Add strlcpy() function

Add strlcpy() function and implementation, and use configure to detect
if strlcpy() is natively available on the system.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/strlcpy.c b/lib/strlcpy.c
new file mode 100644
index 0000000..4335359
--- /dev/null
+++ b/lib/strlcpy.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <string.h>
+#include "compiler.h"
+
+/*
+ * Copy src to string dst of size siz.  At most siz-1 characters
+ * will be copied.  Always NUL terminates (unless siz == 0).
+ * Returns strlen(src); if retval >= siz, truncation occurred.
+ */
+#ifndef HAVE_STRLCPY
+
+size_t strlcpy(char *dst, const char *src, size_t siz)
+{
+    char *d = dst;
+    const char *s = src;
+    size_t n = siz;
+
+    /* Copy as many bytes as will fit */
+    if (n != 0) {
+	while (--n != 0) {
+	    if ((*d++ = *s++) == '\0')
+		break;
+	}
+    }
+
+    /* Not enough room in dst, add NUL and traverse rest of src */
+    if (n == 0) {
+	if (siz != 0)
+	    *d = '\0';		/* NUL-terminate dst */
+	while (*s++)
+	    ;
+    }
+
+    return(s - src - 1);	/* count does not include NUL */
+}
+
+#endif