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 - 2018 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   6  * SPDX-License-Identifier: BSD-3-Clause TODO ISC
   7  */
   8 /*
   9  * Copyright (c) 1980, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36 #undef n_FILE
  37 #define n_FILE path
  38
  39 #ifndef HAVE_AMALGAMATION
  40 # include "nail.h"
  41 #endif
  42
  43 FL bool_t
  44 n_is_dir(char const *name, bool_t check_access){
  45    struct stat sbuf;
  46    bool_t rv;
  47    NYD2_ENTER;
  48
  49    if((rv = (stat(name, &sbuf) == 0))){
  50       if((rv = (S_ISDIR(sbuf.st_mode) != 0)) && check_access){
  51          int mode;
  52
  53          mode = R_OK | X_OK;
  54          if(check_access != TRUM1)
  55             mode |= W_OK;
  56          rv = (access(name, mode) == 0);
  57       }
  58    }
  59    NYD2_LEAVE;
  60    return rv;
  61 }
  62
  63 FL bool_t
  64 n_path_mkdir(char const *name){
  65    struct stat st;
  66    bool_t rv;
  67    NYD_ENTER;
  68
  69 jredo:
  70    if(!mkdir(name, 0777))
  71       rv = TRU1;
  72    else{
  73       int e = n_err_no;
  74
  75       /* Try it recursively */
  76       if(e == n_ERR_NOENT){
  77          char const *vp;
  78
  79          if((vp = strrchr(name, '/')) != NULL){ /* TODO magic dirsep */
  80             while(vp > name && vp[-1] == '/')
  81                --vp;
  82             vp = savestrbuf(name, PTR2SIZE(vp - name));
  83
  84             if(n_path_mkdir(vp))
  85                goto jredo;
  86          }
  87       }
  88
  89       rv = ((e == n_ERR_EXIST || e == n_ERR_NOSYS) && !stat(name, &st) &&
  90             S_ISDIR(st.st_mode));
  91    }
  92    NYD_LEAVE;
  93    return rv;
  94 }
  95
  96 FL bool_t
  97 n_path_rm(char const *name){
  98    struct stat sb;
  99    bool_t rv;
 100    NYD2_ENTER;
 101
 102    if(stat(name, &sb) != 0)
 103       rv = FAL0;
 104    else if(!S_ISREG(sb.st_mode))
 105       rv = TRUM1;
 106    else
 107       rv = (unlink(name) == 0);
 108    NYD2_LEAVE;
 109    return rv;
 110 }
 111
 112 #ifdef HAVE_FCHDIR
 113 FL enum okay
 114 cwget(struct cw *cw)
 115 {
 116    enum okay rv = STOP;
 117    NYD_ENTER;
 118
 119    if ((cw->cw_fd = open(".", O_RDONLY)) == -1)
 120       goto jleave;
 121    if (fchdir(cw->cw_fd) == -1) {
 122       close(cw->cw_fd);
 123       goto jleave;
 124    }
 125    rv = OKAY;
 126 jleave:
 127    NYD_LEAVE;
 128    return rv;
 129 }
 130
 131 FL enum okay
 132 cwret(struct cw *cw)
 133 {
 134    enum okay rv = STOP;
 135    NYD_ENTER;
 136
 137    if (!fchdir(cw->cw_fd))
 138       rv = OKAY;
 139    NYD_LEAVE;
 140    return rv;
 141 }
 142
 143 FL void
 144 cwrelse(struct cw *cw)
 145 {
 146    NYD_ENTER;
 147    close(cw->cw_fd);
 148    NYD_LEAVE;
 149 }
 150
 151 #else /* !HAVE_FCHDIR */
 152 FL enum okay
 153 cwget(struct cw *cw)
 154 {
 155    enum okay rv = STOP;
 156    NYD_ENTER;
 157
 158    if (getcwd(cw->cw_wd, sizeof cw->cw_wd) != NULL && !chdir(cw->cw_wd))
 159       rv = OKAY;
 160    NYD_LEAVE;
 161    return rv;
 162 }
 163
 164 FL enum okay
 165 cwret(struct cw *cw)
 166 {
 167    enum okay rv = STOP;
 168    NYD_ENTER;
 169
 170    if (!chdir(cw->cw_wd))
 171       rv = OKAY;
 172    NYD_LEAVE;
 173    return rv;
 174 }
 175
 176 FL void
 177 cwrelse(struct cw *cw)
 178 {
 179    NYD_ENTER;
 180    n_UNUSED(cw);
 181    NYD_LEAVE;
 182 }
 183 #endif /* !HAVE_FCHDIR */
 184
 185 /* s-it-mode */