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2003-08-07 Matthias Clasen <maclas@gmx.de> * glib/trio/trio.c (trio_snprintf, trio_vsnprintf): Accept NULL buffer if max is zero. * acinclude.m4 (AC_FUNC_SNPRINTF_C99): Tests whether the system snprintf() is good enough. * configure.in: Use AC_FUNC_SNPRINTF_C99. (#106091)
132 lines
3.2 KiB
Plaintext
132 lines
3.2 KiB
Plaintext
dnl @synopsis AC_FUNC_VSNPRINTF_C99
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dnl
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dnl Check whether there is a vsnprintf() function with C99 semantics installed.
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dnl
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AC_DEFUN([AC_FUNC_VSNPRINTF_C99],
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[AC_CACHE_CHECK(for C99 vsnprintf,
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ac_cv_func_vsnprintf_c99,
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[AC_TRY_RUN(
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[#include <stdio.h>
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#include <stdarg.h>
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int
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doit(char * s, ...)
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{
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char buffer[32];
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va_list args;
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int r;
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va_start(args, s);
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r = vsnprintf(buffer, 5, s, args);
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va_end(args);
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if (r != 7)
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exit(1);
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exit(0);
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}
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int
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main(void)
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{
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doit("1234567");
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exit(1);
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}], ac_cv_func_vsnprintf_c99=yes, ac_cv_func_vsnprintf_c99=no, ac_cv_func_vsnprintf_c99=no)])
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dnl Note that the default is to be pessimistic in the case of cross compilation.
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dnl If you know that the target has a C99 vsnprintf(), you can get around this
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dnl by setting ac_func_vsnprintf_c99 to yes, as described in the Autoconf manual.
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if test $ac_cv_func_vsnprintf_c99 = yes; then
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AC_DEFINE(HAVE_C99_VSNPRINTF, 1,
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[Define if you have a version of the vsnprintf function
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with semantics as specified by the ISO C99 standard.])
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fi
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])# AC_FUNC_VSNPRINTF_C99
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dnl @synopsis AC_FUNC_SNPRINTF_C99
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dnl
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dnl Check whether there is a snprintf() function with C99 semantics installed.
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dnl
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AC_DEFUN([AC_FUNC_SNPRINTF_C99],
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[AC_CACHE_CHECK(for C99 snprintf,
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ac_cv_func_snprintf_c99,
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[AC_TRY_RUN(
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[#include <stdio.h>
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#include <stdarg.h>
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int
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doit()
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{
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char buffer[32];
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va_list args;
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int r;
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r = snprintf(buffer, 5, "1234567");
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if (r != 7)
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exit(1);
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r = snprintf(buffer, 0, "1234567");
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if (r != 7)
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exit(1);
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r = snprintf(NULL, 0, "1234567");
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if (r != 7)
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exit(1);
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exit(0);
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}
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int
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main(void)
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{
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doit();
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exit(1);
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}], ac_cv_func_snprintf_c99=yes, ac_cv_func_snprintf_c99=no, ac_cv_func_snprintf_c99=no)])
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dnl Note that the default is to be pessimistic in the case of cross compilation.
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dnl If you know that the target has a C99 snprintf(), you can get around this
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dnl by setting ac_func_snprintf_c99 to yes, as described in the Autoconf manual.
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if test $ac_cv_func_snprintf_c99 = yes; then
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AC_DEFINE(HAVE_C99_SNPRINTF, 1,
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[Define if you have a version of the snprintf function
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with semantics as specified by the ISO C99 standard.])
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fi
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])# AC_FUNC_SNPRINTF_C99
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dnl @synopsis AC_FUNC_PRINTF_UNIX98
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dnl
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dnl Check whether the printf() family supports Unix98 %n$ positional parameters
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dnl
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AC_DEFUN([AC_FUNC_PRINTF_UNIX98],
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[AC_CACHE_CHECK(whether printf supports positional parameters,
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ac_cv_func_printf_unix98,
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[AC_TRY_RUN(
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[#include <stdio.h>
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int
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main (void)
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{
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char buffer[128];
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sprintf (buffer, "%2\$d %3\$d %1\$d", 1, 2, 3);
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if (strcmp ("2 3 1", buffer) == 0)
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exit (0);
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exit (1);
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}], ac_cv_func_printf_unix98=yes, ac_cv_func_printf_unix98=no, ac_cv_func_printf_unix98=no)])
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dnl Note that the default is to be pessimistic in the case of cross compilation.
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dnl If you know that the target printf() supports positional parameters, you can get around
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dnl this by setting ac_func_printf_unix98 to yes, as described in the Autoconf manual.
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if test $ac_cv_func_printf_unix98 = yes; then
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AC_DEFINE(HAVE_UNIX98_PRINTF, 1,
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[Define if your printf function family supports positional parameters
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as specified by Unix98.])
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fi
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])# AC_FUNC_PRINTF_UNIX98
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