transfer: add support for uploading multiple files

* This commit makes transfer capable of uploading multiple files supplied in a single argument in a single go!

Fixes #7

Signed-off-by: dev-harsh1998 <harshitjain6751@gmail.com>

Author: dev-harsh1998

Makefile

@@ -5,7 +5,7 @@
 #
 
 # Issue 1 file size
-CFLAGS="-DGET_FILE_SIZE" "-Wall" "-DPROGRESS_BAR"
+CFLAGS="-DGET_FILE_SIZE" "-Wall" "-DPROGRESS_BAR" "-DUPLOAD_MULTIPLE"
 
 CC ?= gcc
 CLANG_FORMAT ?= clang-format

transfer.c

@@ -16,6 +16,10 @@
 #include <sys/types.h>
 #endif
 
+static inline char uploader(char s[]){
+    return system(s);
+}
+
 /* Implementation based on popen documentation */
 static bool can_run_command(const char *cmd) {
     if (strchr(cmd, '/')) {
@@ -70,20 +74,56 @@ int main(int argc, char *argv[]) {
     /* Linux curl check */
     const char curl[5] = "curl";
     static bool x;
+
+#ifdef UPLOAD_MULTIPLE 
+    int holder = argc;
+    int q;
+#endif 
+
     x = can_run_command(curl);
     /* Only run the uploader when curl binary is found & is executable */
     if (x) {
+
+#ifdef UPLOAD_MULTIPLE       
+        /* Argument check */
+        if (argc <= 2) {
+            printf("ERROR: This binary expects atleast one command "
+                   "line argument\n");
+            /* bail out */
+            return -1;
+        }
+        if (argc > 2) {
+            printf("The no of files that are going to be uploaded are %d\n",argc - 1);
+        }
+        printf("\n");
+        /* Display names of file (Ignore the first argument as its transfer itself) */
+        for (q = 1; q < holder; q++) { 
+            printf("File no. %d is %s\n", q, argv[q]);
+        }
+        printf("\n");
+        printf ("The above listed files would be uploaded now.\n\n");
+#else
         /* Argument check */
         if (argc != 2) {
             printf("ERROR: This binary expects atleast and only one command "
                    "line argument\n");
             /* bail out */
             return -1;
         }
+#endif
 
 #ifdef GET_FILE_SIZE
         if (getenv("TRANSFER_DISABLE_FILESIZE") == NULL) {
             static struct stat st;
+#ifdef UPLOAD_MULTIPLE
+        for (q = 1; q < holder; q++) { 
+            stat(argv[q], &st);
+            const float mb = st.st_size / 1048576;
+            printf("The size of the %d file going to be uploaded is near to %.2f "
+                   "megabytes\n", q, mb);
+        }
+        }
+#else
             stat(argv[1], &st);
             // convert bytes to mb (devide by 1024*1024)
             const float mb = st.st_size / 1048576;
@@ -92,18 +132,33 @@ int main(int argc, char *argv[]) {
                    mb);
         }
 #endif
-
+        printf("\n");
+#endif
         static char cmdbuf[256];
         static int ret;
 
 #ifdef PROGRESS_BAR
+#ifdef UPLOAD_MULTIPLE
+        for (q = 1; q < holder; q++) {
+        sprintf(cmdbuf, "curl --progress-bar -T %s %s | tee /dev/null", argv[q], "https://transfer.sh");
+        ret = uploader(cmdbuf);
+        printf("\n");
+        }
+#else
         sprintf(cmdbuf, "curl --progress-bar -T %s %s | tee /dev/null", argv[1], "https://transfer.sh");
+        ret = uploader(cmdbuf);
+#endif
+#else
+#ifdef UPLOAD_MULTIPLE
+        for (q = 1; q < holder; q++) { 
+        sprintf(cmdbuf, "curl -T %s %s", argv[q], "https://transfer.sh");
+        ret = uploader(cmdbuf);
+        printf("\n");
+        }
 #else
         sprintf(cmdbuf, "curl -T %s %s", argv[1], "https://transfer.sh");
 #endif
-
-        ret = system(cmdbuf);
-        printf("\n");
+#endif
         return ret;
     } else {
         printf("Either curl binary is not installed or is corrupt somehow, "