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1e6c561d48
"tiny" printf is derived from _vfprintf_r in libc/stdio/nano-vfprintf.c.
"tiny" puts has been implemented so that it just calls write, without
any other processing.
Support for buffering, reentrancy and streams has been removed from
these functions to achieve reduced code size.
This reduced code size implementation of printf and puts can be enabled
in an application by passing "--wrap printf" and "--wrap puts" to the
GNU linker. This will replace references to "printf" and "puts" in user
code with "__wrap_printf" and "__wrap_puts" respectively.
If there is no implementation of these __wrap* functions in user code,
these "tiny" printf and puts implementations will be linked into the
final executable.
The wrapping mechanism is supposed to be invisible to the user:
- A GCC wrapper option such as "-mtiny-printf" will be added to alias
these wrap commands.
- If the user is unaware of the "tiny" implementation, and chooses to
implement their own __wrap_printf and __wrap_puts, their own
implementation will be automatically chosen over the "tiny" printf and
puts from the library.
Newlib must be configured with --enable-newlib-nano-formatted-io for
the "tiny" printf and puts functions to be built into the library.
Code size reduction examples:
printf("Hello World\n")
baseline - msp430-elf-gcc gcc-8_3_0-release
text data bss
5638 214 26
"tiny" puts enabled
text data bss
714 90 20
printf("Hello %d\n", a)
baseline - msp430-elf-gcc gcc-8_3_0-release
text data bss
10916 614 28
"tiny" printf enabled
text data bss
4632 280 20
273 lines
8.2 KiB
C
273 lines
8.2 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2012-2014 ARM Ltd
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the company may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)vfprintf.c 5.50 (Berkeley) 12/16/92";*/
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static char *rcsid = "$Id$";
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#endif /* LIBC_SCCS and not lint */
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <stdint.h>
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#include <wchar.h>
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#include <sys/lock.h>
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#include <stdarg.h>
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#include <string.h>
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#include <newlib.h>
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#include "../../stdio/local.h"
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#include "../../stdlib/local.h"
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#include "../../stdio/fvwrite.h"
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#include "../../stdio/nano-vfprintf_local.h"
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/* Bypass *putc* fns called by the default _sfputs_r to save code size.
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Among other things, this means there is no buffering of the string before
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it is sent to <<write>>, but <<write>> does its own buffering so we won't
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lose chars when buf is larger than sizeof(CIOBUF). */
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int
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__tiny__sfputs_r (struct _reent *ptr,
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FILE *fp,
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const char *buf,
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size_t len)
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{
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return write (1, buf, len);
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}
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/* VFPRINTF_R from nano-vfprintf.c but:
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- No support for reentrancy
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- No support for streams
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- __SINGLE_THREAD__ assumed.
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- No STRING_ONLY variant (either way the formatted string would end up
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being sent to <<write>> via <<__tiny__sfputs_r>>.
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Basically, format the string as normal, and send it to write. */
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int
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__tiny_vfprintf_r (struct _reent *data,
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FILE * fp,
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const char *fmt0,
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va_list ap)
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{
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register char *fmt; /* Format string. */
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register int n, m; /* Handy integers (short term usage). */
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register char *cp; /* Handy char pointer (short term usage). */
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const char *flag_chars;
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struct _prt_data_t prt_data; /* All data for decoding format string. */
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va_list ap_copy;
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/* Output function pointer. */
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int (*pfunc)(struct _reent *, FILE *, const char *, size_t len);
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pfunc = __tiny__sfputs_r;
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fmt = (char *)fmt0;
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prt_data.ret = 0;
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prt_data.blank = ' ';
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prt_data.zero = '0';
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/* GCC PR 14577 at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14557 */
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va_copy (ap_copy, ap);
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/* Scan the format for conversions (`%' character). */
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for (;;)
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{
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cp = fmt;
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while (*fmt != '\0' && *fmt != '%')
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fmt += 1;
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if ((m = fmt - cp) != 0)
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{
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PRINT (cp, m);
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prt_data.ret += m;
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}
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if (*fmt == '\0')
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goto done;
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fmt++; /* Skip over '%'. */
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prt_data.flags = 0;
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prt_data.width = 0;
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prt_data.prec = -1;
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prt_data.dprec = 0;
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prt_data.l_buf[0] = '\0';
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#ifdef FLOATING_POINT
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prt_data.lead = 0;
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#endif
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/* The flags. */
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/*
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* ``Note that 0 is taken as a flag, not as the
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* beginning of a field width.''
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* -- ANSI X3J11
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*/
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flag_chars = "#-0+ ";
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for (; cp = memchr (flag_chars, *fmt, 5); fmt++)
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prt_data.flags |= (1 << (cp - flag_chars));
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if (prt_data.flags & SPACESGN)
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prt_data.l_buf[0] = ' ';
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/*
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* ``If the space and + flags both appear, the space
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* flag will be ignored.''
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* -- ANSI X3J11
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*/
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if (prt_data.flags & PLUSSGN)
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prt_data.l_buf[0] = '+';
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/* The width. */
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if (*fmt == '*')
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{
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/*
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* ``A negative field width argument is taken as a
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* - flag followed by a positive field width.''
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* -- ANSI X3J11
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* They don't exclude field widths read from args.
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*/
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prt_data.width = GET_ARG (n, ap_copy, int);
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if (prt_data.width < 0)
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{
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prt_data.width = -prt_data.width;
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prt_data.flags |= LADJUST;
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}
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fmt++;
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}
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else
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{
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for (; is_digit (*fmt); fmt++)
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prt_data.width = 10 * prt_data.width + to_digit (*fmt);
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}
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/* The precision. */
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if (*fmt == '.')
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{
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fmt++;
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if (*fmt == '*')
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{
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fmt++;
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prt_data.prec = GET_ARG (n, ap_copy, int);
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if (prt_data.prec < 0)
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prt_data.prec = -1;
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}
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else
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{
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prt_data.prec = 0;
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for (; is_digit (*fmt); fmt++)
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prt_data.prec = 10 * prt_data.prec + to_digit (*fmt);
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}
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}
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/* The length modifiers. */
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flag_chars = "hlL";
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if ((cp = memchr (flag_chars, *fmt, 3)) != NULL)
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{
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prt_data.flags |= (SHORTINT << (cp - flag_chars));
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fmt++;
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}
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/* The conversion specifiers. */
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prt_data.code = *fmt++;
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cp = memchr ("efgEFG", prt_data.code, 6);
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#ifdef FLOATING_POINT
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/* If cp is not NULL, we are facing FLOATING POINT NUMBER. */
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if (cp)
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{
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/* Consume floating point argument if _printf_float is not
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linked. */
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if (_printf_float == NULL)
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{
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if (prt_data.flags & LONGDBL)
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GET_ARG (N, ap_copy, _LONG_DOUBLE);
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else
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GET_ARG (N, ap_copy, double);
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}
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else
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n = _printf_float (data, &prt_data, fp, pfunc, &ap_copy);
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}
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else
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#endif
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n = _printf_i (data, &prt_data, fp, pfunc, &ap_copy);
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if (n == -1)
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goto error;
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prt_data.ret += n;
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}
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done:
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error:
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va_end (ap_copy);
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return (__sferror (fp) ? EOF : prt_data.ret);
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}
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int
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__wrap_printf (const char *__restrict fmt, ...)
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{
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int ret;
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va_list ap;
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struct _reent *ptr = _REENT;
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va_start (ap, fmt);
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ret = __tiny_vfprintf_r (ptr, _stdout_r (ptr), fmt, ap);
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va_end (ap);
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return ret;
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}
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int printf (const char *__restrict fmt, ...) __attribute__ ((weak, alias ("__wrap_printf")));
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