ESP-IDF
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Outline
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include "esp_check.h"
#include "esp_log.h"
TAG
alphasort(const struct dirent **, const struct dirent **)
scandir(const char *, struct dirent ***, int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **))
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/newlib/scandir.c
 
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/* * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <stdlib.h> #include <string.h> #include <dirent.h> #include "esp_check.h" #include "esp_log.h"5 includes static const char *TAG = "scandir"; int alphasort(const struct dirent **lhs, const struct dirent **rhs) { return strcoll((*lhs)->d_name, (*rhs)->d_name); }{ ... } int scandir(const char *dirname, struct dirent ***out_dirlist, int (*select_func)(const struct dirent *), int (*cmp_func)(const struct dirent **, const struct dirent **)) { DIR *dir_ptr = NULL; struct dirent *entry; size_t num_entries = 0; size_t array_size = 8; /* initial estimate */ struct dirent **entries = NULL; int ret = -1; entries = malloc(array_size * sizeof(struct dirent *)); ESP_RETURN_ON_FALSE(entries, -1, TAG, "Malloc failed for entries"); dir_ptr = opendir(dirname); ESP_GOTO_ON_FALSE(dir_ptr, -1, out, TAG, "Failed to open directory: %s", dirname); ESP_COMPILER_DIAGNOSTIC_PUSH_IGNORE("-Wanalyzer-malloc-leak") // Ignore intended return of allocated *out_dirlist while ((entry = readdir(dir_ptr)) != NULL) { /* skip entries that don't match the filter function */ if (select_func != NULL && !select_func(entry)) { continue; }{...} struct dirent *entry_copy = malloc(sizeof(struct dirent)); ESP_GOTO_ON_FALSE(entry_copy, -1, out, TAG, "Malloc failed for entry_copy"); *entry_copy = *entry; entries[num_entries++] = entry_copy; /* grow the array size if it's full */ if (num_entries >= array_size) { array_size *= 2; struct dirent **new_entries = realloc(entries, array_size * sizeof(struct dirent *)); ESP_GOTO_ON_FALSE(new_entries, -1, out, TAG, "Realloc failed for entries"); entries = new_entries; }{...} }{...} /* sort the entries if a comparison function is provided */ if (num_entries && cmp_func) { qsort(entries, num_entries, sizeof(struct dirent *), (int (*)(const void *, const void *))cmp_func); }{...} *out_dirlist = entries; ret = num_entries; out: if (ret < 0) { while (num_entries > 0) { free(entries[--num_entries]); }{...} free(entries); }{...} if (dir_ptr) { closedir(dir_ptr); }{...} return ret; ESP_COMPILER_DIAGNOSTIC_POP("-Wanalyzer-malloc-leak") }{ ... }
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