From 137e46a274f693d041ed4cd83acb055014599a85 Mon Sep 17 00:00:00 2001
From: "Begerad, Stefan" <dialog@swingbe.de>
Date: Fri, 6 Jan 2023 11:11:40 +0100
Subject: [PATCH] feat: add hello-world

---
 hello-world/main.c    | 109 ++++++++++++++++++++++++++++++++++++++++++
 hello-world/makefile  |  24 ++++++++++
 hello-world/readme.md |  11 +++++
 3 files changed, 144 insertions(+)
 create mode 100644 hello-world/main.c
 create mode 100644 hello-world/makefile
 create mode 100644 hello-world/readme.md

diff --git a/hello-world/main.c b/hello-world/main.c
new file mode 100644
index 0000000..f64e920
--- /dev/null
+++ b/hello-world/main.c
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef _WIN32
+  #include <sys/socket.h>
+  #include <netinet/in.h>
+  #include <arpa/inet.h>
+#endif
+
+#include <ulfius.h>
+//TODO Required? #include <u_example.h>
+
+#define PREFIX "/hello"
+
+/**
+ * callback functions declaration
+ */
+int callback_get_hello (const struct _u_request * request, struct _u_response * response, void * user_data);
+
+int callback_default (const struct _u_request * request, struct _u_response * response, void * user_data);
+
+int main(int argc, char *argv[]) {
+  /*declaration*/
+  struct _u_instance instance;
+  unsigned int port;
+  int ret;
+
+  printf("main() Started...\n");
+  if (argc != 2) {
+    fprintf(stderr, "Usage: ./main <port>\n");
+    exit(1);
+  }
+
+  printf("main() argv[1]: %s\n", argv[1]);
+
+  /*store command line argument in int variable*/
+  /*validate user input*/
+  /*omit injection*/
+  /*stream:argv*/
+  ret = sscanf(argv[1], "%d", &port);
+
+  /*valid user input:1 successfully filled item*/
+  if (ret != 1) {
+    fprintf(stderr, "The argument must be an integer\n");
+    exit(1);
+  }
+
+  if (port < 0) {
+    fprintf(stderr, "Error passing a negative port\n");
+    exit(1);
+  }
+  printf("main() port: %d\n", port);
+
+  if (ulfius_init_instance(&instance, port, NULL, NULL) != U_OK) {
+    printf("main() Error ulfius_init_instance, abort");
+    return(1);
+  }
+
+  //TODO Why?
+  u_map_put(instance.default_headers, "Access-Control-Allow-Origin", "*");  
+
+  // Maximum body size sent by the client is 1 Kb
+  instance.max_post_body_size = 1024;
+
+  // Endpoint list declaration
+  ulfius_add_endpoint_by_val(&instance, "GET", PREFIX, NULL, 0, &callback_get_hello, NULL);
+
+  // default_endpoint declaration
+  ulfius_set_default_endpoint(&instance, &callback_default, NULL);
+
+  // Start the framework
+  // Open an http connection
+  ret = ulfius_start_framework(&instance);
+
+  if (ret == U_OK) {
+    printf("main() Start framework on port %d", instance.port);
+    
+    // Wait for the user to press <enter> on the console to quit the application
+    getchar();
+  } else {
+    printf("main() Error starting framework\n");
+  }
+
+  printf("main() End framework\n");
+  
+  ulfius_stop_framework(&instance);
+  ulfius_clean_instance(&instance);
+
+  printf("main() Done.\n");
+
+  return 0;
+}
+    
+/**
+ * Callback function that put a "Hello World!" string in the response
+ */
+int callback_get_hello (const struct _u_request * request, struct _u_response * response, void * user_data) {
+  ulfius_set_string_body_response(response, 200, "Hello World!");
+  return U_CALLBACK_CONTINUE;
+}
+
+/**
+ * Default callback function called if no endpoint has a match
+ */
+int callback_default (const struct _u_request * request, struct _u_response * response, void * user_data) {
+  ulfius_set_string_body_response(response, 404, "Page not found, do what you want");
+  return U_CALLBACK_CONTINUE;
+}
diff --git a/hello-world/makefile b/hello-world/makefile
new file mode 100644
index 0000000..06166b4
--- /dev/null
+++ b/hello-world/makefile
@@ -0,0 +1,24 @@
+# Docu
+#
+#$@ is the name of the file to be made
+#$? is the names of the changed dependents
+#$< the name of the related file that caused the action
+#$* the prefix shared by target and dependent files
+#
+# Others
+RM      = /bin/rm -f
+#
+# Source, Executable, Includes, Library Defines
+EXE    = main
+#
+# Compiler, Linker Defines
+CC      = /usr/bin/gcc
+#
+all: main.o
+	$(CC) main.c -L/usr/lib/x86_64-linux-gnu -lulfius -Wall -o $(EXE)
+#
+main.o:
+	$(CC) -c main.c
+# Clean Up Objects, Exectuables, Dumps out of source directory
+clean:
+	$(RM) *.o $(EXE) *~
diff --git a/hello-world/readme.md b/hello-world/readme.md
new file mode 100644
index 0000000..fa95da0
--- /dev/null
+++ b/hello-world/readme.md
@@ -0,0 +1,11 @@
+* build
+
+```
+make
+```
+
+* run
+
+```
+tbd
+```