[PATCH v3] app/testpmd: fix hex string parser input length

[Gregory Etelson <getelson@nvidia.com>]

Current hex string parser assumes input has even characters number.
The parser fails input string with odd length.

The patch parses hex strings with even and odd length.
Parse result of an input with odd length will match result of
even length input, that has `0` as MSB, following by the original
sequence.
For example:
"0x1" results in *dst={0x01, 0x00}, *size=1
"0xabc" results in *dst={0x0a, 0xbc, 0x00}, *size=2

Cc: stable@dpdk.org

Fixes: 169a9fed1f4c ("app/testpmd: fix hex string parser support for flow API")
Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Reviewed-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
v2: Return error after snprintf failure.
v3: Update returned size.
    Update the patch comment.
---
 app/test-pmd/cmdline_flow.c | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 1b00ae507b..bbe3dc0115 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -7702,9 +7702,8 @@ parse_string(struct context *ctx, const struct token *token,
 static int
 parse_hex_string(const char *src, uint8_t *dst, uint32_t *size)
 {
-	char *c = NULL;
-	uint32_t i, len;
-	char tmp[3];
+	uint32_t left = *size;
+	const uint8_t *head = dst;
 
 	/* Check input parameters */
 	if ((src == NULL) ||
@@ -7714,19 +7713,23 @@ parse_hex_string(const char *src, uint8_t *dst, uint32_t *size)
 		return -1;
 
 	/* Convert chars to bytes */
-	for (i = 0, len = 0; i < *size; i += 2) {
-		snprintf(tmp, 3, "%s", src + i);
-		dst[len++] = strtoul(tmp, &c, 16);
-		if (*c != 0) {
-			len--;
-			dst[len] = 0;
-			*size = len;
+	while (left) {
+		char tmp[3], *end = tmp;
+		uint32_t read_lim = left & 1 ? 1 : 2;
+
+		snprintf(tmp, read_lim + 1, "%s", src);
+		*dst = strtoul(tmp, &end, 16);
+		if (*end) {
+			*dst = 0;
+			*size = (uint32_t)(dst - head);
 			return -1;
 		}
+		left -= read_lim;
+		src += read_lim;
+		dst++;
 	}
-	dst[len] = 0;
-	*size = len;
-
+	*dst = 0;
+	*size = (uint32_t)(dst - head);
 	return 0;
 }
 
-- 
2.34.0