Use sprintf return value instead of invoking strlen on result.

In the old days this wasn't portable, since some sprintf
implementations returned char *.  But they died out years ago and
Emacs already assumes sprintf returns int.
Similarly for float_to_string.
This patch speeds up (number-to-string 1000) by 3% on Fedora 15 x86-64.
* ccl.c (ccl_driver):
* character.c (string_escape_byte8):
* data.c (Fnumber_to_string):
* doprnt.c (doprnt):
* print.c (print_object):
* xdisp.c (message_dolog):
* xfns.c (syms_of_xfns):
Use sprintf or float_to_string result to avoid need to call strlen.
* data.c (Fnumber_to_string):
Use make_unibyte_string, since the string must be ASCII.
* lisp.h, print.c (float_to_string): Now returns int length.
* term.c (produce_glyphless_glyph):
Use sprintf result rather than recomputing it.

1 files changed, 2 insertions, 6 deletions

diff --git a/src/character.c b/src/character.c
index fbd23409d08..da182488033 100644
--- a/src/character.c
+++ b/src/character.c
@@ -867,8 +867,7 @@ string_escape_byte8 (Lisp_Object string)
           {
             c = STRING_CHAR_ADVANCE (src);
             c = CHAR_TO_BYTE8 (c);
-            sprintf ((char *) dst, "\\%03o", c);
-            dst += 4;
+            dst += sprintf ((char *) dst, "\\%03o", c);
           }
         else
           while (len--) *dst++ = *src++;
@@ -878,10 +877,7 @@ string_escape_byte8 (Lisp_Object string)
       {
         c = *src++;
         if (c >= 0x80)
-          {
-            sprintf ((char *) dst, "\\%03o", c);
-            dst += 4;
-          }
+          dst += sprintf ((char *) dst, "\\%03o", c);
         else
           *dst++ = c;
       }