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/* __gmp_snprintf_funs -- support for gmp_snprintf and gmp_vsnprintf.
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THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST
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CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
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FUTURE GNU MP RELEASES.
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Copyright 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#if ! HAVE_VSNPRINTF
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#define vsnprintf __gmp_replacement_vsnprintf
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#endif
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/* glibc 2.0.x vsnprintf returns either -1 or size-1 for an overflow, with
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no indication how big the output would have been. It's necessary to
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re-run to determine that size.
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"size-1" would mean success from a C99 vsnprintf, and the re-run is
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unnecessary in this case, but we don't bother to try to detect what sort
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of vsnprintf we've got. size-1 should occur rarely in normal
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circumstances.
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vsnprintf might trash it's given ap (it does for instance in glibc 2.1.3
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on powerpc), so copy it in case we need to use it to probe for the size
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output that would have been produced. Note there's no need to preserve
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it for our callers, just for ourselves. */
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static int
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gmp_snprintf_format (struct gmp_snprintf_t *d, const char *fmt,
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va_list orig_ap)
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{
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int ret, step, alloc, avail;
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va_list ap;
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char *p;
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ASSERT (d->size >= 0);
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avail = d->size;
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if (avail > 1)
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{
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va_copy (ap, orig_ap);
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ret = vsnprintf (d->buf, avail, fmt, ap);
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if (ret == -1)
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{
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ASSERT (strlen (d->buf) == avail-1);
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ret = avail-1;
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}
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step = MIN (ret, avail-1);
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d->size -= step;
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d->buf += step;
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if (ret != avail-1)
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return ret;
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/* probably glibc 2.0.x truncated output, probe for actual size */
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alloc = MAX (128, ret);
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}
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else
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{
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/* no space to write anything, just probe for size */
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alloc = 128;
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}
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do
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{
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alloc *= 2;
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p = __GMP_ALLOCATE_FUNC_TYPE (alloc, char);
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va_copy (ap, orig_ap);
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ret = vsnprintf (p, alloc, fmt, ap);
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(*__gmp_free_func) (p, alloc);
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}
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while (ret == alloc-1 || ret == -1);
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return ret;
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}
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static int
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gmp_snprintf_memory (struct gmp_snprintf_t *d, const char *str, size_t len)
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{
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size_t n;
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ASSERT (d->size >= 0);
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if (d->size > 1)
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{
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n = MIN (d->size-1, len);
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memcpy (d->buf, str, n);
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d->buf += n;
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d->size -= n;
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}
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return len;
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}
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static int
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gmp_snprintf_reps (struct gmp_snprintf_t *d, int c, int reps)
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{
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size_t n;
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ASSERT (reps >= 0);
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ASSERT (d->size >= 0);
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if (d->size > 1)
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{
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n = MIN (d->size-1, reps);
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memset (d->buf, c, n);
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d->buf += n;
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d->size -= n;
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}
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return reps;
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}
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static int
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gmp_snprintf_final (struct gmp_snprintf_t *d)
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{
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if (d->size >= 1)
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d->buf[0] = '\0';
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return 0;
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}
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const struct doprnt_funs_t __gmp_snprintf_funs = {
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(doprnt_format_t) gmp_snprintf_format,
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(doprnt_memory_t) gmp_snprintf_memory,
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(doprnt_reps_t) gmp_snprintf_reps,
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(doprnt_final_t) gmp_snprintf_final
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};
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