Add build system support for strlcpy and strlcat on platforms which do

not provide it natively.

ticket: 6200
status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@20916 dc483132-0cff-0310-8789-dd5450dbe970

5 files changed, 134 insertions, 0 deletions

diff --git a/README b/README
index c281205986..251f7dcc87 100644
--- a/README
+++ b/README
@@ -594,6 +594,26 @@ THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 
+                         --------------------
+
+The implementations of strlcpy and strlcat in
+src/util/support/strlcat.c have the following copyright and permission
+notice:
+
+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.
+
 
 Acknowledgements
 ----------------
diff --git a/src/configure.in b/src/configure.in
index 7a434cbf39..174f7d97c2 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -90,7 +90,16 @@ AC_SUBST(LIBUTIL)
 dnl for kdc
 AC_CHECK_HEADERS(syslog.h stdarg.h sys/select.h sys/sockio.h ifaddrs.h unistd.h)
 AC_CHECK_FUNCS(openlog syslog closelog strftime vsprintf vasprintf vsnprintf)
+AC_CHECK_FUNCS(strlcpy)
 EXTRA_SUPPORT_SYMS=
+AC_CHECK_FUNC(strlcpy,
+[STRLCPY_ST_OBJ=
+STRLCPY_OBJ=],
+[STRLCPY_ST_OBJ=strlcpy.o
+STRLCPY_OBJ='$(OUTPRE)strlcpy.$(OBJEXT)'
+EXTRA_SUPPORT_SYMS="$EXTRA_SUPPORT_SYMS krb5int_strlcpy krb5int_strlcat"])
+AC_SUBST(STRLCPY_OBJ)
+AC_SUBST(STRLCPY_ST_OBJ)
 AC_CHECK_FUNC(vasprintf,
 [PRINTF_ST_OBJ=
 PRINTF_OBJ=],
diff --git a/src/include/k5-platform.h b/src/include/k5-platform.h
index 279d6fd968..f4511278e7 100644
--- a/src/include/k5-platform.h
+++ b/src/include/k5-platform.h
@@ -860,6 +860,14 @@ set_cloexec_file(FILE *f)
 #define va_copy(dest, src)	memcmp(dest, src, sizeof(va_list))
 #endif
 
+/* Provide strlcpy/strlcat interfaces. */
+#ifndef HAVE_STRLCPY
+#define strlcpy krb5int_strlcpy
+#define strlcat krb5int_strlcat
+extern size_t krb5int_strlcpy(char *dst, const char *src, size_t siz);
+extern size_t krb5int_strlcat(char *dst, const char *src, size_t siz);
+#endif
+
 /* Provide [v]asprintf interfaces.  */
 #ifndef HAVE_VSNPRINTF
 #ifdef _WIN32
diff --git a/src/util/support/Makefile.in b/src/util/support/Makefile.in
index 4fc6b1d69a..d931a1f02b 100644
--- a/src/util/support/Makefile.in
+++ b/src/util/support/Makefile.in
@@ -30,6 +30,9 @@ MKSTEMP_OBJ= @MKSTEMP_OBJ@
 ##DOS##MKSTEMP_ST_OBJ= mkstemp.o
 ##DOS##MKSTEMP_OBJ= $(OUTPRE)mkstemp.$(OBJEXT)
 
+STRLCPY_ST_OBJ=@STRLCPY_ST_OBJ@
+STRLCPY_OBJ=@STRLCPY_OBJ@
+
 PRINTF_ST_OBJ= @PRINTF_ST_OBJ@
 PRINTF_OBJ= @PRINTF_OBJ@
 
@@ -40,6 +43,7 @@ STLIBOBJS= \
 	errors.o \
 	gmt_mktime.o \
 	fake-addrinfo.o \
+	$(STRLCPY_ST_OBJ) \
 	$(PRINTF_ST_OBJ) \
 	$(MKSTEMP_ST_OBJ)
 
@@ -50,6 +54,7 @@ LIBOBJS= \
 	$(OUTPRE)errors.$(OBJEXT) \
 	$(OUTPRE)gmt_mktime.$(OBJEXT) \
 	$(OUTPRE)fake-addrinfo.$(OBJEXT) \
+	$(STRLCPY_OBJ) \
 	$(PRINTF_OBJ) \
 	$(MKSTEMP_OBJ)
 
@@ -65,6 +70,7 @@ SRCS=\
 	$(srcdir)/errors.c \
 	$(srcdir)/gmt_mktime.c \
 	$(srcdir)/fake-addrinfo.c \
+	$(srcdir)/strlcpy.c \
 	$(srcdir)/printf.c \
 	$(srcdir)/mkstemp.c
 
@@ -140,6 +146,9 @@ fake-addrinfo.so fake-addrinfo.po $(OUTPRE)fake-addrinfo.$(OBJEXT): \
   $(SRCTOP)/include/k5-platform.h $(SRCTOP)/include/k5-thread.h \
   $(SRCTOP)/include/port-sockets.h $(SRCTOP)/include/socket-utils.h \
   cache-addrinfo.h fake-addrinfo.c supp-int.h
+strlcpy.so strlcpy.po $(OUTPRE)strlcpy.$(OBJEXT): \
+  $(BUILDTOP)/include/autoconf.h $(SRCTOP)/include/k5-platform.h \
+  $(SRCTOP)/include/k5-thread.h strlcpy.c
 printf.so printf.po $(OUTPRE)printf.$(OBJEXT): $(BUILDTOP)/include/autoconf.h \
   $(SRCTOP)/include/k5-platform.h $(SRCTOP)/include/k5-thread.h \
   printf.c
diff --git a/src/util/support/strlcpy.c b/src/util/support/strlcpy.c
new file mode 100644
index 0000000000..fd2c79b76f
--- /dev/null
+++ b/src/util/support/strlcpy.c
@@ -0,0 +1,88 @@
+#include "k5-platform.h"
+
+/* Provide strlcpy and strlcat for platforms that don't have them. */
+
+/*
+ * 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>
+
+/*
+ * 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.
+ */
+size_t
+krb5int_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 */
+}
+
+/*
+ * Appends src to string dst of size siz (unlike strncat, siz is the
+ * full size of dst, not space left).  At most siz-1 characters
+ * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
+ * Returns strlen(src) + MIN(siz, strlen(initial dst)).
+ * If retval >= siz, truncation occurred.
+ */
+size_t
+krb5int_strlcat(char *dst, const char *src, size_t siz)
+{
+	char *d = dst;
+	const char *s = src;
+	size_t n = siz;
+	size_t dlen;
+
+	/* Find the end of dst and adjust bytes left but don't go past end */
+	while (n-- != 0 && *d != '\0')
+		d++;
+	dlen = d - dst;
+	n = siz - dlen;
+
+	if (n == 0)
+		return(dlen + strlen(s));
+	while (*s != '\0') {
+		if (n != 1) {
+			*d++ = *s;
+			n--;
+		}
+		s++;
+	}
+	*d = '\0';
+
+	return(dlen + (s - src));	/* count does not include NUL */
+}