X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmisc%2Fwordexp.c;h=a5f1b658ce0600c6d4e48d53a692a64faafaa79e;hb=0a24be213addfb32a8fdfc880fc2649f27d0b9ce;hp=01217ab06328cd128dbd181d554532e423cffca1;hpb=90f09a0dde3b37ebfabc4d3f6e2bb64086b7e804;p=musl

diff --git a/src/misc/wordexp.c b/src/misc/wordexp.c
index 01217ab0..a5f1b658 100644
--- a/src/misc/wordexp.c
+++ b/src/misc/wordexp.c
@@ -5,6 +5,23 @@
 #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)
 {
@@ -12,17 +29,20 @@ static char *getword(FILE *f)
 	return getdelim(&s, (size_t [1]){0}, 0, f) < 0 ? 0 : s;
 }
 
-int wordexp(const char *s, wordexp_t *we, int flags)
+static int do_wordexp(const char *s, wordexp_t *we, int flags)
 {
-	size_t i, l, len;
+	size_t i, l;
 	int sq=0, dq=0;
 	size_t np=0;
-	char *cmd, *w, **tmp;
+	char *w, **tmp;
 	char *redir = (flags & WRDE_SHOWERR) ? "" : "2>/dev/null";
-	int err = 0, status;
+	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);
 
@@ -75,20 +95,48 @@ int wordexp(const char *s, wordexp_t *we, int flags)
 	i = wc;
 	if (flags & WRDE_DOOFFS) {
 		if (we->we_offs > SIZE_MAX/sizeof(void *)/4)
-			return WRDE_NOSPACE;
+			goto nospace;
 		i += we->we_offs;
+	} else {
+		we->we_offs = 0;
 	}
 
-	len = 50 + strlen(s);
-	cmd = malloc(len);
-	if (!cmd) return WRDE_NOSPACE;
-	snprintf(cmd, len, "printf %%s\\\\0 %s %s", s, redir);
-	f = popen(cmd, "r");
-	free(cmd);
-	if (!f) return WRDE_NOSPACE;
+	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;
@@ -101,19 +149,36 @@ int wordexp(const char *s, wordexp_t *we, int flags)
 	}
 	if (!feof(f)) err = WRDE_NOSPACE;
 
-	status = pclose(f);
-	if (WEXITSTATUS(status)) {
-		if (!(flags & WRDE_APPEND)) {
-			free(wv);
-			return WRDE_SYNTAX;
-		} else if (wv==we->we_wordv) {
-			return WRDE_SYNTAX;
-		}
-	}
+	fclose(f);
+	reap(pid);
+
+	if (!wv) wv = calloc(i+1, sizeof *wv);
 
 	we->we_wordv = wv;
-	we->we_wordc = i - we->we_offs;
+	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)