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//! @file getlinkcount.cpp
//! @author George FLeming <v-geflem@microsoft.com>
//! @brief Retrieve link count of a file
#include <errno.h>
#include <locale.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include "getlinkcount.h"
//! @brief GetLinkCount retrieves the file link count (number of hard links)
//! for the given file
//!
//! GetLinkCount
//!
//! @param[in] fileName
//! @parblock
//! A pointer to the buffer that contains the file name
//!
//! char* is marshaled as an LPStr, which on Linux is UTF-8.
//! @endparblock
//!
//! @param[out] count
//! @parblock
//! This function returns the number of hard links associated with this file
//! @endparblock
//!
//! @exception errno Passes these errors via errno to GetLastError:
//! - ERROR_INVALID_PARAMETER: parameter is not valid
//! - ERROR_FILE_NOT_FOUND: file does not exist
//! - ERROR_ACCESS_DENIED: access is denied
//! - ERROR_FILE_NOT_FOUND: the system cannot find the file specified
//! - ERROR_INVALID_ADDRESS: attempt to access invalid address
//! - ERROR_STOPPED_ON_SYMLINK: the operation stopped after reaching a symbolic link
//! - ERROR_GEN_FAILURE: device attached to the system is not functioning
//! - ERROR_NO_SUCH_USER: there was no corresponding entry in the utmp-file
//! - ERROR_INVALID_NAME: filename, directory name, or volume label syntax is incorrect
//! - ERROR_BUFFER_OVERFLOW: file name is too long
//! - ERROR_INVALID_FUNCTION: incorrect function
//! - ERROR_BAD_PATH_NAME: pathname is too long, or contains invalid characters
//!
//! @retval 1 If the function succeeds, and the variable pointed to by buffer contains
//! information about the files
//! @retval 0 If the function fails, the return value is zero. To get
//! extended error information, call GetLastError.
//!
int32_t GetLinkCount(const char* fileName, int32_t *count)
{
errno = 0;
// Check parameters
if (!fileName)
{
errno = ERROR_INVALID_PARAMETER;
return 0;
}
struct stat statBuf;
int returnCode = lstat(fileName, &statBuf);
if (returnCode != 0)
{
switch(errno)
{
case EACCES:
errno = ERROR_ACCESS_DENIED;
break;
case EBADF:
errno = ERROR_FILE_NOT_FOUND;
break;
case EFAULT:
errno = ERROR_INVALID_ADDRESS;
break;
case ELOOP:
errno = ERROR_STOPPED_ON_SYMLINK;
break;
case ENAMETOOLONG:
errno = ERROR_GEN_FAILURE;
break;
case ENOENT:
errno = ERROR_FILE_NOT_FOUND;
break;
case ENOMEM:
errno = ERROR_NO_SUCH_USER;
break;
case ENOTDIR:
errno = ERROR_INVALID_NAME;
break;
case EOVERFLOW:
errno = ERROR_BUFFER_OVERFLOW;
break;
default:
errno = ERROR_INVALID_FUNCTION;
}
return 0;
}
*count = statBuf.st_nlink;
return 1;
}