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97d40d3d4a
us up to version 2.17.50.20070703, at the last GPLv2 commit. Amongst others, this added upstream support for some FreeBSD-specific things that we previously had to manually hack in, such as the OSABI label support, and so on. There are also quite a number of new files, some for cpu's (e.g. SPU) that we may or may not be interested in, but those can be cleaned up later on, if needed.
246 lines
5.3 KiB
C
246 lines
5.3 KiB
C
/* sb.c - string buffer manipulation routines
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Copyright 1994, 1995, 2000, 2003, 2006 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 2, 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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/* 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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static int dsize = 5;
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static void sb_check (sb *, int);
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/* Statistics of sb structures. */
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static int string_count[sb_max_power_two];
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/* Free list of sb structures. */
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static struct
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{
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sb_element *size[sb_max_power_two];
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} free_list;
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/* Initializes an sb. */
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static void
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sb_build (sb *ptr, int size)
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{
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/* See if we can find one to allocate. */
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sb_element *e;
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assert (size < sb_max_power_two);
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e = free_list.size[size];
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if (!e)
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{
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/* Nothing there, allocate one and stick into the free list. */
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e = (sb_element *) xmalloc (sizeof (sb_element) + (1 << size));
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e->next = free_list.size[size];
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e->size = 1 << size;
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free_list.size[size] = e;
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string_count[size]++;
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}
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/* Remove from free list. */
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free_list.size[size] = e->next;
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/* Copy into callers world. */
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ptr->ptr = e->data;
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ptr->pot = size;
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ptr->len = 0;
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ptr->item = e;
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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, dsize);
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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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/* Return item to free list. */
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ptr->item->next = free_list.size[ptr->pot];
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free_list.size[ptr->pot] = ptr->item;
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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 int
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scrub_from_sb (char *buf, int buflen)
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{
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int 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, int len)
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{
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if (ptr->len + len >= 1 << ptr->pot)
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{
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sb tmp;
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int pot = ptr->pot;
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while (ptr->len + len >= 1 << pot)
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pot++;
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sb_build (&tmp, pot);
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sb_add_sb (&tmp, ptr);
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sb_kill (ptr);
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*ptr = tmp;
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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, int 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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int 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, int 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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/* Like sb_name, but don't include the null byte in the string. */
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char *
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sb_terminate (sb *in)
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{
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sb_add_char (in, 0);
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--in->len;
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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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int
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sb_skip_white (int 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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int
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sb_skip_comma (int 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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