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annotate m4/obstack-printf-posix.m4 @ 15308:a3ba680ad389

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strerror_r: fix OpenBSD behavior on 0 OpenBSD treats strerror_r(0,,) as a success, but with a message "Undefined error: 0"; while this is distinct from strerror_r(-1,,) returning "Unknown error: -1", it does not imply success. Meanwhile, if buf is short enough for ERANGE, then we can't use strstr to look for "Unknown" or "Undefined" in the resulting message, like we had been doing for strerror(). Fix this by shifting the burden - now the strerror-override code guarantees that 0 will have an override when needed. * lib/strerror-override.c (strerror_override): Also override 0 when needed. * lib/strerror-override.h (strerror_override): Likewise. * lib/strerror.c (strerror): Simplify, now that 0 override is done earlier. * lib/strerror_r.c (strerror_r): Likewise. * m4/strerror.m4 (gl_FUNC_STRERROR): Split detection of 0 behavior... (gl_FUNC_STRERROR_0): ...into new macro. * m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Replace strerror_r if 0 is overridden. (gl_FUNC_STRERROR_R_WORKS): Avoid extra tests if 0 is broken. * modules/strerror-override (Files): Add strerror.m4. (configure.ac): Also provide override for 0 when needed. * doc/posix-functions/strerror.texi (strerror): Document this. * doc/posix-functions/perror.texi (perror): Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 21 Jun 2011 08:50:51 -0600
parents 97fc9a21a8fb
children 8250f2777afc
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1 # obstack-printf-posix.m4 serial 4
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2 dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_OBSTACK_PRINTF_POSIX],
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8 [
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9 dnl Persuade glibc <stdio.h> to declare obstack_printf(), obstack_vprintf().
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10 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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11
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12 AC_REQUIRE([gl_PRINTF_SIZES_C99])
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13 AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
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14 AC_REQUIRE([gl_PRINTF_INFINITE])
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15 AC_REQUIRE([gl_PRINTF_INFINITE_LONG_DOUBLE])
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16 AC_REQUIRE([gl_PRINTF_DIRECTIVE_A])
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17 AC_REQUIRE([gl_PRINTF_DIRECTIVE_F])
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18 AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
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19 AC_REQUIRE([gl_PRINTF_DIRECTIVE_LS])
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20 AC_REQUIRE([gl_PRINTF_POSITIONS])
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21 AC_REQUIRE([gl_PRINTF_FLAG_GROUPING])
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22 AC_REQUIRE([gl_PRINTF_FLAG_LEFTADJUST])
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23 AC_REQUIRE([gl_PRINTF_FLAG_ZERO])
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24 AC_REQUIRE([gl_PRINTF_PRECISION])
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25 AC_REQUIRE([gl_PRINTF_ENOMEM])
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26 gl_cv_func_obstack_printf_posix=no
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27 AC_CHECK_FUNCS_ONCE([obstack_printf])
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28 if test $ac_cv_func_obstack_printf = yes ; then
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29 case "$gl_cv_func_printf_sizes_c99" in
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30 *yes)
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31 case "$gl_cv_func_printf_long_double" in
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32 *yes)
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33 case "$gl_cv_func_printf_infinite" in
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34 *yes)
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35 case "$gl_cv_func_printf_infinite_long_double" in
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36 *yes)
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37 case "$gl_cv_func_printf_directive_a" in
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38 *yes)
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39 case "$gl_cv_func_printf_directive_f" in
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40 *yes)
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41 case "$gl_cv_func_printf_directive_n" in
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42 *yes)
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43 case "$gl_cv_func_printf_directive_ls" in
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44 *yes)
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45 case "$gl_cv_func_printf_positions" in
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46 *yes)
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47 case "$gl_cv_func_printf_flag_grouping" in
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48 *yes)
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49 case "$gl_cv_func_printf_flag_leftadjust" in
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50 *yes)
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51 case "$gl_cv_func_printf_flag_zero" in
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52 *yes)
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53 case "$gl_cv_func_printf_precision" in
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54 *yes)
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55 case "$gl_cv_func_printf_enomem" in
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56 *yes)
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57 # obstack_printf exists and is
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58 # already POSIX compliant.
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59 gl_cv_func_obstack_printf_posix=yes
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60 ;;
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61 esac
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62 ;;
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63 esac
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64 ;;
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65 esac
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66 ;;
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67 esac
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68 ;;
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69 esac
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70 ;;
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71 esac
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72 ;;
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73 esac
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74 ;;
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75 esac
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76 ;;
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77 esac
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78 ;;
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79 esac
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80 ;;
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81 esac
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82 ;;
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83 esac
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84 ;;
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85 esac
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86 ;;
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87 esac
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88 fi
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89 if test $gl_cv_func_obstack_printf_posix = no; then
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90 gl_PREREQ_VASNPRINTF_LONG_DOUBLE
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91 gl_PREREQ_VASNPRINTF_INFINITE_DOUBLE
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92 gl_PREREQ_VASNPRINTF_INFINITE_LONG_DOUBLE
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93 gl_PREREQ_VASNPRINTF_DIRECTIVE_A
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94 gl_PREREQ_VASNPRINTF_DIRECTIVE_F
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95 gl_PREREQ_VASNPRINTF_DIRECTIVE_LS
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96 gl_PREREQ_VASNPRINTF_FLAG_GROUPING
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97 gl_PREREQ_VASNPRINTF_FLAG_LEFTADJUST
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98 gl_PREREQ_VASNPRINTF_FLAG_ZERO
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99 gl_PREREQ_VASNPRINTF_PRECISION
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100 gl_PREREQ_VASNPRINTF_ENOMEM
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101 gl_REPLACE_VASNPRINTF
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102 gl_REPLACE_OBSTACK_PRINTF
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103 fi
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104 gl_DECL_OBSTACK_PRINTF
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105 ])