1 files changed, 181 insertions, 0 deletions

diff --git a/busybox/libbb/printf.c b/busybox/libbb/printf.c
new file mode 100644
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--- /dev/null
+++ b/busybox/libbb/printf.c
@@ -0,0 +1,181 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * *printf implementations for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/* 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().
+ *
+ * Therefore, we have to resort to implementation dependent code.  Feel
+ * free to send patches for stdio implementations where the following
+ * fails.
+ *
+ * NOTE: None of this is thread safe.  As busybox is a non-threaded app,
+ *       that isn't currently an issue.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include "libbb.h"
+
+#if defined(__UCLIBC__)
+
+# if defined(__FLAG_ERROR)
+/* Using my newer stdio implementation.  Unlocked macros are:
+ * #define __CLEARERR(stream) \
+          ((stream)->modeflags &= ~(__FLAG_EOF|__FLAG_ERROR), (void)0)
+ * #define __FEOF(stream)               ((stream)->modeflags & __FLAG_EOF)
+ * #define __FERROR(stream)     ((stream)->modeflags & __FLAG_ERROR)
+ */
+#  if defined(__MASK_READING)
+#   define SET_FERROR_UNLOCKED(S)    ((S)->__modeflags |= __FLAG_ERROR)
+#  else
+#   define SET_FERROR_UNLOCKED(S)    ((S)->modeflags |= __FLAG_ERROR)
+#  endif
+
+# elif defined(__MODE_ERR)
+/* Using either the original stdio implementation (from dev86) or
+ * my original stdio rewrite.  Macros were:
+ * #define ferror(fp)   (((fp)->mode&__MODE_ERR) != 0)
+ * #define feof(fp)     (((fp)->mode&__MODE_EOF) != 0)
+ * #define clearerr(fp) ((fp)->mode &= ~(__MODE_EOF|__MODE_ERR),0)
+ */
+#define SET_FERROR_UNLOCKED(S)    ((S)->mode |= __MODE_ERR)
+
+# else
+#error unknown uClibc stdio implemenation!
+# endif
+
+#elif defined(__GLIBC__)
+
+# if defined(_STDIO_USES_IOSTREAM)
+/* Apparently using the newer libio implementation, with associated defines:
+ * #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
+ * #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
+ */
+#define SET_FERROR_UNLOCKED(S)    ((S)->_flags |= _IO_ERR_SEEN)
+
+# else
+/* Assume the older version of glibc which used a bitfield entry
+ * as a stream error flag.  The associated defines were:
+ * #define __clearerr(stream)      ((stream)->__error = (stream)->__eof = 0)
+ * #define feof_unlocked(stream)         ((stream)->__eof != 0)
+ * #define ferror_unlocked(stream)       ((stream)->__error != 0)
+ */
+#define SET_FERROR_UNLOCKED(S)    ((S)->__error = 1)
+
+# endif
+
+#elif defined(__NEWLIB_H__)
+/* I honestly don't know if there are different versions of stdio in
+ * newlibs history.  Anyway, here's what's current.
+ * #define __sfeof(p)      (((p)->_flags & __SEOF) != 0)
+ * #define __sferror(p)    (((p)->_flags & __SERR) != 0)
+ * #define __sclearerr(p)  ((void)((p)->_flags &= ~(__SERR|__SEOF)))
+ */
+#define SET_FERROR_UNLOCKED(S)    ((S)->_flags |= __SERR)
+
+#elif defined(__dietlibc__)
+/*
+ *     WARNING!!!  dietlibc is quite buggy.  WARNING!!!
+ *
+ * Some example bugs as of March 12, 2003...
+ *   1) fputc() doesn't set the error indicator on failure.
+ *   2) freopen() doesn't maintain the same stream object, contrary to
+ *      standards.  This makes it useless in its primary role of
+ *      reassociating stdin/stdout/stderr.
+ *   3) printf() often fails to correctly format output when conversions
+ *      involve padding.  It is also practically useless for floating
+ *      point output.
+ *
+ * But, if you're determined to use it anyway, (as of the current version)
+ * you can extract the information you need from dietstdio.h.  See the
+ * other library implementations for examples.
+ */
+#error dietlibc is currently not supported.  Please see the commented source.
+
+#else /* some other lib */
+/* Please see the comments for the above supported libraries for examples
+ * of what is required to support your stdio implementation.
+ */
+#error Your stdio library is currently not supported.  Please see the commented source.
+#endif
+
+#ifdef L_bb_vfprintf
+extern int bb_vfprintf(FILE * __restrict stream,
+                                           const char * __restrict format,
+                                           va_list arg)
+{
+        int rv;
+
+        if ((rv = vfprintf(stream, format, arg)) < 0) {
+                SET_FERROR_UNLOCKED(stream);
+        }
+
+        return rv;
+}
+#endif
+
+#ifdef L_bb_vprintf
+extern int bb_vprintf(const char * __restrict format, va_list arg)
+{
+        return bb_vfprintf(stdout, format, arg);
+}
+#endif
+
+#ifdef L_bb_fprintf
+extern 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;
+}
+#endif
+
+#ifdef L_bb_printf
+extern 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;
+}
+#endif