lpd: spool mode added by Vladimir

lpr: more robust error reporting
*: introduce and use xchroot
libbb: full_read/write now will report partial data counts prior to error
isdirectory.c: style fixes

lpd_main                                             249     486    +237
xchroot                                                -      29     +29
get_response_or_say_and_die                          110     139     +29
full_write                                            52      60      +8
full_read                                             55      63      +8
static.newline                                         1       -      -1
switch_root_main                                     404     400      -4
chpst_main                                          1089    1079     -10
getopt32                                            1370    1359     -11
chroot_main                                          115     101     -14
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 4/4 up/down: 311/-40)           Total: 271 bytes
   text    data     bss     dec     hex filename
 798472     728    7484  806684   c4f1c busybox_old
 798775     728    7484  806987   c504b busybox_unstripped

1 files changed, 5 insertions, 0 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 48937c4b1..1ea2e35be 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -315,6 +315,7 @@ void kill_myself_with_sig(int sig) ATTRIBUTE_NORETURN;
 void xsetgid(gid_t gid);
 void xsetuid(uid_t uid);
 void xchdir(const char *path);
+void xchroot(const char *path);
 void xsetenv(const char *key, const char *value);
 void xunlink(const char *pathname);
 void xstat(const char *pathname, struct stat *buf);
@@ -500,6 +501,8 @@ extern void *xrealloc(void *old, size_t size);
 
 extern ssize_t safe_read(int fd, void *buf, size_t count);
 extern ssize_t nonblock_safe_read(int fd, void *buf, size_t count);
+// NB: will return short read on error, not -1,
+// if some data was read before error occurred
 extern ssize_t full_read(int fd, void *buf, size_t count);
 extern void xread(int fd, void *buf, size_t count);
 extern unsigned char xread_char(int fd);
@@ -514,6 +517,8 @@ extern ssize_t open_read_close(const char *filename, void *buf, size_t count);
 extern void *xmalloc_open_read_close(const char *filename, size_t *sizep);
 
 extern ssize_t safe_write(int fd, const void *buf, size_t count);
+// NB: will return short write on error, not -1,
+// if some data was written before error occurred
 extern ssize_t full_write(int fd, const void *buf, size_t count);
 extern void xwrite(int fd, const void *buf, size_t count);