*: use is_prefixed_with() where appropriate

function                                             old     new   delta
resume_main                                          560     556      -4
uuidcache_check_device                               107     101      -6
ntp_init                                            1005     997      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-18)             Total: -18 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 4 insertions, 4 deletions

diff --git a/klibc-utils/resume.c b/klibc-utils/resume.c
index fde5587e2..179413627 100644
--- a/klibc-utils/resume.c
+++ b/klibc-utils/resume.c
@@ -39,7 +39,7 @@ static dev_t name_to_dev_t(const char *devname)
         struct stat st;
         int r;
 
-        if (strncmp(devname, "/dev/", 5) != 0) {
+        if (!is_prefixed_with(devname, "/dev/")) {
                 char *cptr;
 
                 cptr = strchr(devname, ':');
diff --git a/networking/ntpd.c b/networking/ntpd.c
index efe9f5326..595000b11 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -2395,7 +2395,7 @@ static NOINLINE void ntp_init(char **argv)
                 while (peers) {
                         char *peer = llist_pop(&peers);
                         key_entry_t *key_entry = NULL;
-                        if (strncmp(peer, "keyno:", 6) == 0) {
+                        if (is_prefixed_with(peer, "keyno:")) {
                                 char *end;
                                 int key_id;
                                 peer += 6;
diff --git a/shell/ash.c b/shell/ash.c
index 2f30857d7..4f824e1b2 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -1149,7 +1149,7 @@ static void dbg_show_dirtymem(const char *msg)
         p = buf;
         for (;;) {
                 char *e = strchrnul(p, '\n');
-                if (strncmp(p, "Private_Dirty:", 14) == 0) {
+                if (is_prefixed_with(p, "Private_Dirty:")) {
                         p = skip_whitespace(p + 14);
                         bb_error_msg("%s:%.*s", msg, (int)(e - p), p);
                         break;
diff --git a/util-linux/volume_id/get_devname.c b/util-linux/volume_id/get_devname.c
index 39155f256..52bb8e03a 100644
--- a/util-linux/volume_id/get_devname.c
+++ b/util-linux/volume_id/get_devname.c
@@ -110,7 +110,7 @@ uuidcache_check_device(struct recursive_state *state UNUSED_PARAM,
         /* note: this check rejects links to devices, among other nodes */
         if (!S_ISBLK(statbuf->st_mode)
 #if ENABLE_FEATURE_VOLUMEID_UBIFS
-         && !(S_ISCHR(statbuf->st_mode) && strncmp(bb_basename(device), "ubi", 3) == 0)
+         && !(S_ISCHR(statbuf->st_mode) && is_prefixed_with(bb_basename(device), "ubi"))
 #endif
         )
                 return TRUE;