lib/libfetch/file.c

   1 /*-
   2  * Copyright (c) 1998-2011 Dag-Erling Smørgrav
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: head/lib/libfetch/file.c 240495 2012-09-14 12:15:13Z eadler $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/stat.h>
  33
  34 #include <dirent.h>
  35 #include <fcntl.h>
  36 #include <stdio.h>
  37 #include <string.h>
  38
  39 #include "fetch.h"
  40 #include "common.h"
  41
  42 FILE *
  43 fetchXGetFile(struct url *u, struct url_stat *us, const char *flags)
  44 {
  45         FILE *f;
  46
  47         if (us && fetchStatFile(u, us, flags) == -1)
  48                 return (NULL);
  49
  50         f = fopen(u->doc, "r");
  51
  52         if (f == NULL) {
  53                 fetch_syserr();
  54                 return (NULL);
  55         }
  56
  57         if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
  58                 fclose(f);
  59                 fetch_syserr();
  60                 return (NULL);
  61         }
  62
  63         fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
  64         return (f);
  65 }
  66
  67 FILE *
  68 fetchGetFile(struct url *u, const char *flags)
  69 {
  70         return (fetchXGetFile(u, NULL, flags));
  71 }
  72
  73 FILE *
  74 fetchPutFile(struct url *u, const char *flags)
  75 {
  76         FILE *f;
  77
  78         if (CHECK_FLAG('a'))
  79                 f = fopen(u->doc, "a");
  80         else
  81                 f = fopen(u->doc, "w+");
  82
  83         if (f == NULL) {
  84                 fetch_syserr();
  85                 return (NULL);
  86         }
  87
  88         if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
  89                 fclose(f);
  90                 fetch_syserr();
  91                 return (NULL);
  92         }
  93
  94         fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
  95         return (f);
  96 }
  97
  98 static int
  99 fetch_stat_file(const char *fn, struct url_stat *us)
 100 {
 101         struct stat sb;
 102
 103         us->size = -1;
 104         us->atime = us->mtime = 0;
 105         if (stat(fn, &sb) == -1) {
 106                 fetch_syserr();
 107                 return (-1);
 108         }
 109         us->size = sb.st_size;
 110         us->atime = sb.st_atime;
 111         us->mtime = sb.st_mtime;
 112         return (0);
 113 }
 114
 115 int
 116 fetchStatFile(struct url *u, struct url_stat *us, const char *flags __unused)
 117 {
 118         return (fetch_stat_file(u->doc, us));
 119 }
 120
 121 struct url_ent *
 122 fetchListFile(struct url *u, const char *flags __unused)
 123 {
 124         struct dirent *de;
 125         struct url_stat us;
 126         struct url_ent *ue;
 127         int size, len;
 128         char fn[PATH_MAX], *p;
 129         DIR *dir;
 130         int l;
 131
 132         if ((dir = opendir(u->doc)) == NULL) {
 133                 fetch_syserr();
 134                 return (NULL);
 135         }
 136
 137         ue = NULL;
 138         strncpy(fn, u->doc, sizeof(fn) - 2);
 139         fn[sizeof(fn) - 2] = 0;
 140         strcat(fn, "/");
 141         p = strchr(fn, 0);
 142         l = sizeof(fn) - strlen(fn) - 1;
 143
 144         while ((de = readdir(dir)) != NULL) {
 145                 strncpy(p, de->d_name, l - 1);
 146                 p[l - 1] = 0;
 147                 if (fetch_stat_file(fn, &us) == -1)
 148                         /* should I return a partial result, or abort? */
 149                         break;
 150                 fetch_add_entry(&ue, &size, &len, de->d_name, &us);
 151         }
 152
 153         return (ue);
 154 }