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# FUNC_VSNPRINTF_EXISTS
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# Checks if vsnprintf exists. cv_func_vsnprintf_exists is set.
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AC_DEFUN([FUNC_VSNPRINTF_EXISTS],
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[AC_REQUIRE([AC_FUNC_VPRINTF])
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if test $ac_cv_func_vprintf != yes; then cv_func_vsnprintf_exists=no; else
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AC_CHECK_FUNC(vsnprintf, [cv_func_vsnprintf_exists=yes], [cv_func_vsnprintf_exists=no])
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])# FUNC_VSNPRINTF_EXISTS
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# Checks if vsnprintf honors its size argument. VSNPRINTF_IS_VSPRINTF is defined
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# if not. cv_func_vsnprintf_size is set to yes or no.
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# Note that this depends on FUNC_VSNPRINTF_EXISTS, so if that fails this will
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# also fail (and define VSNPRINTF_IS_VSPRINTF).
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AC_DEFUN([FUNC_VSNPRINTF_SIZE],
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[AC_REQUIRE([FUNC_VSNPRINTF_EXISTS])
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if test $cv_func_vsnprintf_exists != yes; then cv_func_vsnprintf_size=no; else
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AC_CACHE_CHECK([if vsnprintf honors the size argument], cv_func_vsnprintf_size,
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#if STDC_HEADERS || HAVE_STDIO_H
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int vsnprintf(char *str, size_t size, const char *format, va_list ap);
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int doit(char *str, size_t size, const char *format, ...){
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r=vsnprintf(str, size, format, ap);
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[[char foo[]="ABC"; doit(foo, 2, "%d", 12);
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exit((foo[0]=='1' && foo[1]=='\0' && foo[2]=='C')?0:1);]])],
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[cv_func_vsnprintf_size=yes],
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[cv_func_vsnprintf_size=no],
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[cv_func_vsnprintf_size=no])])
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test $cv_func_vsnprintf_size != yes && AC_DEFINE(VSNPRINTF_IS_VSPRINTF, 1, [Define if vsnprintf ignores the size argument])
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])# FUNC_VSNPRINTF_SIZE
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# FUNC_VSNPRINTF_RETVAL
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# Checks if vsnprintf returns the number of bytes that would have been written,
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# as specified by C99. VSNPRINTF_BOGUS_RETVAL is defined if not.
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# cv_func_vsnprintf_retval is set to yes or no.
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# Note that this depends on FUNC_VSNPRINTF_SIZE, so if that fails this will fail
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# too and VSNPRINTF_BOGUS_RETVAL will be set.
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AC_DEFUN([FUNC_VSNPRINTF_RETVAL],
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[AC_REQUIRE([FUNC_VSNPRINTF_SIZE])
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if test $cv_func_vsnprintf_size != yes; then cv_func_vsnprintf_retval=no; else
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AC_CACHE_CHECK([if vsnprintf return value is sane], cv_func_vsnprintf_retval,
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#if STDC_HEADERS || HAVE_STDIO_H
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int vsnprintf(char *str, size_t size, const char *format, va_list ap);
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int doit(char *str, size_t size, const char *format, ...){
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r=vsnprintf(str, size, format, ap);
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[[char foo[10]; exit((doit(foo, 1, "%d", 9876)==4)?0:1);]])],
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[cv_func_vsnprintf_retval=yes],
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[cv_func_vsnprintf_retval=no],
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[cv_func_vsnprintf_retval=no])])
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test $cv_func_vsnprintf_retval != yes && AC_DEFINE(VSNPRINTF_BOGUS_RETVAL, 1, [Define if vsnprintf's return value isn't as specified by C99])
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])# FUNC_VSNPRINTF_RETVAL
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# FUNC_VSNPRINTF_NULL_OK
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# ---------------------
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# Checks whether vsnprintf acceps a NULL string if size is zero. Sets
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# cv_func_vsnprintf_null_ok. If so, define VSNPRINTF_NULL_OK.
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# Note that this depends on FUNC_VSNPRINTF_SIZE, so if that fails this will
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# fail too and VSNPRINTF_NULL_OK will not be set.
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AC_DEFUN([FUNC_VSNPRINTF_NULL_OK],
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[AC_REQUIRE([FUNC_VSNPRINTF_SIZE])
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if test $cv_func_vsnprintf_size != yes; then cv_func_vsnprintf_null_ok=no; else
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AC_CACHE_CHECK([if vsnprintf(NULL, 0, ...) works], cv_func_vsnprintf_null_ok,
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#if STDC_HEADERS || HAVE_STDIO_H
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int vsnprintf(char *str, size_t size, const char *format, va_list ap);
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int doit(char *str, size_t size, const char *format, ...){
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va_start(ap, format);
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r=vsnprintf(str, size, format, ap);
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[int r=doit(NULL, 0, "%d", 100); exit((r==3 || r==-1)?0:1);])],
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[cv_func_vsnprintf_null_ok=yes],
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[cv_func_vsnprintf_null_ok=no],
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[cv_func_vsnprintf_null_ok=no])])
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test $cv_func_vsnprintf_null_ok = yes && AC_DEFINE(VSNPRINTF_NULL_OK, 1, [Define if vsnprintf(NULL, 0, ...) works properly])
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])# FUNC_VSNPRINTF_NULL_OK
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# FUNC_VSNPRINTF([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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# Checks various aspects of vsnprintf. In particular:
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# * Is the size honored?
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# * Is the return value correct?
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# * Is NULL with length 0 ok?
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# If all the above pass, HAVE_WORKING_VSNPRINTF is defined and
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# cv_func_vsnprintf_working is set to yes. Otherwise, it's set to no.
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AC_DEFUN([FUNC_VSNPRINTF],
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[AC_REQUIRE([FUNC_VSNPRINTF_RETVAL])
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AC_REQUIRE([FUNC_VSNPRINTF_NULL_OK])
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if test $cv_func_vsnprintf_retval = yes -a $cv_func_vsnprintf_null_ok = yes; then
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AC_DEFINE(HAVE_WORKING_VSNPRINTF, 1, [Define if vsnprintf works properly])
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cv_func_snprintf_working=yes
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cv_func_snprintf_working=no
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# FUNC_VSNPRINTF_LIBOBJ
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# --------------------
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# If FUNC_VSNPRINTF fails, does AC_LIBOBJ.
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AC_DEFUN([FUNC_VSNPRINTF_LIBOBJ],
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[FUNC_VSNPRINTF(, [AC_LIBOBJ([vsnprintf])])
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])#FUNC_VSNPRINTF_LIBOBJ
added
removed
m4/vsnprintf.m4
