Helps to "hg add" echo.c. Also, implement \0123 escapes for -e.

1 files changed, 50 insertions, 0 deletions

diff --git a/toys/echo.c b/toys/echo.c
new file mode 100644
index 00000000..93a3dbc0
--- /dev/null
+++ b/toys/echo.c
@@ -0,0 +1,50 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * echo.c - echo supporting -n and -e.
+ */
+
+#include "toys.h"
+
+int echo_main(void)
+{
+	int i = 0;
+	char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v";
+	
+	for (;;) {
+		arg = toys.optargs[i];
+		if (!arg) break;
+		if (i++) xputc(' ');
+		
+		if (toys.optflags&2) {
+			int c, j = 0;
+			for (;;) {
+				c = arg[j++];
+				if (!c) break;
+				if (c == '\\') {
+					char *found;
+					int d = arg[j++];
+
+
+					if (d) {
+						found = strchr(from, d);
+						if (found) c = to[found-from];
+						else if (d == 'c') goto done;
+						else if (d == '0') {
+							c = 0;
+							while (arg[j]>='0' && arg[j]<='7')
+								c = (c*8)+arg[j++]-'0';
+						}
+						// \0123
+					}
+				}
+				xputc(c);
+			}
+			// \\ thingy
+		} else xprintf("%s", arg);
+	}
+	// Output "\n" if no -n
+	if (!(toys.optflags&1)) xputc('\n');
+done:
+	xflush();
+	return 0;
+}