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37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
# ungetc.m4 serial 1
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dnl Copyright (C) 2009 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN_ONCE([gl_FUNC_UNGETC_WORKS],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_CACHE_CHECK([whether ungetc works on arbitrary bytes],
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[gl_cv_func_ungetc_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <stdio.h>
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]], [FILE *f; long l;
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if (!(f = fopen ("conftest.tmp", "w+"))) return 1;
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if (fputs ("abc", f) < 0) return 2;
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rewind (f);
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if (fgetc (f) != 'a') return 3;
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if (fgetc (f) != 'b') return 4;
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if (ungetc ('d', f) != 'd') return 5;
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if (ftell (f) != 1) return 6;
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if (fgetc (f) != 'd') return 7;
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if (ftell (f) != 2) return 8;
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if (fseek (f, 0, SEEK_CUR) != 0) return 9;
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if (ftell (f) != 2) return 10;
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if (fgetc (f) != 'c') return 11;
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fclose (f); remove ("conftest.tmp");])],
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[gl_cv_func_ungetc_works=yes], [gl_cv_func_ungetc_works=no],
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[gl_cv_func_ungetc_works='guessing no'])
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])
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if test "$gl_cv_func_ungetc_works" != yes; then
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AC_DEFINE([FUNC_UNGETC_BROKEN], [1],
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[Define to 1 if ungetc is broken when used on arbitrary bytes.])
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fi
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])
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