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annotate m4/getdelim.m4 @ 14434:7624b26aea3d

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sys_socket, netdb: Document problem with socklen_t. * doc/posix-headers/sys_socket.texi: Mention lack of socklen_t on some platforms. * doc/posix-headers/netdb.texi: Likewise.
author Bruno Haible <bruno@clisp.org>
date Sat, 19 Mar 2011 13:39:12 +0100
parents 97fc9a21a8fb
children 20685414cb63
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # getdelim.m4 serial 8
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2
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3 dnl Copyright (C) 2005-2007, 2009-2011 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
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15 dnl Persuade glibc <stdio.h> to declare getdelim().
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16 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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17
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18 AC_CHECK_DECLS_ONCE([getdelim])
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19
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20 AC_CHECK_FUNCS_ONCE([getdelim])
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21 if test $ac_cv_func_getdelim = yes; then
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22 dnl Found it in some library. Verify that it works.
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23 AC_CACHE_CHECK([for working getdelim function], [gl_cv_func_working_getdelim],
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24 [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
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25 AC_RUN_IFELSE([AC_LANG_SOURCE([[
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26 # include <stdio.h>
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27 # include <stdlib.h>
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28 # include <string.h>
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29 int main ()
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30 {
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31 FILE *in = fopen ("./conftest.data", "r");
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32 if (!in)
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33 return 1;
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34 {
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35 /* Test result for a NULL buffer and a zero size.
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36 Based on a test program from Karl Heuer. */
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37 char *line = NULL;
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38 size_t siz = 0;
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39 int len = getdelim (&line, &siz, '\n', in);
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40 if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
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41 return 2;
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42 }
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43 {
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44 /* Test result for a NULL buffer and a non-zero size.
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45 This crashes on FreeBSD 8.0. */
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46 char *line = NULL;
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47 size_t siz = (size_t)(~0) / 4;
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48 if (getdelim (&line, &siz, '\n', in) == -1)
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49 return 3;
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50 }
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51 return 0;
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52 }
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53 ]])], [gl_cv_func_working_getdelim=yes] dnl The library version works.
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54 , [gl_cv_func_working_getdelim=no] dnl The library version does NOT work.
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55 , dnl We're cross compiling. Assume it works on glibc2 systems.
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56 [AC_EGREP_CPP([Lucky GNU user],
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57 [
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58 #include <features.h>
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59 #ifdef __GNU_LIBRARY__
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60 #if (__GLIBC__ >= 2) && !defined __UCLIBC__
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61 Lucky GNU user
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62 #endif
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63 #endif
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64 ],
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65 [gl_cv_func_working_getdelim=yes],
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66 [gl_cv_func_working_getdelim=no])]
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67 )])
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68 else
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69 gl_cv_func_working_getdelim=no
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70 fi
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71
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72 if test $ac_cv_have_decl_getdelim = no; then
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73 HAVE_DECL_GETDELIM=0
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74 fi
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75
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76 if test $gl_cv_func_working_getdelim = no; then
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77 if test $ac_cv_func_getdelim = yes; then
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78 REPLACE_GETDELIM=1
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79 fi
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80 AC_LIBOBJ([getdelim])
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81 gl_PREREQ_GETDELIM
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82 fi
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83 ])
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84
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85 # Prerequisites of lib/getdelim.c.
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86 AC_DEFUN([gl_PREREQ_GETDELIM],
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87 [
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88 AC_CHECK_FUNCS([flockfile funlockfile])
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89 AC_CHECK_DECLS([getc_unlocked])
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90 ])