sed: fix a command with multible trailing backslashes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/editors/sed.c b/editors/sed.c
index 30ab8c9fb..4bd6e0168 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -487,7 +487,7 @@ static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
 static void add_cmd(const char *cmdstr)
 {
 	sed_cmd_t *sed_cmd;
-	int temp;
+	unsigned len, n;
 
 	/* Append this line to any unfinished line from last time. */
 	if (G.add_cmd_line) {
@@ -496,12 +496,14 @@ static void add_cmd(const char *cmdstr)
 		cmdstr = G.add_cmd_line = tp;
 	}
 
-	/* If this line ends with backslash, request next line. */
-	temp = strlen(cmdstr);
-	if (temp && cmdstr[--temp] == '\\') {
+	/* If this line ends with unescaped backslash, request next line. */
+	n = len = strlen(cmdstr);
+	while (n && cmdstr[n-1] == '\\')
+		n--;
+	if ((len - n) & 1) { /* if odd number of trailing backslashes */
 		if (!G.add_cmd_line)
 			G.add_cmd_line = xstrdup(cmdstr);
-		G.add_cmd_line[temp] = '\0';
+		G.add_cmd_line[len-1] = '\0';
 		return;
 	}
 
@@ -560,7 +562,7 @@ static void add_cmd(const char *cmdstr)
 		/* last part (mandatory) will be a command */
 		if (!*cmdstr)
 			bb_error_msg_and_die("missing command");
-		sed_cmd->cmd = *(cmdstr++);
+		sed_cmd->cmd = *cmdstr++;
 		cmdstr = parse_cmd_args(sed_cmd, cmdstr);
 
 		/* Add the command to the command array */