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Copyright (C) 2004 Marc Singer
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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Please refer to the file debian/copyright for further details.
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In order to expand variables recursively, the expand_variables()
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function is recursive. It copies the characters from one string to
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another, expanding variables as they are found. When a variable is
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detected, it is looked-up and then expanded using the buffer space
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following the current point in the expansion buffer.
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The only hazard is that the function will silently fail if an
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expansion would overflow the buffer. In this case, the user will
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see an unexpanded variable in the output.
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#include <linux/types.h>
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#include <linux/string.h>
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#define TIMECMD_REPORT
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#if defined (CONFIG_ALIAS) || defined (CONFIG_ENV)
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static char* expand_variables (const char* rgbSrc)
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#if defined (CONFIG_ALIASES) || defined (CONFIG_ENV)
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# define USE_EXPAND_VARIABLES
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#if defined (USE_EXPAND_VARIABLES)
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static char* _expand_variables (const char* rgbSrc,
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char* rgbExpand, size_t cbExpand)
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const char* pchSrc;
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static char __xbss(command) rgb[CB_COMMAND_MAX];
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char* pch = rgbExpand; /* Destination pointer, this step */
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char* pchKey = NULL;
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for (pchSrc = rgbSrc; pch < rgb + sizeof (rgb) - 1; ++pchSrc) {
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for (pchSrc = rgbSrc; pch < rgbExpand + cbExpand - 1; ++pchSrc) {
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case 0: /* Beginning of word */
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if (*pchSrc == '"')
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case 2: /* Scanning variable key */
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if (isalpha (*pchSrc) || *pchSrc == '_' || *pchSrc == '-')
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|| *pchSrc == '_' || *pchSrc == '-') /* key ::= [A-Za-z_-]+ */
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value = lookup_alias_or_env (pchKey + 1, 0);
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if (pch + strlen (value) + 1 >= rgb + sizeof (rgb) - 1)
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return 0; /* Simple failure on overflow */
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strcpy (pchKey, value);
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pch = pchKey + strlen (value);
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*pch = 0; /* Terminate string so lookup can succeed */
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const char* value = lookup_alias_or_env (pchKey + 1, 0);
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const char* value_expanded;
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if (pchKey + strlen (value) >= rgbExpand + cbExpand - 1)
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return 0; /* Simple overflow */
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value_expanded = _expand_variables (value, pch + 1,
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rgbExpand + cbExpand - 1
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value = value_expanded;
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/* Successful expansion, so replace
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variable with substitution */
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memmove (pchKey, value, strlen (value) + 1);
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pch = pchKey + strlen (pchKey);
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state = 0; /* In any case, return to normal parsing */
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case 11: /* Quoting */
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return fChanged && state == 0 ? rgb : NULL;
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return fChanged && state == 0 ? rgbExpand : NULL;
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static char* expand_variables (const char* rgbSrc)
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static char __xbss(command) rgbExpand[2*1024]; /* Ridiculously large */
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return _expand_variables (rgbSrc, rgbExpand, sizeof (rgbExpand));
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error_description = NULL;
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result = command_match->func (argc, argv);
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if (result < ERROR_IMPORTANT) {
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printf ("Error %d", result);
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error_description = NULL;
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result = command_match
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? command_match->func (argc, argv)
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if (result < ERROR_IMPORTANT) {
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printf ("Error %d", result);
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#if !defined (CONFIG_SMALL)
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if (error_description == NULL) {
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error_description = "parameter error"; break;
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error_description = "error on open"; break;
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case ERROR_AMBIGUOUS:
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error_description = "ambiguous"; break;
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error_description = "no driver"; break;
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case ERROR_UNSUPPORTED:
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error_description = "unsupported"; break;
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case ERROR_BADPARTITION:
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error_description = "bad partition"; break;
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case ERROR_FILENOTFOUND:
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error_description = "file not found"; break;
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case ERROR_IOFAILURE:
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error_description = "i/o failure"; break;
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error_description = "break"; break;
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if (error_description == NULL) {
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error_description = "command failure"; break;
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error_description = "parameter error"; break;
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error_description = "error on open"; break;
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case ERROR_AMBIGUOUS:
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error_description = "ambiguous"; break;
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error_description = "no driver"; break;
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case ERROR_UNSUPPORTED:
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error_description = "unsupported"; break;
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case ERROR_BADPARTITION:
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error_description = "bad partition"; break;
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case ERROR_FILENOTFOUND:
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error_description = "file not found"; break;
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case ERROR_IOFAILURE:
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error_description = "i/o failure"; break;
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error_description = "break"; break;
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case ERROR_NOCOMMAND:
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error_description = "no such command"; break;
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error_description = "timeout"; break;
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case ERROR_UNRECOGNIZED:
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error_description = "unrecognized operand"; break;
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if (error_description)
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printf (" (%s)", error_description);
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return ERROR_NOCOMMAND;
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void exec_monitor (void)
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const char** argv;
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strcpy (sz, szStartup);
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DBG (1, "%s: startup '%s'\n", __FUNCTION__, sz);
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while (pch && *pch) {
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char* pchEnd = strchr (pch, ';');
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DBG (1, " pchEnd 0x%p *pchEnd %x\n", pchEnd, pchEnd ? *pchEnd : 0);
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while (*pch == ' ')
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printf ("\r# %s\n", pch);
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result = parse_command (pch, &argc, &argv);
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if (result >= 0 && (call_command (argc, argv) && result != 1))
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printf ("\r# %s\n", pch);
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result = parse_command (pch, &argc, &argv);
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if (result >= 0 && (call_command (argc, argv) && result != 1))
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pch = (pchEnd ? pchEnd + 1 : 0);
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DBG (1, " pch 0x%p *pch %x\n", pch, pch ? *pch : 0);
added
removed
src/apex/command.c
