added configuration file support

main.c

@@ -1,6 +1,7 @@
 #include "network.h"
 #include "fuse_local.h"
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <getopt.h>
 #include <string.h>
@@ -12,6 +13,7 @@ static void print_help(char *program_name, int long_help);
 static void print_http_options();
 static int
 parse_arg_list(int argc, char **argv, char ***fuse_argv, int *fuse_argc);
+void parse_config_file(char ***fuse_argv, int *fuse_argc);
 
 int main(int argc, char **argv)
 {
@@ -37,6 +39,9 @@ int main(int argc, char **argv)
         goto fuse_start;
     }
 
+    /* parse the configuration file, if it exists */
+    parse_config_file(&fuse_argv, &fuse_argc);
+
     /* The second last remaining argument is the URL */
     char *base_url = argv[argc-2];
     if (strncmp(base_url, "http://", 7) && strncmp(base_url, "https://", 8)) {
@@ -56,6 +61,55 @@ int main(int argc, char **argv)
     return 0;
 }
 
+void parse_config_file(char ***fuse_argv, int *fuse_argc)
+{
+    char *home = getenv("HOME");
+    char *config_dir = "/.httpdirfs";
+    char *main_config_name = "/config";
+    int full_path_len = strnlen(home, 255) + strlen(config_dir) +
+    strlen(main_config_name) + 1;
+    char *full_path = calloc(full_path_len, sizeof(char *));
+    strncat(full_path, home, strnlen(home, 255));
+    strncat(full_path, config_dir, strlen(config_dir));
+    strncat(full_path, main_config_name, strlen(main_config_name));
+
+    int argc = 1;
+    char **argv = NULL;
+    /* The buffer has to be able to fit a URL */
+    int buf_len = URL_LEN_MAX;
+    char buf[buf_len];
+    FILE *config = fopen(full_path, "r");
+    if (config) {
+        argv = malloc(1 * sizeof(char *));
+        /*
+         * getopt_long() expects the first parameter to be the name of the
+         * program that was called.
+         */
+        argv[0] = "./httpdirfs";
+        while (fgets(buf, buf_len, config)) {
+            if (!strncmp(buf, "--", 2)) {
+                argc++;
+                buf[strnlen(buf, buf_len) - 1] = '\0';
+                char *space;
+                space = strchr(buf, ' ');
+                if (!space) {
+                    argv = realloc(argv, argc * sizeof(char *));
+                    argv[argc - 1] = strndup(buf, buf_len);
+                } else {
+                    argc++;
+                    argv = realloc(argv, argc * sizeof(char *));
+                    /* Only copy up to the space character*/
+                    argv[argc - 2] = strndup(buf, space - buf);
+                    /* Starts copying after the space */
+                    argv[argc - 1] = strndup(space + 1, buf_len);
+                }
+            }
+        }
+        parse_arg_list(argc, argv, fuse_argv, fuse_argc);
+        free(argv);
+    }
+}
+
 static int
 parse_arg_list(int argc, char **argv, char ***fuse_argv, int *fuse_argc)
 {
@@ -63,19 +117,21 @@ parse_arg_list(int argc, char **argv, char ***fuse_argv, int *fuse_argc)
     int long_index = 0;
     const char *short_opts = "o:hVdfsp:u:P:";
     const struct option long_opts[] = {
-        {"help", no_argument, NULL, 'h'},               /* 0 */
-        {"version", no_argument, NULL, 'V'},            /* 1 */
-        {"debug", no_argument, NULL, 'd'},              /* 2 */
-        {"user", required_argument, NULL, 'u'},         /* 3 */
-        {"password", required_argument, NULL, 'p'},     /* 4 */
-        {"proxy", required_argument, NULL, 'P'},        /* 5 */
-        {"proxy-user", required_argument, NULL, 'L'},   /* 6 */
-        {"proxy-pass", required_argument, NULL, 'L'},   /* 7 */
+        /* Note that 'L' is returned for long options */
+        {"help", no_argument, NULL, 'h'},                   /* 0 */
+        {"version", no_argument, NULL, 'V'},                /* 1 */
+        {"debug", no_argument, NULL, 'd'},                  /* 2 */
+        {"username", required_argument, NULL, 'u'},         /* 3 */
+        {"password", required_argument, NULL, 'p'},         /* 4 */
+        {"proxy", required_argument, NULL, 'P'},            /* 5 */
+        {"proxy-username", required_argument, NULL, 'L'},   /* 6 */
+        {"proxy-password", required_argument, NULL, 'L'},   /* 7 */
         {0, 0, 0, 0}
     };
     while ((c =
         getopt_long(argc, argv, short_opts, long_opts,
                     &long_index)) != -1) {
+        printf("c: %c\n", c);
         switch (c) {
             case 'o':
                 add_arg(fuse_argv, fuse_argc, "-o");
@@ -107,6 +163,7 @@ parse_arg_list(int argc, char **argv, char ***fuse_argv, int *fuse_argc)
                 NETWORK_CONFIG.proxy = strndup(optarg, URL_LEN_MAX);
                 break;
             case 'L':
+                /* Long options */
                 switch (long_index) {
                     case 6:
                         NETWORK_CONFIG.proxy_user = strndup(optarg,
@@ -158,12 +215,12 @@ static void print_http_options()
 {
     fprintf(stderr,
 "HTTP options:\n\
-    -u   --user            HTTP authentication username\n\
+    -u   --username        HTTP authentication username\n\
     -p   --password        HTTP authentication password\n\
     -P   --proxy           Proxy for libcurl, for more details refer to\n\
         https://curl.haxx.se/libcurl/c/CURLOPT_PROXY.html\n\
-         --proxy-user      Username for the proxy\n\
-         --proxy-pass      Password for the proxy\n\
+         --proxy-username      Username for the proxy\n\
+         --proxy-password      Password for the proxy\n\
     \n\
 libfuse options:\n");
 }