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-rw-r--r-- | libbb/printf.c | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/libbb/printf.c b/libbb/printf.c deleted file mode 100644 index f0ddb86..0000000 --- a/libbb/printf.c +++ /dev/null @@ -1,96 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * *printf implementations for busybox - * - * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> - * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. - */ - -/* Mar 12, 2003 Manuel Novoa III - * - * While fwrite(), fputc(), fputs(), etc. all set the stream error flag - * on failure, the *printf functions are unique in that they can fail - * for reasons not related to the actual output itself. Among the possible - * reasons for failure which don't set the streams error indicator, - * SUSv3 lists EILSEQ, EINVAL, and ENOMEM. - * - * In some cases, it would be desirable to have a group of *printf() - * functions available that _always_ set the stream error indicator on - * failure. That would allow us to defer error checking until applet - * exit. Unfortunately, there is no standard way of setting a streams - * error indicator... even though we can clear it with clearerr(). - */ - -/* Mar 22, 2006 Rich Felker III - * - * Actually there is a portable way to set the error indicator. See below. - * It is not thread-safe as written due to a race condition with file - * descriptors but since BB is not threaded that does not matter. It can be - * made thread-safe at the expense of slightly more code, if this is ever - * needed in the future. - */ - -#include <stdio.h> -#include <stdarg.h> -#include <unistd.h> -#include <errno.h> -#include "libbb.h" - -int bb_vfprintf(FILE * __restrict stream, - const char * __restrict format, - va_list arg) -{ - int rv; - - if ((rv = vfprintf(stream, format, arg)) < 0) { - /* The following sequence portably sets the error flag for - * stream on any remotely POSIX-compliant implementation. */ - - int errno_save = errno; - int fd = fileno(stream); - int tmp = dup(fd); - - fflush(stream); - close(fd); - /* Force an attempted write to nonexistant fd => EBADF */ - fputc(0, stream); - fflush(stream); - /* Restore the stream's original fd */ - dup2(tmp, fd); - close(tmp); - errno = errno_save; - } - - return rv; -} - -int bb_vprintf(const char * __restrict format, va_list arg) -{ - return bb_vfprintf(stdout, format, arg); -} - -int bb_fprintf(FILE * __restrict stream, - const char * __restrict format, ...) -{ - va_list arg; - int rv; - - va_start(arg, format); - rv = bb_vfprintf(stream, format, arg); - va_end(arg); - - return rv; -} - -int bb_printf(const char * __restrict format, ...) -{ - va_list arg; - int rv; - - va_start(arg, format); - rv = bb_vfprintf(stdout, format, arg); - va_end(arg); - - return rv; -} |