ftpd: fix command fetching to not do it in 1-byte reads;

 fix command de-escaping. Tested to download files with embeeded \xff and LF.
libbb: tweaks for the above

function                                             old     new   delta
ftpd_main                                           2231    2321     +90
xmalloc_fgets_internal                               190     222     +32
xmalloc_fgets_str_len                                  -      27     +27
xmalloc_fgets_str                                      7      23     +16
xmalloc_fgetline_str                                  10      26     +16
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/0 up/down: 181/0)             Total: 181 bytes

1 files changed, 3 insertions, 3 deletions

diff --git a/libbb/read.c b/libbb/read.c
index 815007c1e..37503e84d 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -141,7 +141,7 @@ char* FAST_FUNC xmalloc_reads(int fd, char *buf, size_t *maxsz_p)
 {
         char *p;
         size_t sz = buf ? strlen(buf) : 0;
-        size_t maxsz = maxsz_p ? *maxsz_p : MAXINT(size_t);
+        size_t maxsz = maxsz_p ? *maxsz_p : (INT_MAX - 4095);
 
         goto jump_in;
         while (sz < maxsz) {
@@ -198,7 +198,7 @@ void* FAST_FUNC xmalloc_read(int fd, size_t *maxsz_p)
         size_t to_read;
         struct stat st;
 
-        to_read = maxsz_p ? *maxsz_p : MAXINT(ssize_t); /* max to read */
+        to_read = maxsz_p ? *maxsz_p : (INT_MAX - 4095); /* max to read */
 
         /* Estimate file size */
         st.st_size = 0; /* in case fstat fails, assume 0 */
@@ -262,7 +262,7 @@ void* FAST_FUNC xmalloc_open_read_close(const char *filename, size_t *maxsz_p)
         len = lseek(fd, 0, SEEK_END) | 0x3ff; /* + up to 1k */
         if (len != (off_t)-1) {
                 xlseek(fd, 0, SEEK_SET);
-                size = maxsz_p ? *maxsz_p : INT_MAX;
+                size = maxsz_p ? *maxsz_p : (INT_MAX - 4095);
                 if (len < size)
                         size = len;
         }