libbb: add forgotten part of "script" applet change

diff --git a/libbb/getpty.c b/libbb/getpty.c
new file mode 100644 (file)
index 0000000..4b65188
--- /dev/null
+++ b/libbb/getpty.c
@@ -0,0 +1,56 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini getpty implementation for busybox
+ * Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+int getpty(char *line, int size)
+{
+       int p;
+#if ENABLE_FEATURE_DEVPTS
+       p = open("/dev/ptmx", O_RDWR);
+       if (p > 0) {
+               const char *name;
+               grantpt(p);
+               unlockpt(p);
+               name = ptsname(p);
+               if (!name) {
+                       bb_perror_msg("ptsname error (is /dev/pts mounted?)");
+                       return -1;
+               }
+               safe_strncpy(line, name, size);
+               return p;
+       }
+#else
+       struct stat stb;
+       int i;
+       int j;
+
+       strcpy(line, "/dev/ptyXX");
+
+       for (i = 0; i < 16; i++) {
+               line[8] = "pqrstuvwxyzabcde"[i];
+               line[9] = '0';
+               if (stat(line, &stb) < 0) {
+                       continue;
+               }
+               for (j = 0; j < 16; j++) {
+                       line[9] = j < 10 ? j + '0' : j - 10 + 'a';
+                       if (DEBUG)
+                               fprintf(stderr, "Trying to open device: %s\n", line);
+                       p = open(line, O_RDWR | O_NOCTTY);
+                       if (p >= 0) {
+                               line[5] = 't';
+                               return p;
+                       }
+               }
+       }
+#endif /* FEATURE_DEVPTS */
+       return -1;
+}
+
+