config. getenv variables

Signed-off-by: Viktar Lukashonak <[email protected]>

config.c

@@ -469,6 +469,41 @@ bool load_config(char configPath[PATH_MAX], struct config_params *p, bool colors
         }
 
     } else { // opening specified file
+        // expand env variables in configPath
+        char *cfgPathOrig = (char*)malloc(PATH_MAX*sizeof(char));
+        strcpy(cfgPathOrig, configPath);
+        configPath[0] = '\0';
+
+        const char *delimiter = "/";
+        char *pch_1 = cfgPathOrig;
+        char *pch_2 = strpbrk(pch_1 + 1, delimiter); // search for the first delimiter
+        char *env = NULL;
+        int lag = 0;  // manages the lag where to look $ after strpbrk
+
+        while (pch_2 != NULL) {
+            char *dest = (char*)malloc((pch_2 - pch_1 - 1)*sizeof(char));
+            strncpy(dest, pch_1, (pch_2 - pch_1));
+
+            if (*(dest + lag) == '$') {
+                env = getenv(dest + lag + 1);
+
+                if (env != NULL) {
+                    if (lag > 0 && env != delimiter)
+                        strcat(configPath, delimiter);
+                    strcat(configPath, env);
+                } else
+                    strcat(configPath, dest);
+            } else
+                strcat(configPath, dest);
+
+            free(dest);
+            lag = 1;
+            pch_1 = pch_2;
+            pch_2 = strpbrk(pch_1 + 1, delimiter);
+        }
+
+        strcat(configPath, pch_1);
+        free(cfgPathOrig);
 
         fp = fopen(configPath, "rb");
         if (fp) {