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removed recursion in file copying

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hyung-hwan
2014-12-18 15:05:52 +00:00
parent 206065f904
commit 0fdcaf547f
2 changed files with 113 additions and 26 deletions
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136
qse/lib/cmn/fs-copy.c
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@ -29,6 +29,8 @@
#include <qse/cmn/str.h>
#include "mem.h"
#define NO_RECURSION 1
/* internal flags. it must not overlap with qse_fs_cpfile_flag_t enumerators */
#define CPFILE_DST_ATTR (1 << 29)
#define CPFILE_DST_FSPATH_MERGED (1 << 30)
@ -309,18 +311,68 @@ static void clear_cpfile (qse_fs_t* fs, cpfile_t* cpfile)
}
}
/* copy file stack - stack for file copying */
typedef struct cfs_t cfs_t;
struct cfs_t
{
cpfile_t cpfile;
qse_dir_t* dir;
cfs_t* next;
};
static cfs_t* push_cfs (qse_fs_t* fs, const cpfile_t* cpfile, qse_dir_t* dir)
{
cfs_t* cfs;
cfs = (cfs_t*)QSE_MMGR_ALLOC (fs->mmgr, QSE_SIZEOF(*cfs));
if (cfs == QSE_NULL)
{
fs->errnum = QSE_FS_ENOMEM;
return QSE_NULL;
}
cfs->cpfile = *cpfile;
cfs->dir = dir;
cfs->next = fs->cfs;
fs->cfs = cfs;
return cfs;
}
static void pop_cfs (qse_fs_t* fs, cpfile_t* cpfile, qse_dir_t** dir)
{
cfs_t* cfs;
cfs = fs->cfs;
QSE_ASSERT (cfs != QSE_NULL);
fs->cfs = cfs->next;
if (cpfile) *cpfile = cfs->cpfile;
else clear_cpfile (fs, &cfs->cpfile);
if (dir) *dir = cfs->dir;
else qse_dir_close (cfs->dir);
QSE_MMGR_FREE (fs->mmgr, cfs);
}
static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
{
#if defined(NO_RECURSION)
cfs_t* cfs;
#else
cpfile_t sub_cpfile;
#endif
qse_dir_t* dir;
qse_dir_errnum_t direrr;
qse_dir_ent_t dirent;
int x;
start_over:
if (cpfile->src_attr.isdir)
{
/* source is a directory */
qse_dir_t* dir;
qse_dir_errnum_t direrr;
qse_dir_ent_t dirent;
cpfile_t sub_cpfile;
int x;
copy_dir:
if (cpfile->flags & CPFILE_DST_ATTR)
{
@ -328,7 +380,7 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
{
/* cannot copy a directory to a file */
fs->errnum = QSE_FS_ENOTDIR;
return -1;
goto oops;
}
if (!(cpfile->flags & QSE_FS_CPFILE_NOTGTDIR) &&
@ -339,7 +391,7 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
/* merge_dstdir_and_file() has been called already.
* no more getting into a subdirectory */
fs->errnum = QSE_FS_EISDIR;
return -1;
goto oops;
}
else
{
@ -361,7 +413,7 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
{
/* cannot copy a directory without recursion */
fs->errnum = QSE_FS_EISDIR;
return -1;
goto oops;
}
dir = qse_dir_open (
@ -376,14 +428,10 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
if (!dir)
{
fs->errnum = qse_fs_direrrtoerrnum (fs, direrr);
return -1;
goto oops;
}
if (qse_fs_sysmkdir (fs, cpfile->dst_fspath) <= -1)
{
qse_dir_close (dir);
return -1;
}
if (qse_fs_sysmkdir (fs, cpfile->dst_fspath) <= -1) goto oops;
while (1)
{
@ -391,11 +439,33 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
if (x <= -1)
{
fs->errnum = qse_fs_direrrtoerrnum (fs, qse_dir_geterrnum(dir));
qse_dir_close (dir);
return -1;
goto oops;
}
if (x == 0) break; /* no more entries */
#if defined(NO_RECURSION)
cfs = push_cfs (fs, cpfile, dir);
if (!cfs) goto oops;
QSE_MEMSET (cpfile, 0, QSE_SIZEOF(*cpfile));
dir = QSE_NULL;
cpfile->flags = cfs->cpfile.flags & QSE_FS_CPFILE_ALL; /* inherit public flags */
cpfile->src_fspath = merge_fspath_dup (cfs->cpfile.src_fspath, (qse_fs_char_t*)dirent.name, fs->mmgr);
cpfile->dst_fspath = merge_fspath_dup (cfs->cpfile.dst_fspath, (qse_fs_char_t*)dirent.name, fs->mmgr);
if (!cpfile->src_fspath || !cpfile->dst_fspath || prepare_cpfile (fs, cpfile) <= -1)
{
clear_cpfile (fs, cpfile);
goto oops;
}
goto start_over;
resume_copy_dir:
/* do nothing. loop over */
;
#else
QSE_MEMSET (&sub_cpfile, 0, QSE_SIZEOF(sub_cpfile));
sub_cpfile.flags = cpfile->flags & QSE_FS_CPFILE_ALL; /* inherit public flags */
sub_cpfile.src_fspath = merge_fspath_dup (cpfile->src_fspath, (qse_fs_char_t*)dirent.name, fs->mmgr);
@ -406,20 +476,19 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
qse_dir_close (dir);
return -1;
}
x = copy_file (fs, &sub_cpfile); /* TODO: remove recursion */
clear_cpfile (fs, &sub_cpfile);
if (x <= -1)
{
qse_dir_close (dir);
return -1;
}
#endif
}
qse_dir_close (dir);
return 0;
dir = QSE_NULL;
}
else
{
@ -433,7 +502,7 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
{
/* cannot copy a file to itself */
fs->errnum = QSE_FS_EINVAL; /* TODO: better error code */
return -1;
goto oops;
}
if (!(cpfile->flags & QSE_FS_CPFILE_NOTGTDIR) &&
@ -444,7 +513,7 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
/* merge_dstdir_and_file() has been called already.
* no more getting into a subdirectory */
fs->errnum = QSE_FS_EISDIR;
return -1;
goto oops;
}
else
{
@ -462,8 +531,27 @@ static int copy_file (qse_fs_t* fs, cpfile_t* cpfile)
}
/* both source and target are files */
return copy_file_in_fs (fs, cpfile);
if (copy_file_in_fs (fs, cpfile) <= -1) goto oops;
}
#if defined(NO_RECURSION)
if (fs->cfs)
{
clear_cpfile (fs, cpfile); /* clear key data created for subitems in the directory */
pop_cfs (fs, cpfile, &dir); /* restore key data for the original directory*/
goto resume_copy_dir;
}
#endif
return 0;
oops:
#if defined(NO_RECURSION)
while (fs->cfs) pop_cfs (fs, QSE_NULL, QSE_NULL);
#endif
if (dir) qse_dir_close (dir);
return -1;
}
int qse_fs_cpfilembs (qse_fs_t* fs, const qse_mchar_t* srcpath, const qse_mchar_t* dstpath, int flags)