1 files changed, 38 insertions, 2 deletions

diff --git a/std.c b/std.c
index 2ce1722..ef9e57a 100644
--- a/std.c
+++ b/std.c
@@ -3,6 +3,10 @@
 #include <sys/wait.h>
 #include <ctype.h>
 #include <err.h>
+#include <fcntl.h>
+#if !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
+#include <pty.h>
+#endif
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -17,7 +21,7 @@
 static void buffer(char c);
 static void cmd(const char *cmdstr, ...);
 static int getch();
-void getpty(void);
+static void getpty(void);
 static void movea(int x, int y);
 static void mover(int x, int y);
 static void parseesc(void);
@@ -41,7 +45,7 @@ typedef struct {
 static int cols = 80, lines = 25;
 static int cx = 0, cy = 0;
 static int c;
-int ptm, pts;
+static int ptm, pts;
 static _Bool bold, digit, qmark;
 static pid_t pid;
 static RingBuffer buf;
@@ -208,6 +212,38 @@ scroll(int l) {
 }
 
 void
+getpty(void) {
+        char *ptsdev;
+
+#if defined(_GNU_SOURCE)
+        ptm = getpt();
+#elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
+        ptm = posix_openpt(O_RDWR);
+#else
+        ptm = open("/dev/ptmx", O_RDWR);
+        if(ptm == -1)
+                if(openpty(&ptm, &pts, NULL, NULL, NULL) == -1)
+                        err(EXIT_FAILURE, "cannot open pty");
+#endif
+#if defined(_XOPEN_SOURCE)
+        if(ptm != -1) {
+                if(grantpt(ptm) == -1)
+                        err(EXIT_FAILURE, "cannot grant access to pty");
+                if(unlockpt(ptm) == -1)
+                        err(EXIT_FAILURE, "cannot unlock pty");
+                ptsdev = ptsname(ptm);
+                if(!ptsdev)
+                        err(EXIT_FAILURE, "slave pty name undefined");
+                pts = open(ptsdev, O_RDWR);
+                if(pts == -1)
+                        err(EXIT_FAILURE, "cannot open slave pty");
+        }
+        else
+                err(EXIT_FAILURE, "cannot open pty");
+#endif
+}
+
+void
 shell(void) {
         static char *shell = NULL;