Add a probe for whether sprintf returns the length of the buffer.

Update all the canned config.sh files.
Assume that symbian and Win32 are all ANSI conformant, note that ARM
Linux (ie glibc) will be, don't assume that any other platform is.

p4raw-id: //depot/perl@25831

1 files changed, 64 insertions, 0 deletions

diff --git a/Configure b/Configure
index b282a16a10..72028b561c 100755
--- a/Configure
+++ b/Configure
@@ -775,6 +775,7 @@ d_voidsig=''
 signal_t=''
 d_volatile=''
 d_charvspr=''
+d_sprintf_returns_strlen=''
 d_vprintf=''
 d_wait4=''
 d_waitpid=''
@@ -14185,6 +14186,68 @@ EOCP
 
     esac
 
+: 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
+#$i_math I_MATH
+#ifdef I_MATH
+#include <math.h>
+#endif
+
+char buffer[256];
+
+int check (size_t expect, int test) {
+  size_t got = strlen(buffer);
+  if (expect == got)
+    return 0;
+
+  printf("expected %ld, got %ld in test %d '%s'\n", (long) expect, (long) got,
+       test, buffer);
+  exit (test);
+}
+
+int main(int argc, char **argv) {
+  int test = 0;
+
+  check(sprintf(buffer, ""), ++test);
+  check(sprintf(buffer, "%s %s", "perl", "rules"), ++test);
+  check(sprintf(buffer, "I like %g", atan2(0,-1)), ++test);
+
+  return 0;
+}
+EOP
+set try
+
+d_sprintf_returns_strlen="$undef"
+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="$undef"
+        ;;
+    esac
+fi
+
+$rm -f try.* try
+
 : see if link exists
 set link d_link
 eval $inlibc
@@ -21347,6 +21410,7 @@ d_void_closedir='$d_void_closedir'
 d_voidsig='$d_voidsig'
 d_voidtty='$d_voidtty'
 d_volatile='$d_volatile'
+d_sprintf_returns_strlen='$d_sprintf_returns_strlen'
 d_vprintf='$d_vprintf'
 d_wait4='$d_wait4'
 d_waitpid='$d_waitpid'