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/*
* Copyright (C) 2001-2003 Hewlett-Packard Co.
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
*
* Copyright (C) 2001 Silicon Graphics, Inc.
* Contributed by Brent Casavant <bcasavan@sgi.com>
*
* This file is part of the ELILO, the EFI Linux boot loader.
*
* ELILO 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.
*
* ELILO 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 ELILO; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Please check out the elilo.txt for complete documentation on how
* to use this program.
*/
#include <efi.h>
#include <efilib.h>
/*
* A variable name is 1 character long and case sensitive. So
* we actually have 52 (26*2) possible variables.
*/
#define MAX_VARIABLES (26<<1)
#define MAX_VARIABLE_LENGTH 128
#define VAR_IDX(a) (((a) >= 'a' && (a) <= 'z') ? 26-'a'+(a) : (a)-'A')
#define IDX_VAR(i) ((i) < 26 ? 'A'+(i) : 'a'+ ((i)-26))
typedef struct {
CHAR16 value[MAX_VARIABLE_LENGTH];
} elilo_var_t;
static elilo_var_t vars[MAX_VARIABLES]; /* set of variables */
INTN
set_var(CHAR16 v, CHAR16 *value)
{
/* invalid variable name */
if (v < 'A' || (v > 'Z' && v < 'a') || v > 'z') return -1;
StrCpy(vars[VAR_IDX(v)].value, value);
return 0;
}
CHAR16 *
get_var(CHAR16 v)
{
/* invalid variable name */
if (v < L'A' || (v > L'Z' && v < L'a') || v > L'z') return NULL;
return vars[VAR_IDX(v)].value;
}
VOID
print_vars(VOID)
{
INTN i;
UINTN cnt = 0;
for(i=0; i < MAX_VARIABLES; i++) {
if (vars[i].value[0]) {
cnt++;
Print(L"%c = \"%s\"\n", IDX_VAR(i), vars[i].value);
}
}
if (cnt == 0) Print(L"no variable defined\n");
}
INTN
subst_vars(CHAR16 *in, CHAR16 *out, INTN maxlen)
{
/*
* we cannot use \\ for the despecialization character because
* it is also used as a path separator in EFI.
*/
#define DSPEC_CHAR L'&'
INTN i, l, j, cnt;
INTN m = 0, d = 0;
CHAR16 *val;
if (in == NULL || out == NULL || maxlen <= 1) return -1;
l = StrLen(in);
maxlen--;
for (i=0, j=0;i < l; i++) {
cnt = 1;
val = in+i;
if (*val == DSPEC_CHAR && d == 0) {
d = 1;
continue;
}
if(m == 1) {
m = 0;
val = get_var(*val);
if (val == NULL) continue;
cnt = StrLen(val);
} else if (*val == L'%' && d == 0) {
m = 1;
continue;
}
d = 0;
while (j < maxlen && cnt) {
out[j++] = *val++;
cnt--;
}
if (j == maxlen) break;
}
out[j] = CHAR_NULL;
return 0;
}
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