Add memBEGINs(), memENDs() and use them in APItest

memBEGINs() is like strBEGINs(), but can be used for buffers without
trailing NULs.  It can also be used when there is a trailing NUL, and
the length is known, as it should be somewhat faster, only having to
check for one ending condition.

Same for memENDs vs strENDs

1 files changed, 7 insertions, 0 deletions

diff --git a/handy.h b/handy.h
index d4a8aaaf3b..06db1e25a6 100644
--- a/handy.h
+++ b/handy.h
@@ -492,6 +492,13 @@ Returns zero if non-equal, or non-zero if equal.
         (memEQ((s1), ("" s2 ""), (sizeof(s2)-1)))
 #define _memNEs(s1, s2) (memNE((s1),("" s2 ""),(sizeof(s2)-1)))
 
+#define memBEGINs(s1, l, s2)                                                \
+            (   (l) >= sizeof(s2) - 1                                       \
+             && memEQ(s1, "" s2 "", sizeof(s2)-1))
+#define memENDs(s1, l, s2)                                                  \
+            (   (l) >= sizeof(s2) - 1                                       \
+             && memEQ(s1 + (l) - (sizeof(s2) - 1), "" s2 "", sizeof(s2)-1))
+
 #define memLT(s1,s2,l) (memcmp(s1,s2,l) < 0)
 #define memLE(s1,s2,l) (memcmp(s1,s2,l) <= 0)
 #define memGT(s1,s2,l) (memcmp(s1,s2,l) > 0)