eglib/src/gfile-posix.c

   1 /*
   2  * File utility functions.
   3  *
   4  * Author:
   5  *   Gonzalo Paniagua Javier (gonzalo@novell.com)
   6  *
   7  * (C) 2006 Novell, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * a copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28 #include <config.h>
  29 #include <glib.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34 #include <sys/stat.h>
  35 #include <sys/types.h>
  36
  37 #ifdef _MSC_VER
  38 #include <direct.h>
  39 int mkstemp (char *tmp_template);
  40 #endif
  41
  42 #ifndef O_LARGEFILE
  43 #define OPEN_FLAGS (O_RDONLY)
  44 #else
  45 #define OPEN_FLAGS (O_RDONLY | O_LARGEFILE)
  46 #endif
  47 gboolean
  48 g_file_get_contents (const gchar *filename, gchar **contents, gsize *length, GError **error)
  49 {
  50         gchar *str;
  51         int fd;
  52         struct stat st;
  53         long offset;
  54         int nread;
  55
  56         g_return_val_if_fail (filename != NULL, FALSE);
  57         g_return_val_if_fail (contents != NULL, FALSE);
  58         g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
  59
  60         *contents = NULL;
  61         if (length)
  62                 *length = 0;
  63
  64         fd = open (filename, OPEN_FLAGS);
  65         if (fd == -1) {
  66                 if (error != NULL) {
  67                         int err = errno;
  68                         *error = g_error_new (G_LOG_DOMAIN, g_file_error_from_errno (err), "Error opening file");
  69                 }
  70                 return FALSE;
  71         }
  72
  73         if (fstat (fd, &st) != 0) {
  74                 if (error != NULL) {
  75                         int err = errno;
  76                         *error = g_error_new (G_LOG_DOMAIN, g_file_error_from_errno (err), "Error in fstat()");
  77                 }
  78                 close (fd);
  79                 return FALSE;
  80         }
  81
  82         str = g_malloc (st.st_size + 1);
  83         offset = 0;
  84         do {
  85                 nread = read (fd, str + offset, st.st_size - offset);
  86                 if (nread > 0) {
  87                         offset += nread;
  88                 }
  89         } while ((nread > 0 && offset < st.st_size) || (nread == -1 && errno == EINTR));
  90
  91         close (fd);
  92         str [st.st_size] = '\0';
  93         if (length) {
  94                 *length = st.st_size;
  95         }
  96         *contents = str;
  97         return TRUE;
  98 }
  99
 100 gint
 101 g_file_open_tmp (const gchar *tmpl, gchar **name_used, GError **error)
 102 {
 103         const static gchar *default_tmpl = ".XXXXXX";
 104         gchar *t;
 105         gint fd;
 106         size_t len;
 107
 108         g_return_val_if_fail (error == NULL || *error == NULL, -1);
 109
 110         if (tmpl == NULL)
 111                 tmpl = default_tmpl;
 112
 113         if (strchr (tmpl, G_DIR_SEPARATOR) != NULL) {
 114                 if (error) {
 115                         *error = g_error_new (G_LOG_DOMAIN, 24, "Template should not have any " G_DIR_SEPARATOR_S);
 116                 }
 117                 return -1;
 118         }
 119
 120         len = strlen (tmpl);
 121         if (len < 6 || strcmp (tmpl + len - 6, "XXXXXX")) {
 122                 if (error) {
 123                         *error = g_error_new (G_LOG_DOMAIN, 24, "Template should end with XXXXXX");
 124                 }
 125                 return -1;
 126         }
 127
 128         t = g_build_filename (g_get_tmp_dir (), tmpl, NULL);
 129
 130         fd = mkstemp (t);
 131
 132         if (fd == -1) {
 133                 if (error) {
 134                         int err = errno;
 135                         *error = g_error_new (G_LOG_DOMAIN, g_file_error_from_errno (err), "Error in mkstemp()");
 136                 }
 137                 g_free (t);
 138                 return -1;
 139         }
 140
 141         if (name_used) {
 142                 *name_used = t;
 143         } else {
 144                 g_free (t);
 145         }
 146         return fd;
 147 }
 148
 149 gchar *
 150 g_get_current_dir (void)
 151 {
 152         int s = 32;
 153         char *buffer = NULL, *r;
 154         gboolean fail;
 155
 156         do {
 157                 buffer = g_realloc (buffer, s);
 158                 r = getcwd (buffer, s);
 159                 fail = (r == NULL && errno == ERANGE);
 160                 if (fail) {
 161                         s <<= 1;
 162                 }
 163         } while (fail);
 164
 165         /* On amd64 sometimes the bottom 32-bits of r == the bottom 32-bits of buffer
 166          * but the top 32-bits of r have overflown to 0xffffffff (seriously wtf getcwd
 167          * so we return the buffer here since it has a pointer to the valid string
 168          */
 169         return buffer;
 170 }
 171