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244 lines
7.2 KiB
244 lines
7.2 KiB
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/bits/progn.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/dirent.h"
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#include "libc/dce.h"
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#include "libc/mem/mem.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filetype.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/win32finddata.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/dt.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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struct dirent$freebsd {
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uint32_t d_fileno;
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uint16_t d_reclen;
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uint8_t d_type;
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uint8_t d_namlen;
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char d_name[256];
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};
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struct dirstream {
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int64_t tell;
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int64_t fd;
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struct dirent ent;
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union {
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struct {
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unsigned buf_pos;
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unsigned buf_end;
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char buf[BUFSIZ];
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};
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struct {
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bool isdone;
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struct NtWin32FindData windata;
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};
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};
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};
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static textwindows noinline DIR *opendir$nt(const char *name) {
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int len;
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DIR *res;
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char16_t name16[PATH_MAX];
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if ((len = mkntpath(name, name16)) == -1) return NULL;
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if (len + 2 + 1 > PATH_MAX) return PROGN(enametoolong(), NULL);
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if (name16[len - 1] == u'/' || name16[len - 1] == u'\\') {
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name16[--len] = u'\0';
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}
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name16[len++] = u'/';
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name16[len++] = u'*';
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name16[len] = u'\0';
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if (!(res = calloc(1, sizeof(DIR)))) return NULL;
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if ((res->fd = FindFirstFile(name16, &res->windata)) != -1) {
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return res;
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} else {
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winerr();
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free(res);
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return NULL;
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}
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}
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static textwindows noinline struct dirent *readdir$nt(DIR *dir) {
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if (!dir->isdone) {
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memset(&dir->ent, 0, sizeof(dir->ent));
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dir->ent.d_ino = 0;
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dir->ent.d_off = dir->tell++;
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dir->ent.d_reclen = sizeof(dir->ent) +
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tprecode16to8(dir->ent.d_name, sizeof(dir->ent.d_name),
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dir->windata.cFileName) +
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1;
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switch (dir->windata.dwFileType) {
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case kNtFileTypeDisk:
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dir->ent.d_type = DT_BLK;
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break;
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case kNtFileTypeChar:
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dir->ent.d_type = DT_CHR;
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break;
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case kNtFileTypePipe:
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dir->ent.d_type = DT_FIFO;
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break;
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default:
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if (dir->windata.dwFileAttributes & kNtFileAttributeDirectory) {
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dir->ent.d_type = DT_DIR;
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} else {
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dir->ent.d_type = DT_REG;
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}
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break;
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}
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dir->isdone = !FindNextFile(dir->fd, &dir->windata);
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return &dir->ent;
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} else {
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return NULL;
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}
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}
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/**
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* Opens directory, e.g.
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*
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* DIR *d;
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* struct dirent *e;
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* CHECK((d = opendir(path)));
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* while ((e = readdir(d))) {
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* printf("%s/%s\n", path, e->d_name);
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* }
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* LOGIFNEG1(closedir(d));
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*
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* @returns newly allocated DIR object, or NULL w/ errno
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* @errors ENOENT, ENOTDIR, EACCES, EMFILE, ENFILE, ENOMEM
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* @see glob()
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*/
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DIR *opendir(const char *name) {
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int fd;
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DIR *res;
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if (!IsWindows() && !IsXnu()) {
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res = NULL;
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if ((fd = open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) != -1) {
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if (!(res = fdopendir(fd))) close(fd);
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}
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return res;
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} else if (IsWindows()) {
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return opendir$nt(name);
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} else {
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enosys(); /* TODO(jart): Implement me! */
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return NULL;
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}
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}
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/**
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* Creates directory object for file descriptor.
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*
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* @param fd gets owned by this function, if it succeeds
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* @return new directory object, which must be freed by closedir(),
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* or NULL w/ errno
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* @errors ENOMEM and fd is closed
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*/
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DIR *fdopendir(int fd) {
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DIR *dir;
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if (!IsWindows() && !IsXnu()) {
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if ((dir = calloc(1, sizeof(*dir)))) {
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dir->fd = fd;
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return dir;
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}
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} else {
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enosys(); /* TODO(jart): Implement me! */
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}
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return NULL;
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}
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/**
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* Reads next entry from DIR.
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*
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* This API doesn't define any particular ordering.
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*
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* @param dir is the object opendir() or fdopendir() returned
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* @return next entry or NULL on end or error, which can be
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* differentiated by setting errno to 0 beforehand
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*/
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struct dirent *readdir(DIR *dir) {
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int rc;
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struct dirent *ent;
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struct dirent$freebsd *freebsd;
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if (!IsWindows()) {
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if (dir->buf_pos >= dir->buf_end) {
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if (!(rc = getdents(dir->fd, dir->buf,
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sizeof(dir->buf) - sizeof(dir->ent.d_name))) ||
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rc == -1) {
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return NULL;
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}
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dir->buf_pos = 0;
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dir->buf_end = rc;
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}
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if (IsLinux()) {
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ent = (struct dirent *)(dir->buf + dir->buf_pos);
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dir->buf_pos += ent->d_reclen;
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dir->tell = ent->d_off;
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} else {
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freebsd = (struct dirent$freebsd *)(dir->buf + dir->buf_pos);
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dir->buf_pos += freebsd->d_reclen;
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ent = &dir->ent;
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ent->d_ino = freebsd->d_fileno;
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ent->d_off = dir->tell++;
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ent->d_reclen = freebsd->d_reclen;
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ent->d_type = freebsd->d_type;
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memcpy(ent->d_name, freebsd->d_name, freebsd->d_namlen + 1);
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}
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return ent;
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} else {
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return readdir$nt(dir);
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}
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}
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/**
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* Closes directory object returned by opendir().
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* @return 0 on success or -1 w/ errno
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*/
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int closedir(DIR *dir) {
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int rc;
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if (dir) {
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if (!IsWindows()) {
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rc = close(dir->fd);
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} else {
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rc = FindClose(dir->fd) ? 0 : winerr();
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}
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free(dir);
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} else {
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rc = 0;
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}
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return rc;
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}
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/**
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* Returns offset into directory data.
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*/
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long telldir(DIR *dir) {
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return dir->tell;
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}
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/**
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* Returns file descriptor associated with DIR object.
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*/
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int dirfd(DIR *dir) {
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return dir->fd;
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}
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