preparatory cleanups for seamless uncompression improvements

unpack_gz_stream_with_info: fix buggy error check
man: fix possible accesses past the end of a string
move seamless uncompression helpers from read_printf.c to open_transformer.c

function                                             old     new   delta
show_manpage                                         153     212     +59
unpack_gz_stream_with_info                           520     539     +19

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/libbb.h b/include/libbb.h
index f743bdfc6..c896e5484 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -713,6 +713,14 @@ extern void *xmalloc_read(int fd, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
 extern void *xmalloc_open_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
 /* Never returns NULL */
 extern void *xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
+
+#define SEAMLESS_COMPRESSION (0 \
+ || ENABLE_FEATURE_SEAMLESS_XZ \
+ || ENABLE_FEATURE_SEAMLESS_LZMA \
+ || ENABLE_FEATURE_SEAMLESS_BZ2 \
+ || ENABLE_FEATURE_SEAMLESS_GZ \
+ || ENABLE_FEATURE_SEAMLESS_Z)
+
 /* Autodetects gzip/bzip2 formats. fd may be in the middle of the file! */
 #if ENABLE_FEATURE_SEAMLESS_LZMA \
  || ENABLE_FEATURE_SEAMLESS_BZ2 \