add curl example

network/curl/source/main.c

@@ -0,0 +1,122 @@
+// Include the most common headers from the C standard library
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Include the main libnx system header, for Switch development
+#include <switch.h>
+							
+//include Curl library
+#include <curl/curl.h>
+
+//include for printfile
+#include <errno.h>
+
+
+//read "printfile" function by switchbrew for switch-examples (https://github.com/switchbrew/switch-examples/blob/master/fs/romfs).
+void printfile(const char* path)
+{
+    FILE* f = fopen(path, "r");
+    if (f)
+    {
+        char mystring[100];
+        while (fgets(mystring, sizeof(mystring), f))
+        {
+            int a = strlen(mystring);
+            if (mystring[a-1] == '\n')
+            {
+                mystring[a-1] = 0;
+                if (mystring[a-2] == '\r')
+                    mystring[a-2] = 0;
+            }
+            puts(mystring);
+        }
+        printf(">>EOF<<\n");
+        fclose(f);
+    } else {
+        printf("errno is %d, %s\n", errno, strerror(errno));
+    }
+}
+
+
+//curl "downloadFile" function by @segfault42 for NXDownload project (https://github.com/Dontwait00/nXDownload).
+bool    downloadFile(const char *url, const char *filename)
+{
+    FILE                *dest = NULL;
+    CURL                *curl = NULL;
+    CURLcode            res = -1;
+
+    consoleClear();
+
+    curl = curl_easy_init();
+    
+    if (curl) {
+        dest = fopen(filename, "wb");
+        if (dest == NULL) {
+            perror("fopen");
+        } else {
+            curl_easy_setopt(curl, CURLOPT_URL, url);                        // getting URL from char *url
+            curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);                    // useful for debugging
+            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);             // skipping cert. verification, if needed
+            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);             // skipping hostname verification, if needed
+            curl_easy_setopt(curl, CURLOPT_WRITEDATA, dest);                // writes pointer into FILE *destination
+            
+            res = curl_easy_perform(curl);                                    // perform tasks curl_easy_setopt asked before
+            
+            fclose(dest);
+        }
+    }
+
+    curl_easy_cleanup(curl);                                                // Cleanup chunk data, resets functions.
+
+    if (res != CURLE_OK) {
+        printf("\n# Failed: %s%s%s\n", CONSOLE_RED, curl_easy_strerror(res), CONSOLE_RESET);
+        remove(filename);
+        return false;
+    }
+    
+    return true;
+}
+
+
+int main()
+{
+
+    consoleInit(NULL);
+	//Initialize curl
+	socketInitializeDefault();
+
+//print instructions.
+printf("Curl Example\n");
+printf("Press A to download [https://raw.githubusercontent.com/switchbrew/switch-examples/master/README.md].\nPress + to exit\n");
+
+
+    while (appletMainLoop())
+    {
+        hidScanInput();
+
+        u64 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
+
+        if (kDown & KEY_PLUS)
+            break; // break in order to return to hbmenu
+
+		if (kDown & KEY_A)
+		{
+			//download argument, downloadFile("URL", "sdmc:/path/to/file.txt");
+            downloadFile("https://raw.githubusercontent.com/switchbrew/switch-examples/master/README.md", "sdmc:/switch/example.txt");
+			consoleClear();
+			printf("Showing the example downloaded!\n");
+			printfile("sdmc:/switch/example.txt");
+	}
+			
+			
+
+        consoleUpdate(NULL);
+    }
+
+    // Deinitialize and clean up resources used by the console (important!)
+    consoleExit(NULL);
+	//deinitialize curl
+	socketExit();
+    return 0;
+}