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8860a416a2
This increases consistancy of how we allocate memory, and always casting the result to the proper type. It also helps make sure we get any use of sizeof on the result type correct. gas/ChangeLog: 2016-03-22 Trevor Saunders <tbsaunde+binutils@tbsaunde.org> * listing.c (listing_message): Use XNEW style allocation macros. * read.c (read_a_source_file): Likewise. (read_symbol_name): Likewise. (s_mri_common): Likewise. (assign_symbol): Likewise. (s_reloc): Likewise. (emit_expr_with_reloc): Likewise. (s_incbin): Likewise. (s_include): Likewise. * sb.c (sb_build): Likewise. (sb_check): Likewise.
237 lines
5.2 KiB
C
237 lines
5.2 KiB
C
/* sb.c - string buffer manipulation routines
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Copyright (C) 1994-2016 Free Software Foundation, Inc.
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Written by Steve and Judy Chamberlain of Cygnus Support,
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sac@cygnus.com
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "as.h"
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#include "sb.h"
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifndef CHAR_BIT
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#define CHAR_BIT 8
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#endif
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/* These routines are about manipulating strings.
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They are managed in things called `sb's which is an abbreviation
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for string buffers. An sb has to be created, things can be glued
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on to it, and at the end of it's life it should be freed. The
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contents should never be pointed at whilst it is still growing,
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since it could be moved at any time
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eg:
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sb_new (&foo);
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sb_grow... (&foo,...);
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use foo->ptr[*];
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sb_kill (&foo); */
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/* Buffers start at INIT_ALLOC size, and roughly double each time we
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go over the current allocation. MALLOC_OVERHEAD is a guess at the
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system malloc overhead. We aim to not waste any memory in the
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underlying page/chunk allocated by the system malloc. */
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#define MALLOC_OVERHEAD (2 * sizeof (size_t))
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#define INIT_ALLOC (64 - MALLOC_OVERHEAD - 1)
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static void sb_check (sb *, size_t);
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/* Initializes an sb. */
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void
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sb_build (sb *ptr, size_t size)
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{
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ptr->ptr = XNEWVEC (char, size + 1);
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ptr->max = size;
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ptr->len = 0;
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}
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void
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sb_new (sb *ptr)
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{
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sb_build (ptr, INIT_ALLOC);
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}
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/* Deallocate the sb at ptr. */
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void
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sb_kill (sb *ptr)
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{
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free (ptr->ptr);
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}
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/* Add the sb at s to the end of the sb at ptr. */
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void
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sb_add_sb (sb *ptr, sb *s)
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{
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sb_check (ptr, s->len);
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memcpy (ptr->ptr + ptr->len, s->ptr, s->len);
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ptr->len += s->len;
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}
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/* Helper for sb_scrub_and_add_sb. */
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static sb *sb_to_scrub;
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static char *scrub_position;
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static size_t
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scrub_from_sb (char *buf, size_t buflen)
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{
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size_t copy;
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copy = sb_to_scrub->len - (scrub_position - sb_to_scrub->ptr);
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if (copy > buflen)
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copy = buflen;
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memcpy (buf, scrub_position, copy);
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scrub_position += copy;
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return copy;
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}
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/* Run the sb at s through do_scrub_chars and add the result to the sb
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at ptr. */
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void
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sb_scrub_and_add_sb (sb *ptr, sb *s)
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{
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sb_to_scrub = s;
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scrub_position = s->ptr;
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sb_check (ptr, s->len);
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ptr->len += do_scrub_chars (scrub_from_sb, ptr->ptr + ptr->len, s->len);
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sb_to_scrub = 0;
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scrub_position = 0;
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}
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/* Make sure that the sb at ptr has room for another len characters,
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and grow it if it doesn't. */
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static void
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sb_check (sb *ptr, size_t len)
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{
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size_t want = ptr->len + len;
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if (want > ptr->max)
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{
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size_t max;
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want += MALLOC_OVERHEAD + 1;
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if ((ssize_t) want < 0)
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as_fatal ("string buffer overflow");
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#if GCC_VERSION >= 3004
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max = (size_t) 1 << (CHAR_BIT * sizeof (want)
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- (sizeof (want) <= sizeof (long)
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? __builtin_clzl ((long) want)
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: __builtin_clzll ((long long) want)));
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#else
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max = 128;
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while (want > max)
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max <<= 1;
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#endif
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max -= MALLOC_OVERHEAD + 1;
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ptr->max = max;
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ptr->ptr = XRESIZEVEC (char, ptr->ptr, max + 1);
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}
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}
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/* Make the sb at ptr point back to the beginning. */
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void
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sb_reset (sb *ptr)
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{
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ptr->len = 0;
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}
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/* Add character c to the end of the sb at ptr. */
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void
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sb_add_char (sb *ptr, size_t c)
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{
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sb_check (ptr, 1);
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ptr->ptr[ptr->len++] = c;
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}
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/* Add null terminated string s to the end of sb at ptr. */
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void
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sb_add_string (sb *ptr, const char *s)
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{
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size_t len = strlen (s);
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sb_check (ptr, len);
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memcpy (ptr->ptr + ptr->len, s, len);
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ptr->len += len;
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}
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/* Add string at s of length len to sb at ptr */
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void
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sb_add_buffer (sb *ptr, const char *s, size_t len)
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{
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sb_check (ptr, len);
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memcpy (ptr->ptr + ptr->len, s, len);
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ptr->len += len;
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}
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/* Write terminating NUL and return string. */
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char *
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sb_terminate (sb *in)
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{
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in->ptr[in->len] = 0;
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return in->ptr;
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}
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/* Start at the index idx into the string in sb at ptr and skip
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whitespace. return the index of the first non whitespace character. */
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size_t
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sb_skip_white (size_t idx, sb *ptr)
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{
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while (idx < ptr->len
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&& (ptr->ptr[idx] == ' '
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|| ptr->ptr[idx] == '\t'))
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idx++;
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return idx;
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}
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/* Start at the index idx into the sb at ptr. skips whitespace,
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a comma and any following whitespace. returns the index of the
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next character. */
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size_t
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sb_skip_comma (size_t idx, sb *ptr)
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{
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while (idx < ptr->len
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&& (ptr->ptr[idx] == ' '
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|| ptr->ptr[idx] == '\t'))
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idx++;
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if (idx < ptr->len
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&& ptr->ptr[idx] == ',')
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idx++;
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while (idx < ptr->len
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&& (ptr->ptr[idx] == ' '
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|| ptr->ptr[idx] == '\t'))
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idx++;
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return idx;
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}
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