Return to fs.c CVS log

Up to [Coherent Logic Development] / freem / src

Annotation of freem/src/fs.c, revision 1.3

1.1       snw         1: /*
1.3     ! snw         2:  *   $Id$
1.1       snw         3:  *    filesystem support functions
                      4:  *
                      5:  *  
1.2       snw         6:  *   Author: Serena Willis <snw@coherent-logic.com>
1.1       snw         7:  *    Copyright (C) 1998 MUG Deutschland
1.3     ! snw         8:  *    Copyright (C) 2024, 2025 Coherent Logic Development LLC
1.1       snw         9:  *
                     10:  *
                     11:  *   This file is part of FreeM.
                     12:  *
                     13:  *   FreeM is free software: you can redistribute it and/or modify
                     14:  *   it under the terms of the GNU Affero Public License as published by
                     15:  *   the Free Software Foundation, either version 3 of the License, or
                     16:  *   (at your option) any later version.
                     17:  *
                     18:  *   FreeM is distributed in the hope that it will be useful,
                     19:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
                     20:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     21:  *   GNU Affero Public License for more details.
                     22:  *
                     23:  *   You should have received a copy of the GNU Affero Public License
                     24:  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
                     25:  *
1.3     ! snw        26:  *   $Log$
        !            27:  *
        !            28:  * SPDX-FileCopyrightText:  (C) 2025 Coherent Logic Development LLC
        !            29:  * SPDX-License-Identifier: AGPL-3.0-or-later
1.1       snw        30:  **/
                     31: 
                     32: #include <fcntl.h>
                     33: #include <unistd.h>
                     34: #include <errno.h>
                     35: #include "fs.h"
                     36: 
                     37: int cp(const char *to, const char *from)
                     38: {
                     39:     int fd_to, fd_from;
                     40:     char buf[4096];
                     41:     ssize_t nread;
                     42:     int saved_errno;
                     43: 
                     44:     fd_from = open(from, O_RDONLY);
                     45:     if (fd_from < 0)
                     46:         return -1;
                     47: 
                     48:     fd_to = open(to, O_WRONLY | O_CREAT | O_EXCL, 0666);
                     49:     if (fd_to < 0)
                     50:         goto out_error;
                     51: 
                     52:     while (nread = read(fd_from, buf, sizeof buf), nread > 0)
                     53:     {
                     54:         char *out_ptr = buf;
                     55:         ssize_t nwritten;
                     56: 
                     57:         do {
                     58:             nwritten = write(fd_to, out_ptr, nread);
                     59: 
                     60:             if (nwritten >= 0)
                     61:             {
                     62:                 nread -= nwritten;
                     63:                 out_ptr += nwritten;
                     64:             }
                     65:             else if (errno != EINTR)
                     66:             {
                     67:                 goto out_error;
                     68:             }
                     69:         } while (nread > 0);
                     70:     }
                     71: 
                     72:     if (nread == 0)
                     73:     {
                     74:         if (close(fd_to) < 0)
                     75:         {
                     76:             fd_to = -1;
                     77:             goto out_error;
                     78:         }
                     79:         close(fd_from);
                     80: 
                     81:         /* Success! */
                     82:         return 0;
                     83:     }
                     84: 
                     85:   out_error:
                     86:     saved_errno = errno;
                     87: 
                     88:     close(fd_from);
                     89:     if (fd_to >= 0)
                     90:         close(fd_to);
                     91: 
                     92:     errno = saved_errno;
                     93:     return -1;
                     94: }