libbb: add forgotten part of "script" applet change

1 files changed, 56 insertions, 0 deletions

diff --git a/libbb/getpty.c b/libbb/getpty.c
new file mode 100644
index 000000000..4b65188fb
--- /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;
+}
+
+