DPDK defines cmdline input buffer size to 512 characters.
That buffer size can be too small for long application input.
For example, the following flow template API testpmd command is 444
bytes long:
```
flow queue 0 create 0 template_table 1000 \
  pattern_template 0 actions_template 0 postpone no \
  pattern eth / ipv4 / udp / end \
  actions modify_field op set dst_type tag dst_level 0 dst_offset 0 \
    src_type value src_value 0x31 width 32 /  \
    modify_field op set dst_type ipv4_src src_type value \
    src_value 10101010 width 32 / modify_field op add dst_type \
    ipv4_ttl dst_level 0 dst_offset 0 src_type value \
    src_value ff width 8 / count / jump group 100 / end
```

The patch increases cmdline input buffer size to the LINE_MAX value,
which typically is 2048 bytes.

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: Morten Brørup <mb@smartsharesystems.com>
---
v2: set RDLINE_BUF_SIZE to LINE_MAX
    change the patch subject.
v3: fix Windows compilation error.
---
 lib/cmdline/cmdline_private.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/cmdline/cmdline_private.h b/lib/cmdline/cmdline_private.h
index b64f363903..f00b025ecb 100644
--- a/lib/cmdline/cmdline_private.h
+++ b/lib/cmdline/cmdline_private.h
@@ -11,13 +11,20 @@
 #include <rte_os_shim.h>
 #ifdef RTE_EXEC_ENV_WINDOWS
 #include <rte_windows.h>
+#ifndef LINE_MAX
+/**
+ * The LINE_MAX value is derived from POSIX.
+ * Windows environment may not have POSIX definitions.
+ */
+#define LINE_MAX 2048
+#endif
 #else
 #include <termios.h>
 #endif
 
 #include <cmdline.h>
 
-#define RDLINE_BUF_SIZE 512
+#define RDLINE_BUF_SIZE LINE_MAX
 #define RDLINE_PROMPT_SIZE  32
 #define RDLINE_VT100_BUF_SIZE  8
 #define RDLINE_HISTORY_BUF_SIZE BUFSIZ
--
2.43.0