config

commit 7bdd1bc9e4c8e1fe62754c961b6d9a360a937830
parent 0f047b44b0972948e5111e239de384ee997fc729
Author: Jacob R. Edwards <jacob@jacobedwards.org>
Date:   Sun,  8 Oct 2023 08:50:15 -0700

Add rfind program

This program reverse walks the current path looking for the first
name matching the given argument. For instance 'rfind .git' will
determine whether you're in a git repository.

Diffstat:
M
local/src/src/singles/Makefile
 | 
3
++-
A
local/src/src/singles/rfind.c
 | 
46
++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/local/src/src/singles/Makefile b/local/src/src/singles/Makefile
@@ -1,7 +1,8 @@
 names =\
 	datediff\
-	timedec\
 	numsep\
+	rfind\
+	timedec\
 	urldecode\
 	urlencode\
 
diff --git a/local/src/src/singles/rfind.c b/local/src/src/singles/rfind.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Jacob R. Edwards
+ * This program walks the directory hierarchy backwards looking for
+ * the given name.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void
+die(char *msg)
+{
+	perror(msg);
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *name;
+	char path[PATH_MAX];
+	int last;
+
+	if (argc != 2) {
+		fprintf(stderr, "usage: rfind name\n");
+		exit(1);
+	}
+	name = argv[1];
+
+	last = 0;
+	for (last = 0; getwd(path);) {
+		last = !path[1];
+		if (access(name, F_OK) == 0) {
+			if (last)
+				exit(printf("/%s\n", name) < 0);
+			else
+				exit(printf("%s/%s\n", path, name) < 0);
+		}
+		if (chdir(".."))
+			die("chdir ..");
+	}
+
+	return 1;
+}