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Date: Fri, 27 Aug 2021 20:13:02 +0200
From: Ismael Luceno <ismael@...ev.co.uk>
To: musl@...ts.openwall.com
Cc: Rich Felker <dalias@...c.org>
Subject: Re: [PATCH] glob: introduce context struct for do_glob
ignore this patch, it's garbage, I'll fix it
On 27/Aug/2021 20:08, Ismael Luceno wrote:
> this reduces the function frame by sharing more state in the recursion,
> and produces a slightly smaller object file with GCC 10.3 on x86_64:
>
> text data bss dec hex filename
> 2303 0 0 2303 8ff glob-ctx.lo
> 2356 0 0 2356 934 glob-noctx.lo
>
> Signed-off-by: Ismael Luceno <ismael@...ev.co.uk>
> ---
> src/regex/glob.c | 42 +++++++++++++++++++++++++++---------------
> 1 file changed, 27 insertions(+), 15 deletions(-)
>
> diff --git a/src/regex/glob.c b/src/regex/glob.c
> index 9de080ed9ccd..85e0f027b21a 100644
> --- a/src/regex/glob.c
> +++ b/src/regex/glob.c
> @@ -32,10 +32,16 @@ static int append(struct match **tail, const char *name, size_t len, int mark)
> return 0;
> }
>
> -static int do_glob(char *buf, size_t pos, int type, char *pat, int flags, int (*errfunc)(const char *path, int err), struct match **tail)
> +struct glob_ctx {
> + struct match **tail;
> + int flags;
> + int (*errfunc)(const char *path, int err);
> +};
> +
> +static int do_glob(char *buf, size_t pos, int type, char *pat, const struct glob_ctx *restrict ctx)
> {
> /* If GLOB_MARK is unused, we don't care about type. */
> - if (!type && !(flags & GLOB_MARK)) type = DT_REG;
> + if (!type && !(ctx->flags & GLOB_MARK)) type = DT_REG;
>
> /* Special-case the remaining pattern being all slashes, in
> * which case we can use caller-passed type if it's a dir. */
> @@ -55,7 +61,7 @@ static int do_glob(char *buf, size_t pos, int type, char *pat, int flags, int (*
> break;
> } else if (pat[i] == '[') {
> in_bracket = 1;
> - } else if (pat[i] == '\\' && !(flags & GLOB_NOESCAPE)) {
> + } else if (pat[i] == '\\' && !(ctx->flags & GLOB_NOESCAPE)) {
> /* Backslashes inside a bracket are (at least by
> * our interpretation) non-special, so if next
> * char is ']' we have a complete expression. */
> @@ -100,23 +106,23 @@ static int do_glob(char *buf, size_t pos, int type, char *pat, int flags, int (*
> * or if that fails, use lstat for determining existence to
> * avoid false negatives in the case of broken symlinks. */
> struct stat st;
> - if ((flags & GLOB_MARK) && (!type||type==DT_LNK) && !stat(buf, &st)) {
> + if ((ctx->flags & GLOB_MARK) && (!type||type==DT_LNK) && !stat(buf, &st)) {
> if (S_ISDIR(st.st_mode)) type = DT_DIR;
> else type = DT_REG;
> }
> if (!type && lstat(buf, &st)) {
> - if (errno!=ENOENT && (errfunc(buf, errno) || (flags & GLOB_ERR)))
> + if (errno!=ENOENT && (ctx->errfunc(buf, errno) || (ctx->flags & GLOB_ERR)))
> return GLOB_ABORTED;
> return 0;
> }
> - if (append(tail, buf, pos, (flags & GLOB_MARK) && type==DT_DIR))
> + if (append(ctx->tail, buf, pos, (ctx->flags & GLOB_MARK) && type==DT_DIR))
> return GLOB_NOSPACE;
> return 0;
> }
> char *p2 = strchr(pat, '/'), saved_sep = '/';
> /* Check if the '/' was escaped and, if so, remove the escape char
> * so that it will not be unpaired when passed to fnmatch. */
> - if (p2 && !(flags & GLOB_NOESCAPE)) {
> + if (p2 && !(ctx->flags & GLOB_NOESCAPE)) {
> char *p;
> for (p=p2; p>pat && p[-1]=='\\'; p--);
> if ((p2-p)%2) {
> @@ -126,7 +132,7 @@ static int do_glob(char *buf, size_t pos, int type, char *pat, int flags, int (*
> }
> DIR *dir = opendir(pos ? buf : ".");
> if (!dir) {
> - if (errfunc(buf, errno) || (flags & GLOB_ERR))
> + if (ctx->errfunc(buf, errno) || (ctx->flags & GLOB_ERR))
> return GLOB_ABORTED;
> return 0;
> }
> @@ -142,22 +148,22 @@ static int do_glob(char *buf, size_t pos, int type, char *pat, int flags, int (*
>
> if (p2) *p2 = 0;
>
> - int fnm_flags= ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)
> - | ((!(flags & GLOB_PERIOD)) ? FNM_PERIOD : 0);
> + int fnm_flags= ((ctx->flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)
> + | ((!(ctx->flags & GLOB_PERIOD)) ? FNM_PERIOD : 0);
>
> if (fnmatch(pat, de->d_name, fnm_flags))
> continue;
>
> /* With GLOB_PERIOD, don't allow matching . or .. unless
> * fnmatch would match them with FNM_PERIOD rules in effect. */
> - if (p2 && (flags & GLOB_PERIOD) && de->d_name[0]=='.'
> + if (p2 && (ctx->flags & GLOB_PERIOD) && de->d_name[0]=='.'
> && (!de->d_name[1] || de->d_name[1]=='.' && !de->d_name[2])
> && fnmatch(pat, de->d_name, fnm_flags | FNM_PERIOD))
> continue;
>
> memcpy(buf+pos, de->d_name, l+1);
> if (p2) *p2 = saved_sep;
> - int r = do_glob(buf, pos+l, de->d_type, p2 ? p2 : "", flags, errfunc, tail);
> + int r = do_glob(buf, pos+l, de->d_type, p2 ? p2 : "", ctx);
> if (r) {
> closedir(dir);
> return r;
> @@ -166,7 +172,7 @@ static int do_glob(char *buf, size_t pos, int type, char *pat, int flags, int (*
> int readerr = errno;
> if (p2) *p2 = saved_sep;
> closedir(dir);
> - if (readerr && (errfunc(buf, errno) || (flags & GLOB_ERR)))
> + if (readerr && (ctx->errfunc(buf, errno) || (ctx->flags & GLOB_ERR)))
> return GLOB_ABORTED;
> errno = old_errno;
> return 0;
> @@ -248,8 +254,14 @@ int glob(const char *restrict pat, int flags, int (*errfunc)(const char *path, i
> char *s = p;
> if ((flags & (GLOB_TILDE | GLOB_TILDE_CHECK)) && *p == '~')
> error = expand_tilde(&s, buf, &pos);
> - if (!error)
> - error = do_glob(buf, pos, 0, s, flags, errfunc, &tail);
> + if (!error) {
> + struct glob_ctx ctx = {
> + .tail = &tail,
> + .flags = flags,
> + .errfunc = errfunc,
> + };
> + error = do_glob(buf, pos, 0, s, &ctx);
> + }
> free(p);
> }
>
> --
> 2.33.0
>
--
Ismael Luceno
http://iodev.co.uk/
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