Adding ftw function.

* Makefile (ftw.o): Add to OBJS-y conditionally.

* configure (have_ftw): New variable. New configure test
for nftw.
(gen_config_make): Set up have_ftw make variable.

* ftw.c, ftw.h: New files.

* lib.c (init): Call ftw_init, if compiled in.

* txr.1: Documented.

1 files changed, 39 insertions, 0 deletions

diff --git a/configure b/configure
index 28b6988a..4d84d8ad 100755
--- a/configure
+++ b/configure
@@ -125,6 +125,7 @@ have_unistd=
 have_sys_time=
 have_syslog=
 have_glob=
+have_ftw=
 have_windows_h=
 have_windres=
 have_posix_sigs=
@@ -660,6 +661,9 @@ have_syslog := $have_syslog
 # do we compile in glob support?
 have_glob := $have_glob
 
+# do we compile in ftwsupport?
+have_ftw := $have_ftw
+
 # do we modern posix signal handling?
 have_posix_sigs := $have_posix_sigs
 
@@ -2096,6 +2100,41 @@ else
   printf "no\n"
 fi
 
+printf "Checking for nftw ... "
+
+cat > conftest.c <<!
+#include <ftw.h>
+#include <stdlib.h>
+
+static int callback(const char *fpath, const struct stat *sb,
+                    int tflag, struct FTW *ftwbuf)
+{
+   switch (tflag) {
+   case FTW_D:
+   case FTW_DP:
+   case FTW_NS:
+   case FTW_SLN:
+     break;
+   }
+   return 0;
+}
+
+int main(int argc, char *argv[])
+{
+   int flags = FTW_DEPTH | FTW_PHYS;
+   int res = nftw(argv[1], callback, 20, flags);
+   return (res == -1) ? EXIT_FAILURE : 0;
+}
+!
+
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_FTW 1\n" >> $config_h
+  have_ftw=y
+else
+  printf "no\n"
+fi
+
 printf "Checking for windres ... "
 
 if output=$(windres -V 2> /dev/null) ; then