escape

msh.c

@@ -12,6 +12,8 @@
 #include "fstr.h"
 #include "err.h"
 
+#define S_ESCAPE 0x1
+
 fstr_t PS1 = {0};
 unsigned int histsize = DEF_HISTSIZE;
 
@@ -44,6 +46,7 @@ int main(int argc, char **argv)
 	(void)argc;
 	(void)argv;
 	char i;
+	unsigned int state = 0;
 	
 	sh_setup_terminal();
 	for (;;) {
@@ -52,12 +55,23 @@ int main(int argc, char **argv)
 		sh_update_ps1();
 		sh_print_ps1();
 		fflush(stdout);
-		while (1) {
+		for (int line = 1; line;) {
+			
 			read(STDIN_FILENO, &i, 1); // This blocks
 			fputc(i, stdout);
 			fflush(stdout);
-			if (i == '\n')
+
+			switch (i) {
+			case '\n':
+				line = state & S_ESCAPE;
+				break;
+			case '\\':
+				state ^= ~S_ESCAPE;
+				break;
+			default:
+				state &= ~S_ESCAPE;
 				break;
+			}
 		}
 	}