SDL

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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#if defined(SDL_FSOPS_POSIX)
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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// System dependent filesystem routines
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#include "../SDL_sysfilesystem.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <sys/stat.h>
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int SDL_SYS_EnumerateDirectory(const char *path, const char *dirname, SDL_EnumerateDirectoryCallback cb, void *userdata)
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{
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    int result = 1;
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    DIR *dir = opendir(path);
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    if (!dir) {
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        SDL_SetError("Can't open directory: %s", strerror(errno));
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        return -1;
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    }
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    struct dirent *ent;
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    while ((result == 1) && ((ent = readdir(dir)) != NULL))
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    {
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        const char *name = ent->d_name;
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        if ((SDL_strcmp(name, ".") == 0) || (SDL_strcmp(name, "..") == 0)) {
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            continue;
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        }
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        result = cb(userdata, dirname, name);
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    }
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    closedir(dir);
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    return result;
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}
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bool SDL_SYS_RemovePath(const char *path)
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{
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    int rc = remove(path);
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    if (rc < 0) {
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        if (errno == ENOENT) {
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            // It's already gone, this is a success
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            return true;
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        }
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        return SDL_SetError("Can't remove path: %s", strerror(errno));
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    }
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    return true;
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}
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bool SDL_SYS_RenamePath(const char *oldpath, const char *newpath)
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{
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    if (rename(oldpath, newpath) < 0) {
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        return SDL_SetError("Can't remove path: %s", strerror(errno));
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    }
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    return true;
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}
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bool SDL_SYS_CopyFile(const char *oldpath, const char *newpath)
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{
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    char *buffer = NULL;
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    char *tmppath = NULL;
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    SDL_IOStream *input = NULL;
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    SDL_IOStream *output = NULL;
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    const size_t maxlen = 4096;
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    size_t len;
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    bool result = false;
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    if (SDL_asprintf(&tmppath, "%s.tmp", newpath) < 0) {
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        goto done;
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    }
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    input = SDL_IOFromFile(oldpath, "rb");
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    if (!input) {
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        goto done;
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    }
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    output = SDL_IOFromFile(tmppath, "wb");
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    if (!output) {
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        goto done;
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    }
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    buffer = (char *)SDL_malloc(maxlen);
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    if (!buffer) {
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        goto done;
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    }
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    while ((len = SDL_ReadIO(input, buffer, maxlen)) > 0) {
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        if (SDL_WriteIO(output, buffer, len) < len) {
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            goto done;
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        }
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    }
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    if (SDL_GetIOStatus(input) != SDL_IO_STATUS_EOF) {
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        goto done;
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    }
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    SDL_CloseIO(input);
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    input = NULL;
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    if (!SDL_CloseIO(output)) {
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        goto done;
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    }
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    output = NULL;
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    if (!SDL_RenamePath(tmppath, newpath)) {
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        SDL_RemovePath(tmppath);
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        goto done;
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    }
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    result = true;
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done:
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    if (output) {
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        SDL_CloseIO(output);
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        SDL_RemovePath(tmppath);
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    }
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    if (input) {
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        SDL_CloseIO(input);
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    }
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    SDL_free(tmppath);
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    SDL_free(buffer);
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    return result;
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}
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bool SDL_SYS_CreateDirectory(const char *path)
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{
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    const int rc = mkdir(path, 0770);
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    if (rc < 0) {
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        const int origerrno = errno;
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        if (origerrno == EEXIST) {
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            struct stat statbuf;
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            if ((stat(path, &statbuf) == 0) && (S_ISDIR(statbuf.st_mode))) {
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                return true;  // it already exists and it's a directory, consider it success.
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            }
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        }
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        return SDL_SetError("Can't create directory: %s", strerror(origerrno));
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    }
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    return true;
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}
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bool SDL_SYS_GetPathInfo(const char *path, SDL_PathInfo *info)
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{
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    struct stat statbuf;
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    const int rc = stat(path, &statbuf);
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    if (rc < 0) {
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        return SDL_SetError("Can't stat: %s", strerror(errno));
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    } else if (S_ISREG(statbuf.st_mode)) {
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        info->type = SDL_PATHTYPE_FILE;
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        info->size = (Uint64) statbuf.st_size;
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    } else if (S_ISDIR(statbuf.st_mode)) {
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        info->type = SDL_PATHTYPE_DIRECTORY;
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        info->size = 0;
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    } else {
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        info->type = SDL_PATHTYPE_OTHER;
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        info->size = (Uint64) statbuf.st_size;
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    }
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#if defined(HAVE_ST_MTIM)
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    // POSIX.1-2008 standard
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    info->create_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_ctim.tv_sec) + statbuf.st_ctim.tv_nsec;
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    info->modify_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_mtim.tv_sec) + statbuf.st_mtim.tv_nsec;
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    info->access_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_atim.tv_sec) + statbuf.st_atim.tv_nsec;
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#elif defined(SDL_PLATFORM_APPLE)
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    /* Apple platform stat structs use 'st_*timespec' naming. */
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    info->create_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_ctimespec.tv_sec) + statbuf.st_ctimespec.tv_nsec;
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    info->modify_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_mtimespec.tv_sec) + statbuf.st_mtimespec.tv_nsec;
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    info->access_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_atimespec.tv_sec) + statbuf.st_atimespec.tv_nsec;
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#else
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    info->create_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_ctime);
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    info->modify_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_mtime);
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    info->access_time = (SDL_Time)SDL_SECONDS_TO_NS(statbuf.st_atime);
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#endif
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    return true;
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}
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#endif // SDL_FSOPS_POSIX
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