1# getline.m4 serial 30 2 3dnl Copyright (C) 1998-2003, 2005-2007, 2009-2022 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 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles 20 21 dnl Persuade glibc <stdio.h> to declare getline(). 22 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 23 24 AC_CHECK_DECLS_ONCE([getline]) 25 26 gl_getline_needs_run_time_check=no 27 AC_CHECK_FUNC([getline], 28 [dnl Found it in some library. Verify that it works. 29 gl_getline_needs_run_time_check=yes], 30 [am_cv_func_working_getline=no]) 31 if test $gl_getline_needs_run_time_check = yes; then 32 AC_CACHE_CHECK([for working getline function], 33 [am_cv_func_working_getline], 34 [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data 35 AC_RUN_IFELSE([AC_LANG_SOURCE([[ 36# include <stdio.h> 37# include <stdlib.h> 38# include <string.h> 39 int main () 40 { 41 FILE *in = fopen ("./conftest.data", "r"); 42 if (!in) 43 return 1; 44 { 45 /* Test result for a NULL buffer and a zero size. 46 Based on a test program from Karl Heuer. */ 47 char *line = NULL; 48 size_t siz = 0; 49 int len = getline (&line, &siz, in); 50 if (!(len == 4 && line && strcmp (line, "foo\n") == 0)) 51 { free (line); fclose (in); return 2; } 52 free (line); 53 } 54 { 55 /* Test result for a NULL buffer and a non-zero size. 56 This crashes on FreeBSD 8.0. */ 57 char *line = NULL; 58 size_t siz = (size_t)(~0) / 4; 59 if (getline (&line, &siz, in) == -1) 60 { fclose (in); return 3; } 61 free (line); 62 } 63 fclose (in); 64 return 0; 65 } 66 ]])], 67 [am_cv_func_working_getline=yes], 68 [am_cv_func_working_getline=no], 69 [dnl We're cross compiling. 70 dnl Guess it works on glibc2 systems and musl systems. 71 AC_EGREP_CPP([Lucky GNU user], 72 [ 73#include <features.h> 74#ifdef __GNU_LIBRARY__ 75 #if (__GLIBC__ >= 2) && !defined __UCLIBC__ 76 Lucky GNU user 77 #endif 78#endif 79 ], 80 [am_cv_func_working_getline="guessing yes"], 81 [case "$host_os" in 82 *-musl*) am_cv_func_working_getline="guessing yes" ;; 83 *) am_cv_func_working_getline="$gl_cross_guess_normal" ;; 84 esac 85 ]) 86 ]) 87 ]) 88 fi 89 90 if test $ac_cv_have_decl_getline = no; then 91 HAVE_DECL_GETLINE=0 92 fi 93 94 case "$am_cv_func_working_getline" in 95 *yes) ;; 96 *) 97 dnl Set REPLACE_GETLINE always: Even if we have not found the broken 98 dnl getline function among $LIBS, it may exist in libinet and the 99 dnl executable may be linked with -linet. 100 REPLACE_GETLINE=1 101 ;; 102 esac 103]) 104 105# Prerequisites of lib/getline.c. 106AC_DEFUN([gl_PREREQ_GETLINE], 107[ 108 : 109]) 110