Shell-in-C/env.h at master · vasu0403/Shell-in-C · GitHub

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void set_env(char *command)
{
	char *end_cmd;
	char *token = strtok_r(command, " ", &end_cmd);
	char *var = (char *)malloc(max_len * sizeof(char));
	char *val = (char *)malloc(max_len * sizeof(char));
	if(strlen(end_cmd)==0)
	{
		printf("Invalid number of arguments\n");
		return;
	}
	token = strtok_r(NULL, " ", &end_cmd);
	strcpy(var, token);
	if(strlen(end_cmd)==0)
		strcpy(val, "");
	else
	{
		token = strtok_r(NULL, " ", &end_cmd);
		strcpy(val, token);
	}
	if(strlen(end_cmd)!=0)
	{
		printf("Invalid number of arguments\n");
		return;
	}
	if(setenv(var, val, 1)!=0)
		perror("Error");
	return;
}
void unset_env(char *command)
{
	char *end_cmd;
	char *token = strtok_r(command, " ", &end_cmd);
	if(strlen(end_cmd) == 0)
	{
		printf("Invalid number of arguments\n");
		return;
	}
	token = strtok_r(NULL, " ", &end_cmd);
	if(strlen(end_cmd) != 0)
	{
		printf("Invalid number of arguments\n");
		return;
	}
	if(unsetenv(token)!=0)
		perror("Error");
	return;
}