Re: [PATCH v2 1/4] Add cleaner line-by-line reading primitives

On Mon, Jun 27, 2022 at 12:36:32PM +0200, Stefano Brivio wrote:

On Fri, 24 Jun 2022 12:17:29 +1000 David Gibson wrote:

...

[...]

+/** + * lineread_get() - Read a single line from file (no allocation) + * @lr: Line reader state structure + * @line: Place a pointer to the next line in this variable + * + * Return: Length of line read on success, 0 on EOF, negative on error + */ +int lineread_get(struct lineread *lr, char **line) +{ + bool eof = false; + int line_len; + + while ((line_len = peek_line(lr, eof)) < 0) { + int rc; + + if ((lr->next_line + lr->count) == LINEREAD_BUFFER_SIZE) { + /* No space at end */ + if (lr->next_line == 0) { + /* Buffer is full, which means we've + * hit a line too long for us to + * process. FIXME: report error + * better + */ + return -1; + } + memmove(lr->buf, lr->buf + lr->next_line, lr->count); + lr->next_line = 0; + } + + /* Read more data into the end of buffer */ + rc = read(lr->fd, lr->buf + lr->next_line + lr->count, + LINEREAD_BUFFER_SIZE - lr->next_line - lr->count); + if (rc < 0) { + return rc; + } else if (rc == 0) {

clang-tidy still complains about this one, and I think it's reasonable (though not fundamental) to change it, because (rc < 0) is a clear error condition we're returning right away. I'd just change this on merge.

Fair enough. -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson