Add strlcat() from OpenBSD, to be used for replacing strncat and other

strange coding practices.

6 files changed, 141 insertions, 4 deletions

diff --git a/configure b/configure
index 87eeef3823..43b31ad904 100755
--- a/configure
+++ b/configure
@@ -13973,6 +13973,76 @@ _ACEOF
 fi
 
 
+echo "$as_me:$LINENO: checking whether strlcat is declared" >&5
+echo $ECHO_N "checking whether strlcat is declared... $ECHO_C" >&6
+if test "${ac_cv_have_decl_strlcat+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+int
+main ()
+{
+#ifndef strlcat
+  char *p = (char *) strlcat;
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_have_decl_strlcat=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_have_decl_strlcat=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: $ac_cv_have_decl_strlcat" >&5
+echo "${ECHO_T}$ac_cv_have_decl_strlcat" >&6
+if test $ac_cv_have_decl_strlcat = yes; then
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_STRLCAT 1
+_ACEOF
+
+
+else
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_STRLCAT 0
+_ACEOF
+
+
+fi
 echo "$as_me:$LINENO: checking whether strlcpy is declared" >&5
 echo $ECHO_N "checking whether strlcpy is declared... $ECHO_C" >&6
 if test "${ac_cv_have_decl_strlcpy+set}" = set; then
@@ -14850,7 +14920,8 @@ LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
 
 
 
-for ac_func in crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strlcpy strtol strtoul unsetenv
+
+for ac_func in crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strlcat strlcpy strtol strtoul unsetenv
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5
diff --git a/configure.in b/configure.in
index d5386cc030..906db45c9b 100644
--- a/configure.in
+++ b/configure.in
@@ -905,7 +905,7 @@ AC_CHECK_FUNCS([cbrt dlopen fcvt fdatasync getpeereid getrlimit memmove poll pst
 
 AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
 AC_CHECK_DECLS(posix_fadvise, [], [], [#include <fcntl.h>])
-AC_CHECK_DECLS(strlcpy)
+AC_CHECK_DECLS([strlcat, strlcpy])
 # This is probably only present on Darwin, but may as well check always
 AC_CHECK_DECLS(F_FULLFSYNC, [], [], [#include <fcntl.h>])
 
@@ -1002,7 +1002,7 @@ fi
 pgac_save_LIBS="$LIBS"
 LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
 
-AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strlcpy strtol strtoul unsetenv])
+AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strlcat strlcpy strtol strtoul unsetenv])
 
 LIBS="$pgac_save_LIBS"
 
diff --git a/src/bin/pg_config/pg_config.c b/src/bin/pg_config/pg_config.c
index d55b097a3a..e95cb23de0 100644
--- a/src/bin/pg_config/pg_config.c
+++ b/src/bin/pg_config/pg_config.c
@@ -213,7 +213,7 @@ show_pgxs(bool all)
 	if (all)
 		printf("PGXS = ");
 	get_pkglib_path(mypath, path);
-	strncat(path, "/pgxs/src/makefiles/pgxs.mk", MAXPGPATH - 1 - strlen(path));
+	strlcat(path, "/pgxs/src/makefiles/pgxs.mk", sizeof(path));
 	cleanup_path(path);
 	printf("%s\n", path);
 }
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 8d48c9cbc7..71b8d0e7d2 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -87,6 +87,10 @@
    don't. */
 #undef HAVE_DECL_SNPRINTF
 
+/* Define to 1 if you have the declaration of `strlcat', and to 0 if you
+   don't. */
+#undef HAVE_DECL_STRLCAT
+
 /* Define to 1 if you have the declaration of `strlcpy', and to 0 if you
    don't. */
 #undef HAVE_DECL_STRLCPY
@@ -389,6 +393,9 @@
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
+/* Define to 1 if you have the `strlcat' function. */
+#undef HAVE_STRLCAT
+
 /* Define to 1 if you have the `strlcpy' function. */
 #undef HAVE_STRLCPY
 
diff --git a/src/include/port.h b/src/include/port.h
index 772de12eb8..fbce02aa67 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -343,6 +343,10 @@ extern int	inet_aton(const char *cp, struct in_addr * addr);
 extern char *strdup(const char *str);
 #endif
 
+#if !HAVE_DECL_STRLCAT
+extern size_t strlcat(char *dst, const char *src, size_t siz);
+#endif
+
 #if !HAVE_DECL_STRLCPY
 extern size_t strlcpy(char *dst, const char *src, size_t siz);
 #endif
diff --git a/src/port/strlcat.c b/src/port/strlcat.c
new file mode 100644
index 0000000000..8e0ad3c42d
--- /dev/null
+++ b/src/port/strlcat.c
@@ -0,0 +1,55 @@
+/*	$OpenBSD$	*/
+
+/*
+ * Copyright (c) 1998 Todd C. Miller <[email protected]>
+ *
+ * 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 "c.h"
+
+
+/*
+ * 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
+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 */
+}