Add strlcpy implementation (esp8266#465)

Author: igrr

hardware/esp8266com/esp8266/cores/esp8266/libc_replacements.c

@@ -94,10 +94,6 @@ size_t ICACHE_FLASH_ATTR strnlen(const char *s, size_t len) {
     return (size_t)(cp - s);
 }
 
-char* strstr(const char *haystack, const char *needle) {
-    return ets_strstr(haystack, needle);
-}
-
 char* ICACHE_FLASH_ATTR strchr(const char * str, int character) {
     while(1) {
         if(*str == 0x00) {
@@ -443,3 +439,56 @@ int* ICACHE_FLASH_ATTR __errno(void) {
     return &errno_var;
 }
 
+
+/*
+ * begin newlib/string/strlcpy.c
+ * 
+ * Copyright (c) 1998 Todd C. Miller <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+size_t ICACHE_FLASH_ATTR strlcpy(char* dst, const char* src, size_t size) {
+    const char *s = src;
+    size_t n = size;
+
+    if (n != 0 && --n != 0) {
+        do {
+            if ((*dst++ = *s++) == 0)
+                break;
+        } while (--n != 0);
+    }
+    
+    if (n == 0) {
+        if (size != 0)
+            *dst = 0;
+        while (*s++);
+    }
+    
+    return(s - src - 1);
+}
+/*
+ * end of newlib/string/strlcpy.c
+ */
+