wmtz/wmgeneral/misc.c

   1 /*  wmgeneral miscellaneous functions
   2  *
   3  *  from dock.c - built-in Dock module for WindowMaker window manager
   4  *
   5  *  Copyright (c) 1997 Alfredo K. Kojima
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
  20  *  USA.
  21  */
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include "list.h"
  27 #include "misc.h"
  28
  29 /*
  30  *----------------------------------------------------------------------
  31  * parse_command--
  32  *      Divides a command line into a argv/argc pair.
  33  *----------------------------------------------------------------------
  34  */
  35 #define PRC_ALPHA       0
  36 #define PRC_BLANK       1
  37 #define PRC_ESCAPE      2
  38 #define PRC_DQUOTE      3
  39 #define PRC_EOS         4
  40 #define PRC_SQUOTE      5
  41
  42 typedef struct {
  43     short nstate;
  44     short output;
  45 } DFA;
  46
  47
  48 static DFA mtable[9][6] = {
  49     {{3,1},{0,0},{4,0},{1,0},{8,0},{6,0}},
  50     {{1,1},{1,1},{2,0},{3,0},{5,0},{1,1}},
  51     {{1,1},{1,1},{1,1},{1,1},{5,0},{1,1}},
  52     {{3,1},{5,0},{4,0},{1,0},{5,0},{6,0}},
  53     {{3,1},{3,1},{3,1},{3,1},{5,0},{3,1}},
  54     {{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
  55     {{6,1},{6,1},{7,0},{6,1},{5,0},{3,0}},
  56     {{6,1},{6,1},{6,1},{6,1},{5,0},{6,1}},
  57     {{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
  58 };
  59
  60 char*
  61 next_token(char *word, char **next)
  62 {
  63     char *ptr;
  64     char *ret, *t;
  65     int state, ctype;
  66
  67     t = ret = malloc(strlen(word)+1);
  68     if (ret == NULL) {
  69             fprintf(stderr, "Insufficient memory.\n");
  70             exit(EXIT_FAILURE);
  71     }
  72     ptr = word;
  73
  74     state = 0;
  75     *t = 0;
  76     while (1) {
  77         if (*ptr==0)
  78             ctype = PRC_EOS;
  79         else if (*ptr=='\\')
  80             ctype = PRC_ESCAPE;
  81         else if (*ptr=='"')
  82             ctype = PRC_DQUOTE;
  83         else if (*ptr=='\'')
  84             ctype = PRC_SQUOTE;
  85         else if (*ptr==' ' || *ptr=='\t')
  86             ctype = PRC_BLANK;
  87         else
  88             ctype = PRC_ALPHA;
  89
  90         if (mtable[state][ctype].output) {
  91             *t = *ptr; t++;
  92             *t = 0;
  93         }
  94         state = mtable[state][ctype].nstate;
  95         ptr++;
  96         if (mtable[state][0].output<0) {
  97             break;
  98         }
  99     }
 100
 101     if (*ret==0)
 102         t = NULL;
 103     else
 104         t = strdup(ret);
 105
 106     free(ret);
 107
 108     if (ctype==PRC_EOS)
 109         *next = NULL;
 110     else
 111         *next = ptr;
 112
 113     return t;
 114 }
 115
 116
 117 extern void
 118 parse_command(char *command, char ***argv, int *argc)
 119 {
 120     LinkedList *list = NULL;
 121     char *token, *line;
 122     int count, i;
 123
 124     line = command;
 125     do {
 126         token = next_token(line, &line);
 127         if (token) {
 128             list = list_cons(token, list);
 129         }
 130     } while (token!=NULL && line!=NULL);
 131
 132     count = list_length(list);
 133     *argv = malloc(sizeof(char*)*count);
 134     i = count;
 135     while (list!=NULL) {
 136         (*argv)[--i] = list->head;
 137         list_remove_head(&list);
 138     }
 139     *argc = count;
 140 }
 141
 142 extern pid_t
 143 execCommand(char *command)
 144 {
 145     pid_t pid;
 146     char **argv;
 147     int argc;
 148
 149     parse_command(command, &argv, &argc);
 150
 151     if (argv==NULL) {
 152         return 0;
 153     }
 154
 155     if ((pid=fork())==0) {
 156         char **args;
 157         int i;
 158
 159         args = malloc(sizeof(char*)*(argc+1));
 160         if (!args)
 161           exit(10);
 162         for (i=0; i<argc; i++) {
 163             args[i] = argv[i];
 164         }
 165         args[argc] = NULL;
 166         execvp(argv[0], args);
 167         exit(10);
 168     }
 169     free(argv);
 170     return pid;
 171 }