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* Copyright (c) 1999-2005, 2008, 2010-2011
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* Todd C. Miller <Todd.Miller@courtesan.com>
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* This code is derived from software contributed to Berkeley by
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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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* 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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* 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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* From: @(#)vfprintf.c 8.1 (Berkeley) 6/4/93
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* v?snprintf/v?asprintf based on 4.4BSD stdio.
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* NOTE: does not support floating point.
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#include <sys/types.h>
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#include <sys/param.h>
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#endif /* STDC_HEADERS */
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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#endif /* HAVE_STRING_H */
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#endif /* HAVE_STRINGS_H */
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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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static int xxxprintf(char **, size_t, int, const char *, va_list);
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* Some systems may not have these defined in <limits.h>
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# define ULONG_MAX ((unsigned long)-1)
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# define LONG_MAX (ULONG_MAX / 2)
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#ifdef HAVE_LONG_LONG_INT
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# define ULLONG_MAX UQUAD_MAX
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# define ULLONG_MAX ((unsigned long long)-1)
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# define LLONG_MAX QUAD_MAX
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# define LLONG_MAX (ULLONG_MAX / 2)
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#endif /* HAVE_LONG_LONG_INT */
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* Macros for converting digits to letters and vice versa
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#define to_digit(c) ((c) - '0')
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#define is_digit(c) ((unsigned int)to_digit(c) <= 9)
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#define to_char(n) ((n) + '0')
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* Flags used during conversion.
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#define ALT 0x001 /* alternate form */
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#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
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#define LADJUST 0x004 /* left adjustment */
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#define LONGDBL 0x008 /* long double; unimplemented */
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#define LONGINT 0x010 /* long integer */
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#define QUADINT 0x020 /* quad integer */
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#define SHORTINT 0x040 /* short integer */
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#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
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* Convert an unsigned long to ASCII for printf purposes, returning
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* a pointer to the first character of the string representation.
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* Octal numbers can be forced to have a leading zero; hex numbers
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* use the given digits.
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__ultoa(unsigned long val, char *endp, int base, int octzero, char *xdigs)
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* Handle the three cases separately, in the hope of getting
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* better/faster code.
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if (val < 10) { /* many numbers are 1 digit */
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*--cp = to_char(val);
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* On many machines, unsigned arithmetic is harder than
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* signed arithmetic, so we do at most one unsigned mod and
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* divide; this is sufficient to reduce the range of
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* the incoming value to where signed arithmetic works.
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if (val > LONG_MAX) {
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*--cp = to_char(val % 10);
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*--cp = to_char(sval % 10);
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*--cp = to_char(val & 7);
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if (octzero && *cp != '0')
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*--cp = xdigs[val & 15];
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/* Identical to __ultoa, but for quads. */
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#ifdef HAVE_LONG_LONG_INT
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# if SIZEOF_LONG_INT == 8
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# define __uqtoa(v, e, b, o, x) __ultoa((unsigned long)(v), (e), (b), (o), (x))
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__uqtoa(unsigned long long val, char *endp, int base, int octzero, char *xdigs)
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/* quick test for small values; __ultoa is typically much faster */
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/* (perhaps instead we should run until small, then call __ultoa?) */
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if (val <= (unsigned long long)ULONG_MAX)
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return __ultoa((unsigned long)val, endp, base, octzero, xdigs);
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*--cp = to_char(val % 10);
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if (val > LLONG_MAX) {
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*--cp = to_char(val % 10);
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*--cp = to_char(sval % 10);
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*--cp = to_char(val & 7);
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if (octzero && *cp != '0')
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*--cp = xdigs[val & 15];
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# endif /* !SIZEOF_LONG_INT */
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#endif /* HAVE_LONG_LONG_INT */
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* Actual printf innards.
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xxxprintf(char **strp, size_t strsize, int alloc, const char *fmt0, va_list ap)
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char *fmt; /* format string */
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int ch; /* character from fmt */
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int n; /* handy integer (short term usage) */
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char *cp; /* handy char pointer (short term usage) */
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int flags; /* flags as above */
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int ret; /* return value accumulator */
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int width; /* width from format (%8d), or 0 */
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int prec; /* precision from format (%.3d), or -1 */
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char sign; /* sign prefix (' ', '+', '-', or \0) */
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unsigned long ulval = 0; /* integer arguments %[diouxX] */
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#ifdef HAVE_LONG_LONG_INT
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unsigned long long uqval = 0; /* %q (quad) integers */
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int base; /* base for [diouxX] conversion */
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int dprec; /* a copy of prec if [diouxX], 0 otherwise */
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int fieldsz; /* field size expanded by sign, etc */
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int realsz; /* field size expanded by dprec */
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int size; /* size of converted field or string */
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char *xdigs = ""; /* digits for [xX] conversion */
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char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
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char ox[2]; /* space for 0x hex-prefix */
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char *str; /* pointer to string to fill */
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char *estr; /* pointer to last char in str */
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* Choose PADSIZE to trade efficiency vs. size. If larger printf
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* fields occur frequently, increase PADSIZE and make the initialisers
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#define PADSIZE 16 /* pad chunk size */
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static char blanks[PADSIZE] =
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{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
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static char zeroes[PADSIZE] =
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{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
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/* Print chars to "str", (allocate as needed if alloc is set). */
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#define PRINT(ptr, len) do { \
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const char *p = ptr; \
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const char *endp = ptr + len; \
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while (p < endp && (str < estr || alloc)) { \
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if (alloc && str >= estr) { \
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strsize = (strsize << 1) + 1; \
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if (!(t = (char *)realloc(*strp, strsize))) { \
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str = t + (str - *strp); \
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estr = t + strsize - 1; \
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/* BEWARE, PAD uses `n'. */
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#define PAD(plen, pstr) do { \
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if ((n = (plen)) > 0) { \
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while (n > PADSIZE) { \
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PRINT(pstr, PADSIZE); \
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* To extend shorts properly, we need both signed and unsigned
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* argument extraction methods.
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(flags&LONGINT ? va_arg(ap, long) : \
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flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
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(long)va_arg(ap, int))
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(flags&LONGINT ? va_arg(ap, unsigned long) : \
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flags&SHORTINT ? (unsigned long)(unsigned short)va_arg(ap, int) : \
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(unsigned long)va_arg(ap, unsigned int))
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*strp = str = (char *)malloc(strsize);
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estr = str + strsize - 1;
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* Scan the format for conversions (`%' character).
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for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
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if ((n = fmt - cp) != 0) {
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fmt++; /* skip over '%' */
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reswitch: switch (ch) {
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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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* ``A negative field width argument is taken as a
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* - flag followed by a positive field width.''
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* They don't exclude field widths read from args.
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if ((width = va_arg(ap, int)) >= 0)
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if ((ch = *fmt++) == '*') {
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prec = n < 0 ? -1 : n;
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while (is_digit(ch)) {
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n = 10 * n + to_digit(ch);
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prec = n < 0 ? -1 : n;
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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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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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n = 10 * n + to_digit(ch);
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} while (is_digit(ch));
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#ifdef HAVE_LONG_LONG_INT
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#endif /* HAVE_LONG_LONG_INT */
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*(cp = buf) = va_arg(ap, int);
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#ifdef HAVE_LONG_LONG_INT
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if (flags & QUADINT) {
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uqval = va_arg(ap, long long);
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if ((long long)uqval < 0) {
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#endif /* HAVE_LONG_LONG_INT */
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if ((long)ulval < 0) {
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#ifdef HAVE_LONG_LONG_INT
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*va_arg(ap, long long *) = ret;
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#endif /* HAVE_LONG_LONG_INT */
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*va_arg(ap, long *) = ret;
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else if (flags & SHORTINT)
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*va_arg(ap, short *) = ret;
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*va_arg(ap, int *) = ret;
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continue; /* no output */
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#ifdef HAVE_LONG_LONG_INT
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uqval = va_arg(ap, unsigned long long);
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#endif /* HAVE_LONG_LONG_INT */
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* ``The argument shall be a pointer to void. The
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* value of the pointer is converted to a sequence
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* of printable characters, in an implementation-
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ulval = (unsigned long)va_arg(ap, void *);
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xdigs = "0123456789abcdef";
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flags = (flags & ~QUADINT) | HEXPREFIX;
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if ((cp = va_arg(ap, char *)) == NULL)
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* can't use strlen; can only look for the
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* NUL in the first `prec' characters, and
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* strlen() will go further.
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char *p = memchr(cp, 0, prec);
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#ifdef HAVE_LONG_LONG_INT
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uqval = va_arg(ap, unsigned long long);
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#endif /* HAVE_LONG_LONG_INT */
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xdigs = "0123456789ABCDEF";
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xdigs = "0123456789abcdef";
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#ifdef HAVE_LONG_LONG_INT
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uqval = va_arg(ap, unsigned long long);
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#endif /* HAVE_LONG_LONG_INT */
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/* leading 0x/X only if non-zero */
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#ifdef HAVE_LONG_LONG_INT
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(flags & QUADINT ? uqval != 0 : ulval != 0))
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#endif /* HAVE_LONG_LONG_INT */
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/* unsigned conversions */
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* ``... diouXx conversions ... if a precision is
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* specified, the 0 flag will be ignored.''
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number: if ((dprec = prec) >= 0)
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* ``The result of converting a zero value with an
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* explicit precision of zero is no characters.''
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#ifdef HAVE_LONG_LONG_INT
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if (flags & QUADINT) {
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if (uqval != 0 || prec != 0)
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cp = __uqtoa(uqval, cp, base,
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#endif /* HAVE_LONG_LONG_INT */
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if (ulval != 0 || prec != 0)
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cp = __ultoa(ulval, cp, base,
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size = buf + BUF - cp;
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default: /* "%?" prints ?, unless ? is NUL */
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/* pretend it was %c with argument ch */
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* All reasonable formats wind up here. At this point, `cp'
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* points to a string which (if not flags&LADJUST) should be
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* padded out to `width' places. If flags&ZEROPAD, it should
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* first be prefixed by any sign or other prefix; otherwise,
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* it should be blank padded before the prefix is emitted.
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* After any left-hand padding and prefixing, emit zeroes
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* required by a decimal [diouxX] precision, then print the
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* string proper, then emit zeroes required by any leftover
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* floating precision; finally, if LADJUST, pad with blanks.
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* Compute actual size, so we know how much to pad.
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* fieldsz excludes decimal prec; realsz includes it.
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else if (flags & HEXPREFIX)
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realsz = dprec > fieldsz ? dprec : fieldsz;
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/* right-adjusting blank padding */
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if ((flags & (LADJUST|ZEROPAD)) == 0)
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PAD(width - realsz, blanks);
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} else if (flags & HEXPREFIX) {
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/* right-adjusting zero padding */
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if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
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PAD(width - realsz, zeroes);
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/* leading zeroes from decimal precision */
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PAD(dprec - fieldsz, zeroes);
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/* the string or number proper */
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/* left-adjusting padding (always blank) */
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PAD(width - realsz, blanks);
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/* finally, adjust ret */
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ret += width > realsz ? width : realsz;
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#ifndef HAVE_VSNPRINTF
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vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
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return xxxprintf(&str, n, 0, fmt, ap);
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#endif /* HAVE_VSNPRINTF */
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#ifndef HAVE_SNPRINTF
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snprintf(char *str, size_t n, char const *fmt, ...)
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ret = xxxprintf(&str, n, 0, fmt, ap);
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#endif /* HAVE_SNPRINTF */
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#ifndef HAVE_VASPRINTF
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vasprintf(char **str, const char *fmt, va_list ap)
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return xxxprintf(str, 0, 1, fmt, ap);
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#endif /* HAVE_VASPRINTF */
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#ifndef HAVE_ASPRINTF
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asprintf(char **str, char const *fmt, ...)
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ret = xxxprintf(str, 0, 1, fmt, ap);
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#endif /* HAVE_ASPRINTF */
added
removed
compat/snprintf.c
