1# getline.m4 serial 27 2 3dnl Copyright (C) 1998-2003, 2005-2007, 2009-2016 Free Software Foundation, 4dnl Inc. 5dnl 6dnl This file is free software; the Free Software Foundation 7dnl gives unlimited permission to copy and/or distribute it, 8dnl with or without modifications, as long as this notice is preserved. 9 10AC_PREREQ([2.59]) 11 12dnl See if there's a working, system-supplied version of the getline function. 13dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems 14dnl have a function by that name in -linet that doesn't have anything 15dnl to do with the function we need. 16AC_DEFUN([gl_FUNC_GETLINE], 17[ 18 AC_REQUIRE([gl_STDIO_H_DEFAULTS]) 19 20 dnl Persuade glibc <stdio.h> to declare getline(). 21 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 22 23 AC_CHECK_DECLS_ONCE([getline]) 24 25 gl_getline_needs_run_time_check=no 26 AC_CHECK_FUNC([getline], 27 [dnl Found it in some library. Verify that it works. 28 gl_getline_needs_run_time_check=yes], 29 [am_cv_func_working_getline=no]) 30 if test $gl_getline_needs_run_time_check = yes; then 31 AC_CACHE_CHECK([for working getline function], [am_cv_func_working_getline], 32 [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data 33 AC_RUN_IFELSE([AC_LANG_SOURCE([[ 34# include <stdio.h> 35# include <stdlib.h> 36# include <string.h> 37 int main () 38 { 39 FILE *in = fopen ("./conftest.data", "r"); 40 if (!in) 41 return 1; 42 { 43 /* Test result for a NULL buffer and a zero size. 44 Based on a test program from Karl Heuer. */ 45 char *line = NULL; 46 size_t siz = 0; 47 int len = getline (&line, &siz, in); 48 if (!(len == 4 && line && strcmp (line, "foo\n") == 0)) 49 return 2; 50 free (line); 51 } 52 { 53 /* Test result for a NULL buffer and a non-zero size. 54 This crashes on FreeBSD 8.0. */ 55 char *line = NULL; 56 size_t siz = (size_t)(~0) / 4; 57 if (getline (&line, &siz, in) == -1) 58 return 3; 59 free (line); 60 } 61 fclose (in); 62 return 0; 63 } 64 ]])], [am_cv_func_working_getline=yes] dnl The library version works. 65 , [am_cv_func_working_getline=no] dnl The library version does NOT work. 66 , dnl We're cross compiling. Assume it works on glibc2 systems. 67 [AC_EGREP_CPP([Lucky GNU user], 68 [ 69#include <features.h> 70#ifdef __GNU_LIBRARY__ 71 #if (__GLIBC__ >= 2) && !defined __UCLIBC__ 72 Lucky GNU user 73 #endif 74#endif 75 ], 76 [am_cv_func_working_getline="guessing yes"], 77 [am_cv_func_working_getline="guessing no"])] 78 )]) 79 fi 80 81 if test $ac_cv_have_decl_getline = no; then 82 HAVE_DECL_GETLINE=0 83 fi 84 85 case "$am_cv_func_working_getline" in 86 *no) 87 dnl Set REPLACE_GETLINE always: Even if we have not found the broken 88 dnl getline function among $LIBS, it may exist in libinet and the 89 dnl executable may be linked with -linet. 90 REPLACE_GETLINE=1 91 ;; 92 esac 93]) 94 95# Prerequisites of lib/getline.c. 96AC_DEFUN([gl_PREREQ_GETLINE], 97[ 98 : 99]) 100