It make more sense to use "isprint" than "isalnum" because we use non alphanumeric characters like '%', '_', etc. And, in case of non printable character, print a space is preferable to print a NULL (0) in order to keep alignment. Before: ... |00012|--|00002| |len |flags| type| | 5f 5f 73 65 | | data | s e | 74 25 64 00 | | data | t d ... After: ... |00012|--|00002| |len |flags| type| | 5f 5f 73 65 | | data | _ _ s e | 74 25 64 00 | | data | t % d ... Signed-off-by: Carlos Falgueras García <carlosfg@xxxxxxxxxx> --- src/nlmsg.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/nlmsg.c b/src/nlmsg.c index fd2f698..5dfbd88 100644 --- a/src/nlmsg.c +++ b/src/nlmsg.c @@ -317,10 +317,10 @@ mnl_nlmsg_fprintf_payload(FILE *fd, const struct nlmsghdr *nlh, 0xff & b[i+2], 0xff & b[i+3]); fprintf(fd, "| data |"); fprintf(fd, "\t %c %c %c %c\n", - isalnum(b[i]) ? b[i] : 0, - isalnum(b[i+1]) ? b[i+1] : 0, - isalnum(b[i+2]) ? b[i+2] : 0, - isalnum(b[i+3]) ? b[i+3] : 0); + isprint(b[i]) ? b[i] : ' ', + isprint(b[i+1]) ? b[i+1] : ' ', + isprint(b[i+2]) ? b[i+2] : ' ', + isprint(b[i+3]) ? b[i+3] : ' '); } } fprintf(fd, "----------------\t------------------\n"); -- 2.8.2 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
