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/* Implement the SELECT statement for character variables.
Contributed by Andy Vaught
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfor 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.
Libgfor 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 libgfor; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "libgfortran.h"
typedef struct
{
char *low;
int low_len;
char *high;
int high_len;
void *address;
}
select_struct;
extern void * select_string (select_struct *table, int table_len,
void *default_jump, const char *selector,
int selector_len);
export_proto(select_string);
/* select_string()-- Given a selector string and a table of
* select_struct structures, return the address to jump to. */
void *
select_string (select_struct *table, int table_len, void *default_jump,
const char *selector, int selector_len)
{
select_struct *t;
int i, low, high, mid;
if (table_len == 0)
return default_jump;
/* Record the default address if present */
if (table->low == NULL && table->high == NULL)
{
default_jump = table->address;
table++;
table_len--;
if (table_len == 0)
return default_jump;
}
/* Try the high and low bounds if present. */
if (table->low == NULL)
{
if (compare_string (table->high_len, table->high,
selector_len, selector) >= 0)
return table->address;
table++;
table_len--;
if (table_len == 0)
return default_jump;
}
t = table + table_len - 1;
if (t->high == NULL)
{
if (compare_string (t->low_len, t->low,
selector_len, selector) <= 0)
return t->address;
table_len--;
if (table_len == 0)
return default_jump;
}
/* At this point, the only table entries are bounded entries. Find
the right entry with a binary chop. */
low = -1;
high = table_len;
while (low + 1 < high)
{
mid = (low + high) / 2;
t = table + mid;
i = compare_string (t->low_len, t->low, selector_len, selector);
if (i == 0)
return t->address;
if (i < 0)
low = mid;
else
high = mid;
}
/* The string now lies between the low indeces of the now-adjacent
high and low entries. Because it is less than the low entry of
'high', it can't be that one. If low is still -1, then no
entries match. Otherwise, we have to check the high entry of
'low'. */
if (low == -1)
return default_jump;
t = table + low;
if (compare_string (selector_len, selector,
t->high_len, t->high) <= 0)
return t->address;
return default_jump;
}
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