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First phase of REUSE compliance and header reformat

    1: /*
    2:  *   $Id: fs.c,v 1.3 2025/03/09 19:14:25 snw Exp $
    3:  *    filesystem support functions
    4:  *
    5:  *  
    6:  *   Author: Serena Willis <snw@coherent-logic.com>
    7:  *    Copyright (C) 1998 MUG Deutschland
    8:  *    Copyright (C) 2024, 2025 Coherent Logic Development LLC
    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:  *
   26:  *   $Log: fs.c,v $
   27:  *   Revision 1.3  2025/03/09 19:14:25  snw
   28:  *   First phase of REUSE compliance and header reformat
   29:  *
   30:  *
   31:  * SPDX-FileCopyrightText:  (C) 2025 Coherent Logic Development LLC
   32:  * SPDX-License-Identifier: AGPL-3.0-or-later
   33:  **/
   34: 
   35: #include <fcntl.h>
   36: #include <unistd.h>
   37: #include <errno.h>
   38: #include "fs.h"
   39: 
   40: int cp(const char *to, const char *from)
   41: {
   42:     int fd_to, fd_from;
   43:     char buf[4096];
   44:     ssize_t nread;
   45:     int saved_errno;
   46: 
   47:     fd_from = open(from, O_RDONLY);
   48:     if (fd_from < 0)
   49:         return -1;
   50: 
   51:     fd_to = open(to, O_WRONLY | O_CREAT | O_EXCL, 0666);
   52:     if (fd_to < 0)
   53:         goto out_error;
   54: 
   55:     while (nread = read(fd_from, buf, sizeof buf), nread > 0)
   56:     {
   57:         char *out_ptr = buf;
   58:         ssize_t nwritten;
   59: 
   60:         do {
   61:             nwritten = write(fd_to, out_ptr, nread);
   62: 
   63:             if (nwritten >= 0)
   64:             {
   65:                 nread -= nwritten;
   66:                 out_ptr += nwritten;
   67:             }
   68:             else if (errno != EINTR)
   69:             {
   70:                 goto out_error;
   71:             }
   72:         } while (nread > 0);
   73:     }
   74: 
   75:     if (nread == 0)
   76:     {
   77:         if (close(fd_to) < 0)
   78:         {
   79:             fd_to = -1;
   80:             goto out_error;
   81:         }
   82:         close(fd_from);
   83: 
   84:         /* Success! */
   85:         return 0;
   86:     }
   87: 
   88:   out_error:
   89:     saved_errno = errno;
   90: 
   91:     close(fd_from);
   92:     if (fd_to >= 0)
   93:         close(fd_to);
   94: 
   95:     errno = saved_errno;
   96:     return -1;
   97: }