Merge pull request #22 from maqamylee0/peter_shell

incomplete implementation of cd

_getenv.c

@@ -0,0 +1,31 @@
+#include "main.h"
+
+/**
+ * _getenv - gets an environment variable
+ * @name: name of the variable
+ * @env: environment variables
+ *
+ * Return: pointer to variable or NULL (not found)
+ */
+char *_getenv(const char *name, char **env)
+{
+	char *value = NULL;
+	char *temp;
+	int i, j;
+
+	i = 0;
+	while (env[i] != NULL)
+	{
+		j = 0;
+		temp = env[i];
+		while (name[j] != '\0' && name[j] == temp[j])
+			j++;
+		if (name[j] == '\0' && temp[j] == '=')
+		{
+			value = temp + j + 1;
+			break;
+		}
+		i++;
+	}
+	return (value);
+}

execute.c

@@ -10,7 +10,22 @@ void execute(char **argv, char **env)
 {
 	pid_t pid;
 	int status;
-	char *cmd_path = NULL;
+	char *cmd_path = NULL, *cmd = NULL;
+
+	if (_strcmp(argv[0], "cd") == 0)
+	{
+		cmd = get_cd_path(argv, env);
+		if (chdir(cmd) != -1)
+		{
+			;
+		}
+		if (_strcmp(argv[1], "-") == 0)
+		{
+			_puts(cmd);
+			_putchar('\n');
+		}
+		return;
+	}
 
 	if (_strchr(argv[0], '/') != NULL)
 	{

get_cd_path.c

@@ -0,0 +1,27 @@
+#include "main.h"
+
+/**
+ * get_cd_path - gets path for cd
+ * @argv: array of arguments
+ * @env: environment variable
+ *
+ * Return: path to change directory to
+ */
+char *get_cd_path(char **argv, char **env)
+{
+	char *path = NULL;
+
+	if (argv[1] == NULL)
+	{
+		path = _getenv("HOME", env);
+	}
+	else if (_strcmp(argv[1], "-") == 0)
+	{	
+		path = _getenv("OLDPWD", env);
+	}
+	else
+	{
+		path = argv[1];
+	}
+	return (path);
+}

main.h

@@ -39,5 +39,7 @@ int has_space(char *input);
 int _isletter(int c);
 char *_realloc(char *ptr, size_t size);
 char *_strtok(char *str, const char *delim);
+char *_getenv(const char *name, char **env);
+char *get_cd_path(char **argv, char **env);
 
 #endif /* _MAIN__H_ */