starting a rough editor program as a scaffold to test and try the visor

algorithms

diff --git a/.gitignore b/.gitignore
index a8f9429..1f97476 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 *.swp
 *.a
 *.so
+visor/visor

diff --git a/visor/Makefile b/visor/Makefile
new file mode 100644 (file)
index 0000000..b97b548
--- /dev/null
+++ b/visor/Makefile
@@ -0,0 +1,23 @@
+src = $(wildcard src/*.c)
+obj = $(src:.c=.o)
+dep = $(obj:.o=.d)
+bin = visor
+
+CFLAGS = -pedantic -Wall -g
+
+$(bin): $(obj)
+       $(CC) -o $@ $(obj) $(LDFLAGS)
+
+-include $(dep)
+
+%.d: %.c
+       @echo dep $@
+       @$(CPP) $(CFLAGS) $< -MM -MT $(@:.d=.o) >$@
+
+.PHONY: clean
+clean:
+       rm -f $(obj) $(bin)
+
+.PHONY: cleandep
+cleandep:
+       rm -f $(dep)

diff --git a/visor/src/main_unix.c b/visor/src/main_unix.c
new file mode 100644 (file)
index 0000000..37406a0
--- /dev/null
+++ b/visor/src/main_unix.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <signal.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+static int init(void);
+static void cleanup(void);
+static void sighandler(int s);
+
+int term_width, term_height;
+int ttyfd;
+struct termios saved_term;
+
+int main(int argc, char **argv)
+{
+       int res;
+       char c;
+
+       if(init() == -1) {
+               return 1;
+       }
+
+       for(;;) {
+               if((res = read(ttyfd, &c, 1)) == 0 || (res < 0 && errno != EINTR)) {
+                       break;
+               }
+               /* proc input */
+       }
+
+       cleanup();
+       return 0;
+}
+
+static int init(void)
+{
+       struct termios term;
+       struct winsize winsz;
+
+       if((ttyfd = open("/dev/tty", O_RDWR)) == -1) {
+               perror("failed to open /dev/tty");
+               return -1;
+       }
+       if(tcgetattr(ttyfd, &term) == -1) {
+               perror("failed to get terminal attr");
+               return -1;
+       }
+       saved_term = term;
+       term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+       term.c_oflag &= ~OPOST;
+       term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+       term.c_cflag = (term.c_cflag & ~(CSIZE | PARENB)) | CS8;
+
+       if(tcsetattr(ttyfd, TCSAFLUSH, &term) == -1) {
+               perror("failed to change terminal attributes");
+               return -1;
+       }
+
+       ioctl(1, TIOCGWINSZ, &winsz);
+       term_width = winsz.ws_col;
+       term_height = winsz.ws_row;
+
+       signal(SIGWINCH, sighandler);
+
+       write(ttyfd, "\033[2J", 4);
+
+       return 0;
+}
+
+static void cleanup(void)
+{
+       tcsetattr(ttyfd, TCSAFLUSH, &saved_term);
+       close(ttyfd);
+}
+
+static void sighandler(int s)
+{
+       struct winsize winsz;
+
+       signal(s, sighandler);
+
+       switch(s) {
+       case SIGWINCH:
+               ioctl(1, TIOCGWINSZ, &winsz);
+               term_width = winsz.ws_col;
+               term_height = winsz.ws_row;
+               /* redraw */
+               break;
+
+       default:
+               break;
+       }
+}