From 32e8c2a3e974ac290c3a6ab75e1346fde3a48da1 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Fri, 15 Mar 2019 12:16:37 -0400
Subject: common function pidfrom() for job control functions

---
 jobcontrol.h |  3 +++
 jobs.c       | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 jobcontrol.h

diff --git a/jobcontrol.h b/jobcontrol.h
new file mode 100644
index 0000000..b80f792
--- /dev/null
+++ b/jobcontrol.h
@@ -0,0 +1,3 @@
+#include <sys/types.h>
+
+pid_t pidfrom(const char *s);
diff --git a/jobs.c b/jobs.c
index 5fe1c6e..9cf7854 100644
--- a/jobs.c
+++ b/jobs.c
@@ -1,5 +1,28 @@
 #define _XOPEN_SOURCE 700
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "jobcontrol.h"
+
+pid_t pidfrom(const char *s)
+{
+	if (*s == '%') {
+		if (!strcmp(s, "%%") || !strcmp(s, "%+")) {
+			/* return current_job; */
+		} else if (!strcmp(s, "%-")) {
+			/* return previous_job; */
+		}
+
+		/* %digits => job # */
+		/* %string => command begins with string */
+		/* %?string => command contains string */
+
+		return -1;
+	}
+
+	return atoi(s);
+}
 
 int jobs_main(int argc, char *argv[])
 {
-- 
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