dockapps/wmckgmail/wmgeneral/misc.c

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/* dock.c- built-in Dock module for WindowMaker
*
* WindowMaker window manager
*
* Copyright (c) 1997 Alfredo K. Kojima
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <string.h>
#include "list.h"
#include "misc.h"
/*
*----------------------------------------------------------------------
* parse_command--
* Divides a command line into a argv/argc pair.
*----------------------------------------------------------------------
*/
#define PRC_ALPHA 0
#define PRC_BLANK 1
#define PRC_ESCAPE 2
#define PRC_DQUOTE 3
#define PRC_EOS 4
#define PRC_SQUOTE 5
typedef struct {
short nstate;
short output;
} DFA;
static DFA mtable[9][6] = {
{{3,1},{0,0},{4,0},{1,0},{8,0},{6,0}},
{{1,1},{1,1},{2,0},{3,0},{5,0},{1,1}},
{{1,1},{1,1},{1,1},{1,1},{5,0},{1,1}},
{{3,1},{5,0},{4,0},{1,0},{5,0},{6,0}},
{{3,1},{3,1},{3,1},{3,1},{5,0},{3,1}},
{{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
{{6,1},{6,1},{7,0},{6,1},{5,0},{3,0}},
{{6,1},{6,1},{6,1},{6,1},{5,0},{6,1}},
{{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
};
char*
next_token(char *word, char **next)
{
char *ptr;
char *ret, *t;
int state, ctype;
t = ret = malloc(strlen(word)+1);
ptr = word;
state = 0;
*t = 0;
while (1) {
if (*ptr==0)
ctype = PRC_EOS;
else if (*ptr=='\\')
ctype = PRC_ESCAPE;
else if (*ptr=='"')
ctype = PRC_DQUOTE;
else if (*ptr=='\'')
ctype = PRC_SQUOTE;
else if (*ptr==' ' || *ptr=='\t')
ctype = PRC_BLANK;
else
ctype = PRC_ALPHA;
if (mtable[state][ctype].output) {
*t = *ptr; t++;
*t = 0;
}
state = mtable[state][ctype].nstate;
ptr++;
if (mtable[state][0].output<0) {
break;
}
}
if (*ret==0)
t = NULL;
else
t = strdup(ret);
free(ret);
if (ctype==PRC_EOS)
*next = NULL;
else
*next = ptr;
return t;
}
extern void
parse_command(char *command, char ***argv, int *argc)
{
LinkedList *list = NULL;
char *token, *line;
int count, i;
line = command;
do {
token = next_token(line, &line);
if (token) {
list = list_cons(token, list);
}
} while (token!=NULL && line!=NULL);
count = list_length(list);
*argv = malloc(sizeof(char*)*count);
i = count;
while (list!=NULL) {
(*argv)[--i] = list->head;
list_remove_head(&list);
}
*argc = count;
}
extern pid_t
execCommand(char *command)
{
pid_t pid;
char **argv;
int argc;
parse_command(command, &argv, &argc);
if (argv==NULL) {
return 0;
}
if ((pid=fork())==0) {
char **args;
int i;
args = malloc(sizeof(char*)*(argc+1));
if (!args)
exit(10);
for (i=0; i<argc; i++) {
args[i] = argv[i];
}
args[argc] = NULL;
execvp(argv[0], args);
exit(10);
}
return pid;
}