-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * 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 version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see [sun.com URL with a
- * copy of GPLv2].
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- *
- * GPL HEADER END
- */
-/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
- * Use is subject to license terms.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <string.h>
-#include <stddef.h>
-#include <unistd.h>
-#include <sys/param.h>
-#include <assert.h>
-#include <lnet/api-support.h>
-
-#include "parser.h"
-
-static command_t * top_level; /* Top level of commands, initialized by
- * InitParser */
-static char * parser_prompt = NULL;/* Parser prompt, set by InitParser */
-static int done; /* Set to 1 if user types exit or quit */
-
-
-/* static functions */
-static char *skipwhitespace(char *s);
-static char *skiptowhitespace(char *s);
-static command_t *find_cmd(char *name, command_t cmds[], char **next);
-static int process(char *s, char **next, command_t *lookup, command_t **result,
- char **prev);
-static void print_commands(char *str, command_t *table);
-
-static char * skipwhitespace(char * s)
-{
- char * t;
- int len;
-
- len = (int)strlen(s);
- for (t = s; t <= s + len && isspace(*t); t++);
- return(t);
-}
-
-
-static char * skiptowhitespace(char * s)
-{
- char * t;
-
- for (t = s; *t && !isspace(*t); t++);
- return(t);
-}
-
-static int line2args(char *line, char **argv, int maxargs)
-{
- char *arg;
- int i = 0;
-
- arg = strtok(line, " \t");
- if ( arg ) {
- argv[i] = arg;
- i++;
- } else
- return 0;
-
- while( (arg = strtok(NULL, " \t")) && (i <= maxargs)) {
- argv[i] = arg;
- i++;
- }
- return i;
-}
-
-/* find a command -- return it if unique otherwise print alternatives */
-static command_t *Parser_findargcmd(char *name, command_t cmds[])
-{
- command_t *cmd;
-
- for (cmd = cmds; cmd->pc_name; cmd++) {
- if (strcmp(name, cmd->pc_name) == 0)
- return cmd;
- }
- return NULL;
-}
-
-int Parser_execarg(int argc, char **argv, command_t cmds[])
-{
- command_t *cmd;
-
- cmd = Parser_findargcmd(argv[0], cmds);
- if ( cmd ) {
- int rc = (cmd->pc_func)(argc, argv);
- if (rc == CMD_HELP)
- fprintf(stderr, "%s\n", cmd->pc_help);
- return rc;
- } else {
- printf("Try interactive use without arguments or use one of:\n");
- for (cmd = cmds; cmd->pc_name; cmd++)
- printf("\"%s\" ", cmd->pc_name);
- printf("\nas argument.\n");
- }
- return -1;
-}
-
-/* returns the command_t * (NULL if not found) corresponding to a
- _partial_ match with the first token in name. It sets *next to
- point to the following token. Does not modify *name. */
-static command_t * find_cmd(char * name, command_t cmds[], char ** next)
-{
- int i, len;
-
- if (!cmds || !name )
- return NULL;
-
- /* This sets name to point to the first non-white space character,
- and next to the first whitespace after name, len to the length: do
- this with strtok*/
- name = skipwhitespace(name);
- *next = skiptowhitespace(name);
- len = *next - name;
- if (len == 0)
- return NULL;
-
- for (i = 0; cmds[i].pc_name; i++) {
- if (strncasecmp(name, cmds[i].pc_name, len) == 0) {
- *next = skipwhitespace(*next);
- return(&cmds[i]);
- }
- }
- return NULL;
-}
-
-/* Recursively process a command line string s and find the command
- corresponding to it. This can be ambiguous, full, incomplete,
- non-existent. */
-static int process(char *s, char ** next, command_t *lookup,
- command_t **result, char **prev)
-{
- *result = find_cmd(s, lookup, next);
- *prev = s;
-
- /* non existent */
- if ( ! *result )
- return CMD_NONE;
-
- /* found entry: is it ambigous, i.e. not exact command name and
- more than one command in the list matches. Note that find_cmd
- points to the first ambiguous entry */
- if ( strncasecmp(s, (*result)->pc_name, strlen((*result)->pc_name)) &&
- find_cmd(s, (*result) + 1, next))
- return CMD_AMBIG;
-
- /* found a unique command: component or full? */
- if ( (*result)->pc_func ) {
- return CMD_COMPLETE;
- } else {
- if ( *next == '\0' ) {
- return CMD_INCOMPLETE;
- } else {
- return process(*next, next, (*result)->pc_sub_cmd, result, prev);
- }
- }
-}
-
-#ifdef HAVE_LIBREADLINE
-static command_t * match_tbl; /* Command completion against this table */
-static char * command_generator(const char * text, int state)
-{
- static int index,
- len;
- char *name;
-
- /* Do we have a match table? */
- if (!match_tbl)
- return NULL;
-
- /* If this is the first time called on this word, state is 0 */
- if (!state) {
- index = 0;
- len = (int)strlen(text);
- }
-
- /* Return next name in the command list that paritally matches test */
- while ( (name = (match_tbl + index)->pc_name) ) {
- index++;
-
- if (strncasecmp(name, text, len) == 0) {
- return(strdup(name));
- }
- }
-
- /* No more matches */
- return NULL;
-}
-
-/* probably called by readline */
-static char **command_completion(char * text, int start, int end)
-{
- command_t * table;
- char * pos;
-
- match_tbl = top_level;
-
- for (table = find_cmd(rl_line_buffer, match_tbl, &pos);
- table; table = find_cmd(pos, match_tbl, &pos))
- {
-
- if (*(pos - 1) == ' ') match_tbl = table->pc_sub_cmd;
- }
-
- return completion_matches(text, command_generator);
-}
-#endif
-
-/* take a string and execute the function or print help */
-int execute_line(char * line)
-{
- command_t *cmd, *ambig;
- char *prev;
- char *next, *tmp;
- char *argv[MAXARGS];
- int i;
- int rc = 0;
-
- switch( process(line, &next, top_level, &cmd, &prev) ) {
- case CMD_AMBIG:
- fprintf(stderr, "Ambiguous command \'%s\'\nOptions: ", line);
- while( (ambig = find_cmd(prev, cmd, &tmp)) ) {
- fprintf(stderr, "%s ", ambig->pc_name);
- cmd = ambig + 1;
- }
- fprintf(stderr, "\n");
- break;
- case CMD_NONE:
- fprintf(stderr, "No such command, type help\n");
- break;
- case CMD_INCOMPLETE:
- fprintf(stderr,
- "'%s' incomplete command. Use '%s x' where x is one of:\n",
- line, line);
- fprintf(stderr, "\t");
- for (i = 0; cmd->pc_sub_cmd[i].pc_name; i++) {
- fprintf(stderr, "%s ", cmd->pc_sub_cmd[i].pc_name);
- }
- fprintf(stderr, "\n");
- break;
- case CMD_COMPLETE:
- i = line2args(line, argv, MAXARGS);
- rc = (cmd->pc_func)(i, argv);
-
- if (rc == CMD_HELP)
- fprintf(stderr, "%s\n", cmd->pc_help);
-
- break;
- }
-
- return rc;
-}
-
-int
-noop_fn ()
-{
- return (0);
-}
-
-/* just in case you're ever in an airplane and discover you
- forgot to install readline-dev. :) */
-int init_input()
-{
- int interactive = isatty (fileno (stdin));
-
-#ifdef HAVE_LIBREADLINE
- using_history();
- stifle_history(HISTORY);
-
- if (!interactive)
- {
- rl_prep_term_function = (rl_vintfunc_t *)noop_fn;
- rl_deprep_term_function = (rl_voidfunc_t *)noop_fn;
- }
-
- rl_attempted_completion_function = (CPPFunction *)command_completion;
- rl_completion_entry_function = (void *)command_generator;
-#endif
- return interactive;
-}
-
-#ifndef HAVE_LIBREADLINE
-#define add_history(s)
-char * readline(char * prompt)
-{
- char line[2048];
- int n = 0;
- if (prompt)
- printf ("%s", prompt);
- if (fgets(line, sizeof(line), stdin) == NULL)
- return (NULL);
- n = strlen(line);
- if (n && line[n-1] == '\n')
- line[n-1] = '\0';
- return strdup(line);
-}
-#endif
-
-/* this is the command execution machine */
-int Parser_commands(void)
-{
- char *line, *s;
- int rc = 0;
- int interactive;
-
- interactive = init_input();
-
- while(!done) {
- line = readline(interactive ? parser_prompt : NULL);
-
- if (!line) break;
-
- s = skipwhitespace(line);
-
- if (*s) {
- add_history(s);
- rc = execute_line(s);
-
- /* reset optind to 0 to tell getopt
- * to reinitialize itself */
- optind = 0;
- }
-
- free(line);
- }
- return rc;
-}
-
-
-/* sets the parser prompt */
-void Parser_init(char * prompt, command_t * cmds)
-{
- done = 0;
- top_level = cmds;
- if (parser_prompt) free(parser_prompt);
- parser_prompt = strdup(prompt);
-}
-
-/* frees the parser prompt */
-void Parser_exit(int argc, char *argv[])
-{
- done = 1;
- free(parser_prompt);
- parser_prompt = NULL;
-}
-
-/* convert a string to an integer */
-int Parser_int(char *s, int *val)
-{
- int ret;
-
- if (*s != '0')
- ret = sscanf(s, "%d", val);
- else if (*(s+1) != 'x')
- ret = sscanf(s, "%o", val);
- else {
- s++;
- ret = sscanf(++s, "%x", val);
- }
-
- return(ret);
-}
-
-
-void Parser_qhelp(int argc, char *argv[]) {
-
- printf("Available commands are:\n");
-
- print_commands(NULL, top_level);
- printf("For more help type: help command-name\n");
-}
-
-int Parser_help(int argc, char **argv)
-{
- char line[1024];
- char *next, *prev, *tmp;
- command_t *result, *ambig;
- int i;
-
- if ( argc == 1 ) {
- Parser_qhelp(argc, argv);
- return 0;
- }
-
- line[0]='\0';
- for ( i = 1 ; i < argc ; i++ ) {
- strcat(line, argv[i]);
- }
-
- switch ( process(line, &next, top_level, &result, &prev) ) {
- case CMD_COMPLETE:
- fprintf(stderr, "%s: %s\n",line, result->pc_help);
- break;
- case CMD_NONE:
- fprintf(stderr, "%s: Unknown command.\n", line);
- break;
- case CMD_INCOMPLETE:
- fprintf(stderr,
- "'%s' incomplete command. Use '%s x' where x is one of:\n",
- line, line);
- fprintf(stderr, "\t");
- for (i = 0; result->pc_sub_cmd[i].pc_name; i++) {
- fprintf(stderr, "%s ", result->pc_sub_cmd[i].pc_name);
- }
- fprintf(stderr, "\n");
- break;
- case CMD_AMBIG:
- fprintf(stderr, "Ambiguous command \'%s\'\nOptions: ", line);
- while( (ambig = find_cmd(prev, result, &tmp)) ) {
- fprintf(stderr, "%s ", ambig->pc_name);
- result = ambig + 1;
- }
- fprintf(stderr, "\n");
- break;
- }
- return 0;
-}
-
-
-void Parser_printhelp(char *cmd)
-{
- char *argv[] = { "help", cmd };
- Parser_help(2, argv);
-}
-
-/*************************************************************************
- * COMMANDS *
- *************************************************************************/
-
-
-static void print_commands(char * str, command_t * table) {
- command_t * cmds;
- char buf[80];
-
- for (cmds = table; cmds->pc_name; cmds++) {
- if (cmds->pc_func) {
- if (str) printf("\t%s %s\n", str, cmds->pc_name);
- else printf("\t%s\n", cmds->pc_name);
- }
- if (cmds->pc_sub_cmd) {
- if (str) {
- sprintf(buf, "%s %s", str, cmds->pc_name);
- print_commands(buf, cmds->pc_sub_cmd);
- } else {
- print_commands(cmds->pc_name, cmds->pc_sub_cmd);
- }
- }
- }
-}
-
-char *Parser_getstr(const char *prompt, const char *deft, char *res,
- size_t len)
-{
- char *line = NULL;
- int size = strlen(prompt) + strlen(deft) + 8;
- char *theprompt;
- theprompt = malloc(size);
- assert(theprompt);
-
- sprintf(theprompt, "%s [%s]: ", prompt, deft);
-
- line = readline(theprompt);
- free(theprompt);
-
- if ( line == NULL || *line == '\0' ) {
- strncpy(res, deft, len);
- } else {
- strncpy(res, line, len);
- }
-
- if ( line ) {
- free(line);
- return res;
- } else {
- return NULL;
- }
-}
-
-/* get integer from prompt, loop forever to get it */
-int Parser_getint(const char *prompt, long min, long max, long deft, int base)
-{
- int rc;
- long result;
- char *line;
- int size = strlen(prompt) + 40;
- char *theprompt = malloc(size);
- assert(theprompt);
- sprintf(theprompt,"%s [%ld, (0x%lx)]: ", prompt, deft, deft);
-
- fflush(stdout);
-
- do {
- line = NULL;
- line = readline(theprompt);
- if ( !line ) {
- fprintf(stdout, "Please enter an integer.\n");
- fflush(stdout);
- continue;
- }
- if ( *line == '\0' ) {
- free(line);
- result = deft;
- break;
- }
- rc = Parser_arg2int(line, &result, base);
- free(line);
- if ( rc != 0 ) {
- fprintf(stdout, "Invalid string.\n");
- fflush(stdout);
- } else if ( result > max || result < min ) {
- fprintf(stdout, "Error: response must lie between %ld and %ld.\n",
- min, max);
- fflush(stdout);
- } else {
- break;
- }
- } while ( 1 ) ;
-
- if (theprompt)
- free(theprompt);
- return result;
-
-}
-
-/* get boolean (starting with YyNn; loop forever */
-int Parser_getbool(const char *prompt, int deft)
-{
- int result = 0;
- char *line;
- int size = strlen(prompt) + 8;
- char *theprompt = malloc(size);
- assert(theprompt);
-
- fflush(stdout);
-
- if ( deft != 0 && deft != 1 ) {
- fprintf(stderr, "Error: Parser_getbool given bad default (%d).\n",
- deft);
- assert ( 0 );
- }
- sprintf(theprompt, "%s [%s]: ", prompt, (deft==0)? "N" : "Y");
-
- do {
- line = NULL;
- line = readline(theprompt);
- if ( line == NULL ) {
- result = deft;
- break;
- }
- if ( *line == '\0' ) {
- result = deft;
- break;
- }
- if ( *line == 'y' || *line == 'Y' ) {
- result = 1;
- break;
- }
- if ( *line == 'n' || *line == 'N' ) {
- result = 0;
- break;
- }
- if ( line )
- free(line);
- fprintf(stdout, "Invalid string. Must start with yY or nN\n");
- fflush(stdout);
- } while ( 1 );
-
- if ( line )
- free(line);
- if ( theprompt )
- free(theprompt);
- return result;
-}
-
-/* parse int out of a string or prompt for it */
-long Parser_intarg(const char *inp, const char *prompt, int deft,
- int min, int max, int base)
-{
- long result;
- int rc;
-
- rc = Parser_arg2int(inp, &result, base);
-
- if ( rc == 0 ) {
- return result;
- } else {
- return Parser_getint(prompt, deft, min, max, base);
- }
-}
-
-/* parse int out of a string or prompt for it */
-char *Parser_strarg(char *inp, const char *prompt, const char *deft,
- char *answer, int len)
-{
- if ( inp == NULL || *inp == '\0' ) {
- return Parser_getstr(prompt, deft, answer, len);
- } else
- return inp;
-}
-
-/* change a string into a number: return 0 on success. No invalid characters
- allowed. The processing of base and validity follows strtol(3)*/
-int Parser_arg2int(const char *inp, long *result, int base)
-{
- char *endptr;
-
- if ( (base !=0) && (base < 2 || base > 36) )
- return 1;
-
- *result = strtol(inp, &endptr, base);
-
- if ( *inp != '\0' && *endptr == '\0' )
- return 0;
- else
- return 1;
-}
-
-int Parser_quit(int argc, char **argv)
-{
- argc = argc;
- argv = argv;
- done = 1;
- return 0;
-}
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