From 18710989429b077577954671f1f71fbd8298a3e2 Mon Sep 17 00:00:00 2001
From: BodgeMaster <>
Date: Thu, 6 Feb 2025 11:28:49 +0100
Subject: [PATCH] print strerror descriptions in error messages instead of
 errno

---
 ethercat.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/ethercat.c b/ethercat.c
index e2e4193..0c38366 100644
--- a/ethercat.c
+++ b/ethercat.c
@@ -51,23 +51,23 @@ int main(int argc, char** argv) {
   }
 
   if (freopen(NULL, "rb", stdin) == NULL) {
-    fprintf(stderr, "Failed to set stdin to binary mode: %i\n", errno);
+    fprintf(stderr, "Failed to set stdin to binary mode: %s\n", strerror(errno));
     return EXIT_RUNTIME;
   }
 
   stdin_dup = dup(fileno(stdin));
   if (stdin_dup == -1) {
-    fprintf(stderr, "Failed to dup() stdin: %i\n", errno);
+    fprintf(stderr, "Failed to dup() stdin: %s\n", strerror(errno));
   }
 
   if (freopen(NULL, "wb", stdout) == NULL) {
-    fprintf(stderr, "Failed to set stdout to binary mode: %i\n", errno);
+    fprintf(stderr, "Failed to set stdout to binary mode: %s\n", strerror(errno));
     return EXIT_RUNTIME;
   }
 
   file_descriptor = open(DEVICE_NODE_TUN, O_RDWR | O_NONBLOCK);
   if (file_descriptor == -1) {
-    fprintf(stderr, "Failed to open %s: %i\n", DEVICE_NODE_TUN, errno);
+    fprintf(stderr, "Failed to open %s: %s\n", DEVICE_NODE_TUN, strerror(errno));
     return EXIT_RUNTIME;
   }
 
@@ -76,7 +76,7 @@ int main(int argc, char** argv) {
   strncpy(ifr.ifr_name, argv[1], IFNAMSIZ);
 
   if (ioctl(file_descriptor, TUNSETIFF, &ifr) == -1) {
-    fprintf(stderr, "An error occurred while trying to ioctl: %i\n", errno);
+    fprintf(stderr, "An error occurred while trying to ioctl: %s\n", strerror(errno));
     close(file_descriptor);
     return EXIT_RUNTIME;
   }
@@ -90,7 +90,7 @@ int main(int argc, char** argv) {
   while (fcntl(file_descriptor, F_GETFD) != -1 && !stop_now) {
     read_size = read(file_descriptor, buffer, BUFFER_SIZE);
     if (read_size == -1) {
-      fprintf(stderr, "Failed to read from tap: %i\n", errno);
+      fprintf(stderr, "Failed to read from tap: %s\n", strerror(errno));
       yeet(file_descriptor);
       return EXIT_RUNTIME;
     }
@@ -102,7 +102,7 @@ int main(int argc, char** argv) {
       // using read_size as the amount of remaining bytes
       write_size = write(fileno(stdout), buffer, read_size);
       if (write_size == -1) {
-        fprintf(stderr, "Failed to write stdout: %i\n", errno);
+        fprintf(stderr, "Failed to write stdout: %s\n", strerror(errno));
         yeet(file_descriptor);
         return EXIT_RUNTIME;
       }
@@ -110,7 +110,7 @@ int main(int argc, char** argv) {
     just_created_dup = false;
     read_size = read(stdin_dup, buffer, BUFFER_SIZE);
     if (read_size == -1) {
-      fprintf(stderr, "Failed to read from stdin: %i\n", errno);
+      fprintf(stderr, "Failed to read from stdin: %s\n", strerror(errno));
       yeet(file_descriptor);
       return EXIT_RUNTIME;
     }
@@ -125,7 +125,7 @@ int main(int argc, char** argv) {
     ) {
       write_size = write(file_descriptor, buffer, read_size);
       if (write_size == -1) {
-        fprintf(stderr, "Failed to write stdout: %i\n", errno);
+        fprintf(stderr, "Failed to write stdout: %s\n", strerror(errno));
         yeet(file_descriptor);
         return EXIT_RUNTIME;
       }