cwd.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <pwd.h>
#include <sys/types.h>

#include "commands.h"
#include "cwd.h"
#include "logging.h"
#include "mystring.h"

char *cwd = NULL;

int bftpd_cwd_chdir(char *dir)
{
	char *tmp = bftpd_cwd_mappath(dir);
        if (! tmp)
           return -1;
	if (chdir(tmp)) {
		free(tmp);
		return errno;
	}
	cwd = realloc(cwd, strlen(tmp) + 1);
        if (! cwd)
        {
           free(tmp);
           return -1;
        }
	strcpy(cwd, tmp);
	new_umask();
	free(tmp);
	return 0;
}

char *bftpd_cwd_getcwd()
{
      if (cwd)
	 return strdup(cwd);
      else
         return NULL;
}

void appendpath(char *result, char *tmp)
{
	if (!strcmp(tmp, "."))
		return;
	if (!strcmp(tmp, "..")) {
        if (strcmp(result, "/")) {
            if (result[strlen(result) - 1] == '/')
                result[strlen(result) - 1] = '\0';
            tmp = result;
            while (strchr(tmp, '/'))
                tmp = strchr(tmp, '/') + 1;
            *tmp = '\0';
            if ((result[strlen(result) - 1] == '/') && (strlen(result) > 1))
                result[strlen(result) - 1] = '\0';
        }
	} else {
		if (result[strlen(result) - 1] != '/')
			strcat(result, "/");
		strcat(result, tmp);
	}
}



char *bftpd_cwd_mappath(char *path)
{
	char *result = malloc(strlen(path) + strlen(cwd) + 16);
	char *path2;
	char *tmp;

        if (! result)
           return NULL;
        path2 = strdup(path);
        if (! path2)
        {
           free(result);
           return NULL;
        }

	if (path[0] == '/')
		strcpy(result, "/");
	else
		strcpy(result, cwd);

	while (strchr(path2, '/')) {
		tmp = strdup(path2);
                if (tmp)
                {
		  *strchr(tmp, '/') = '\0';
		  cutto(path2, strlen(tmp) + 1);
		  appendpath(result, tmp);
		  free(tmp);
                }
	}
	appendpath(result, path2);
	free(path2);
	return result;
}

void bftpd_cwd_init()
{
	cwd = malloc(256);
	getcwd(cwd, 255);
}

void bftpd_cwd_end()
{
	if (cwd) {
		free(cwd);
		cwd = NULL;
	}
}