Squash commits for public release

libs/libc/stdlib/pts.c

@@ -0,0 +1,50 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#define _PATH_PTS "/dev/pts"
+#define MASTER_PTY(dev) (major(dev) == 128)
+#define SLAVE_PTY(dev) (major(dev) == 136)
+
+int posix_openpt(int flags)
+{
+    return open("/dev/ptmx", flags);
+}
+
+int ptsname_r(int fd, char* buf, size_t buflen)
+{
+    int len = strlen(_PATH_PTS);
+    if (buflen < len + 2) {
+        set_errno(ERANGE);
+        return -ERANGE;
+    }
+
+    stat_t stat;
+    if (fstat(fd, &stat) < 0) {
+        return errno;
+    }
+
+    if (!MASTER_PTY(stat.st_dev)) {
+        set_errno(ENOTTY);
+        return -ENOTTY;
+    }
+
+    int ptyno = minor(stat.st_dev);
+
+    char* p = strcpy(buf, _PATH_PTS);
+    p[len + 0] = '0' + ptyno;
+    p[len + 1] = '\0';
+
+    return 0;
+}
+
+static char ptsbuf[32];
+char* ptsname(int fd)
+{
+    if (ptsname_r(fd, ptsbuf, sizeof(ptsbuf)) < 0) {
+        return NULL;
+    }
+    return ptsbuf;
+}