LXR linux/tools/power/acpi/os_specific/service

   1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2/******************************************************************************
   3 *
   4 * Module Name: osunixdir - Unix directory access interfaces
   5 *
   6 * Copyright (C) 2000 - 2020, Intel Corp.
   7 *
   8 *****************************************************************************/
   9
  10#include <acpi/acpi.h>
  11
  12#include <stdio.h>
  13#include <stdlib.h>
  14#include <string.h>
  15#include <dirent.h>
  16#include <fnmatch.h>
  17#include <ctype.h>
  18#include <sys/stat.h>
  19
  20/*
  21 * Allocated structure returned from os_open_directory
  22 */
  23typedef struct external_find_info {
  24        char *dir_pathname;
  25        DIR *dir_ptr;
  26        char temp_buffer[256];
  27        char *wildcard_spec;
  28        char requested_file_type;
  29
  30} external_find_info;
  31
  32/*******************************************************************************
  33 *
  34 * FUNCTION:    acpi_os_open_directory
  35 *
  36 * PARAMETERS:  dir_pathname        - Full pathname to the directory
  37 *              wildcard_spec       - string of the form "*.c", etc.
  38 *
  39 * RETURN:      A directory "handle" to be used in subsequent search operations.
  40 *              NULL returned on failure.
  41 *
  42 * DESCRIPTION: Open a directory in preparation for a wildcard search
  43 *
  44 ******************************************************************************/
  45
  46void *acpi_os_open_directory(char *dir_pathname,
  47                             char *wildcard_spec, char requested_file_type)
  48{
  49        struct external_find_info *external_info;
  50        DIR *dir;
  51
  52        /* Allocate the info struct that will be returned to the caller */
  53
  54        external_info = calloc(1, sizeof(struct external_find_info));
  55        if (!external_info) {
  56                return (NULL);
  57        }
  58
  59        /* Get the directory stream */
  60
  61        dir = opendir(dir_pathname);
  62        if (!dir) {
  63                fprintf(stderr, "Cannot open directory - %s\n", dir_pathname);
  64                free(external_info);
  65                return (NULL);
  66        }
  67
  68        /* Save the info in the return structure */
  69
  70        external_info->wildcard_spec = wildcard_spec;
  71        external_info->requested_file_type = requested_file_type;
  72        external_info->dir_pathname = dir_pathname;
  73        external_info->dir_ptr = dir;
  74        return (external_info);
  75}
  76
  77/*******************************************************************************
  78 *
  79 * FUNCTION:    acpi_os_get_next_filename
  80 *
  81 * PARAMETERS:  dir_handle          - Created via acpi_os_open_directory
  82 *
  83 * RETURN:      Next filename matched. NULL if no more matches.
  84 *
  85 * DESCRIPTION: Get the next file in the directory that matches the wildcard
  86 *              specification.
  87 *
  88 ******************************************************************************/
  89
  90char *acpi_os_get_next_filename(void *dir_handle)
  91{
  92        struct external_find_info *external_info = dir_handle;
  93        struct dirent *dir_entry;
  94        char *temp_str;
  95        int str_len;
  96        struct stat temp_stat;
  97        int err;
  98
  99        while ((dir_entry = readdir(external_info->dir_ptr))) {
 100                if (!fnmatch
 101                    (external_info->wildcard_spec, dir_entry->d_name, 0)) {
 102                        if (dir_entry->d_name[0] == '.') {
 103                                continue;
 104                        }
 105
 106                        str_len = strlen(dir_entry->d_name) +
 107                            strlen(external_info->dir_pathname) + 2;
 108
 109                        temp_str = calloc(str_len, 1);
 110                        if (!temp_str) {
 111                                fprintf(stderr,
 112                                        "Could not allocate buffer for temporary string\n");
 113                                return (NULL);
 114                        }
 115
 116                        strcpy(temp_str, external_info->dir_pathname);
 117                        strcat(temp_str, "/");
 118                        strcat(temp_str, dir_entry->d_name);
 119
 120                        err = stat(temp_str, &temp_stat);
 121                        if (err == -1) {
 122                                fprintf(stderr,
 123                                        "Cannot stat file (should not happen) - %s\n",
 124                                        temp_str);
 125                                free(temp_str);
 126                                return (NULL);
 127                        }
 128
 129                        free(temp_str);
 130
 131                        if ((S_ISDIR(temp_stat.st_mode)
 132                             && (external_info->requested_file_type ==
 133                                 REQUEST_DIR_ONLY))
 134                            || ((!S_ISDIR(temp_stat.st_mode)
 135                                 && external_info->requested_file_type ==
 136                                 REQUEST_FILE_ONLY))) {
 137
 138                                /* copy to a temp buffer because dir_entry struct is on the stack */
 139
 140                                strcpy(external_info->temp_buffer,
 141                                       dir_entry->d_name);
 142                                return (external_info->temp_buffer);
 143                        }
 144                }
 145        }
 146
 147        return (NULL);
 148}
 149
 150/*******************************************************************************
 151 *
 152 * FUNCTION:    acpi_os_close_directory
 153 *
 154 * PARAMETERS:  dir_handle          - Created via acpi_os_open_directory
 155 *
 156 * RETURN:      None.
 157 *
 158 * DESCRIPTION: Close the open directory and cleanup.
 159 *
 160 ******************************************************************************/
 161
 162void acpi_os_close_directory(void *dir_handle)
 163{
 164        struct external_find_info *external_info = dir_handle;
 165
 166        /* Close the directory and free allocations */
 167
 168        closedir(external_info->dir_ptr);
 169        free(dir_handle);
 170}
 171