/*------------------------------------------------------------------------- * Filename: command.c * Version: $Id: command.c,v 1.9 2002/01/03 16:07:18 erikm Exp $ * Copyright: Copyright (C) 1999, Erik Mouw * Author: Erik Mouw * Description: Command line functions for blob * Created at: Sun Aug 29 17:23:40 1999 * Modified by: Erik Mouw * Modified at: Sun Oct 3 21:08:27 1999 *-----------------------------------------------------------------------*/ /* * command.c: Command line functions for blob * * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) * * This program 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 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #ident "$Id: command.c,v 1.9 2002/01/03 16:07:18 erikm Exp $" #ifdef HAVE_CONFIG_H # include #endif #include #include #include #include #include #include #include #include /* command list start and end. filled in by the linker */ extern u32 __commandlist_start; extern u32 __commandlist_end; /* the first command */ commandlist_t *commands; static void init_commands(void) { commandlist_t *lastcommand; commandlist_t *cmd, *next_cmd; commands = (commandlist_t *) &__commandlist_start; lastcommand = (commandlist_t *) &__commandlist_end; /* make a list */ /* FIXME: should sort the list in alphabetical order over here */ cmd = next_cmd = commands; next_cmd++; while(next_cmd < lastcommand) { cmd->next = next_cmd; cmd++; next_cmd++; } } __initlist(init_commands, INIT_LEVEL_OTHER_STUFF); #define STATE_WHITESPACE (0) #define STATE_WORD (1) static void parse_args(char *cmdline, int *argc, char **argv) { char *c; int state = STATE_WHITESPACE; int i; *argc = 0; if(strlen(cmdline) == 0) return; /* convert all tabs into single spaces */ c = cmdline; while(*c != '\0') { if(*c == '\t') *c = ' '; c++; } c = cmdline; i = 0; /* now find all words on the command line */ while(*c != '\0') { if(state == STATE_WHITESPACE) { if(*c != ' ') { argv[i] = c; i++; state = STATE_WORD; } } else { /* state == STATE_WORD */ if(*c == ' ') { *c = '\0'; state = STATE_WHITESPACE; } } c++; } *argc = i; #ifdef BLOB_DEBUG for(i = 0; i < *argc; i++) { printerrprefix(); SerialOutputString("argv["); SerialOutputDec(i); SerialOutputString("] = "); SerialOutputString(argv[i]); serial_write('\n'); } #endif } /* return the number of commands that match */ static int get_num_command_matches(char *cmdline) { commandlist_t *cmd; int len; int num_matches = 0; len = strlen(cmdline); for(cmd = commands; cmd != NULL; cmd = cmd->next) { if(cmd->magic != COMMAND_MAGIC) { #ifdef BLOB_DEBUG printerrprefix(); SerialOutputString(__FUNCTION__ "(): Address = 0x"); SerialOutputHex((u32)cmd); serial_write('\n'); #endif return -EMAGIC; } if(strncmp(cmd->name, cmdline, len) == 0) num_matches++; } return num_matches; } int parse_command(char *cmdline) { commandlist_t *cmd; int argc, num_commands, len; char *argv[MAX_ARGS]; parse_args(cmdline, &argc, argv); /* only whitespace */ if(argc == 0) return 0; num_commands = get_num_command_matches(argv[0]); /* error */ if(num_commands < 0) return num_commands; /* no command matches */ if(num_commands == 0) return -ECOMMAND; /* ambiguous command */ if(num_commands > 1) return -EAMBIGCMD; len = strlen(argv[0]); /* single command, go for it */ for(cmd = commands; cmd != NULL; cmd = cmd->next) { if(cmd->magic != COMMAND_MAGIC) { #ifdef BLOB_DEBUG printerrprefix(); SerialOutputString(__FUNCTION__ "(): Address = 0x"); SerialOutputHex((u32)cmd); serial_write('\n'); #endif return -EMAGIC; } if(strncmp(cmd->name, argv[0], len) == 0) { /* call function */ return cmd->callback(argc, argv); } } return -ECOMMAND; } /* help command */ static int help(int argc, char *argv[]) { commandlist_t *cmd; /* help on a command? */ if(argc >= 2) { for(cmd = commands; cmd != NULL; cmd = cmd->next) { if(strncmp(cmd->name, argv[1], MAX_COMMANDLINE_LENGTH) == 0) { SerialOutputString("Help for '"); SerialOutputString(argv[1]); SerialOutputString("':\n\nUsage: "); SerialOutputString(cmd->help); return 0; } } return -EINVAL; } SerialOutputString("The following commands are supported:"); for(cmd = commands; cmd != NULL; cmd = cmd->next) { SerialOutputString("\n* "); SerialOutputString(cmd->name); } SerialOutputString("\nUse \"help command\" to get help on a specific command\n"); return 0; } static char helphelp[] = "help [command]\n" "Get help on [command], " "or a list of supported commands if a command is omitted.\n"; __commandlist(help, "help", helphelp); /* display a prompt, or the standard prompt if prompt == NULL */ void DisplayPrompt(char *prompt) { if(prompt == NULL) { SerialOutputString(PACKAGE "> "); } else { SerialOutputString(prompt); } } /* more or less like SerialInputString(), but with echo and backspace */ int __attribute__((weak)) GetCommand(char *command, int len, int timeout) { u32 startTime, currentTime; int c; int i; int numRead; int maxRead = len - 1; TimerClearOverflow(); startTime = TimerGetTime(); for(numRead = 0, i = 0; numRead < maxRead;) { /* try to get a byte from the serial port */ while(serial_poll() != 0) { currentTime = TimerGetTime(); /* check timeout value */ if((currentTime - startTime) > (timeout * TICKS_PER_SECOND)) { /* timeout */ command[i++] = '\0'; return(numRead); } } c = serial_read(); /* check for errors */ if(c < 0) { command[i++] = '\0'; serial_write('\n'); printerror(c, "can't read command"); return c; } if((c == '\r') || (c == '\n')) { command[i++] = '\0'; /* print newline */ serial_write('\n'); return(numRead); } else if(c == '\b') { /* FIXME: is this backspace? */ if(i > 0) { i--; numRead--; /* cursor one position back. */ SerialOutputString("\b \b"); } } else { command[i++] = c; numRead++; /* print character */ serial_write(c); } } return(numRead); }
