Read from config

lw12ctl.c

@@ -9,6 +9,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <unistd.h>
+#include <pwd.h>
 
 #include <readline/readline.h>
 #include <readline/history.h>
@@ -18,6 +19,11 @@
 #define DebugPrintPos fprintf(stderr, "%s:%d\n", __FILE__, __LINE__)
 
 
+struct config {
+    char *host;
+    int port;
+};
+
 int exit_interactive_session = 0;
 int sockfd = 0;
 struct sockaddr_in server_addr;
@@ -215,15 +221,77 @@ void cmd_loop() {
     } while (!exit_interactive_session);
 }
 
+int read_conf(const char *filename, struct config *conf){
+    FILE *fd;
+    const size_t line_size = 300;
+    char *line = (char *)malloc(line_size);
+    char *start_pos, *pos;
+    char *value = NULL;
+
+    // set default
+    conf->host = NULL;
+    conf->port = 5000;
+
+    // read config
+    fd = fopen(filename, "r");
+    if (fd) {
+        while (fgets(line, line_size, fd) != NULL) {
+            pos = line;
+            while (*pos == ' ')
+                pos++;
+            if (*pos == '#' || *pos == '\n')
+                continue;
+
+            start_pos = pos;
+            while (*pos != '\0') {
+                if (*pos == '\n') {
+                    *pos = '\0';
+                    break;
+                }
+                pos++;
+            }
+
+            value = strrchr(start_pos, '=');
+            start_pos[value - start_pos - 1] = '\0';
+            while (*value == ' ' || *value == '=')
+                value++;
+
+            if (strncasecmp(start_pos, "host", 4) == 0) {
+                size_t param_len = strlen(value);
+                conf->host = (char *)malloc(param_len);
+                strncpy(conf->host, value, param_len);
+            } else if (strncasecmp(start_pos, "port", 4) == 0) {
+                conf->port = atoi(value);
+            }
+        }
+    }
+
+    free(line);
+    return 0;
+}
+
 int main() {
-    char serverip[] = "192.168.178.24";
-    uint16_t serverport = 5000;
+    struct passwd *pw = getpwuid(getuid());
+    const char *homedir = pw->pw_dir;
+    char confpath[510] = {};
+    struct config conf;
+
+    strcat(confpath, homedir);
+    strcat(confpath, "/.lw12rc");
+    read_conf(confpath, &conf);
+    if (conf.host == NULL) {
+        fprintf(stderr, "Option 'host' is missing or not set in config.\n");
+        return 1;
+    }
 
     rl_bind_key('\t', rl_abort);
 
-    lw12_connect(&sockfd, &server_addr, serverport, serverip);
+    lw12_connect(&sockfd, &server_addr, conf.port, conf.host);
     cmd_loop();
     close(sockfd);
 
+    // Clean config environment
+    free(conf.host);
+
     return 0;
 }