*: move get_sock_lsa and xwrite_str to libbb, use where appropriate

function                                             old     new   delta
get_sock_lsa                                           -      72     +72
buffer_fill_and_print                                179     196     +17
parse_expr                                           824     832      +8
read_base64                                          343     348      +5
nameval                                              202     206      +4
fbset_main                                          1694    1698      +4
expand                                              1849    1853      +4
udhcp_send_kernel_packet                             249     252      +3
udhcp_get_option                                     223     222      -1
chat_main                                           1246    1245      -1
pack_gzip                                           1661    1659      -2
doset                                                299     297      -2
bb__parsespent                                       119     117      -2
test_main                                            260     257      -3
qgravechar                                           109     106      -3
tcpudpsvd_main                                      1834    1830      -4
sysctl_display_all                                   589     580      -9
xopen_xwrite_close                                    44      33     -11
prs                                                   30      18     -12
find_main                                            418     406     -12
full_write2_str                                       25      12     -13
adduser_main                                         667     654     -13
evaltreenr                                           817     802     -15
evaltree                                             817     802     -15
tftpd_main                                           526     493     -33
ftpd_main                                           2050    1990     -60
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 7/18 up/down: 117/-211)         Total: -94 bytes

1 files changed, 4 insertions, 4 deletions

diff --git a/shell/msh.c b/shell/msh.c
index 0cb81fee7..5f8c90ef6 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -743,7 +743,7 @@ static void print_tree(struct op *head)
 static void prs(const char *s)
 {
         if (*s)
-                write(STDERR_FILENO, s, strlen(s));
+                xwrite_str(STDERR_FILENO, s);
 }
 
 static void prn(unsigned u)
@@ -3600,7 +3600,7 @@ static int doset(struct op *t UNUSED_PARAM, char **args)
         cp = args[1];
         if (cp == NULL) {
                 for (vp = vlist; vp; vp = vp->next)
-                        varput(vp->name, 1);
+                        varput(vp->name, STDOUT_FILENO);
                 return 0;
         }
         if (*cp == '-') {
@@ -3639,8 +3639,8 @@ static int doset(struct op *t UNUSED_PARAM, char **args)
 static void varput(char *s, int out)
 {
         if (isalnum(*s) || *s == '_') {
-                write(out, s, strlen(s));
-                write(out, "\n", 1);
+                xwrite_str(out, s);
+                xwrite(out, "\n", 1);
         }
 }