172 lines
3.7 KiB
C
172 lines
3.7 KiB
C
/* wmgeneral miscellaneous functions
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*
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* from dock.c - built-in Dock module for WindowMaker window manager
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*
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* Copyright (c) 1997 Alfredo K. Kojima
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "list.h"
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#include "misc.h"
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/*
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*----------------------------------------------------------------------
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* parse_command--
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* Divides a command line into a argv/argc pair.
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*----------------------------------------------------------------------
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*/
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#define PRC_ALPHA 0
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#define PRC_BLANK 1
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#define PRC_ESCAPE 2
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#define PRC_DQUOTE 3
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#define PRC_EOS 4
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#define PRC_SQUOTE 5
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typedef struct {
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short nstate;
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short output;
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} DFA;
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static DFA mtable[9][6] = {
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{{3,1},{0,0},{4,0},{1,0},{8,0},{6,0}},
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{{1,1},{1,1},{2,0},{3,0},{5,0},{1,1}},
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{{1,1},{1,1},{1,1},{1,1},{5,0},{1,1}},
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{{3,1},{5,0},{4,0},{1,0},{5,0},{6,0}},
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{{3,1},{3,1},{3,1},{3,1},{5,0},{3,1}},
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{{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
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{{6,1},{6,1},{7,0},{6,1},{5,0},{3,0}},
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{{6,1},{6,1},{6,1},{6,1},{5,0},{6,1}},
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{{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
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};
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char*
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next_token(char *word, char **next)
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{
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char *ptr;
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char *ret, *t;
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int state, ctype;
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t = ret = malloc(strlen(word)+1);
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if (ret == NULL) {
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fprintf(stderr, "Insufficient memory.\n");
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exit(EXIT_FAILURE);
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}
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ptr = word;
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state = 0;
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*t = 0;
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while (1) {
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if (*ptr==0)
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ctype = PRC_EOS;
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else if (*ptr=='\\')
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ctype = PRC_ESCAPE;
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else if (*ptr=='"')
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ctype = PRC_DQUOTE;
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else if (*ptr=='\'')
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ctype = PRC_SQUOTE;
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else if (*ptr==' ' || *ptr=='\t')
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ctype = PRC_BLANK;
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else
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ctype = PRC_ALPHA;
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if (mtable[state][ctype].output) {
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*t = *ptr; t++;
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*t = 0;
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}
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state = mtable[state][ctype].nstate;
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ptr++;
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if (mtable[state][0].output<0) {
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break;
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}
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}
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if (*ret==0)
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t = NULL;
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else
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t = strdup(ret);
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free(ret);
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if (ctype==PRC_EOS)
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*next = NULL;
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else
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*next = ptr;
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return t;
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}
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extern void
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parse_command(char *command, char ***argv, int *argc)
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{
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LinkedList *list = NULL;
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char *token, *line;
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int count, i;
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line = command;
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do {
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token = next_token(line, &line);
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if (token) {
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list = list_cons(token, list);
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}
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} while (token!=NULL && line!=NULL);
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count = list_length(list);
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*argv = malloc(sizeof(char*)*count);
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i = count;
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while (list!=NULL) {
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(*argv)[--i] = list->head;
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list_remove_head(&list);
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}
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*argc = count;
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}
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extern pid_t
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execCommand(char *command)
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{
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pid_t pid;
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char **argv;
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int argc;
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parse_command(command, &argv, &argc);
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if (argv==NULL) {
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return 0;
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}
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if ((pid=fork())==0) {
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char **args;
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int i;
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args = malloc(sizeof(char*)*(argc+1));
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if (!args)
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exit(10);
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for (i=0; i<argc; i++) {
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args[i] = argv[i];
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}
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args[argc] = NULL;
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execvp(argv[0], args);
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exit(10);
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}
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free(argv);
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return pid;
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}
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