| # getline.m4 serial 30 |
| |
| dnl Copyright (C) 1998-2003, 2005-2007, 2009-2021 Free Software Foundation, |
| dnl Inc. |
| dnl |
| 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_PREREQ([2.59]) |
| |
| dnl See if there's a working, system-supplied version of the getline function. |
| dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems |
| dnl have a function by that name in -linet that doesn't have anything |
| dnl to do with the function we need. |
| AC_DEFUN([gl_FUNC_GETLINE], |
| [ |
| AC_REQUIRE([gl_STDIO_H_DEFAULTS]) |
| AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| |
| dnl Persuade glibc <stdio.h> to declare getline(). |
| AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| |
| AC_CHECK_DECLS_ONCE([getline]) |
| |
| gl_getline_needs_run_time_check=no |
| AC_CHECK_FUNC([getline], |
| [dnl Found it in some library. Verify that it works. |
| gl_getline_needs_run_time_check=yes], |
| [am_cv_func_working_getline=no]) |
| if test $gl_getline_needs_run_time_check = yes; then |
| AC_CACHE_CHECK([for working getline function], |
| [am_cv_func_working_getline], |
| [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data |
| AC_RUN_IFELSE([AC_LANG_SOURCE([[ |
| # include <stdio.h> |
| # include <stdlib.h> |
| # include <string.h> |
| int main () |
| { |
| FILE *in = fopen ("./conftest.data", "r"); |
| if (!in) |
| return 1; |
| { |
| /* Test result for a NULL buffer and a zero size. |
| Based on a test program from Karl Heuer. */ |
| char *line = NULL; |
| size_t siz = 0; |
| int len = getline (&line, &siz, in); |
| if (!(len == 4 && line && strcmp (line, "foo\n") == 0)) |
| { free (line); fclose (in); return 2; } |
| free (line); |
| } |
| { |
| /* Test result for a NULL buffer and a non-zero size. |
| This crashes on FreeBSD 8.0. */ |
| char *line = NULL; |
| size_t siz = (size_t)(~0) / 4; |
| if (getline (&line, &siz, in) == -1) |
| { fclose (in); return 3; } |
| free (line); |
| } |
| fclose (in); |
| return 0; |
| } |
| ]])], |
| [am_cv_func_working_getline=yes], |
| [am_cv_func_working_getline=no], |
| [dnl We're cross compiling. |
| dnl Guess it works on glibc2 systems and musl systems. |
| AC_EGREP_CPP([Lucky GNU user], |
| [ |
| #include <features.h> |
| #ifdef __GNU_LIBRARY__ |
| #if (__GLIBC__ >= 2) && !defined __UCLIBC__ |
| Lucky GNU user |
| #endif |
| #endif |
| ], |
| [am_cv_func_working_getline="guessing yes"], |
| [case "$host_os" in |
| *-musl*) am_cv_func_working_getline="guessing yes" ;; |
| *) am_cv_func_working_getline="$gl_cross_guess_normal" ;; |
| esac |
| ]) |
| ]) |
| ]) |
| fi |
| |
| if test $ac_cv_have_decl_getline = no; then |
| HAVE_DECL_GETLINE=0 |
| fi |
| |
| case "$am_cv_func_working_getline" in |
| *yes) ;; |
| *) |
| dnl Set REPLACE_GETLINE always: Even if we have not found the broken |
| dnl getline function among $LIBS, it may exist in libinet and the |
| dnl executable may be linked with -linet. |
| REPLACE_GETLINE=1 |
| ;; |
| esac |
| ]) |
| |
| # Prerequisites of lib/getline.c. |
| AC_DEFUN([gl_PREREQ_GETLINE], |
| [ |
| : |
| ]) |