rwc: internally use and print absolute paths HEAD v0.3 master

Else it's not possible to deal with calls like "rwc ./x" in a proper way.

3 files changed, 40 insertions, 6 deletions

diff --git a/README b/README
index 345cb99..690c33c 100644
--- a/README
+++ b/README
@@ -8,8 +8,9 @@ SYNOPSIS
 
 DESCRIPTION
      rwc takes a list of files or directories, watches them using inotify(7),
-     and prints each file name when it changed.  If path is a single dash
-     (‘-’) or absent, rwc reads file names from the standard input.
+     and prints each file name as absolute path when it changed.  If path is a
+     single dash (‘-’) or absent, rwc reads file names from the standard
+     input.
 
      Watching a directory will result in watching all changes to files which
      resides directly in that directory.
@@ -72,4 +73,4 @@ LICENSE
 
      http://creativecommons.org/publicdomain/zero/1.0/
 
-Void Linux                       March 3, 2019                      Void Linux
+Void Linux                      January 3, 2021                     Void Linux
diff --git a/rwc.1 b/rwc.1
index 6a84dee..2bce619 100644
--- a/rwc.1
+++ b/rwc.1
@@ -1,4 +1,4 @@
-.Dd March 3, 2019
+.Dd January 3, 2021
 .Dt RWC 1
 .Os
 .Sh NAME
@@ -12,7 +12,7 @@
 .Nm
 takes a list of files or directories, watches them using
 .Xr inotify 7 ,
-and prints each file name when it changed.
+and prints each file name as absolute path when it changed.
 If
 .Ar path
 is a single dash
diff --git a/rwc.c b/rwc.c
index 43ea95a..a316999 100644
--- a/rwc.c
+++ b/rwc.c
@@ -63,12 +63,45 @@ wdorder(const void *a, const void *b)
 		return 1;
 }
 
+static char *
+realpath_nx(char *path)
+{
+	char *r = realpath(path, 0);
+
+	if (!r && errno == ENOENT) {
+		// resolve dirname and append basename
+
+		char *path2 = strdup(path);
+		if (!path2)
+			return 0;
+		char *d = realpath(dirname(path2), 0);
+		free(path2);
+		if (!d)
+			return 0;
+		char *b = basename(path);
+		size_t l = strlen(d) + 1 + strlen(b) + 1;
+		r = malloc(l);
+		if (!r)
+			return 0;
+		snprintf(r, l, "%s/%s", d, b);
+	}
+
+	return r;
+}
+
 static void
-add(char *file)
+add(char *path)
 {
 	struct stat st;
 	int wd;
 
+	char *file = realpath_nx(path);
+	if (!file) {
+		fprintf(stderr, "%s: realpath: %s: %s\n",
+		    argv0, path, strerror(errno));
+		return;
+	}
+
 	char *dir = file;
 
 	tsearch(strdup(file), &root, order);