outline

1 files changed, 112 insertions, 0 deletions

diff --git a/who.c b/who.c
new file mode 100644
index 0000000..fc913f2
--- /dev/null
+++ b/who.c
@@ -0,0 +1,112 @@
+#define _XOPEN_SOURCE
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+enum {
+	BOOT	= 1<<0,
+	DEAD	= 1<<1,
+	HEADER	= 1<<2,
+	LOGIN	= 1<<3,
+	SELF	= 1<<4,
+	INIT	= 1<<5,
+	QUICK	= 1<<6,
+	RUNLEVEL= 1<<7,
+	TIME	= 1<<8,
+	TERMINAL= 1<<9,
+	IDLE	= 1<<10,
+};
+
+int main(int argc, char *argv[])
+{
+	int flags = 0;
+
+	setlocale(LC_ALL, "");
+
+	int c;
+	while ((c = getopt(argc, argv, "abdHlmpqrstTu")) != -1) {
+		switch (c) {
+		case 'a':
+			/* -bdlprtTu */
+			flags |= BOOT;
+			flags |= DEAD;
+			flags |= LOGIN;
+			flags |= INIT;
+			flags |= RUNLEVEL;
+			flags |= TIME;
+			flags |= TERMINAL;
+			flags |= IDLE;
+			break;
+
+		case 'b':
+			flags |= BOOT;
+			break;
+
+		case 'd':
+			flags |= DEAD;
+			break;
+
+		case 'H':
+			flags |= HEADER;
+			break;
+
+		case 'l':
+			flags |= LOGIN;
+			break;
+
+		case 'm':
+			flags |= SELF;
+			break;
+
+		case 'p':
+			flags |= INIT;
+			break;
+
+		case 'q':
+			flags |= QUICK;
+			break;
+
+		case 'r':
+			flags |= RUNLEVEL;
+			break;
+
+		case 's':
+			/* default */
+			break;
+
+		case 't':
+			flags |= TIME;
+			break;
+
+		case 'T':
+			flags |= TERMINAL;
+			break;
+
+		case 'u':
+			flags |= IDLE;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (flags & QUICK) {
+		flags = QUICK;
+	}
+
+	if (flags == 0 && argc == optind + 2) {
+		if (strcmp("am", argv[optind]))
+			return 1;
+
+		if (strcmp("I", argv[optind+1]) && strcmp("i", argv[optind+1])) {
+			return 1;
+		}
+
+		printf("ok\n");
+		flags = SELF;
+	}
+
+	return 0;
+}