On 02/15/16 15:48, Bruce Evans wrote:
On Mon, 15 Feb 2016, Pedro F. Giffuni wrote:Log: fputs: Return the number of bytes written. POSIX.1-2008 requires that successful completion simply return a non-negative integer. We have regularly returned a constant value. Another, equally valid, implementation convention implies returning the number of bytes written. Adopt this last convention to be in line with what Apple's libc does. POSIX also explicitly notes: Note that this implementation convention cannot be adhered to for strings longer than {INT_MAX} bytes as the value would not be representable in the return type of the function. For backwards-compatibility, implementations can return the number of bytes for strings of up to {INT_MAX} bytes, and return {INT_MAX} for all longer strings. Developers shouldn't depend specifically on either convention but the change may help port software from Apple. Differential Revision: https://reviews.freebsd.org/D442 (Partial) Obtained from: Apple Inc. (Libc 997.90.3 with changes) Relnotes: yes Modified: head/lib/libc/stdio/fputs.c Modified: head/lib/libc/stdio/fputs.c ============================================================================== --- head/lib/libc/stdio/fputs.c Mon Feb 15 17:14:10 2016 (r295630) +++ head/lib/libc/stdio/fputs.c Mon Feb 15 18:13:33 2016 (r295631) @@ -37,6 +37,7 @@ static char sccsid[] = "@(#)fputs.c 8.1 __FBSDID("$FreeBSD$"); #include "namespace.h" +#include <limits.h> #include <stdio.h> #include <string.h> #include "un-namespace.h" @@ -62,5 +63,7 @@ fputs(const char * __restrict s, FILE * ORIENT(fp, -1); retval = __sfvwrite(fp, &uio); FUNLOCKFILE(fp); + if (retval == 0) + return (iov.iov_len > INT_MAX ? INT_MAX : uio.uio_resid); return (retval); }Testing would have shown that this change has no effect except in the unusual case where iov.iov_len > INT_MAX. uio.resid is always reduced to 0 if all the output actually worked.
My mistake, obviously. It was a last minute change to avoid a cast. Will fix. Thanks! Pedro.
Bruce
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