-dnl CF_CPP_VSCAN_FUNC version: 5 updated: 2001/12/02 01:39:28
-dnl -----------------
-dnl Check if the g++ compiler supports vscan function (not a standard feature).
-AC_DEFUN([CF_CPP_VSCAN_FUNC],
-[
-if test -n "$CXX"; then
-
-AC_LANG_SAVE
-AC_LANG_CPLUSPLUS
-AC_CHECK_HEADERS(strstream.h)
-
-AC_CACHE_CHECK(if $CXX supports vscan function,cf_cv_cpp_vscan_func,[
- for cf_vscan_func in strstream strstream_cast stdio
- do
- case $cf_vscan_func in #(vi
- stdio) cf_vscan_defs=USE_STDIO_VSCAN ;; #(vi
- strstream) cf_vscan_defs=USE_STRSTREAM_VSCAN ;;
- strstream_cast) cf_vscan_defs=USE_STRSTREAM_VSCAN_CAST ;;
- esac
- AC_TRY_LINK([
-#include <stdio.h>
-#include <stdarg.h>
-#define $cf_vscan_defs 1
-#if defined(USE_STDIO_VSCAN)
-#elif defined(HAVE_STRSTREAM_H) && defined(USE_STRSTREAM_VSCAN)
-#include <strstream.h>
-#endif
-
-int scanw(const char* fmt, ...)
-{
- int result = -1;
- char buf[BUFSIZ];
-
- va_list args;
- va_start(args, fmt);
-#if defined(USE_STDIO_VSCAN)
- if (::vsscanf(buf, fmt, args) != -1)
- result = 0;
-#elif defined(USE_STRSTREAM_VSCAN)
- strstreambuf ss(buf, sizeof(buf));
- if (ss.vscan(fmt, args) != -1)
- result = 0;
-#elif defined(USE_STRSTREAM_VSCAN_CAST)
- strstreambuf ss(buf, sizeof(buf));
- if (ss.vscan(fmt, (_IO_va_list)args) != -1)
- result = 0;
-#else
-#error case $cf_vscan_func failed
-#endif
- va_end(args);
- return result;
-}
-],[int tmp, foo = scanw("%d", &tmp)],
- [cf_cv_cpp_vscan_func=$cf_vscan_func; break],
- [cf_cv_cpp_vscan_func=no])
- test "$cf_cv_cpp_vscan_func" != no && break
- done
-])
-
-AC_LANG_RESTORE
-fi
-
-case $cf_cv_cpp_vscan_func in #(vi
-stdio) #(vi
- AC_DEFINE(CPP_HAS_VSCAN_FUNC)
- AC_DEFINE(USE_STDIO_VSCAN)
- ;;
-strstream)
- AC_DEFINE(CPP_HAS_VSCAN_FUNC)
- AC_DEFINE(USE_STRSTREAM_VSCAN)
- ;;
-strstream_cast)
- AC_DEFINE(CPP_HAS_VSCAN_FUNC)
- AC_DEFINE(USE_STRSTREAM_VSCAN_CAST)
- ;;
-esac
-])dnl
-dnl ---------------------------------------------------------------------------
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