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//==========================================================================
//
// alias.c
//
// RedBoot - alias support
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
//
// eCos 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.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas, jskov
// Date: 2002-05-15
// Purpose:
// Description:
//
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <redboot.h>
#ifdef CYGNUM_REDBOOT_FLASH_STRING_SIZE
# define MAX_STRING_LENGTH CYGNUM_REDBOOT_FLASH_STRING_SIZE
#else
# define MAX_STRING_LENGTH 32
#endif
// Lookup an alias. First try plain string aliases. If that fails try
// other types so allowing access to all configured values. This allows
// for alias (macro) expansion of normal 'fconfig' data, such as the
// board IP address.
static char *
lookup_alias(char *alias, char *alias_buf)
{
if (0 == strcasecmp("FREEMEMLO", alias)) {
diag_sprintf(alias_buf,"0x%x", ((CYG_ADDRWORD)mem_segments[0].start + 0x03ff) & ~0x03ff);
return alias_buf;
} else if (0 == strcasecmp("FREEMEMHI", alias)) {
diag_sprintf(alias_buf,"0x%x", ((CYG_ADDRWORD)mem_segments[0].end) & ~0x03ff);
return alias_buf;
}
#ifdef CYGSEM_REDBOOT_FLASH_ALIASES
return flash_lookup_alias(alias, alias_buf);
#else
return NULL;
#endif
}
// Expand aliases, this is recursive. ie if one alias contains other
// aliases, these will also be expanded from the insertion point
// onwards.
//
// If 'iter' is zero, then quoted strings are not expanded
//
static bool
_expand_aliases(char *line, int len, int iter)
{
char *lp = line;
char *ms, *me, *ep;
char *alias;
char c;
int offset, line_len, alias_len;
char alias_buf[MAX_STRING_LENGTH];
bool macro_found = false;
if ((line_len = strlen(line)) != 0) {
while (*lp) {
c = *lp++;
if ((c == '%') && (*lp == '{')) {
// Found a macro/alias to expand
ms = lp+1;
lp += 2;
while (*lp && (*lp != '}')) lp++;
if (!*lp) {
diag_printf("Invalid macro/alias '%s'\n", ms);
line[0] = '\0'; // Destroy line
return false;
}
me = lp;
*me = '\0';
lp++;
if ((alias = lookup_alias(ms,alias_buf)) != (char *)NULL) {
alias_len = strlen(alias);
// See if there is room in the line to expand this macro/alias
if ((line_len+alias_len) < len) {
// Make a hole by moving data within the line
offset = alias_len-strlen(ms)-2; // Number of bytes being inserted
ep = &lp[strlen(lp)-1];
if (offset > 1) {
ep[offset] = '\0';
while (ep != (lp-1)) {
ep[offset-1] = *ep;
ep--;
}
} else {
if (offset <=0) {
while ((lp-1) != ep) {
lp[offset-1] = *lp;
lp++;
}
lp[offset-1]='\0';
}
}
// Insert the macro/alias data
lp = ms-2;
while (*alias) {
if ((alias[0] == '%') && (alias[1] == '{')) macro_found = true;
*lp++ = *alias++;
}
line_len = strlen(line);
lp = lp - alias_len;
} else {
diag_printf("No room to expand '%s'\n", ms);
line[0] = '\0'; // Destroy line
return false;
}
} else {
diag_printf("Alias '%s' not defined\n", ms);
*me = '|';
}
} else if ((c == '"') && (iter == 0)) {
// Skip quoted strings
while (*lp && (*lp != '"')) lp++;
}
}
}
return macro_found;
}
void
expand_aliases(char *line, int len)
{
int iter = 0;
while (_expand_aliases(line, len, iter++)) {
}
}
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