some cleanup and shell var

- SHELL is now set
- cwd now has realloc
- realloc with error checking is now a fucntion like malloce

1 files changed, 23 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 427d316..ef88291 100755
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <sys/param.h>
+#include <errno.h>
 
 #include "main.h"
 #include "helper_functions.c"
@@ -18,6 +20,11 @@ void lsh_loop(SHELL_OB *shell_obj){
         //get pwd
         char *cwd= getenv("PWD");
         char *pwd=basename(cwd);
+        if(pwd==NULL){
+            fprintf(stderr,"lsh:pwd is null\n\n");
+            exit(EXIT_FAILURE);
+        }
+
         snprintf(shell_obj->prompt,sizeof(char) * 1024,"%s %s> ",shell_obj->pre_prompt,pwd);
         free(pwd);
         printf("%s",shell_obj->prompt);
@@ -46,6 +53,18 @@ void lsh_loop(SHELL_OB *shell_obj){
     } while (status);
 }
 
+static char* call_realpath (char * argv0) {
+    char* resolved_path=(char*)malloce(sizeof(char)*PATH_MAX);
+
+    if (realpath (argv0, resolved_path) == 0) { 
+        fprintf (stderr, "lsh: realpath failed: %s\n", strerror (errno));
+        exit(errno);
+    }
+    else {
+        return resolved_path;
+    }
+}
+
 int main(int argc, char **argv){
     //set sh level
     char *shlvl = getenv("SHLVL");
@@ -56,6 +75,9 @@ int main(int argc, char **argv){
         setenv("SHLVL",shlvl,1);
     }
 
+    char* prog_path = call_realpath(argv[0]);
+    setenv("SHELL",prog_path,1);
+
     //Set The prompt
     SHELL_OB shell_obj;
     shell_obj.prompt = (char *)malloce(sizeof(char) * 1024);
@@ -73,5 +95,6 @@ int main(int argc, char **argv){
 
     free(shell_obj.prompt);
     free(shell_obj.pre_prompt);
+    free(prog_path);
     return EXIT_SUCCESS;
 }