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|
/* Keep a unique copy of strings.
Copyright (C) 2002-2005, 2009-2015, 2018-2021 Free Software
Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "system.h"
#include <attribute.h>
#include <error.h>
#include <hash.h>
#include <quotearg.h>
#include <stdarg.h>
#include "uniqstr.h"
/*-----------------------.
| A uniqstr hash table. |
`-----------------------*/
/* Initial capacity of uniqstr hash table. */
#define HT_INITIAL_CAPACITY 257
static struct hash_table *uniqstrs_table = NULL;
/*-------------------------------------.
| Create the uniqstr for S if needed. |
`-------------------------------------*/
uniqstr
uniqstr_new (char const *str)
{
uniqstr res = hash_lookup (uniqstrs_table, str);
if (!res)
{
/* First insertion in the hash. */
res = xstrdup (str);
hash_xinsert (uniqstrs_table, res);
}
return res;
}
uniqstr
uniqstr_concat (int nargs, ...)
{
va_list args;
va_start (args, nargs);
size_t reslen = 0;
for (int i = 0; i < nargs; i++)
reslen += strlen (va_arg (args, char const *));
va_end (args);
char *str = xmalloc (reslen + 1);
char *p = str;
va_start (args, nargs);
for (int i = 0; i < nargs; i++)
{
char const *arg = va_arg (args, char const *);
size_t arglen = strlen (arg);
memcpy (p, arg, arglen);
p += arglen;
}
va_end (args);
*p = '\0';
uniqstr res = hash_xinsert (uniqstrs_table, str);
if (res != str)
free (str);
return res;
}
/*------------------------------.
| Abort if S is not a uniqstr. |
`------------------------------*/
void
uniqstr_assert (char const *str)
{
uniqstr s = hash_lookup (uniqstrs_table, str);
if (!s || s != str)
{
error (0, 0,
"not a uniqstr: %s", quotearg (str));
abort ();
}
}
/*--------------------.
| Print the uniqstr. |
`--------------------*/
static inline bool
uniqstr_print (uniqstr ustr)
{
fprintf (stderr, "%s\n", ustr);
return true;
}
static bool
uniqstr_print_processor (void *ustr, void *null MAYBE_UNUSED)
{
return uniqstr_print (ustr);
}
int
uniqstr_cmp (uniqstr l, uniqstr r)
{
return (l == r ? 0
: !l ? -1
: !r ? +1
: strcmp (l, r));
}
/*-----------------------.
| A uniqstr hash table. |
`-----------------------*/
static bool
hash_compare_uniqstr (void const *m1, void const *m2)
{
return STREQ (m1, m2);
}
static size_t
hash_uniqstr (void const *m, size_t tablesize)
{
return hash_string (m, tablesize);
}
/*----------------------------.
| Create the uniqstrs table. |
`----------------------------*/
void
uniqstrs_new (void)
{
uniqstrs_table = hash_xinitialize (HT_INITIAL_CAPACITY,
NULL,
hash_uniqstr,
hash_compare_uniqstr,
free);
}
/*-------------------------------------.
| Perform a task on all the uniqstrs. |
`-------------------------------------*/
static void
uniqstrs_do (Hash_processor processor, void *processor_data)
{
hash_do_for_each (uniqstrs_table, processor, processor_data);
}
/*-----------------.
| Print them all. |
`-----------------*/
void
uniqstrs_print (void)
{
uniqstrs_do (uniqstr_print_processor, NULL);
}
/*--------------------.
| Free the uniqstrs. |
`--------------------*/
void
uniqstrs_free (void)
{
hash_free (uniqstrs_table);
}
|
