109 lines
3.2 KiB
Text
109 lines
3.2 KiB
Text
# getline.m4 serial 30
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dnl Copyright (C) 1998-2003, 2005-2007, 2009-2023 Free Software Foundation,
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dnl Inc.
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dnl
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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_PREREQ([2.59])
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dnl See if there's a working, system-supplied version of the getline function.
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dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
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dnl have a function by that name in -linet that doesn't have anything
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dnl to do with the function we need.
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AC_DEFUN([gl_FUNC_GETLINE],
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[
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AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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dnl Persuade glibc <stdio.h> to declare getline().
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_DECLS_ONCE([getline])
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gl_getline_needs_run_time_check=no
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AC_CHECK_FUNC([getline],
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[dnl Found it in some library. Verify that it works.
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gl_getline_needs_run_time_check=yes],
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[am_cv_func_working_getline=no])
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if test $gl_getline_needs_run_time_check = yes; then
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AC_CACHE_CHECK([for working getline function],
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[am_cv_func_working_getline],
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[echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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int main ()
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{
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FILE *in = fopen ("./conftest.data", "r");
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if (!in)
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return 1;
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{
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/* Test result for a NULL buffer and a zero size.
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Based on a test program from Karl Heuer. */
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char *line = NULL;
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size_t siz = 0;
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int len = getline (&line, &siz, in);
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if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
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{ free (line); fclose (in); return 2; }
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free (line);
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}
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{
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/* Test result for a NULL buffer and a non-zero size.
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This crashes on FreeBSD 8.0. */
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char *line = NULL;
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size_t siz = (size_t)(~0) / 4;
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if (getline (&line, &siz, in) == -1)
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{ fclose (in); return 3; }
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free (line);
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}
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fclose (in);
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return 0;
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}
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]])],
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[am_cv_func_working_getline=yes],
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[am_cv_func_working_getline=no],
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[dnl We're cross compiling.
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dnl Guess it works on glibc2 systems and musl systems.
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AC_EGREP_CPP([Lucky GNU user],
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[
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#include <features.h>
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#ifdef __GNU_LIBRARY__
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#if (__GLIBC__ >= 2) && !defined __UCLIBC__
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Lucky GNU user
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#endif
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#endif
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],
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[am_cv_func_working_getline="guessing yes"],
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[case "$host_os" in
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*-musl*) am_cv_func_working_getline="guessing yes" ;;
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*) am_cv_func_working_getline="$gl_cross_guess_normal" ;;
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esac
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])
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])
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])
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fi
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if test $ac_cv_have_decl_getline = no; then
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HAVE_DECL_GETLINE=0
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fi
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case "$am_cv_func_working_getline" in
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*yes) ;;
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*)
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dnl Set REPLACE_GETLINE always: Even if we have not found the broken
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dnl getline function among $LIBS, it may exist in libinet and the
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dnl executable may be linked with -linet.
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REPLACE_GETLINE=1
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;;
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esac
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])
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# Prerequisites of lib/getline.c.
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AC_DEFUN([gl_PREREQ_GETLINE],
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[
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:
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])
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