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Message-Id: <20210827180821.32487-1-ismael@iodev.co.uk>
Date: Fri, 27 Aug 2021 20:08:21 +0200
From: Ismael Luceno <ismael@...ev.co.uk>
To: musl@...ts.openwall.com
Cc: Rich Felker <dalias@...c.org>,
Ismael Luceno <ismael@...ev.co.uk>
Subject: [PATCH] glob: introduce context struct for do_glob
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
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