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1) Restore back comment about snprintf()

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2) Optimize string buffer copy to call memcpy() and update pointers
only for count > 0, it makes snprintf(NULL, 0, ...) more efficient
This commit is contained in:
ache 1997-12-24 23:23:18 +00:00
parent d6bcc605a0
commit 33cd251a1b
1 changed files with 10 additions and 7 deletions
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17
lib/libc/stdio/fvwrite.c
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@ -39,7 +39,7 @@
static char sccsid[] = "@(#)fvwrite.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
"$Id: fvwrite.c,v 1.5 1997/02/22 15:02:08 peter Exp $";
"$Id: fvwrite.c,v 1.6 1997/12/24 13:17:13 ache Exp $";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
@ -104,9 +104,10 @@ __sfvwrite(fp, uio)
* one _bf._size byte chunk directly (without copying).
*
* String output is a special case: write as many bytes
* as fit, but pretend we wrote everything. This avoids
* snprintf() write function (so that the write function
* can be invalid).
* as fit, but pretend we wrote everything. This makes
* snprintf() return the number of bytes needed, rather
* than the number used, and avoids its write function
* (so that the write function can be invalid).
*/
do {
GETIOV(;);
@ -114,9 +115,11 @@ __sfvwrite(fp, uio)
if (fp->_flags & __SSTR) {
if (len < w)
w = len;
COPY(w); /* copy MIN(fp->_w,len), */
fp->_w -= w;
fp->_p += w;
if (w > 0) {
COPY(w); /* copy MIN(fp->_w,len), */
fp->_w -= w;
fp->_p += w;
}
w = len; /* but pretend copied all */
} else if (fp->_p > fp->_bf._base && len > w) {
/* fill and flush */