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annotate m4/snprintf-posix.m4 @ 8763:39bb5430fc0e

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Guard against vsnprintf implementations that mishandle a size=0 argument.
author Bruno Haible <bruno@clisp.org>
date Sun, 29 Apr 2007 15:40:30 +0000
parents 40c507f55b0f
children 6c1d98929550
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1 # snprintf-posix.m4 serial 4
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2 dnl Copyright (C) 2007 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_SNPRINTF_POSIX],
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8 [
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9 AC_REQUIRE([gl_EOVERFLOW])
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10 AC_REQUIRE([gl_PRINTF_SIZES_C99])
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11 AC_REQUIRE([gl_PRINTF_DIRECTIVE_A])
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12 AC_REQUIRE([gl_PRINTF_DIRECTIVE_F])
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13 AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
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14 AC_REQUIRE([gl_PRINTF_POSITIONS])
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15 gl_cv_func_snprintf_posix=no
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16 AC_CHECK_FUNCS([snprintf])
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17 if test $ac_cv_func_snprintf = yes; then
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18 gl_SNPRINTF_TRUNCATION_C99
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19 gl_SNPRINTF_RETVAL_C99
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20 gl_SNPRINTF_DIRECTIVE_N
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21 gl_VSNPRINTF_ZEROSIZE_C99
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22 case "$gl_cv_func_printf_sizes_c99" in
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23 *yes)
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24 case "$gl_cv_func_printf_directive_a" in
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25 *yes)
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26 case "$gl_cv_func_printf_directive_f" in
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27 *yes)
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28 case "$gl_cv_func_printf_directive_n" in
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29 *yes)
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30 case "$gl_cv_func_printf_positions" in
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31 *yes)
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32 case "$gl_cv_func_snprintf_truncation_c99" in
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33 *yes)
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34 case "$gl_cv_func_snprintf_retval_c99" in
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35 *yes)
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36 case "$gl_cv_func_snprintf_directive_n" in
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37 *yes)
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38 case "$gl_cv_func_vsnprintf_zerosize_c99" in
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39 *yes)
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40 # snprintf exists and is already POSIX
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41 # compliant.
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42 gl_cv_func_snprintf_posix=yes
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43 ;;
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44 esac
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45 ;;
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46 esac
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47 ;;
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48 esac
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49 ;;
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50 esac
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51 ;;
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52 esac
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53 ;;
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54 esac
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55 ;;
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56 esac
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57 ;;
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58 esac
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59 ;;
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60 esac
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61 fi
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62 if test $gl_cv_func_snprintf_posix = no; then
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63 gl_PREREQ_VASNPRINTF_DIRECTIVE_A
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64 gl_PREREQ_VASNPRINTF_DIRECTIVE_F
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65 gl_REPLACE_VASNPRINTF
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66 gl_REPLACE_SNPRINTF
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67 fi
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68 ])