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 - 2017 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   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 jredo:
  67    if(!mkdir(name, 0777))
  68       rv = TRU1;
  69    else{
  70       int e = errno;
  71
  72       /* Try it recursively */
  73       if(e == ENOENT){
  74          char const *vp;
  75
  76
  77          if((vp = strrchr(name, '/')) != NULL){ /* TODO magic dirsep */
  78             while(vp > name && vp[-1] == '/')
  79                --vp;
  80             vp = savestrbuf(name, PTR2SIZE(vp - name));
  81
  82             if(n_path_mkdir(vp))
  83                goto jredo;
  84          }
  85       }
  86
  87       rv = ((e == EEXIST || e == ENOSYS) && !stat(name, &st) &&
  88             S_ISDIR(st.st_mode));
  89    }
  90    NYD_LEAVE;
  91    return rv;
  92 }
  93
  94 FL bool_t
  95 n_path_rm(char const *name)
  96 {
  97    struct stat sb;
  98    bool_t rv;
  99    NYD_ENTER;
 100
 101    if (stat(name, &sb) != 0)
 102       rv = FAL0;
 103    else if (!S_ISREG(sb.st_mode))
 104       rv = TRUM1;
 105    else
 106       rv = (unlink(name) == 0);
 107    NYD_LEAVE;
 108    return rv;
 109 }
 110
 111 #ifdef HAVE_FCHDIR
 112 FL enum okay
 113 cwget(struct cw *cw)
 114 {
 115    enum okay rv = STOP;
 116    NYD_ENTER;
 117
 118    if ((cw->cw_fd = open(".", O_RDONLY)) == -1)
 119       goto jleave;
 120    if (fchdir(cw->cw_fd) == -1) {
 121       close(cw->cw_fd);
 122       goto jleave;
 123    }
 124    rv = OKAY;
 125 jleave:
 126    NYD_LEAVE;
 127    return rv;
 128 }
 129
 130 FL enum okay
 131 cwret(struct cw *cw)
 132 {
 133    enum okay rv = STOP;
 134    NYD_ENTER;
 135
 136    if (!fchdir(cw->cw_fd))
 137       rv = OKAY;
 138    NYD_LEAVE;
 139    return rv;
 140 }
 141
 142 FL void
 143 cwrelse(struct cw *cw)
 144 {
 145    NYD_ENTER;
 146    close(cw->cw_fd);
 147    NYD_LEAVE;
 148 }
 149
 150 #else /* !HAVE_FCHDIR */
 151 FL enum okay
 152 cwget(struct cw *cw)
 153 {
 154    enum okay rv = STOP;
 155    NYD_ENTER;
 156
 157    if (getcwd(cw->cw_wd, sizeof cw->cw_wd) != NULL && !chdir(cw->cw_wd))
 158       rv = OKAY;
 159    NYD_LEAVE;
 160    return rv;
 161 }
 162
 163 FL enum okay
 164 cwret(struct cw *cw)
 165 {
 166    enum okay rv = STOP;
 167    NYD_ENTER;
 168
 169    if (!chdir(cw->cw_wd))
 170       rv = OKAY;
 171    NYD_LEAVE;
 172    return rv;
 173 }
 174
 175 FL void
 176 cwrelse(struct cw *cw)
 177 {
 178    NYD_ENTER;
 179    n_UNUSED(cw);
 180    NYD_LEAVE;
 181 }
 182 #endif /* !HAVE_FCHDIR */
 183
 184 /* s-it-mode */