gas/sb.c

   1 /* sb.c - string buffer manipulation routines
   2    Copyright 1994, 1995, 2000 Free Software Foundation, Inc.
   3
   4    Written by Steve and Judy Chamberlain of Cygnus Support,
   5       sac@cygnus.com
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  22    02111-1307, USA.  */
  23
  24 #include "config.h"
  25 #include <stdio.h>
  26 #ifdef HAVE_STDLIB_H
  27 #include <stdlib.h>
  28 #endif
  29 #ifdef HAVE_STRING_H
  30 #include <string.h>
  31 #else
  32 #include <strings.h>
  33 #endif
  34 #include "libiberty.h"
  35 #include "sb.h"
  36
  37 /* These routines are about manipulating strings.
  38
  39    They are managed in things called `sb's which is an abbreviation
  40    for string buffers.  An sb has to be created, things can be glued
  41    on to it, and at the end of it's life it should be freed.  The
  42    contents should never be pointed at whilst it is still growing,
  43    since it could be moved at any time
  44
  45    eg:
  46    sb_new (&foo);
  47    sb_grow... (&foo,...);
  48    use foo->ptr[*];
  49    sb_kill (&foo);
  50
  51 */
  52
  53 #define dsize 5
  54
  55 static void sb_check PARAMS ((sb *, int));
  56
  57 /* Statistics of sb structures.  */
  58
  59 int string_count[sb_max_power_two];
  60
  61 /* Free list of sb structures.  */
  62
  63 static sb_list_vector free_list;
  64
  65 /* initializes an sb.  */
  66
  67 void
  68 sb_build (ptr, size)
  69      sb *ptr;
  70      int size;
  71 {
  72   /* see if we can find one to allocate */
  73   sb_element *e;
  74
  75   if (size > sb_max_power_two)
  76     abort ();
  77
  78   e = free_list.size[size];
  79   if (!e)
  80     {
  81       /* nothing there, allocate one and stick into the free list */
  82       e = (sb_element *) xmalloc (sizeof (sb_element) + (1 << size));
  83       e->next = free_list.size[size];
  84       e->size = 1 << size;
  85       free_list.size[size] = e;
  86       string_count[size]++;
  87     }
  88
  89   /* remove from free list */
  90
  91   free_list.size[size] = e->next;
  92
  93   /* copy into callers world */
  94   ptr->ptr = e->data;
  95   ptr->pot = size;
  96   ptr->len = 0;
  97   ptr->item = e;
  98 }
  99
 100 void
 101 sb_new (ptr)
 102      sb *ptr;
 103 {
 104   sb_build (ptr, dsize);
 105 }
 106
 107 /* deallocate the sb at ptr */
 108
 109 void
 110 sb_kill (ptr)
 111      sb *ptr;
 112 {
 113   /* return item to free list */
 114   ptr->item->next = free_list.size[ptr->pot];
 115   free_list.size[ptr->pot] = ptr->item;
 116 }
 117
 118 /* add the sb at s to the end of the sb at ptr */
 119
 120 void
 121 sb_add_sb (ptr, s)
 122      sb *ptr;
 123      sb *s;
 124 {
 125   sb_check (ptr, s->len);
 126   memcpy (ptr->ptr + ptr->len, s->ptr, s->len);
 127   ptr->len += s->len;
 128 }
 129
 130 /* make sure that the sb at ptr has room for another len characters,
 131    and grow it if it doesn't.  */
 132
 133 static void
 134 sb_check (ptr, len)
 135      sb *ptr;
 136      int len;
 137 {
 138   if (ptr->len + len >= 1 << ptr->pot)
 139     {
 140       sb tmp;
 141       int pot = ptr->pot;
 142       while (ptr->len + len >= 1 << pot)
 143         pot++;
 144       sb_build (&tmp, pot);
 145       sb_add_sb (&tmp, ptr);
 146       sb_kill (ptr);
 147       *ptr = tmp;
 148     }
 149 }
 150
 151 /* make the sb at ptr point back to the beginning.  */
 152
 153 void
 154 sb_reset (ptr)
 155      sb *ptr;
 156 {
 157   ptr->len = 0;
 158 }
 159
 160 /* add character c to the end of the sb at ptr.  */
 161
 162 void
 163 sb_add_char (ptr, c)
 164      sb *ptr;
 165      int c;
 166 {
 167   sb_check (ptr, 1);
 168   ptr->ptr[ptr->len++] = c;
 169 }
 170
 171 /* add null terminated string s to the end of sb at ptr.  */
 172
 173 void
 174 sb_add_string (ptr, s)
 175      sb *ptr;
 176      const char *s;
 177 {
 178   int len = strlen (s);
 179   sb_check (ptr, len);
 180   memcpy (ptr->ptr + ptr->len, s, len);
 181   ptr->len += len;
 182 }
 183
 184 /* add string at s of length len to sb at ptr */
 185
 186 void
 187 sb_add_buffer (ptr, s, len)
 188      sb *ptr;
 189      const char *s;
 190      int len;
 191 {
 192   sb_check (ptr, len);
 193   memcpy (ptr->ptr + ptr->len, s, len);
 194   ptr->len += len;
 195 }
 196
 197 /* print the sb at ptr to the output file */
 198
 199 void
 200 sb_print (outfile, ptr)
 201      FILE *outfile;
 202      sb *ptr;
 203 {
 204   int i;
 205   int nc = 0;
 206
 207   for (i = 0; i < ptr->len; i++)
 208     {
 209       if (nc)
 210         {
 211           fprintf (outfile, ",");
 212         }
 213       fprintf (outfile, "%d", ptr->ptr[i]);
 214       nc = 1;
 215     }
 216 }
 217
 218 void
 219 sb_print_at (outfile, idx, ptr)
 220      FILE *outfile;
 221      int idx;
 222      sb *ptr;
 223 {
 224   int i;
 225   for (i = idx; i < ptr->len; i++)
 226     putc (ptr->ptr[i], outfile);
 227 }
 228
 229 /* put a null at the end of the sb at in and return the start of the
 230    string, so that it can be used as an arg to printf %s.  */
 231
 232 char *
 233 sb_name (in)
 234      sb *in;
 235 {
 236   /* stick a null on the end of the string */
 237   sb_add_char (in, 0);
 238   return in->ptr;
 239 }
 240
 241 /* like sb_name, but don't include the null byte in the string.  */
 242
 243 char *
 244 sb_terminate (in)
 245      sb *in;
 246 {
 247   sb_add_char (in, 0);
 248   --in->len;
 249   return in->ptr;
 250 }
 251
 252 /* start at the index idx into the string in sb at ptr and skip
 253    whitespace. return the index of the first non whitespace character */
 254
 255 int
 256 sb_skip_white (idx, ptr)
 257      int idx;
 258      sb *ptr;
 259 {
 260   while (idx < ptr->len
 261          && (ptr->ptr[idx] == ' '
 262              || ptr->ptr[idx] == '\t'))
 263     idx++;
 264   return idx;
 265 }
 266
 267 /* start at the index idx into the sb at ptr. skips whitespace,
 268    a comma and any following whitespace. returns the index of the
 269    next character.  */
 270
 271 int
 272 sb_skip_comma (idx, ptr)
 273      int idx;
 274      sb *ptr;
 275 {
 276   while (idx < ptr->len
 277          && (ptr->ptr[idx] == ' '
 278              || ptr->ptr[idx] == '\t'))
 279     idx++;
 280
 281   if (idx < ptr->len
 282       && ptr->ptr[idx] == ',')
 283     idx++;
 284
 285   while (idx < ptr->len
 286          && (ptr->ptr[idx] == ' '
 287              || ptr->ptr[idx] == '\t'))
 288     idx++;
 289
 290   return idx;
 291 }