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Fixed incorrect return value from lfs_file_seek

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lfs_file_seek returned the _previous_ file offset on success, where
most standards return the _calculated_ offset on success.

This just falls into me not noticing a mistake, and shows why it's
always helpful to have a second set of eyes on code.
This commit is contained in:
Christopher Haster
2017-09-26 19:50:39 -05:00
parent 273cb7c9c8
commit 984340225b
2 changed files with 26 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
lfs.c
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@@ -1522,8 +1522,6 @@ lfs_soff_t lfs_file_seek(lfs_t *lfs, lfs_file_t *file,
}
// update pos
lfs_off_t pos = file->pos;
if (whence == LFS_SEEK_SET) {
file->pos = off;
} else if (whence == LFS_SEEK_CUR) {
@@ -1540,7 +1538,7 @@ lfs_soff_t lfs_file_seek(lfs_t *lfs, lfs_file_t *file,
file->pos = file->size + off;
}
return pos;
return file->pos;
}
lfs_soff_t lfs_file_tell(lfs_t *lfs, lfs_file_t *file) {

52
tests/test_seek.sh
View File

@@ -133,15 +133,15 @@ tests/test.py << TEST
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_CUR) => pos+size;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_CUR) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) => pos+size;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) >= 0 => 1;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
@@ -174,15 +174,15 @@ tests/test.py << TEST
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_CUR) => pos+size;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_CUR) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) => pos+size;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) >= 0 => 1;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
@@ -211,7 +211,7 @@ tests/test.py << TEST
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_write(&lfs, &file[0], buffer, size) => size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos+size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "doggodogdog", size) => 0;
@@ -219,11 +219,11 @@ tests/test.py << TEST
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "doggodogdog", size) => 0;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) => pos+size;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) >= 0 => 1;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
@@ -254,7 +254,7 @@ tests/test.py << TEST
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_write(&lfs, &file[0], buffer, size) => size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos+size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "doggodogdog", size) => 0;
@@ -262,11 +262,11 @@ tests/test.py << TEST
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => size;
lfs_file_seek(&lfs, &file[0], pos, LFS_SEEK_SET) => pos;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "doggodogdog", size) => 0;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) => pos+size;
lfs_file_seek(&lfs, &file[0], -size, LFS_SEEK_END) >= 0 => 1;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
@@ -288,13 +288,13 @@ tests/test.py << TEST
for (int i = 0; i < sizeof(offsets) / sizeof(offsets[0]); i++) {
lfs_soff_t off = offsets[i];
memcpy(buffer, "hedgehoghog", size);
lfs_file_seek(&lfs, &file[0], off, LFS_SEEK_SET) >= 0 => 1;
lfs_file_seek(&lfs, &file[0], off, LFS_SEEK_SET) => off;
lfs_file_write(&lfs, &file[0], buffer, size) => size;
lfs_file_seek(&lfs, &file[0], off, LFS_SEEK_SET) => off+size;
lfs_file_seek(&lfs, &file[0], off, LFS_SEEK_SET) => off;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "hedgehoghog", size) => 0;
lfs_file_seek(&lfs, &file[0], 0, LFS_SEEK_SET) => off+size;
lfs_file_seek(&lfs, &file[0], 0, LFS_SEEK_SET) => 0;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "kittycatcat", size) => 0;
@@ -312,31 +312,29 @@ tests/test.py << TEST
size = strlen("kittycatcat");
lfs_file_size(&lfs, &file[0]) => $LARGESIZE*size;
lfs_file_seek(&lfs, &file[0],
($LARGESIZE+$SMALLSIZE)*size, LFS_SEEK_SET) => 0;
lfs_file_seek(&lfs, &file[0], ($LARGESIZE+$SMALLSIZE)*size,
LFS_SEEK_SET) => ($LARGESIZE+$SMALLSIZE)*size;
lfs_file_read(&lfs, &file[0], buffer, size) => 0;
memcpy(buffer, "porcupineee", size);
lfs_file_write(&lfs, &file[0], buffer, size) => size;
lfs_file_seek(&lfs, &file[0],
($LARGESIZE+$SMALLSIZE)*size, LFS_SEEK_SET) =>
($LARGESIZE+$SMALLSIZE+1)*size;
lfs_file_seek(&lfs, &file[0], ($LARGESIZE+$SMALLSIZE)*size,
LFS_SEEK_SET) => ($LARGESIZE+$SMALLSIZE)*size;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "porcupineee", size) => 0;
lfs_file_seek(&lfs, &file[0],
$LARGESIZE*size, LFS_SEEK_SET) =>
($LARGESIZE+$SMALLSIZE+1)*size;
lfs_file_seek(&lfs, &file[0], $LARGESIZE*size,
LFS_SEEK_SET) => $LARGESIZE*size;
lfs_file_read(&lfs, &file[0], buffer, size) => size;
memcmp(buffer, "\0\0\0\0\0\0\0\0\0\0\0", size) => 0;
lfs_file_seek(&lfs, &file[0],
-(($LARGESIZE+$SMALLSIZE)*size), LFS_SEEK_CUR) => LFS_ERR_INVAL;
lfs_file_seek(&lfs, &file[0], -(($LARGESIZE+$SMALLSIZE)*size),
LFS_SEEK_CUR) => LFS_ERR_INVAL;
lfs_file_tell(&lfs, &file[0]) => ($LARGESIZE+1)*size;
lfs_file_seek(&lfs, &file[0],
-(($LARGESIZE+2*$SMALLSIZE)*size), LFS_SEEK_END) => LFS_ERR_INVAL;
lfs_file_seek(&lfs, &file[0], -(($LARGESIZE+2*$SMALLSIZE)*size),
LFS_SEEK_END) => LFS_ERR_INVAL;
lfs_file_tell(&lfs, &file[0]) => ($LARGESIZE+1)*size;
lfs_file_close(&lfs, &file[0]) => 0;