1 files changed, 317 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/regex/glob.c b/libc-top-half/musl/src/regex/glob.c
new file mode 100644
index 0000000..78063a4
--- /dev/null
+++ b/libc-top-half/musl/src/regex/glob.c
@@ -0,0 +1,317 @@
+#define _BSD_SOURCE
+#include <glob.h>
+#include <fnmatch.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stddef.h>
+#include <unistd.h>
+#ifdef __wasilibc_unmodified_upstream // WASI has no usernames
+#include <pwd.h>
+#endif
+
+struct match
+{
+	struct match *next;
+	char name[];
+};
+
+static int append(struct match **tail, const char *name, size_t len, int mark)
+{
+	struct match *new = malloc(sizeof(struct match) + len + 2);
+	if (!new) return -1;
+	(*tail)->next = new;
+	new->next = NULL;
+	memcpy(new->name, name, len+1);
+	if (mark && len && name[len-1]!='/') {
+		new->name[len] = '/';
+		new->name[len+1] = 0;
+	}
+	*tail = new;
+	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)
+{
+	/* If GLOB_MARK is unused, we don't care about type. */
+	if (!type && !(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. */
+	if (*pat && type!=DT_DIR) type = 0;
+	while (pos+1 < PATH_MAX && *pat=='/') buf[pos++] = *pat++;
+
+	/* Consume maximal [escaped-]literal prefix of pattern, copying
+	 * and un-escaping it to the running buffer as we go. */
+	ptrdiff_t i=0, j=0;
+	int in_bracket = 0, overflow = 0;
+	for (; pat[i]!='*' && pat[i]!='?' && (!in_bracket || pat[i]!=']'); i++) {
+		if (!pat[i]) {
+			if (overflow) return 0;
+			pat += i;
+			pos += j;
+			i = j = 0;
+			break;
+		} else if (pat[i] == '[') {
+			in_bracket = 1;
+		} else if (pat[i] == '\\' && !(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. */
+			if (in_bracket && pat[i+1]==']') break;
+			/* Unpaired final backslash never matches. */
+			if (!pat[i+1]) return 0;
+			i++;
+		}
+		if (pat[i] == '/') {
+			if (overflow) return 0;
+			in_bracket = 0;
+			pat += i+1;
+			i = -1;
+			pos += j+1;
+			j = -1;
+		}
+		/* Only store a character if it fits in the buffer, but if
+		 * a potential bracket expression is open, the overflow
+		 * must be remembered and handled later only if the bracket
+		 * is unterminated (and thereby a literal), so as not to
+		 * disallow long bracket expressions with short matches. */
+		if (pos+(j+1) < PATH_MAX) {
+			buf[pos+j++] = pat[i];
+		} else if (in_bracket) {
+			overflow = 1;
+		} else {
+			return 0;
+		}
+		/* If we consume any new components, the caller-passed type
+		 * or dummy type from above is no longer valid. */
+		type = 0;
+	}
+	buf[pos] = 0;
+	if (!*pat) {
+		/* If we consumed any components above, or if GLOB_MARK is
+		 * requested and we don't yet know if the match is a dir,
+		 * we must confirm the file exists and/or determine its type.
+		 *
+		 * If marking dirs, symlink type is inconclusive; we need the
+		 * type for the symlink target, and therefore must try stat
+		 * first unless type is known not to be a symlink. Otherwise,
+		 * 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 (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)))
+				return GLOB_ABORTED;
+			return 0;
+		}
+		if (append(tail, buf, pos, (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)) {
+		char *p;
+		for (p=p2; p>pat && p[-1]=='\\'; p--);
+		if ((p2-p)%2) {
+			p2--;
+			saved_sep = '\\';
+		}
+	}
+	DIR *dir = opendir(pos ? buf : ".");
+	if (!dir) {
+		if (errfunc(buf, errno) || (flags & GLOB_ERR))
+			return GLOB_ABORTED;
+		return 0;
+	}
+	int old_errno = errno;
+	struct dirent *de;
+	while (errno=0, de=readdir(dir)) {
+		/* Quickly skip non-directories when there's pattern left. */
+		if (p2 && de->d_type && de->d_type!=DT_DIR && de->d_type!=DT_LNK)
+			continue;
+
+		size_t l = strlen(de->d_name);
+		if (l >= PATH_MAX-pos) continue;
+
+		if (p2) *p2 = 0;
+
+		int fnm_flags= ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)
+			| ((!(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]=='.'
+		    && (!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);
+		if (r) {
+			closedir(dir);
+			return r;
+		}
+	}
+	int readerr = errno;
+	if (p2) *p2 = saved_sep;
+	closedir(dir);
+	if (readerr && (errfunc(buf, errno) || (flags & GLOB_ERR)))
+		return GLOB_ABORTED;
+	errno = old_errno;
+	return 0;
+}
+
+static int ignore_err(const char *path, int err)
+{
+	return 0;
+}
+
+static void freelist(struct match *head)
+{
+	struct match *match, *next;
+	for (match=head->next; match; match=next) {
+		next = match->next;
+		free(match);
+	}
+}
+
+static int sort(const void *a, const void *b)
+{
+	return strcmp(*(const char **)a, *(const char **)b);
+}
+
+#ifdef __wasilibc_unmodified_upstream // WASI has no usernames
+static int expand_tilde(char **pat, char *buf, size_t *pos)
+{
+	char *p = *pat + 1;
+	size_t i = 0;
+
+	char delim, *name_end = __strchrnul(p, '/');
+	if ((delim = *name_end)) *name_end++ = 0;
+	*pat = name_end;
+
+	char *home = *p ? NULL : getenv("HOME");
+	if (!home) {
+		struct passwd pw, *res;
+		switch (*p ? getpwnam_r(p, &pw, buf, PATH_MAX, &res)
+			   : getpwuid_r(getuid(), &pw, buf, PATH_MAX, &res)) {
+		case ENOMEM:
+			return GLOB_NOSPACE;
+		case 0:
+			if (!res)
+		default:
+				return GLOB_NOMATCH;
+		}
+		home = pw.pw_dir;
+	}
+	while (i < PATH_MAX - 2 && *home)
+		buf[i++] = *home++;
+	if (*home)
+		return GLOB_NOMATCH;
+	if ((buf[i] = delim))
+		buf[++i] = 0;
+	*pos = i;
+	return 0;
+}
+#endif
+
+int glob(const char *restrict pat, int flags, int (*errfunc)(const char *path, int err), glob_t *restrict g)
+{
+	struct match head = { .next = NULL }, *tail = &head;
+	size_t cnt, i;
+	size_t offs = (flags & GLOB_DOOFFS) ? g->gl_offs : 0;
+	int error = 0;
+	char buf[PATH_MAX];
+	
+	if (!errfunc) errfunc = ignore_err;
+
+	if (!(flags & GLOB_APPEND)) {
+		g->gl_offs = offs;
+		g->gl_pathc = 0;
+		g->gl_pathv = NULL;
+	}
+
+	if (*pat) {
+		char *p = strdup(pat);
+		if (!p) return GLOB_NOSPACE;
+		buf[0] = 0;
+		size_t pos = 0;
+		char *s = p;
+#ifdef __wasilibc_unmodified_upstream // WASI has no usernames
+		if ((flags & (GLOB_TILDE | GLOB_TILDE_CHECK)) && *p == '~')
+			error = expand_tilde(&s, buf, &pos);
+#endif
+		if (!error)
+			error = do_glob(buf, pos, 0, s, flags, errfunc, &tail);
+		free(p);
+	}
+
+	if (error == GLOB_NOSPACE) {
+		freelist(&head);
+		return error;
+	}
+	
+	for (cnt=0, tail=head.next; tail; tail=tail->next, cnt++);
+	if (!cnt) {
+		if (flags & GLOB_NOCHECK) {
+			tail = &head;
+			if (append(&tail, pat, strlen(pat), 0))
+				return GLOB_NOSPACE;
+			cnt++;
+		} else
+			return GLOB_NOMATCH;
+	}
+
+	if (flags & GLOB_APPEND) {
+		char **pathv = realloc(g->gl_pathv, (offs + g->gl_pathc + cnt + 1) * sizeof(char *));
+		if (!pathv) {
+			freelist(&head);
+			return GLOB_NOSPACE;
+		}
+		g->gl_pathv = pathv;
+		offs += g->gl_pathc;
+	} else {
+		g->gl_pathv = malloc((offs + cnt + 1) * sizeof(char *));
+		if (!g->gl_pathv) {
+			freelist(&head);
+			return GLOB_NOSPACE;
+		}
+		for (i=0; i<offs; i++)
+			g->gl_pathv[i] = NULL;
+	}
+	for (i=0, tail=head.next; i<cnt; tail=tail->next, i++)
+		g->gl_pathv[offs + i] = tail->name;
+	g->gl_pathv[offs + i] = NULL;
+	g->gl_pathc += cnt;
+
+	if (!(flags & GLOB_NOSORT))
+		qsort(g->gl_pathv+offs, cnt, sizeof(char *), sort);
+	
+	return error;
+}
+
+void globfree(glob_t *g)
+{
+	size_t i;
+	for (i=0; i<g->gl_pathc; i++)
+		free(g->gl_pathv[g->gl_offs + i] - offsetof(struct match, name));
+	free(g->gl_pathv);
+	g->gl_pathc = 0;
+	g->gl_pathv = NULL;
+}
+
+weak_alias(glob, glob64);
+weak_alias(globfree, globfree64);