Add a "fork" of musl as //fusl.

fusl/src/misc/wordexp.c

Index: fusl/src/misc/wordexp.c
diff --git a/fusl/src/misc/wordexp.c b/fusl/src/misc/wordexp.c
new file mode 100644
index 0000000000000000000000000000000000000000..db39b5b8a3e3dee78bf6a54c1af3a1e23013c72b
--- /dev/null
+++ b/fusl/src/misc/wordexp.c
@@ -0,0 +1,193 @@
+#include <wordexp.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+#include "pthread_impl.h"
+
+static void reap(pid_t pid)
+{
+	int status;
+	for (;;) {
+		if (waitpid(pid, &status, 0) < 0) {
+			if (errno != EINTR) return;
+		} else {
+			if (WIFEXITED(status)) return;
+		}
+	}
+}
+
+static char *getword(FILE *f)
+{
+	char *s = 0;
+	return getdelim(&s, (size_t [1]){0}, 0, f) < 0 ? 0 : s;
+}
+
+static int do_wordexp(const char *s, wordexp_t *we, int flags)
+{
+	size_t i, l;
+	int sq=0, dq=0;
+	size_t np=0;
+	char *w, **tmp;
+	char *redir = (flags & WRDE_SHOWERR) ? "" : "2>/dev/null";
+	int err = 0;
+	FILE *f;
+	size_t wc = 0;
+	char **wv = 0;
+	int p[2];
+	pid_t pid;
+	sigset_t set;
+
+	if (flags & WRDE_REUSE) wordfree(we);
+
+	if (flags & WRDE_NOCMD) for (i=0; s[i]; i++) switch (s[i]) {
+	case '\\':
+		if (!sq) i++;
+		break;
+	case '\'':
+		if (!dq) sq^=1;
+		break;
+	case '"':
+		if (!sq) dq^=1;
+		break;
+	case '(':
+		if (np) {
+			np++;
+			break;
+		}
+	case ')':
+		if (np) {
+			np--;
+			break;
+		}
+	case '\n':
+	case '|':
+	case '&':
+	case ';':
+	case '<':
+	case '>':
+	case '{':
+	case '}':
+		if (!(sq|dq|np)) return WRDE_BADCHAR;
+		break;
+	case '$':
+		if (sq) break;
+		if (s[i+1]=='(' && s[i+2]=='(') {
+			i += 2;
+			np += 2;
+			break;
+		} else if (s[i+1] != '(') break;
+	case '`':
+		if (sq) break;
+		return WRDE_CMDSUB;
+	}
+
+	if (flags & WRDE_APPEND) {
+		wc = we->we_wordc;
+		wv = we->we_wordv;
+	}
+
+	i = wc;
+	if (flags & WRDE_DOOFFS) {
+		if (we->we_offs > SIZE_MAX/sizeof(void *)/4)
+			goto nospace;
+		i += we->we_offs;
+	} else {
+		we->we_offs = 0;
+	}
+
+	if (pipe2(p, O_CLOEXEC) < 0) goto nospace;
+	__block_all_sigs(&set);
+	pid = fork();
+	__restore_sigs(&set);
+	if (pid < 0) {
+		close(p[0]);
+		close(p[1]);
+		goto nospace;
+	}
+	if (!pid) {
+		if (p[1] == 1) fcntl(1, F_SETFD, 0);
+		else dup2(p[1], 1);
+		execl("/bin/sh", "sh", "-c",
+			"eval \"printf %s\\\\\\\\0 x $1 $2\"",
+			"sh", s, redir, (char *)0);
+		_exit(1);
+	}
+	close(p[1]);
+	
+	f = fdopen(p[0], "r");
+	if (!f) {
+		close(p[0]);
+		kill(pid, SIGKILL);
+		reap(pid);
+		goto nospace;
+	}
+
+	l = wv ? i+1 : 0;
+
+	free(getword(f));
+	if (feof(f)) {
+		fclose(f);
+		reap(pid);
+		return WRDE_SYNTAX;
+	}
+
+	while ((w = getword(f))) {
+		if (i+1 >= l) {
+			l += l/2+10;
+			tmp = realloc(wv, l*sizeof(char *));
+			if (!tmp) break;
+			wv = tmp;
+		}
+		wv[i++] = w;
+		wv[i] = 0;
+	}
+	if (!feof(f)) err = WRDE_NOSPACE;
+
+	fclose(f);
+	reap(pid);
+
+	if (!wv) wv = calloc(i+1, sizeof *wv);
+
+	we->we_wordv = wv;
+	we->we_wordc = i;
+
+	if (flags & WRDE_DOOFFS) {
+		if (wv) for (i=we->we_offs; i; i--)
+			we->we_wordv[i-1] = 0;
+		we->we_wordc -= we->we_offs;
+	}
+	return err;
+
+nospace:
+	if (!(flags & WRDE_APPEND)) {
+		we->we_wordc = 0;
+		we->we_wordv = 0;
+	}
+	return WRDE_NOSPACE;
+}
+
+int wordexp(const char *restrict s, wordexp_t *restrict we, int flags)
+{
+	int r, cs;
+	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+	r = do_wordexp(s, we, flags);
+	pthread_setcancelstate(cs, 0);
+	return r;
+}
+
+void wordfree(wordexp_t *we)
+{
+	size_t i;
+	if (!we->we_wordv) return;
+	for (i=0; i<we->we_wordc; i++) free(we->we_wordv[we->we_offs+i]);
+	free(we->we_wordv);
+	we->we_wordv = 0;
+	we->we_wordc = 0;
+}