tools/power/acpi/os_specific/service_layers/osunixdir.c

   1 /******************************************************************************
   2  *
   3  * Module Name: osunixdir - Unix directory access interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * 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  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <dirent.h>
  50 #include <fnmatch.h>
  51 #include <ctype.h>
  52 #include <sys/stat.h>
  53
  54 /*
  55  * Allocated structure returned from os_open_directory
  56  */
  57 typedef struct external_find_info {
  58         char *dir_pathname;
  59         DIR *dir_ptr;
  60         char temp_buffer[256];
  61         char *wildcard_spec;
  62         char requested_file_type;
  63
  64 } external_find_info;
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_os_open_directory
  69  *
  70  * PARAMETERS:  dir_pathname        - Full pathname to the directory
  71  *              wildcard_spec       - string of the form "*.c", etc.
  72  *
  73  * RETURN:      A directory "handle" to be used in subsequent search operations.
  74  *              NULL returned on failure.
  75  *
  76  * DESCRIPTION: Open a directory in preparation for a wildcard search
  77  *
  78  ******************************************************************************/
  79
  80 void *acpi_os_open_directory(char *dir_pathname,
  81                              char *wildcard_spec, char requested_file_type)
  82 {
  83         struct external_find_info *external_info;
  84         DIR *dir;
  85
  86         /* Allocate the info struct that will be returned to the caller */
  87
  88         external_info = calloc(1, sizeof(struct external_find_info));
  89         if (!external_info) {
  90                 return (NULL);
  91         }
  92
  93         /* Get the directory stream */
  94
  95         dir = opendir(dir_pathname);
  96         if (!dir) {
  97                 fprintf(stderr, "Cannot open directory - %s\n", dir_pathname);
  98                 free(external_info);
  99                 return (NULL);
 100         }
 101
 102         /* Save the info in the return structure */
 103
 104         external_info->wildcard_spec = wildcard_spec;
 105         external_info->requested_file_type = requested_file_type;
 106         external_info->dir_pathname = dir_pathname;
 107         external_info->dir_ptr = dir;
 108         return (external_info);
 109 }
 110
 111 /*******************************************************************************
 112  *
 113  * FUNCTION:    acpi_os_get_next_filename
 114  *
 115  * PARAMETERS:  dir_handle          - Created via acpi_os_open_directory
 116  *
 117  * RETURN:      Next filename matched. NULL if no more matches.
 118  *
 119  * DESCRIPTION: Get the next file in the directory that matches the wildcard
 120  *              specification.
 121  *
 122  ******************************************************************************/
 123
 124 char *acpi_os_get_next_filename(void *dir_handle)
 125 {
 126         struct external_find_info *external_info = dir_handle;
 127         struct dirent *dir_entry;
 128         char *temp_str;
 129         int str_len;
 130         struct stat temp_stat;
 131         int err;
 132
 133         while ((dir_entry = readdir(external_info->dir_ptr))) {
 134                 if (!fnmatch
 135                     (external_info->wildcard_spec, dir_entry->d_name, 0)) {
 136                         if (dir_entry->d_name[0] == '.') {
 137                                 continue;
 138                         }
 139
 140                         str_len = strlen(dir_entry->d_name) +
 141                             strlen(external_info->dir_pathname) + 2;
 142
 143                         temp_str = calloc(str_len, 1);
 144                         if (!temp_str) {
 145                                 fprintf(stderr,
 146                                         "Could not allocate buffer for temporary string\n");
 147                                 return (NULL);
 148                         }
 149
 150                         strcpy(temp_str, external_info->dir_pathname);
 151                         strcat(temp_str, "/");
 152                         strcat(temp_str, dir_entry->d_name);
 153
 154                         err = stat(temp_str, &temp_stat);
 155                         if (err == -1) {
 156                                 fprintf(stderr,
 157                                         "Cannot stat file (should not happen) - %s\n",
 158                                         temp_str);
 159                                 free(temp_str);
 160                                 return (NULL);
 161                         }
 162
 163                         free(temp_str);
 164
 165                         if ((S_ISDIR(temp_stat.st_mode)
 166                              && (external_info->requested_file_type ==
 167                                  REQUEST_DIR_ONLY))
 168                             || ((!S_ISDIR(temp_stat.st_mode)
 169                                  && external_info->requested_file_type ==
 170                                  REQUEST_FILE_ONLY))) {
 171
 172                                 /* copy to a temp buffer because dir_entry struct is on the stack */
 173
 174                                 strcpy(external_info->temp_buffer,
 175                                        dir_entry->d_name);
 176                                 return (external_info->temp_buffer);
 177                         }
 178                 }
 179         }
 180
 181         return (NULL);
 182 }
 183
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_os_close_directory
 187  *
 188  * PARAMETERS:  dir_handle          - Created via acpi_os_open_directory
 189  *
 190  * RETURN:      None.
 191  *
 192  * DESCRIPTION: Close the open directory and cleanup.
 193  *
 194  ******************************************************************************/
 195
 196 void acpi_os_close_directory(void *dir_handle)
 197 {
 198         struct external_find_info *external_info = dir_handle;
 199
 200         /* Close the directory and free allocations */
 201
 202         closedir(external_info->dir_ptr);
 203         free(dir_handle);
 204 }