libbb: introduce fputc_printable (from ed)

netstat: print control chars as ^C etc
vi: style fixlet

function                                             old     new   delta
fputc_printable                                        -     100    +100
unix_do_one                                          451     487     +36
printLines                                           258     190     -68
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 136/-68)            Total: 68 bytes

1 files changed, 10 insertions, 7 deletions

diff --git a/networking/netstat.c b/networking/netstat.c
index 29c2384..348abd8 100644
--- a/networking/netstat.c
+++ b/networking/netstat.c
@@ -349,13 +349,9 @@ static int unix_do_one(int nr, char *line)
 	const char *ss_proto, *ss_state, *ss_type;
 	char ss_flags[32];
 
-	/* TODO: currently we stop at first NUL byte. Is it a problem? */
-
 	if (nr == 0)
 		return 0; /* skip header */
 
-	*strchrnul(line, '\n') = '\0';
-
 	/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
 	 * Other users report long lines filled by NUL bytes. 
 	 * (those ^@ are NUL bytes too). We see them as empty lines. */
@@ -443,9 +439,16 @@ static int unix_do_one(int nr, char *line)
 		strcat(ss_flags, "N ");
 	strcat(ss_flags, "]");
 
-	printf("%-5s %-6ld %-11s %-10s %-13s %6lu %s\n",
-		ss_proto, refcnt, ss_flags, ss_type, ss_state, inode,
-		line + path_ofs);
+	printf("%-5s %-6ld %-11s %-10s %-13s %6lu ",
+		ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
+		);
+
+	/* TODO: currently we stop at first NUL byte. Is it a problem? */
+	line += path_ofs;
+	*strchrnul(line, '\n') = '\0';
+	while (*line)
+		fputc_printable(*line++, stdout);
+	bb_putchar('\n');
 	return 0;
 }