Karthik Nayak <karthik....@gmail.com> writes:
> The current implementation of 'strbuf_split_buf()' includes the
> terminator at the end of each strbuf post splitting. Add an option
> wherein we can drop the terminator if desired. In this context
> introduce a wrapper function 'strbuf_split_str_omit_term()' which
> splits a given string into strbufs without including the terminator.
>
> Helped-by: Eric Sunshine <sunsh...@sunshineco.com>
> Signed-off-by: Karthik Nayak <karthik....@gmail.com>
> ---
> strbuf.c | 7 ++++---
> strbuf.h | 25 ++++++++++++++++---------
> 2 files changed, 20 insertions(+), 12 deletions(-)
>
> diff --git a/strbuf.c b/strbuf.c
> index b552a13..b62508e 100644
> --- a/strbuf.c
> +++ b/strbuf.c
> @@ -115,7 +115,7 @@ void strbuf_tolower(struct strbuf *sb)
> }
>
> struct strbuf **strbuf_split_buf(const char *str, size_t slen,
> - int terminator, int max)
> + int terminator, int max, int omit_term)
> {
> struct strbuf **ret = NULL;
> size_t nr = 0, alloc = 0;
> @@ -123,14 +123,15 @@ struct strbuf **strbuf_split_buf(const char *str,
> size_t slen,
>
> while (slen) {
> int len = slen;
> + const char *end = NULL;
> if (max <= 0 || nr + 1 < max) {
> - const char *end = memchr(str, terminator, slen);
> + end = memchr(str, terminator, slen);
> if (end)
> len = end - str + 1;
> }
> t = xmalloc(sizeof(struct strbuf));
> strbuf_init(t, len);
> - strbuf_add(t, str, len);
> + strbuf_add(t, str, len - !!end * !!omit_term);
You initialize with "len" but sometimes copy less than that, which
looks somewhat sloppy.
Maybe I am old-fashioned, but use of a multiplication when you do
not mean to numerically multiply but merely to perform a logical
operation made me go "Huh?".
Perhaps using another variable would make it easier to follow?
Either using a boolean that tells us that the terminating byte
is to be omitted, i.e.
int len = slen;
int omit = 0;
if ( ... we are still splitting ... ) {
const char *end = memchr(...);
if (end) {
len = end - str + 1;
omit = !!omit_term;
}
}
strbuf_init(t, len - omit);
strbuf_add(t, str, len - omit);
or an integer "copylen" that tells us how many bytes to copy, which
often is the same as "len" but sometimes different by 1 byte?
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