1.2.7.4.21 SYS_FS_FileTruncate Function

SYS_FS_RESULT SYS_FS_FileTruncate
(
    SYS_FS_HANDLE handle
);

Truncates a file.

This function truncates the file size to the current file read/write pointer. This function has no effect if the file read/write pointer is already pointing to end of the file.

A valid file handle has to be passed as input to the function. The file has to be opened in a mode where writes to file is possible, such as read plus or write mode.

SYS_FS_RES_SUCCESS - File truncate operation was successful.

SYS_FS_RES_FAILURE - File truncate operation was unsuccessful. The reason for the failure can be retrieved with SYS_FS_Error or SYS_FS_FileError.

SYS_FS_HANDLE fileHandle;
size_t nbytes;
size_t bytes_read;
SYS_FS_RESULT res;

fileHandle = SYS_FS_FileOpen("/mnt/myDrive/FILE.JPG", (SYS_FS_FILE_OPEN_READ));

if(fileHandle != SYS_FS_HANDLE_INVALID)
{
    // File open is successful
}

// Read the file content
nbytes = sizeof(buf);
bytes_read = SYS_FS_FileRead(fileHandle, buf, nbytes);

// Truncate the file
res = SYS_FS_FileTruncate(fileHandle);

if(res != SYS_FS_RES_SUCCESS)
{
    // Truncation failed.
}

SYS_FS_FileClose(fileHandle);

None.