19990502 sourceware importbinu_ss_19990502

1 files changed, 289 insertions, 0 deletions

diff --git a/gas/sb.c b/gas/sb.c
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+/* sb.c - string buffer manipulation routines
+   Copyright (C) 1994, 1995 Free Software Foundation, Inc.
+
+   Written by Steve and Judy Chamberlain of Cygnus Support,
+      sac@cygnus.com
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   GAS is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GAS; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA. */
+
+#include "config.h"
+#include <stdio.h>
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#include <strings.h>
+#endif
+#include "libiberty.h"
+#include "sb.h"
+
+/* These routines are about manipulating strings.
+
+   They are managed in things called `sb's which is an abbreviation
+   for string buffers.  An sb has to be created, things can be glued
+   on to it, and at the end of it's life it should be freed.  The
+   contents should never be pointed at whilst it is still growing,
+   since it could be moved at any time
+
+   eg:
+   sb_new (&foo);
+   sb_grow... (&foo,...);
+   use foo->ptr[*];
+   sb_kill (&foo);
+
+*/
+
+#define dsize 5
+
+static void sb_check PARAMS ((sb *, int));
+
+/* Statistics of sb structures.  */
+
+int string_count[sb_max_power_two];
+
+/* Free list of sb structures.  */
+
+static sb_list_vector free_list;
+
+/* initializes an sb. */
+
+void
+sb_build (ptr, size)
+     sb *ptr;
+     int size;
+{
+  /* see if we can find one to allocate */
+  sb_element *e;
+
+  if (size > sb_max_power_two)
+    abort ();
+
+  e = free_list.size[size];
+  if (!e)
+    {
+      /* nothing there, allocate one and stick into the free list */
+      e = (sb_element *) xmalloc (sizeof (sb_element) + (1 << size));
+      e->next = free_list.size[size];
+      e->size = 1 << size;
+      free_list.size[size] = e;
+      string_count[size]++;
+    }
+
+  /* remove from free list */
+
+  free_list.size[size] = e->next;
+
+  /* copy into callers world */
+  ptr->ptr = e->data;
+  ptr->pot = size;
+  ptr->len = 0;
+  ptr->item = e;
+}
+
+
+void
+sb_new (ptr)
+     sb *ptr;
+{
+  sb_build (ptr, dsize);
+}
+
+/* deallocate the sb at ptr */
+
+void
+sb_kill (ptr)
+     sb *ptr;
+{
+  /* return item to free list */
+  ptr->item->next = free_list.size[ptr->pot];
+  free_list.size[ptr->pot] = ptr->item;
+}
+
+/* add the sb at s to the end of the sb at ptr */
+
+void
+sb_add_sb (ptr, s)
+     sb *ptr;
+     sb *s;
+{
+  sb_check (ptr, s->len);
+  memcpy (ptr->ptr + ptr->len, s->ptr, s->len);
+  ptr->len += s->len;
+}
+
+/* make sure that the sb at ptr has room for another len characters,
+   and grow it if it doesn't. */
+
+static void
+sb_check (ptr, len)
+     sb *ptr;
+     int len;
+{
+  if (ptr->len + len >= 1 << ptr->pot)
+    {
+      sb tmp;
+      int pot = ptr->pot;
+      while (ptr->len + len >= 1 << pot)
+	pot++;
+      sb_build (&tmp, pot);
+      sb_add_sb (&tmp, ptr);
+      sb_kill (ptr);
+      *ptr = tmp;
+    }
+}
+
+/* make the sb at ptr point back to the beginning.  */
+
+void
+sb_reset (ptr)
+     sb *ptr;
+{
+  ptr->len = 0;
+}
+
+/* add character c to the end of the sb at ptr. */
+
+void
+sb_add_char (ptr, c)
+     sb *ptr;
+     int c;
+{
+  sb_check (ptr, 1);
+  ptr->ptr[ptr->len++] = c;
+}
+
+/* add null terminated string s to the end of sb at ptr. */
+
+void
+sb_add_string (ptr, s)
+     sb *ptr;
+     const char *s;
+{
+  int len = strlen (s);
+  sb_check (ptr, len);
+  memcpy (ptr->ptr + ptr->len, s, len);
+  ptr->len += len;
+}
+
+/* add string at s of length len to sb at ptr */
+
+void
+sb_add_buffer (ptr, s, len)
+     sb *ptr;
+     const char *s;
+     int len;
+{
+  sb_check (ptr, len);
+  memcpy (ptr->ptr + ptr->len, s, len);
+  ptr->len += len;
+}
+
+/* print the sb at ptr to the output file */
+
+void
+sb_print (outfile, ptr)
+     FILE *outfile;
+     sb *ptr;
+{
+  int i;
+  int nc = 0;
+
+  for (i = 0; i < ptr->len; i++)
+    {
+      if (nc)
+	{
+	  fprintf (outfile, ",");
+	}
+      fprintf (outfile, "%d", ptr->ptr[i]);
+      nc = 1;
+    }
+}
+
+void 
+sb_print_at (outfile, idx, ptr)
+     FILE *outfile;
+     int idx;
+     sb *ptr;
+{
+  int i;
+  for (i = idx; i < ptr->len; i++)
+    putc (ptr->ptr[i], outfile);
+}
+
+/* put a null at the end of the sb at in and return the start of the
+   string, so that it can be used as an arg to printf %s. */
+
+char *
+sb_name (in)
+     sb *in;
+{
+  /* stick a null on the end of the string */
+  sb_add_char (in, 0);
+  return in->ptr;
+}
+
+/* like sb_name, but don't include the null byte in the string.  */
+
+char *
+sb_terminate (in)
+     sb *in;
+{
+  sb_add_char (in, 0);
+  --in->len;
+  return in->ptr;
+}
+
+/* start at the index idx into the string in sb at ptr and skip
+   whitespace. return the index of the first non whitespace character */
+
+int
+sb_skip_white (idx, ptr)
+     int idx;
+     sb *ptr;
+{
+  while (idx < ptr->len
+	 && (ptr->ptr[idx] == ' '
+	     || ptr->ptr[idx] == '\t'))
+    idx++;
+  return idx;
+}
+
+/* start at the index idx into the sb at ptr. skips whitespace,
+   a comma and any following whitespace. returnes the index of the
+   next character. */
+
+int
+sb_skip_comma (idx, ptr)
+     int idx;
+     sb *ptr;
+{
+  while (idx < ptr->len
+	 && (ptr->ptr[idx] == ' '
+	     || ptr->ptr[idx] == '\t'))
+    idx++;
+
+  if (idx < ptr->len
+      && ptr->ptr[idx] == ',')
+    idx++;
+
+  while (idx < ptr->len
+	 && (ptr->ptr[idx] == ' '
+	     || ptr->ptr[idx] == '\t'))
+    idx++;
+
+  return idx;
+}