emulation on host: add missing strlcat strlcpy (#6327)

tests/host/common/strl.cpp

@@ -0,0 +1,86 @@
+// https://gist.github.com/Fonger/98cc95ac39fbe1a7e4d9
+
+#ifndef HAVE_STRLCAT
+/*
+    '_cups_strlcat()' - Safely concatenate two strings.
+*/
+
+size_t                  /* O - Length of string */
+strlcat(char       *dst,        /* O - Destination string */
+        const char *src,      /* I - Source string */
+        size_t     size)      /* I - Size of destination string buffer */
+{
+    size_t    srclen;         /* Length of source string */
+    size_t    dstlen;         /* Length of destination string */
+
+
+    /*
+        Figure out how much room is left...
+    */
+
+    dstlen = strlen(dst);
+    size   -= dstlen + 1;
+
+    if (!size)
+    {
+        return (dstlen);    /* No room, return immediately... */
+    }
+
+    /*
+        Figure out how much room is needed...
+    */
+
+    srclen = strlen(src);
+
+    /*
+        Copy the appropriate amount...
+    */
+
+    if (srclen > size)
+    {
+        srclen = size;
+    }
+
+    memcpy(dst + dstlen, src, srclen);
+    dst[dstlen + srclen] = '\0';
+
+    return (dstlen + srclen);
+}
+#endif /* !HAVE_STRLCAT */
+
+#ifndef HAVE_STRLCPY
+/*
+    '_cups_strlcpy()' - Safely copy two strings.
+*/
+
+size_t                  /* O - Length of string */
+strlcpy(char       *dst,        /* O - Destination string */
+        const char *src,      /* I - Source string */
+        size_t      size)     /* I - Size of destination string buffer */
+{
+    size_t    srclen;         /* Length of source string */
+
+
+    /*
+        Figure out how much room is needed...
+    */
+
+    size --;
+
+    srclen = strlen(src);
+
+    /*
+        Copy the appropriate amount...
+    */
+
+    if (srclen > size)
+    {
+        srclen = size;
+    }
+
+    memcpy(dst, src, srclen);
+    dst[srclen] = '\0';
+
+    return (srclen);
+}
+#endif /* !HAVE_STRLCPY */