From bcfcbaf529eb723d9466612985a448dffc3dbe81 Mon Sep 17 00:00:00 2001
From: Emile Clark-Boman <eclarkboman@gmail.com>
Date: Wed, 24 Sep 2025 15:46:56 +1000
Subject: [PATCH] add struct ct_term terminfo/termios/ioctl wrapper

---
 src/term.c | 34 ++++++++++++++++++++++++++++++++++
 src/term.h | 19 +++++++++++++++++++
 src/test.c | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 src/term.c
 create mode 100644 src/term.h
 create mode 100644 src/test.c

diff --git a/src/term.c b/src/term.c
new file mode 100644
index 0000000..6b184a2
--- /dev/null
+++ b/src/term.c
@@ -0,0 +1,34 @@
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "term.h"
+
+int getterm(struct ct_term *const term) {
+  if ((term->fd = open("/dev/tty", O_RDONLY)) == -1)
+    return 1;
+  if (tcgetattr(term->fd, &term->termios0) == -1)
+    return 1;
+  term->termios = term->termios0;
+  return 0;
+}
+
+void endterm(struct ct_term *const term) {
+  if (term->fd != -1) {
+    close(term->fd);
+    /* WARNING: should tcsetattr instead be called on term->fd before closing? */
+    tcsetattr(STDIN_FILENO, TCSANOW, &term->termios0);
+  }
+  free(term);
+}
+
+int termsize(struct ct_term *const term) {
+  struct winsize argp;
+  if (ioctl(term->fd, TIOCGWINSZ, &argp) == -1)
+    return 1;
+
+  term->rows = argp.ws_row;
+  term->cols = argp.ws_col;
+  return 0;
+}
diff --git a/src/term.h b/src/term.h
new file mode 100644
index 0000000..ba6c417
--- /dev/null
+++ b/src/term.h
@@ -0,0 +1,19 @@
+#ifndef _CURSETREE_TERM_H
+#define _CURSETREE_TERM_H
+
+#include "termios.h"
+
+struct ct_term {
+  int fd;
+  unsigned short cols;
+  unsigned short rows;
+
+  struct termios termios0;
+  struct termios termios;
+};
+
+int getterm(struct ct_term *const term);
+void endterm(struct ct_term *const term);
+int termsize(struct ct_term *const term);
+
+#endif /* _CURSETREE_TERM_H */
diff --git a/src/test.c b/src/test.c
new file mode 100644
index 0000000..a35b786
--- /dev/null
+++ b/src/test.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "term.h"
+
+int main(void) {
+  struct ct_term *const term = (struct ct_term *)malloc(sizeof(struct ct_term));
+  if (getterm(term)) {
+    perror("getterm");
+    endterm(term);
+    exit(1);
+  }
+
+  if (termsize(term)) {
+    perror("termsize");
+    endterm(term);
+    exit(1);
+  }
+
+
+  printf("\e[2J\e[1;1H");
+  
+  char *line = (char *)malloc(sizeof(char) * (term->cols + 1));
+  memset(line, 'X', term->cols);
+  line[term->cols] = '\0';
+
+  for (int i=0; i < term->rows; i++) {
+    printf("%s", line);
+  }
+  sleep(3);
+
+  endterm(term);
+  return 0;
+}