of how much space is left. This simplifies the macros in memalloc.h. The places where the new variable must be updated are only where the memory area is created, destroyed or resized.

sh: Allow arbitrary large numbers in CHECKSTRSPACE.

2010-12-26T13:25:47Z

Reduce "stack string" API somewhat and simplify code. Add a check for integer overflow of the "stack string" length (probably incomplete).

sh: Remove the herefd hack.

2010-12-12T00:07:27Z

The herefd hack wrote out partial here documents while expanding them. It seems unnecessary complication given that other expansions just allocate memory. It causes bugs because the stack is also used for intermediate results such as arithmetic expressions. Such places should disable herefd for the duration but not all of them do, and I prefer removing the need for disabling herefd to disabling it everywhere needed. Here documents larger than 1024 bytes will use a bit more CPU time and memory. Additionally this allows a later change to expand here documents in the current shell environment. (This is faster for small here documents but also changes behaviour.) Obtained from: dash