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Diffstat (limited to 'lib/common')
-rw-r--r--lib/common/data_reader_dump.c57
1 files changed, 28 insertions, 29 deletions
diff --git a/lib/common/data_reader_dump.c b/lib/common/data_reader_dump.c
index 4053f73..4065677 100644
--- a/lib/common/data_reader_dump.c
+++ b/lib/common/data_reader_dump.c
@@ -12,26 +12,23 @@
#include <stdio.h>
#include <errno.h>
-static int append_block(int fd, const sqfs_block_t *blk)
+static int append_block(FILE *fp, const sqfs_block_t *blk)
{
const unsigned char *ptr = blk->data;
- size_t size = blk->size;
- ssize_t ret;
+ size_t ret, size = blk->size;
while (size > 0) {
- ret = write(fd, ptr, size);
-
- if (ret < 0) {
- if (errno == EINTR)
- continue;
- perror("writing data block");
+ if (ferror(fp)) {
+ fputs("writing data block: error writing to file\n",
+ stderr);
}
- if (ret == 0) {
+ if (feof(fp)) {
fputs("writing data block: unexpected end of file\n",
stderr);
}
+ ret = fwrite(ptr, 1, size, fp);
ptr += ret;
size -= ret;
}
@@ -41,7 +38,7 @@ static int append_block(int fd, const sqfs_block_t *blk)
int sqfs_data_reader_dump(const char *name, sqfs_data_reader_t *data,
const sqfs_inode_generic_t *inode,
- int outfd, size_t block_size, bool allow_sparse)
+ FILE *fp, size_t block_size, bool allow_sparse)
{
sqfs_block_t *blk;
sqfs_u64 filesz;
@@ -50,21 +47,23 @@ int sqfs_data_reader_dump(const char *name, sqfs_data_reader_t *data,
sqfs_inode_get_file_size(inode, &filesz);
- if (allow_sparse && ftruncate(outfd, filesz))
- goto fail_sparse;
+#if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200112L)
+ if (allow_sparse) {
+ int fd = fileno(fp);
+
+ if (ftruncate(fd, filesz))
+ goto fail_sparse;
+ }
+#else
+ allow_sparse = false;
+#endif
for (i = 0; i < inode->num_file_blocks; ++i) {
+ diff = (filesz < block_size) ? filesz : block_size;
+
if (SQFS_IS_SPARSE_BLOCK(inode->block_sizes[i]) &&
allow_sparse) {
- if (filesz < block_size) {
- diff = filesz;
- filesz = 0;
- } else {
- diff = block_size;
- filesz -= block_size;
- }
-
- if (lseek(outfd, diff, SEEK_CUR) == (off_t)-1)
+ if (fseek(fp, diff, SEEK_CUR) < 0)
goto fail_sparse;
} else {
err = sqfs_data_reader_get_block(data, inode, i, &blk);
@@ -73,14 +72,14 @@ int sqfs_data_reader_dump(const char *name, sqfs_data_reader_t *data,
return -1;
}
- if (append_block(outfd, blk)) {
- free(blk);
- return -1;
- }
-
- filesz -= blk->size;
+ err = append_block(fp, blk);
free(blk);
+
+ if (err)
+ return -1;
}
+
+ filesz -= diff;
}
if (filesz > 0) {
@@ -90,7 +89,7 @@ int sqfs_data_reader_dump(const char *name, sqfs_data_reader_t *data,
return -1;
}
- if (append_block(outfd, blk)) {
+ if (append_block(fp, blk)) {
free(blk);
return -1;
}