forked from Imagelibrary/rtems
ce1fb41a6c
For example, printf("%+i", 1) prints "+1". However, kvprintf() did
print just "1" for this example. According to PRINTF(3):
A sign must always be placed before a number produced by a signed
conversion.
For "%+r" radix conversions, keep the "+" handling as it is, since this
is a non-standard conversion. For "%+p" pointer conversions, continue
to ignore the sign modifier to be in line with libc.
This change allows to support the ' conversion modifier in the future.
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1310
371 lines
8.4 KiB
C
371 lines
8.4 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSDeviceIO
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*
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* @brief This source file contains the implementation of
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* _IO_Vprintf().
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*/
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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#include <rtems/dev/io.h>
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <string.h>
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/* Max number conversion buffer length: a intmax_t in base 8, plus NUL byte. */
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#define MAXNBUF (howmany(sizeof(intmax_t) * NBBY, 3) + 1)
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static inline int imax(int a, int b) { return (a > b ? a : b); }
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static char const hex2ascii_data[2][16] = {
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{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f' },
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{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'A', 'B', 'C', 'D', 'E', 'F' }
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};
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static inline char
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hex2ascii(int hex)
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{
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return (hex2ascii_data[0][hex]);
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}
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/*
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* Put a NUL-terminated ASCII number (base <= 16) in a buffer in reverse
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* order; return an optional length and a pointer to the last character
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* written in the buffer (i.e., the first character of the string).
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* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
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*/
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static inline char *
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ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
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{
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char *p;
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p = nbuf;
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*p = '\0';
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do {
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*++p = hex2ascii_data[upper][num % base];
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} while (num /= base);
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*lenp = p - nbuf;
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return (p);
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}
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int
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_IO_Vprintf(IO_Put_char put_char, void *arg, char const *fmt, va_list ap)
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{
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#define PCHAR(c) {int cc=(c); (*put_char)(cc, arg); retval++; }
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char nbuf[MAXNBUF];
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const char *p, *percent, *q;
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u_char *up;
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int ch, n, sign;
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uintmax_t num;
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int base, lflag, tmp, width, ladjust, sharpflag, dot;
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int cflag, hflag, jflag;
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RTEMS_STATIC_ASSERT(sizeof(intmax_t) == sizeof(long long), _IO_Vprintf_j);
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#if __SIZEOF_PTRDIFF_T__ == __SIZEOF_LONG__
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#define tflag lflag
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#else
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int tflag;
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#endif
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#if __SIZEOF_SIZE_T__ == __SIZEOF_LONG__
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#define zflag lflag
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#else
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int zflag;
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#endif
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int dwidth, upper;
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char padc;
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int stop = 0, retval = 0;
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num = 0;
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if (fmt == NULL)
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fmt = "(fmt null)\n";
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for (;;) {
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padc = ' ';
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width = 0;
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while ((ch = (u_char)*fmt++) != '%' || stop) {
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if (ch == '\0')
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return (retval);
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PCHAR(ch);
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}
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percent = fmt - 1;
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lflag = 0; ladjust = 0; sharpflag = 0;
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sign = 0; dot = 0; dwidth = 0; upper = 0;
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cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
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reswitch: switch (ch = (u_char)*fmt++) {
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case '.':
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dot = 1;
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goto reswitch;
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case '#':
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sharpflag = 1;
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goto reswitch;
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case '+':
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sign = '+';
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goto reswitch;
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case '-':
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ladjust = 1;
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goto reswitch;
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case '%':
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PCHAR(ch);
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break;
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case '*':
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if (!dot) {
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width = va_arg(ap, int);
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if (width < 0) {
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ladjust = !ladjust;
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width = -width;
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}
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} else {
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dwidth = va_arg(ap, int);
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}
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goto reswitch;
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case '0':
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if (!dot) {
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padc = '0';
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goto reswitch;
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}
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/* FALLTHROUGH */
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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for (n = 0;; ++fmt) {
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n = n * 10 + ch - '0';
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ch = *fmt;
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if (ch < '0' || ch > '9')
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break;
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}
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if (dot)
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dwidth = n;
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else
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width = n;
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goto reswitch;
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case 'c':
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width -= 1;
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if (!ladjust && width > 0)
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while (width--)
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PCHAR(padc);
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PCHAR(va_arg(ap, int));
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if (ladjust && width > 0)
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while (width--)
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PCHAR(padc);
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break;
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case 'D':
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up = va_arg(ap, u_char *);
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p = va_arg(ap, char *);
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if (!width)
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width = 16;
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while(width--) {
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PCHAR(hex2ascii(*up >> 4));
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PCHAR(hex2ascii(*up & 0x0f));
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up++;
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if (width)
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for (q=p;*q;q++)
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PCHAR(*q);
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}
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break;
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case 'd':
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case 'i':
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base = 10;
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goto handle_sign;
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case 'h':
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if (hflag) {
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hflag = 0;
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cflag = 1;
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} else
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hflag = 1;
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goto reswitch;
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case 'j':
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jflag = 1;
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goto reswitch;
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case 'l':
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if (lflag) {
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jflag = 1;
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} else
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lflag = 1;
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goto reswitch;
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case 'o':
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base = 8;
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goto handle_nosign;
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case 'p':
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base = 16;
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sharpflag = (width == 0);
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sign = 0;
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num = (uintptr_t)va_arg(ap, void *);
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goto number;
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case 's':
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p = va_arg(ap, char *);
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if (p == NULL)
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p = "(null)";
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if (!dot)
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n = strlen (p);
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else
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for (n = 0; n < dwidth && p[n]; n++)
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continue;
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width -= n;
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if (!ladjust && width > 0)
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while (width--)
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PCHAR(padc);
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while (n--)
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PCHAR(*p++);
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if (ladjust && width > 0)
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while (width--)
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PCHAR(padc);
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break;
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case 't':
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tflag = 1;
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goto reswitch;
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case 'u':
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base = 10;
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goto handle_nosign;
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case 'X':
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upper = 1;
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/* FALLTHROUGH */
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case 'x':
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base = 16;
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goto handle_nosign;
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case 'y':
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base = 16;
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goto handle_sign;
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case 'z':
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zflag = 1;
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goto reswitch;
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handle_nosign:
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if (jflag)
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num = va_arg(ap, uintmax_t);
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#if __SIZEOF_PTRDIFF_T__ != __SIZEOF_LONG__
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else if (tflag)
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num = va_arg(ap, ptrdiff_t);
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#endif
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else if (lflag)
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num = va_arg(ap, u_long);
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#if __SIZEOF_SIZE_T__ != __SIZEOF_LONG__
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else if (zflag)
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num = va_arg(ap, size_t);
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#endif
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else if (hflag)
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num = (u_short)va_arg(ap, int);
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else if (cflag)
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num = (u_char)va_arg(ap, int);
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else
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num = va_arg(ap, u_int);
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goto number;
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handle_sign:
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if (jflag)
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num = va_arg(ap, intmax_t);
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#if __SIZEOF_PTRDIFF_T__ != __SIZEOF_LONG__
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else if (tflag)
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num = va_arg(ap, ptrdiff_t);
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#endif
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else if (lflag)
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num = va_arg(ap, long);
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#if __SIZEOF_SIZE_T__ != __SIZEOF_LONG__
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else if (zflag)
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num = va_arg(ap, ssize_t);
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#endif
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else if (hflag)
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num = (short)va_arg(ap, int);
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else if (cflag)
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num = (signed char)va_arg(ap, int);
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else
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num = va_arg(ap, int);
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if ((intmax_t)num < 0) {
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sign = '-';
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num = -(intmax_t)num;
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}
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number:
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p = ksprintn(nbuf, num, base, &n, upper);
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tmp = 0;
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if (sharpflag && num != 0) {
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if (base == 8)
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tmp++;
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else if (base == 16)
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tmp += 2;
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}
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if (sign)
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tmp++;
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if (!ladjust && padc == '0')
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dwidth = width - tmp;
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width -= tmp + imax(dwidth, n);
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dwidth -= n;
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if (!ladjust)
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while (width-- > 0)
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PCHAR(' ');
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if (sign)
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PCHAR(sign);
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if (sharpflag && num != 0) {
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if (base == 8) {
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PCHAR('0');
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} else if (base == 16) {
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PCHAR('0');
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PCHAR('x');
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}
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}
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while (dwidth-- > 0)
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PCHAR('0');
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while (*p)
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PCHAR(*p--);
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if (ladjust)
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while (width-- > 0)
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PCHAR(' ');
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break;
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default:
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while (percent < fmt)
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PCHAR(*percent++);
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/*
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* Since we ignore a formatting argument it is no
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* longer safe to obey the remaining formatting
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* arguments as the arguments will no longer match
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* the format specs.
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*/
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stop = 1;
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break;
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}
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}
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#undef PCHAR
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}
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