| 1 | # getdelim.m4 serial 16
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| 2 |
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| 3 | dnl Copyright (C) 2005-2007, 2009-2022 Free Software Foundation, Inc.
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| 4 | dnl
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| 5 | dnl This file is free software; the Free Software Foundation
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| 6 | dnl gives unlimited permission to copy and/or distribute it,
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| 7 | dnl with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | AC_PREREQ([2.59])
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| 10 |
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| 11 | AC_DEFUN([gl_FUNC_GETDELIM],
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| 12 | [
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| 13 | AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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| 14 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 15 |
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| 16 | dnl Persuade glibc <stdio.h> to declare getdelim().
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| 17 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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| 18 |
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| 19 | AC_CHECK_DECLS_ONCE([getdelim])
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| 20 |
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| 21 | AC_CHECK_FUNCS_ONCE([getdelim])
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| 22 | if test $ac_cv_func_getdelim = yes; then
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| 23 | HAVE_GETDELIM=1
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| 24 | dnl Found it in some library. Verify that it works.
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| 25 | AC_CACHE_CHECK([for working getdelim function],
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| 26 | [gl_cv_func_working_getdelim],
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| 27 | [case "$host_os" in
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| 28 | darwin*)
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| 29 | dnl On macOS 10.13, valgrind detected an out-of-bounds read during
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| 30 | dnl the GNU sed test suite:
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| 31 | dnl Invalid read of size 16
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| 32 | dnl at 0x100EE6A05: _platform_memchr$VARIANT$Base (in /usr/lib/system/libsystem_platform.dylib)
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| 33 | dnl by 0x100B7B0BD: getdelim (in /usr/lib/system/libsystem_c.dylib)
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| 34 | dnl by 0x10000B0BE: ck_getdelim (utils.c:254)
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| 35 | gl_cv_func_working_getdelim=no ;;
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| 36 | *)
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| 37 | echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
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| 38 | AC_RUN_IFELSE([AC_LANG_SOURCE([[
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| 39 | # include <stdio.h>
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| 40 | # include <stdlib.h>
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| 41 | # include <string.h>
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| 42 | int main ()
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| 43 | {
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| 44 | FILE *in = fopen ("./conftest.data", "r");
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| 45 | if (!in)
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| 46 | return 1;
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| 47 | {
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| 48 | /* Test result for a NULL buffer and a zero size.
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| 49 | Based on a test program from Karl Heuer. */
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| 50 | char *line = NULL;
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| 51 | size_t siz = 0;
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| 52 | int len = getdelim (&line, &siz, '\n', in);
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| 53 | if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
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| 54 | { free (line); fclose (in); return 2; }
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| 55 | free (line);
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| 56 | }
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| 57 | {
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| 58 | /* Test result for a NULL buffer and a non-zero size.
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| 59 | This crashes on FreeBSD 8.0. */
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| 60 | char *line = NULL;
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| 61 | size_t siz = (size_t)(~0) / 4;
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| 62 | if (getdelim (&line, &siz, '\n', in) == -1)
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| 63 | { fclose (in); return 3; }
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| 64 | free (line);
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| 65 | }
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| 66 | fclose (in);
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| 67 | return 0;
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| 68 | }
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| 69 | ]])],
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| 70 | [gl_cv_func_working_getdelim=yes],
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| 71 | [gl_cv_func_working_getdelim=no],
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| 72 | [dnl We're cross compiling.
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| 73 | dnl Guess it works on glibc2 systems and musl systems.
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| 74 | AC_EGREP_CPP([Lucky GNU user],
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| 75 | [
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| 76 | #include <features.h>
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| 77 | #ifdef __GNU_LIBRARY__
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| 78 | #if (__GLIBC__ >= 2) && !defined __UCLIBC__
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| 79 | Lucky GNU user
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| 80 | #endif
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| 81 | #endif
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| 82 | ],
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| 83 | [gl_cv_func_working_getdelim="guessing yes"],
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| 84 | [case "$host_os" in
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| 85 | *-musl*) gl_cv_func_working_getdelim="guessing yes" ;;
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| 86 | *) gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
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| 87 | esac
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| 88 | ])
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| 89 | ])
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| 90 | ;;
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| 91 | esac
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| 92 | ])
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| 93 | case "$gl_cv_func_working_getdelim" in
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| 94 | *yes) ;;
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| 95 | *) REPLACE_GETDELIM=1 ;;
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| 96 | esac
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| 97 | else
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| 98 | HAVE_GETDELIM=0
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| 99 | fi
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| 100 |
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| 101 | if test $ac_cv_have_decl_getdelim = no; then
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| 102 | HAVE_DECL_GETDELIM=0
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| 103 | fi
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| 104 | ])
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| 105 |
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| 106 | # Prerequisites of lib/getdelim.c.
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| 107 | AC_DEFUN([gl_PREREQ_GETDELIM],
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| 108 | [
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| 109 | AC_CHECK_FUNCS([flockfile funlockfile])
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| 110 | AC_CHECK_DECLS([getc_unlocked])
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| 111 | ])
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