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 #define _POSIX_C_SOURCE 200809L
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include "list.h"
  28 #include "misc.h"
  29
  30 /*
  31  *----------------------------------------------------------------------
  32  * parse_command--
  33  *      Divides a command line into a argv/argc pair.
  34  *----------------------------------------------------------------------
  35  */
  36 #define PRC_ALPHA       0
  37 #define PRC_BLANK       1
  38 #define PRC_ESCAPE      2
  39 #define PRC_DQUOTE      3
  40 #define PRC_EOS         4
  41 #define PRC_SQUOTE      5
  42
  43 typedef struct {
  44     short nstate;
  45     short output;
  46 } DFA;
  47
  48
  49 static DFA mtable[9][6] = {
  50     {{3,1},{0,0},{4,0},{1,0},{8,0},{6,0}},
  51     {{1,1},{1,1},{2,0},{3,0},{5,0},{1,1}},
  52     {{1,1},{1,1},{1,1},{1,1},{5,0},{1,1}},
  53     {{3,1},{5,0},{4,0},{1,0},{5,0},{6,0}},
  54     {{3,1},{3,1},{3,1},{3,1},{5,0},{3,1}},
  55     {{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
  56     {{6,1},{6,1},{7,0},{6,1},{5,0},{3,0}},
  57     {{6,1},{6,1},{6,1},{6,1},{5,0},{6,1}},
  58     {{-1,-1},{0,0},{0,0},{0,0},{0,0},{0,0}}, /* final state */
  59 };
  60
  61 char*
  62 next_token(char *word, char **next)
  63 {
  64     char *ptr;
  65     char *ret, *t;
  66     int state, ctype;
  67
  68     t = ret = malloc(strlen(word)+1);
  69     if (ret == NULL) {
  70             fprintf(stderr, "Insufficient memory.\n");
  71             exit(EXIT_FAILURE);
  72     }
  73     ptr = word;
  74
  75     state = 0;
  76     *t = 0;
  77     while (1) {
  78         if (*ptr==0)
  79             ctype = PRC_EOS;
  80         else if (*ptr=='\\')
  81             ctype = PRC_ESCAPE;
  82         else if (*ptr=='"')
  83             ctype = PRC_DQUOTE;
  84         else if (*ptr=='\'')
  85             ctype = PRC_SQUOTE;
  86         else if (*ptr==' ' || *ptr=='\t')
  87             ctype = PRC_BLANK;
  88         else
  89             ctype = PRC_ALPHA;
  90
  91         if (mtable[state][ctype].output) {
  92             *t = *ptr; t++;
  93             *t = 0;
  94         }
  95         state = mtable[state][ctype].nstate;
  96         ptr++;
  97         if (mtable[state][0].output<0) {
  98             break;
  99         }
 100     }
 101
 102     if (*ret==0)
 103         t = NULL;
 104     else
 105         t = strdup(ret);
 106
 107     free(ret);
 108
 109     if (ctype==PRC_EOS)
 110         *next = NULL;
 111     else
 112         *next = ptr;
 113
 114     return t;
 115 }
 116
 117
 118 extern void
 119 parse_command(char *command, char ***argv, int *argc)
 120 {
 121     LinkedList *list = NULL;
 122     char *token, *line;
 123     int count, i;
 124
 125     line = command;
 126     do {
 127         token = next_token(line, &line);
 128         if (token) {
 129             list = list_cons(token, list);
 130         }
 131     } while (token!=NULL && line!=NULL);
 132
 133     count = list_length(list);
 134     *argv = malloc(sizeof(char*)*count);
 135     i = count;
 136     while (list!=NULL) {
 137         (*argv)[--i] = list->head;
 138         list_remove_head(&list);
 139     }
 140     *argc = count;
 141 }
 142
 143 extern pid_t
 144 execCommand(char *command)
 145 {
 146     pid_t pid;
 147     char **argv;
 148     int argc;
 149
 150     parse_command(command, &argv, &argc);
 151
 152     if (argv==NULL) {
 153         return 0;
 154     }
 155
 156     if ((pid=fork())==0) {
 157         char **args;
 158         int i;
 159
 160         args = malloc(sizeof(char*)*(argc+1));
 161         if (!args)
 162           exit(10);
 163         for (i=0; i<argc; i++) {
 164             args[i] = argv[i];
 165         }
 166         args[argc] = NULL;
 167         execvp(argv[0], args);
 168         exit(10);
 169     }
 170     free(argv);
 171     return pid;
 172 }