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 n_is_dir(char const *name, bool_t check_access){
  44    struct stat sbuf;
  45    bool_t rv;
  46    NYD2_ENTER;
  47
  48    if((rv = (stat(name, &sbuf) == 0))){
  49       if((rv = (S_ISDIR(sbuf.st_mode) != 0)) && check_access)
  50          rv = (access(name, R_OK | W_OK | X_OK) == 0);
  51    }
  52    NYD2_LEAVE;
  53    return rv;
  54 }
  55
  56 FL bool_t
  57 n_path_mkdir(char const *name){
  58    struct stat st;
  59    bool_t rv;
  60    NYD_ENTER;
  61
  62 jredo:
  63    if(!mkdir(name, 0777))
  64       rv = TRU1;
  65    else{
  66       int e = n_err_no;
  67
  68       /* Try it recursively */
  69       if(e == n_ERR_NOENT){
  70          char const *vp;
  71
  72          if((vp = strrchr(name, '/')) != NULL){ /* TODO magic dirsep */
  73             while(vp > name && vp[-1] == '/')
  74                --vp;
  75             vp = savestrbuf(name, PTR2SIZE(vp - name));
  76
  77             if(n_path_mkdir(vp))
  78                goto jredo;
  79          }
  80       }
  81
  82       rv = ((e == n_ERR_EXIST || e == n_ERR_NOSYS) && !stat(name, &st) &&
  83             S_ISDIR(st.st_mode));
  84    }
  85    NYD_LEAVE;
  86    return rv;
  87 }
  88
  89 FL bool_t
  90 n_path_rm(char const *name){
  91    struct stat sb;
  92    bool_t rv;
  93    NYD2_ENTER;
  94
  95    if(stat(name, &sb) != 0)
  96       rv = FAL0;
  97    else if(!S_ISREG(sb.st_mode))
  98       rv = TRUM1;
  99    else
 100       rv = (unlink(name) == 0);
 101    NYD2_LEAVE;
 102    return rv;
 103 }
 104
 105 #ifdef HAVE_FCHDIR
 106 FL enum okay
 107 cwget(struct cw *cw)
 108 {
 109    enum okay rv = STOP;
 110    NYD_ENTER;
 111
 112    if ((cw->cw_fd = open(".", O_RDONLY)) == -1)
 113       goto jleave;
 114    if (fchdir(cw->cw_fd) == -1) {
 115       close(cw->cw_fd);
 116       goto jleave;
 117    }
 118    rv = OKAY;
 119 jleave:
 120    NYD_LEAVE;
 121    return rv;
 122 }
 123
 124 FL enum okay
 125 cwret(struct cw *cw)
 126 {
 127    enum okay rv = STOP;
 128    NYD_ENTER;
 129
 130    if (!fchdir(cw->cw_fd))
 131       rv = OKAY;
 132    NYD_LEAVE;
 133    return rv;
 134 }
 135
 136 FL void
 137 cwrelse(struct cw *cw)
 138 {
 139    NYD_ENTER;
 140    close(cw->cw_fd);
 141    NYD_LEAVE;
 142 }
 143
 144 #else /* !HAVE_FCHDIR */
 145 FL enum okay
 146 cwget(struct cw *cw)
 147 {
 148    enum okay rv = STOP;
 149    NYD_ENTER;
 150
 151    if (getcwd(cw->cw_wd, sizeof cw->cw_wd) != NULL && !chdir(cw->cw_wd))
 152       rv = OKAY;
 153    NYD_LEAVE;
 154    return rv;
 155 }
 156
 157 FL enum okay
 158 cwret(struct cw *cw)
 159 {
 160    enum okay rv = STOP;
 161    NYD_ENTER;
 162
 163    if (!chdir(cw->cw_wd))
 164       rv = OKAY;
 165    NYD_LEAVE;
 166    return rv;
 167 }
 168
 169 FL void
 170 cwrelse(struct cw *cw)
 171 {
 172    NYD_ENTER;
 173    n_UNUSED(cw);
 174    NYD_LEAVE;
 175 }
 176 #endif /* !HAVE_FCHDIR */
 177
 178 /* s-it-mode */