Subject: [RFC PATCH v1 0/1] strbuf.c/h: add the constant version initialization method of strbuf

From: ZheNing Hu <[email-masked]>
Date: Tue, 5 Jan 2021 14:45:01 +0800

According to
https://public-inbox.org/git/[email-masked]/,
we can create a new way to initialize strbuf
with string constantto save the overhead of
dynamically allocated memory.The marco function
STRBUF_INIT_CONST(str).For example,STRBUF_ININ_DEFAULT("default")
will create a strbuf which buf eqoal to "default",
len eqoal to 7 and alloc eqoal to 0.This constant
strbuf will be changed to dynamic allocation when
we want to modify the contents of the constant buffer,
The function strbuf_const_to_no_const do this by change
buf with xstrdup,some function like strbuf_grow and
strbuf_setlen will use it,to change the strbuf
to a dynamically expand buffer.

My inference is based on an non-const strbuf
with alloc greater than 0 and len greater than 0,
const strbuf with alloc = 0 and len greater than 0.
But now it have some bug because of I don't know where
is the situation that non-const strbuf with 0 alloc
and more then 0 len,this is a bit out of my expectation.
So I fail check in gitgitgadget's check.
Who can give me some advice?

Thanks.

ZheNing Hu (1):
  strbuf.c/h: add the constant version initialization method of strbuf

 strbuf.c | 33 +++++++++++++++++++++++++++++----
 strbuf.h |  8 ++++++++
 2 files changed, 37 insertions(+), 4 deletions(-)

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2.30.0