diff options
Diffstat (limited to 'm4/fpurge.m4')
| -rw-r--r-- | m4/fpurge.m4 | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/m4/fpurge.m4 b/m4/fpurge.m4 new file mode 100644 index 0000000..99d1fc4 --- /dev/null +++ b/m4/fpurge.m4 @@ -0,0 +1,62 @@ +# fpurge.m4 serial 8 +dnl Copyright (C) 2007, 2009-2018 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_FPURGE], +[ + AC_REQUIRE([gl_STDIO_H_DEFAULTS]) + AC_CHECK_FUNCS_ONCE([fpurge]) + AC_CHECK_FUNCS_ONCE([__fpurge]) + AC_CHECK_DECLS([fpurge], , , [[#include <stdio.h>]]) + if test "x$ac_cv_func_fpurge" = xyes; then + HAVE_FPURGE=1 + # Detect BSD bug. Only cygwin 1.7 is known to be immune. + AC_CACHE_CHECK([whether fpurge works], [gl_cv_func_fpurge_works], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdio.h> +]], + [FILE *f = fopen ("conftest.txt", "w+"); + if (!f) + return 1; + if (fputc ('a', f) != 'a') + { fclose (f); return 2; } + rewind (f); + if (fgetc (f) != 'a') + { fclose (f); return 3; } + if (fgetc (f) != EOF) + { fclose (f); return 4; } + if (fpurge (f) != 0) + { fclose (f); return 5; } + if (putc ('b', f) != 'b') + { fclose (f); return 6; } + if (fclose (f) != 0) + return 7; + if ((f = fopen ("conftest.txt", "r")) == NULL) + return 8; + if (fgetc (f) != 'a') + { fclose (f); return 9; } + if (fgetc (f) != 'b') + { fclose (f); return 10; } + if (fgetc (f) != EOF) + { fclose (f); return 11; } + if (fclose (f) != 0) + return 12; + if (remove ("conftest.txt") != 0) + return 13; + return 0; + ])], + [gl_cv_func_fpurge_works=yes], [gl_cv_func_fpurge_works=no], + [gl_cv_func_fpurge_works='guessing no'])]) + if test "x$gl_cv_func_fpurge_works" != xyes; then + REPLACE_FPURGE=1 + fi + else + HAVE_FPURGE=0 + fi + if test "x$ac_cv_have_decl_fpurge" = xno; then + HAVE_DECL_FPURGE=0 + fi +]) |