diff options
Diffstat (limited to 'src/fullio.c')
-rw-r--r-- | src/fullio.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/fullio.c b/src/fullio.c new file mode 100644 index 0000000..9e401da --- /dev/null +++ b/src/fullio.c @@ -0,0 +1,70 @@ +/* This file is part of GDBM, the GNU data base manager. + Copyright (C) 2011 Free Software Foundation, Inc. + + GDBM is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + GDBM is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with GDBM. If not, see <http://www.gnu.org/licenses/>. */ + +#include "autoconf.h" +#include "gdbmdefs.h" + +/* Read exactly SIZE bytes of data into BUFFER. Return value is 0 on + success, GDBM_FILE_EOF, if not enough data is available, and + GDBM_FILE_READ_ERROR, if a read error occurs. In the latter case + errno keeps actual system error code. */ +int +_gdbm_full_read (GDBM_FILE dbf, void *buffer, size_t size) +{ + char *ptr = buffer; + while (size) + { + ssize_t rdbytes = __read (dbf, ptr, size); + if (rdbytes == -1) + { + if (errno == EINTR) + continue; + return GDBM_FILE_READ_ERROR; + } + if (rdbytes == 0) + return GDBM_FILE_EOF; + ptr += rdbytes; + size -= rdbytes; + } + return 0; +} + +/* Write exactly SIZE bytes of data from BUFFER tp DBF. Return 0 on + success, and GDBM_FILE_READ_ERROR on error. In the latter case errno + will keep actual system error code. */ +int +_gdbm_full_write (GDBM_FILE dbf, void *buffer, size_t size) +{ + char *ptr = buffer; + while (size) + { + ssize_t wrbytes = __write (dbf, ptr, size); + if (wrbytes == -1) + { + if (errno == EINTR) + continue; + return GDBM_FILE_WRITE_ERROR; + } + if (wrbytes == 0) + { + errno = ENOSPC; + return GDBM_FILE_WRITE_ERROR; + } + ptr += wrbytes; + size -= wrbytes; + } + return 0; +} |