mandoc: Test availability of mkstemps(3) and provide a fallback

mandoc: Test availability of mkstemps(3) and provide a fallback

[schwarze]

Log Message:
-----------
Test availability of mkstemps(3) and provide a fallback implementation
in case it is missing; needed for SUN Solaris 10.

Modified Files:
--------------
    mandoc:
        Makefile
        Makefile.depend
        configure

Added Files:
-----------
    mandoc:
        compat_mkstemps.c
        test-mkstemps.c

Revision Data
-------------
Index: Makefile.depend
===================================================================
RCS file: /home/cvs/mandoc/mandoc/Makefile.depend,v
retrieving revision 1.50
retrieving revision 1.51
diff -LMakefile.depend -LMakefile.depend -u -p -r1.50 -r1.51
--- Makefile.depend
+++ Makefile.depend
@@ -9,6 +9,7 @@ compat_getline.o: compat_getline.c confi
 compat_getsubopt.o: compat_getsubopt.c config.h
 compat_isblank.o: compat_isblank.c config.h
 compat_mkdtemp.o: compat_mkdtemp.c config.h
+compat_mkstemps.o: compat_mkstemps.c config.h
 compat_ohash.o: compat_ohash.c config.h compat_ohash.h
 compat_progname.o: compat_progname.c config.h
 compat_reallocarray.o: compat_reallocarray.c config.h
Index: Makefile
===================================================================
RCS file: /home/cvs/mandoc/mandoc/Makefile,v
retrieving revision 1.536
retrieving revision 1.537
diff -LMakefile -LMakefile -u -p -r1.536 -r1.537
--- Makefile
+++ Makefile
@@ -1,6 +1,6 @@
 # $Id$
 #
-# Copyright (c) 2011, 2013-2020 Ingo Schwarze <schwarze@openbsd.org>
+# Copyright (c) 2011, 2013-2021 Ingo Schwarze <schwarze@openbsd.org>
 # Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 #
 # Permission to use, copy, modify, and distribute this software for any
@@ -30,6 +30,7 @@ TESTSRCS	 = test-attribute.c \
 		   test-getsubopt.c \
 		   test-isblank.c \
 		   test-mkdtemp.c \
+		   test-mkstemps.c \
 		   test-nanosleep.c \
 		   test-noop.c \
 		   test-ntohl.c \
@@ -66,6 +67,7 @@ SRCS		 = arch.c \
 		   compat_getsubopt.c \
 		   compat_isblank.c \
 		   compat_mkdtemp.c \
+		   compat_mkstemps.c \
 		   compat_ohash.c \
 		   compat_progname.c \
 		   compat_reallocarray.c \
@@ -257,6 +259,7 @@ ALL_COBJS	 = compat_err.o \
 		   compat_getsubopt.o \
 		   compat_isblank.o \
 		   compat_mkdtemp.o \
+		   compat_mkstemps.o \
 		   compat_ohash.o \
 		   compat_progname.o \
 		   compat_reallocarray.o \
Index: configure
===================================================================
RCS file: /home/cvs/mandoc/mandoc/configure,v
retrieving revision 1.79
retrieving revision 1.80
diff -Lconfigure -Lconfigure -u -p -r1.79 -r1.80
--- configure
+++ configure
@@ -2,7 +2,7 @@
 #
 # $Id$
 #
-# Copyright (c) 2014-2020 Ingo Schwarze <schwarze@openbsd.org>
+# Copyright (c) 2014-2021 Ingo Schwarze <schwarze@openbsd.org>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
@@ -68,6 +68,7 @@ HAVE_GETSUBOPT=
 HAVE_ISBLANK=
 HAVE_LESS_T=
 HAVE_MKDTEMP=
+HAVE_MKSTEMPS=
 HAVE_NANOSLEEP=
 HAVE_NTOHL=
 HAVE_O_DIRECTORY=
@@ -307,6 +308,7 @@ runtest getline		GETLINE		|| true
 runtest getsubopt	GETSUBOPT	"" -D_GNU_SOURCE || true
 runtest isblank		ISBLANK		|| true
 runtest mkdtemp		MKDTEMP		|| true
+runtest mkstemps	MKSTEMPS	|| true
 runtest nanosleep	NANOSLEEP	"${LD_NANOSLEEP}" "-lrt" || true
 runtest ntohl		NTOHL		|| true
 runtest O_DIRECTORY	O_DIRECTORY	|| true
@@ -483,6 +485,7 @@ cat << __HEREDOC__
 #define HAVE_ISBLANK ${HAVE_ISBLANK}
 #define HAVE_LESS_T ${HAVE_LESS_T}
 #define HAVE_MKDTEMP ${HAVE_MKDTEMP}
+#define HAVE_MKSTEMPS ${HAVE_MKSTEMPS}
 #define HAVE_NTOHL ${HAVE_NTOHL}
 #define HAVE_PLEDGE ${HAVE_PLEDGE}
 #define HAVE_PROGNAME ${HAVE_PROGNAME}
@@ -542,6 +545,10 @@ fi
 if [ ${HAVE_MKDTEMP} -eq 0 ]; then
 	echo "extern	char	 *mkdtemp(char *);"
 	MANDOC_COBJS="${MANDOC_COBJS} compat_mkdtemp.o"
+fi
+if [ ${HAVE_MKSTEMPS} -eq 0 ]; then
+	echo "extern	int	  mkstemps(char *, int);"
+	MANDOC_COBJS="${MANDOC_COBJS} compat_mkstemps.o"
 fi
 if [ ${HAVE_OHASH} -eq 0 ]; then
 	MANDOC_COBJS="${MANDOC_COBJS} compat_ohash.o"
--- /dev/null
+++ test-mkstemps.c
@@ -0,0 +1,12 @@
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(void)
+{
+	char	filename[] = "/tmp/temp.XXXXXX.suffix";
+
+	if (mkstemps(filename, 7) == -1)
+		return 1;
+	return unlink(filename) == -1;
+}
--- /dev/null
+++ compat_mkstemps.c
@@ -0,0 +1,63 @@
+/* $Id: compat_mkstemps.c,v 1.1 2021/09/19 15:05:39 schwarze Exp $ */
+/*
+ * Copyright (c) 2015, 2021 Ingo Schwarze <schwarze@openbsd.org>
+ *
+ * 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.
+ *
+ * Parts of the algorithm of this function are inspired by OpenBSD
+ * mkdtemp(3) by Theo de Raadt and Todd Miller, but the code differs.
+ */
+#include "config.h"
+
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+int
+mkstemps(char *path, int suffixlen)
+{
+	char	*start, *end, *cp;
+	int	 fd, tries;
+	char	 backup;
+
+	end = strchr(path, '\0');
+	if (suffixlen < 0 || suffixlen > end - path - 6) {
+		errno = EINVAL;
+		return -1;
+	}
+	end -= suffixlen;
+	for (start = end; start > path; start--)
+		if (start[-1] != 'X')
+			break;
+
+	backup = *end;
+	for (tries = INT_MAX; tries; tries--) {
+		*end = '\0';
+		cp = mktemp(path);
+		*end = backup;
+		if (cp == NULL)
+			return -1;
+		fd = open(path, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR);
+		if (fd != -1)
+			return fd;
+		for (cp = start; cp < end; cp++)
+			*cp = 'X';
+		if (errno != EEXIST)
+			return -1;
+	}
+	errno = EEXIST;
+	return -1;
+}
--
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