environment vairables. set and get

src/lsh_builtins.c

@@ -13,6 +13,7 @@
 int lsh_cd(char **args);
 int lsh_help(char **args);
 int lsh_exit(char **args);
+int export(char **args);
 
 /*
    List of builtin commands, followed by their corresponding functions.
@@ -20,13 +21,15 @@ int lsh_exit(char **args);
 char *builtin_str[] = {
     "cd",
     "help",
-  "exit"
+    "exit",
+    "export"
 };
 
 int (*builtin_func[]) (char **) = {
     &lsh_cd,
     &lsh_help,
-  &lsh_exit
+    &lsh_exit,
+    &export
 };
 
 int lsh_num_builtins() {
@@ -35,7 +38,7 @@ int lsh_num_builtins() {
 
 /*
    Builtin function implementations.
-*/
+   */
 int lsh_cd(char **args)
 {
     if (args[1] == NULL) {
@@ -68,6 +71,28 @@ int lsh_exit(char **args)
     return 0;
 }
 
+int export(char **args){
+    char *token;
+    int position = 0;
+    char *key = NULL;
+    char *value = NULL;
+
+    token = strtok(args[1], "=\r\n");
+    while (token != NULL) {
+        if(position == 0){
+            key=token;
+        } else if(position == 1){
+            value=token;
+        }
+
+        position++;
+        token = strtok(NULL, "=\r\n");
+    }
+    setenv(key,value,1);
+
+    return 1;
+}
+
 
 
 int lsh_execute(char **args)
@@ -87,5 +112,4 @@ int lsh_execute(char **args)
 
     return lsh_launch(args);
 }
-
 #endif

src/lsh_main_func.c

@@ -45,6 +45,14 @@ char *lsh_read_line(void)
     }
 }
 
+char *handle_vars(char *token){
+    if (token[0] == '$'){
+        token=&token[1];
+        token=getenv(token);
+    }
+    return token;
+}
+
 #define LSH_TOK_BUFSIZE 64
 #define LSH_TOK_DELIM " \t\r\n\a"
 char **lsh_split_line(char *line)
@@ -60,9 +68,11 @@ char **lsh_split_line(char *line)
 
     token = strtok(line, LSH_TOK_DELIM);
     while (token != NULL) {
+        token = handle_vars(token);
         tokens[position] = token;
         position++;
 
+
         if (position >= bufsize) {
             bufsize += LSH_TOK_BUFSIZE;
             tokens = realloc(tokens, bufsize * sizeof(char*));

src/main.c

@@ -1,7 +1,5 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
-#include <sys/wait.h>
 #include <unistd.h>
 
 #include "lsh_main_func.c"
@@ -30,15 +28,17 @@ void lsh_loop(SHELL_OB *shell_obj)
 
 int main(int argc, char **argv){
     SHELL_OB shell_obj;
+    shell_obj.prompt = (char *)malloc(sizeof(char) * 1024);
 
     //get the hostname
     char *hostname = (char *)malloc(sizeof(char) * 1024);
     gethostname(hostname,sizeof(char) * 1024);
 
-    shell_obj.prompt=strcat(strcat(strcat(getenv("USER"), "@"), (char *)hostname), "> ");
+    snprintf(shell_obj.prompt,sizeof(char) * 1024,"%s@%s> ",getenv("USER"),hostname);
 
     lsh_loop(&shell_obj);
 
     free(hostname);
+    free(shell_obj.prompt);
     return EXIT_SUCCESS;
 }