*: 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

13 files changed, 35 insertions, 56 deletions

diff --git a/e2fsprogs/old_e2fsprogs/e2fsck.c b/e2fsprogs/old_e2fsprogs/e2fsck.c
index 6ade0db16..d1f8d1ecb 100644
--- a/e2fsprogs/old_e2fsprogs/e2fsck.c
+++ b/e2fsprogs/old_e2fsprogs/e2fsck.c
@@ -12892,7 +12892,7 @@ static int e2fsck_update_progress(e2fsck_t ctx, int pass,
 
         if (ctx->progress_fd) {
                 sprintf(buf, "%d %lu %lu\n", pass, cur, max);
-                write(ctx->progress_fd, buf, strlen(buf));
+                xwrite_str(ctx->progress_fd, buf);
         } else {
                 percent = calc_percent(&e2fsck_tbl, pass, cur, max);
                 e2fsck_simple_progress(ctx, ctx->device_name,
diff --git a/include/libbb.h b/include/libbb.h
index 3e21cbf90..7d6ea9029 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -489,6 +489,8 @@ int create_and_bind_dgram_or_die(const char *bindaddr, int port) FAST_FUNC;
 int create_and_connect_stream_or_die(const char *peer, int port) FAST_FUNC;
 /* Connect to peer identified by lsa */
 int xconnect_stream(const len_and_sockaddr *lsa) FAST_FUNC;
+/* Get local address of bound or accepted socket */
+len_and_sockaddr *get_sock_lsa(int fd) FAST_FUNC;
 /* Return malloc'ed len_and_sockaddr with socket address of host:port
  * Currently will return IPv4 or IPv6 sockaddrs only
  * (depending on host), but in theory nothing prevents e.g.
@@ -607,6 +609,7 @@ extern ssize_t safe_write(int fd, const void *buf, size_t count) FAST_FUNC;
 // if some data was written before error occurred
 extern ssize_t full_write(int fd, const void *buf, size_t count) FAST_FUNC;
 extern void xwrite(int fd, const void *buf, size_t count) FAST_FUNC;
+extern void xwrite_str(int fd, const char *str) FAST_FUNC;
 extern void xopen_xwrite_close(const char* file, const char *str) FAST_FUNC;
 
 /* Reads and prints to stdout till eof, then closes FILE. Exits on error: */
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 13cdb819f..80380ae08 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -99,7 +99,7 @@ static const char *unpack_usage_messages(void)
 
 static void full_write2_str(const char *str)
 {
-        full_write(STDERR_FILENO, str, strlen(str));
+        xwrite_str(STDERR_FILENO, str);
 }
 
 void FAST_FUNC bb_show_usage(void)
diff --git a/libbb/write.c b/libbb/write.c
index 37f461720..116e4d153 100644
--- a/libbb/write.c
+++ b/libbb/write.c
@@ -10,11 +10,10 @@
 #include "libbb.h"
 
 /* Open file and write string str to it, close file.
- * Die on any open or write-error.  */
+ * Die on any open or write error.  */
 void FAST_FUNC xopen_xwrite_close(const char* file, const char* str)
 {
         int fd = xopen(file, O_WRONLY);
-
-        xwrite(fd, str, strlen(str));
+        xwrite_str(fd, str);
         close(fd);
 }
diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index 2eb4cb9be..975844500 100644
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -35,6 +35,19 @@ int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
         return r;
 }
 
+len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
+{
+        len_and_sockaddr *lsa;
+        socklen_t len = 0;
+
+        /* Can be optimized to do only one getsockname() */
+        if (getsockname(fd, NULL, &len) != 0)
+                return NULL;
+        lsa = xzalloc(LSA_LEN_SIZE + len);
+        lsa->len = len;
+        getsockname(fd, &lsa->u.sa, &lsa->len);
+        return lsa;
+}
 
 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
 {
@@ -51,8 +64,9 @@ void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
 
 /* Return port number for a service.
  * If "port" is a number use it as the port.
- * If "port" is a name it is looked up in /etc/services, if it isnt found return
- * default_port */
+ * If "port" is a name it is looked up in /etc/services,
+ * if it isnt found return default_port
+ */
 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
 {
         unsigned port_nr = default_port;
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index cd0f84dea..6d0fa6e8d 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -208,6 +208,10 @@ void FAST_FUNC xwrite(int fd, const void *buf, size_t count)
                         bb_error_msg_and_die("short write");
         }
 }
+void FAST_FUNC xwrite_str(int fd, const char *str)
+{
+        xwrite(fd, str, strlen(str));
+}
 
 // Die with an error message if we can't lseek to the right spot.
 off_t FAST_FUNC xlseek(int fd, off_t offset, int whence)
diff --git a/loginutils/adduser.c b/loginutils/adduser.c
index d4b50130c..17b5088ec 100644
--- a/loginutils/adduser.c
+++ b/loginutils/adduser.c
@@ -145,7 +145,7 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
                                 /*99999,*/              /* sp->sp_max */
                                 /*7*/                   /* sp->sp_warn */
                 );
-                xwrite(fd, s, strlen(s));
+                xwrite_str(fd, s);
                 close(fd);
         }
 #endif
diff --git a/loginutils/getty.c b/loginutils/getty.c
index ba5b0d6c8..467316fb8 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -713,6 +713,7 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
         /* Write the modem init string and DON'T flush the buffers */
         if (options.flags & F_INITSTRING) {
                 debug("writing init string\n");
+                /* todo: use xwrite_str? */
                 full_write(STDOUT_FILENO, options.initstring, strlen(options.initstring));
         }
 
diff --git a/modutils/modutils-24.c b/modutils/modutils-24.c
index 451975ab9..169fe54ae 100644
--- a/modutils/modutils-24.c
+++ b/modutils/modutils-24.c
@@ -3513,7 +3513,7 @@ static void set_tainted(int fd, const char *m_name,
                 buf[sizeof(buf)-1] = '\0';
                 oldval = strtoul(buf, NULL, 10);
                 sprintf(buf, "%d\n", oldval | taint);
-                write(fd, buf, strlen(buf));
+                xwrite_str(fd, buf);
         }
 }
 
diff --git a/networking/ftpd.c b/networking/ftpd.c
index 91cbc17f4..6289edf0c 100644
--- a/networking/ftpd.c
+++ b/networking/ftpd.c
@@ -107,14 +107,6 @@ struct globals {
 #define G (*(struct globals*)&bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
-
-// libbb candidate?
-static void
-xwrite_str(int fd, const char *str)
-{
-        xwrite(fd, str, strlen(str));
-}
-
 static char *
 replace_text(const char *str, const char from, const char *to)
 {
@@ -918,20 +910,6 @@ handle_stou(void)
 }
 #endif /* ENABLE_FEATURE_FTP_WRITE */
 
-/* TODO: libbb candidate (tftp has another copy) */
-static len_and_sockaddr *get_sock_lsa(int s)
-{
-        len_and_sockaddr *lsa;
-        socklen_t len = 0;
-
-        if (getsockname(s, NULL, &len) != 0)
-                return NULL;
-        lsa = xzalloc(LSA_LEN_SIZE + len);
-        lsa->len = len;
-        getsockname(s, &lsa->u.sa, &lsa->len);
-        return lsa;
-}
-
 int ftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ftpd_main(int argc UNUSED_PARAM, char **argv)
 {
diff --git a/networking/tftp.c b/networking/tftp.c
index 799dd9903..fa0851615 100644
--- a/networking/tftp.c
+++ b/networking/tftp.c
@@ -622,21 +622,6 @@ int tftp_main(int argc UNUSED_PARAM, char **argv)
 #endif /* ENABLE_TFTP */
 
 #if ENABLE_TFTPD
-
-/* TODO: libbb candidate? */
-static len_and_sockaddr *get_sock_lsa(int s)
-{
-        len_and_sockaddr *lsa;
-        socklen_t len = 0;
-
-        if (getsockname(s, NULL, &len) != 0)
-                return NULL;
-        lsa = xzalloc(LSA_LEN_SIZE + len);
-        lsa->len = len;
-        getsockname(s, &lsa->u.sa, &lsa->len);
-        return lsa;
-}
-
 int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tftpd_main(int argc UNUSED_PARAM, char **argv)
 {
diff --git a/procps/sysctl.c b/procps/sysctl.c
index d59e2690a..862cd1756 100644
--- a/procps/sysctl.c
+++ b/procps/sysctl.c
@@ -21,11 +21,6 @@ static int sysctl_display_all(const char *path);
 static int sysctl_handle_preload_file(const char *filename);
 static void sysctl_dots_to_slashes(char *name);
 
-static void dwrite_str(int fd, const char *buf)
-{
-        write(fd, buf, strlen(buf));
-}
-
 enum {
         FLAG_SHOW_KEYS       = 1 << 0,
         FLAG_SHOW_KEY_ERRORS = 1 << 1,
@@ -147,7 +142,7 @@ static int sysctl_act_on_setting(char *setting)
         }
 
         if (option_mask32 & FLAG_WRITE) {
-                dwrite_str(fd, value);
+                xwrite_str(fd, value);
                 close(fd);
                 if (option_mask32 & FLAG_SHOW_KEYS)
                         printf("%s = ", outname);
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);
         }
 }