From b793919567fb834a38b5672b7c5554464b4b3605 Mon Sep 17 00:00:00 2001
From: firewave <firewave@users.noreply.github.com>
Date: Wed, 11 Jun 2025 12:40:46 +0200
Subject: [PATCH 1/2] main.cpp: replaced `std::exit()` with `return`

---
 main.cpp | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/main.cpp b/main.cpp
index f05cf793..1f6b0419 100644
--- a/main.cpp
+++ b/main.cpp
@@ -77,18 +77,18 @@ int main(int argc, char **argv)
             }
         } else if (filename) {
             std::cout << "error: multiple filenames specified" << std::endl;
-            std::exit(1);
+            return 1;
         } else {
             filename = arg;
         }
     }
 
     if (error)
-        std::exit(1);
+        return 1;
 
     if (quiet && error_only) {
         std::cout << "error: -e cannot be used in conjunction with -q" << std::endl;
-        std::exit(1);
+        return 1;
     }
 
     if (!filename) {
@@ -102,7 +102,7 @@ int main(int argc, char **argv)
         std::cout << "  -q              Quiet mode (no output)." << std::endl;
         std::cout << "  -is             Use std::istream interface." << std::endl;
         std::cout << "  -e              Output errors only." << std::endl;
-        std::exit(0);
+        return 0;
     }
 
     dui.removeComments = true;
@@ -115,7 +115,7 @@ int main(int argc, char **argv)
         std::ifstream f(filename);
         if (!f.is_open()) {
             std::cout << "error: could not open file '" << filename << "'" << std::endl;
-            std::exit(1);
+            return 1;
         }
         rawtokens = new simplecpp::TokenList(f, files,filename,&outputList);
     } else {

From 16665fda3e98681e9786c76e4dd2e62bb159fd0f Mon Sep 17 00:00:00 2001
From: firewave <firewave@users.noreply.github.com>
Date: Wed, 11 Jun 2025 12:42:01 +0200
Subject: [PATCH 2/2] main.cpp: error out when file/path provided by `-I` or
 `-include=` do not exist

---
 main.cpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/main.cpp b/main.cpp
index 1f6b0419..3e664272 100644
--- a/main.cpp
+++ b/main.cpp
@@ -91,6 +91,33 @@ int main(int argc, char **argv)
         return 1;
     }
 
+    // TODO: move this logic into simplecpp?
+    {
+        bool inc_missing = false;
+        for (const std::string& inc : dui.includes) {
+            std::ifstream f(inc);
+            if (!f.is_open()) {
+                inc_missing = true;
+                std::cout << "error: could not open include '" << inc << "'" << std::endl;
+            }
+        }
+        if (inc_missing)
+            return 1;
+    }
+    {
+            bool inc_missing = false;
+            for (const std::string& inc : dui.includePaths) {
+                // TODO: check if this is a directory
+                std::ifstream f(inc);
+                if (!f.is_open()) {
+                    inc_missing = true;
+                    std::cout << "error: could not find include path '" << inc << "'" << std::endl;
+                }
+            }
+            if (inc_missing)
+                return 1;
+        }
+
     if (!filename) {
         std::cout << "Syntax:" << std::endl;
         std::cout << "simplecpp [options] filename" << std::endl;