Date: Fri, 16 Dec 2016 01:44:51 +0000 (UTC) From: "Conrad E. Meyer" <cem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r310138 - head/lib/libc/stdio Message-ID: <201612160144.uBG1ipjW016736@repo.freebsd.org>
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Author: cem Date: Fri Dec 16 01:44:50 2016 New Revision: 310138 URL: https://svnweb.freebsd.org/changeset/base/310138 Log: vfprintf(3): Add support for kernel %b format This is a direct port of the kernel %b format. I'm unclear on if (more) non-portable printf extensions will be a problem. I think it's desirable to have userspace formats include all kernel formats, but there may be competing goals I'm not aware of. Reviewed by: no one, unfortunately Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D8426 Modified: head/lib/libc/stdio/vfprintf.c Modified: head/lib/libc/stdio/vfprintf.c ============================================================================== --- head/lib/libc/stdio/vfprintf.c Fri Dec 16 01:42:51 2016 (r310137) +++ head/lib/libc/stdio/vfprintf.c Fri Dec 16 01:44:50 2016 (r310138) @@ -611,6 +611,37 @@ reswitch: switch (ch) { case 'z': flags |= SIZET; goto rflag; + case 'b': + { + const char *q; + int anybitset, bit; + + ulval = (u_int)GETARG(int); + cp = GETARG(char *); + + q = __ultoa(ulval, buf + BUF, *cp++, 0, xdigs_lower); + PRINT(q, buf + BUF - q); + + if (ulval == 0) + break; + + for (anybitset = 0; *cp;) { + bit = *cp++; + if (ulval & (1 << (bit - 1))) { + PRINT(anybitset ? "," : "<", 1); + q = cp; + for (; (bit = *cp) > ' '; ++cp) + continue; + PRINT(q, cp - q); + anybitset = 1; + } else + for (; *cp > ' '; ++cp) + continue; + } + if (anybitset) + PRINT(">", 1); + } + continue; case 'C': flags |= LONGINT; /*FALLTHROUGH*/
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