nasmlib/strlist.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2018 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * strlist.c - list of unique, ordered strings
  36  */
  37
  38 #include "strlist.h"
  39
  40 /*
  41  * Create a string list
  42  */
  43 struct strlist *strlist_alloc(void)
  44 {
  45         struct strlist *list = nasm_zalloc(sizeof(*list));
  46         hash_init(&list->hash, HASH_MEDIUM);
  47         list->tailp = &list->head;
  48         return list;
  49 }
  50
  51 /*
  52  * Append a string to a string list if and only if it isn't
  53  * already there.  Return true if it was added.
  54  */
  55 bool strlist_add(struct strlist *list, const char *str)
  56 {
  57         struct strlist_entry *e;
  58         struct hash_insert hi;
  59         size_t len;
  60
  61         if (!list)
  62                 return false;
  63
  64         if (hash_find(&list->hash, str, &hi))
  65                 return false;
  66
  67         len = strlen(str);
  68
  69         /* Structure already has char[1] as EOS */
  70         e = nasm_zalloc(sizeof(*e) + len);
  71         e->len = len;
  72         memcpy(e->str, str, len + 1);
  73
  74         *list->tailp = e;
  75         list->tailp = &e->next;
  76
  77         hash_add(&hi, e->str, (void *)e);
  78         return true;
  79 }
  80
  81 /*
  82  * Free a string list
  83  */
  84 void strlist_free(struct strlist *list)
  85 {
  86         if (list) {
  87                 hash_free_all(&list->hash, false);
  88                 nasm_free(list);
  89         }
  90 }