diff options
Diffstat (limited to 'winsup/cygwin/miscfuncs.cc')
| -rw-r--r-- | winsup/cygwin/miscfuncs.cc | 78 |
1 files changed, 77 insertions, 1 deletions
diff --git a/winsup/cygwin/miscfuncs.cc b/winsup/cygwin/miscfuncs.cc index b2da91846..241819460 100644 --- a/winsup/cygwin/miscfuncs.cc +++ b/winsup/cygwin/miscfuncs.cc @@ -1,7 +1,7 @@ /* miscfuncs.cc: misc funcs that don't belong anywhere else Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, - 2007, 2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc. + 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 Red Hat, Inc. This file is part of Cygwin. @@ -384,6 +384,82 @@ WritePipeOverlapped (HANDLE h, LPCVOID buf, DWORD len, LPDWORD ret_len, return ret; } +bool +NT_readline::init (POBJECT_ATTRIBUTES attr, PCHAR in_buf, ULONG in_buflen) +{ + NTSTATUS status; + IO_STATUS_BLOCK io; + + status = NtOpenFile (&fh, SYNCHRONIZE | FILE_READ_DATA, attr, &io, + FILE_SHARE_VALID_FLAGS, + FILE_SYNCHRONOUS_IO_NONALERT + | FILE_OPEN_FOR_BACKUP_INTENT); + if (!NT_SUCCESS (status)) + { + paranoid_printf ("NtOpenFile(%S) failed, status %y", + &attr->ObjectName, status); + return false; + } + buf = in_buf; + buflen = in_buflen; + got = end = buf; + len = 0; + line = 1; + return true; +} + +PCHAR +NT_readline::gets () +{ + IO_STATUS_BLOCK io; + + while (true) + { + /* len == 0 indicates we have to read from the file. */ + if (!len) + { + if (!NT_SUCCESS (NtReadFile (fh, NULL, NULL, NULL, &io, got, + (buflen - 2) - (got - buf), NULL, NULL))) + return NULL; + len = io.Information; + /* Set end marker. */ + got[len] = got[len + 1] = '\0'; + /* Set len to the absolute len of bytes in buf. */ + len += got - buf; + /* Reset got to start reading at the start of the buffer again. */ + got = end = buf; + } + else + { + got = end + 1; + ++line; + } + /* Still some valid full line? */ + if (got < buf + len) + { + if ((end = strchr (got, '\n'))) + { + end[end[-1] == '\r' ? -1 : 0] = '\0'; + return got; + } + /* Last line missing a \n at EOF? */ + if (len < buflen - 2) + { + len = 0; + return got; + } + } + /* We have to read once more. Move remaining bytes to the start of + the buffer and reposition got so that it points to the end of + the remaining bytes. */ + len = buf + len - got; + memmove (buf, got, len); + got = buf + len; + buf[len] = buf[len + 1] = '\0'; + len = 0; + } +} + /* backslashify: Convert all forward slashes in src path to back slashes in dst path. Add a trailing slash to dst when trailing_slash_p arg is set to 1. */ |