?RCS: Copyright (c) 2005-2008 H.Merijn Brand
?RCS:
?RCS: You may distribute under the terms of either the GNU General Public
?RCS: License or the Artistic License, as specified in the README file.
?RCS:
?MAKE:d_sprintf_returns_strlen: Compile cat rm_try run i_stdlib i_string i_math echo
?MAKE:	-pick add $@ %<
?S:d_sprintf_returns_strlen:
?S:	This variable defines whether sprintf returns the length of the string
?S:	(as per the ANSI spec). Some C libraries retain compatibility with
?S:	pre-ANSI C and return a pointer to the passed in buffer; for these
?S:	this variable will be undef.
?S:.
?C:SPRINTF_RETURNS_STRLEN:
?C:	This variable defines whether sprintf returns the length of the string
?C:	(as per the ANSI spec). Some C libraries retain compatibility with
?C:	pre-ANSI C and return a pointer to the passed in buffer; for these
?C:	this variable will be undef.
?C:.
?H:#$d_sprintf_returns_strlen SPRINTF_RETURNS_STRLEN	/**/
?H:.
?T:xxx
?F:!try
: see if sprintf returns the length of the string in the buffer as per ANSI
$echo "Checking whether sprintf returns the length of the string..." >&4
$cat <<EOP >try.c
#include <stdio.h>
#$i_stdlib I_STDLIB
#ifdef I_STDLIB
#include <stdlib.h>
#endif
#$i_string I_STRING
#ifdef I_STRING
#  include <string.h>
#else
#  include <strings.h>
#endif
#$i_math I_MATH
#ifdef I_MATH
#include <math.h>
#endif

char buffer[256];

int check (size_t expect, int test) {
  size_t got = strlen(buffer);
  if (expect == got)
    return 0;

  printf("expected %ld, got %ld in test %d '%s'\n", (long) expect, (long) got,
       test, buffer);
  exit (test);
}

int main(int argc, char **argv) {
  int test = 0;

  check(sprintf(buffer, ""), ++test);
  check(sprintf(buffer, "%s %s", "perl", "rules"), ++test);
  check(sprintf(buffer, "I like %g", atan2(0,-1)), ++test);

  return 0;
}
EOP
set try

if eval $compile; then
    xxx="`$run ./try`"
    case "$?" in
	0) cat >&4 <<EOM
sprintf returns the length of the string (as ANSI says it should)
EOM
	d_sprintf_returns_strlen="$define"
	;;
	*) cat >&4 <<EOM
sprintf does not return the length of the string (how old is this system?)
EOM
	d_sprintf_returns_strlen="$undef"
        ;;
    esac
else
    echo "(I can't seem to compile the test program--assuming it doesn't)" >&4
    d_sprintf_returns_strlen="$undef"
fi
$rm_try