From 4f7d9bf759bc38fc363155643e9b7bb8fcdf0724 Mon Sep 17 00:00:00 2001
From: Toni Uhlig <matzeton@googlemail.com>
Date: Wed, 13 Jun 2018 12:37:59 +0200
Subject: POTD skeleton #104.

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
---
 src/options.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

(limited to 'src/options.c')

diff --git a/src/options.c b/src/options.c
index 0f23f4d..a9b96f7 100644
--- a/src/options.c
+++ b/src/options.c
@@ -10,6 +10,9 @@
 #include <string.h>
 #include <assert.h>
 #include <getopt.h>
+#include <linux/limits.h>
+#include <libgen.h>
+#include <errno.h>
 
 #include "options.h"
 
@@ -99,6 +102,37 @@ static size_t snprint_multilined_ljust(const char *prefix,
 static void usage(const char *arg0, int print_copyright);
 
 
+static int parse_path(opt_ptr *d, char *some_path)
+{
+    int rc = 1;
+    char path[PATH_MAX];
+    char *dir, *base;
+
+    d->str_dup = realpath(some_path, NULL);
+    if (!d->str_dup && errno == ENOENT) {
+        snprintf(path, sizeof path, "%s", some_path);
+        dir = dirname(path);
+        if (!dir)
+            return 1;
+        dir = realpath(dir, NULL);
+        if (!dir)
+            return 1;
+        snprintf(path, sizeof path, "%s", some_path);
+        base = basename(path);
+        if (!base)
+            goto error;
+        snprintf(path, sizeof path, "%s/%s", dir, base);
+        d->str_dup = strndup(path, strnlen(path, sizeof path));
+error:
+        free(dir);
+    }
+
+    if (d->str_dup)
+        rc = 0;
+
+    return rc;
+}
+
 static int opt_convert(opt_type t, opt_ptr *d)
 {
     char *endptr = NULL;
@@ -114,7 +148,8 @@ static int opt_convert(opt_type t, opt_ptr *d)
             d->str_dup = strdup(optarg);
             break;
         case OT_PATH:
-            d->str_dup = realpath(optarg, NULL);
+            if (parse_path(d, optarg))
+                return 1;
             break;
         case OT_NOARG:
         case OT_INVALID:
-- 
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