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, 9 insertions, 2 deletions

diff --git a/src/lsh_builtins.c b/src/lsh_builtins.c
index dda49c4..51a44cd 100644
--- a/src/lsh_builtins.c
+++ b/src/lsh_builtins.c
@@ -40,6 +40,7 @@ int lsh_num_builtins() {
 /*
    Builtin function implementations.
    */
+#define LSH_CWD_BUF_SIZE 1024;
 int lsh_cd(char **args)
 {
     if (args[1] == NULL) {
@@ -49,8 +50,14 @@ int lsh_cd(char **args)
         if (err != 0) {
             perror("lsh");
         }
-        char *cwd=(char*)malloce(sizeof(char)*4096);
-        getcwd(cwd,sizeof(char*)*4096);
+
+        int bufsize=LSH_CWD_BUF_SIZE;
+        char *cwd=(char*)malloce(sizeof(char)*bufsize+1);
+        while(getcwd(cwd,sizeof(char)*bufsize)==NULL){
+            bufsize += LSH_CWD_BUF_SIZE;
+            cwd=(char*)realloce(cwd,sizeof(char)*bufsize+1);
+        }
+
         setenv("PWD",cwd,1);
         free(cwd);
     }