path.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Path and directory related operations.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2015 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #undef n_FILE
  36 #define n_FILE path
  37
  38 #ifndef HAVE_AMALGAMATION
  39 # include "nail.h"
  40 #endif
  41
  42 FL bool_t
  43 is_dir(char const *name)
  44 {
  45    struct stat sbuf;
  46    bool_t rv;
  47    NYD_ENTER;
  48
  49    for (rv = FAL0;;)
  50       if (!stat(name, &sbuf)) {
  51          rv = (S_ISDIR(sbuf.st_mode) != 0);
  52          break;
  53       } else if (errno != EINTR)
  54          break;
  55    NYD_LEAVE;
  56    return rv;
  57 }
  58
  59 FL bool_t
  60 n_path_mkdir(char const *name)
  61 {
  62    struct stat st;
  63    bool_t rv;
  64    NYD_ENTER;
  65
  66    if (!mkdir(name, 0700))
  67       rv = TRU1;
  68    else {
  69       int e = errno;
  70
  71       rv = ((e == EEXIST || e == ENOSYS) && !stat(name, &st) &&
  72             S_ISDIR(st.st_mode));
  73    }
  74    NYD_LEAVE;
  75    return rv;
  76 }
  77
  78 FL bool_t
  79 n_path_rm(char const *name)
  80 {
  81    struct stat sb;
  82    bool_t rv;
  83    NYD_ENTER;
  84
  85    if (stat(name, &sb) != 0)
  86       rv = FAL0;
  87    else if (!S_ISREG(sb.st_mode))
  88       rv = TRUM1;
  89    else
  90       rv = (unlink(name) == 0);
  91    NYD_LEAVE;
  92    return rv;
  93 }
  94
  95 #ifdef HAVE_FCHDIR
  96 FL enum okay
  97 cwget(struct cw *cw)
  98 {
  99    enum okay rv = STOP;
 100    NYD_ENTER;
 101
 102    if ((cw->cw_fd = open(".", O_RDONLY)) == -1)
 103       goto jleave;
 104    if (fchdir(cw->cw_fd) == -1) {
 105       close(cw->cw_fd);
 106       goto jleave;
 107    }
 108    rv = OKAY;
 109 jleave:
 110    NYD_LEAVE;
 111    return rv;
 112 }
 113
 114 FL enum okay
 115 cwret(struct cw *cw)
 116 {
 117    enum okay rv = STOP;
 118    NYD_ENTER;
 119
 120    if (!fchdir(cw->cw_fd))
 121       rv = OKAY;
 122    NYD_LEAVE;
 123    return rv;
 124 }
 125
 126 FL void
 127 cwrelse(struct cw *cw)
 128 {
 129    NYD_ENTER;
 130    close(cw->cw_fd);
 131    NYD_LEAVE;
 132 }
 133
 134 #else /* !HAVE_FCHDIR */
 135 FL enum okay
 136 cwget(struct cw *cw)
 137 {
 138    enum okay rv = STOP;
 139    NYD_ENTER;
 140
 141    if (getcwd(cw->cw_wd, sizeof cw->cw_wd) != NULL && !chdir(cw->cw_wd))
 142       rv = OKAY;
 143    NYD_LEAVE;
 144    return rv;
 145 }
 146
 147 FL enum okay
 148 cwret(struct cw *cw)
 149 {
 150    enum okay rv = STOP;
 151    NYD_ENTER;
 152
 153    if (!chdir(cw->cw_wd))
 154       rv = OKAY;
 155    NYD_LEAVE;
 156    return rv;
 157 }
 158
 159 FL void
 160 cwrelse(struct cw *cw)
 161 {
 162    NYD_ENTER;
 163    UNUSED(cw);
 164    NYD_LEAVE;
 165 }
 166 #endif /* !HAVE_FCHDIR */
 167
 168 /* s-it-mode */