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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [alias.c] - Rev 379
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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 Red Hat, 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., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 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. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-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,"%p", ((CYG_ADDRWORD)user_ram_start + 0x03ff) & ~0x03ff); return alias_buf; } else if (0 == strcasecmp("FREEMEMHI", alias)) { diag_sprintf(alias_buf,"%p", ((CYG_ADDRWORD)user_ram_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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