bin/varsym/varsym.c

   1 /*
   2  * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $DragonFly: src/bin/varsym/varsym.c,v 1.4 2003/12/11 20:33:49 dillon Exp $
  27  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <unistd.h>
  34 #include <sys/varsym.h>
  35
  36 static void usage(void);
  37 static void dumpvars(char *buf, int bytes);
  38
  39 int
  40 main(int ac, char **av)
  41 {
  42         int i;
  43         int mask =  VARSYM_ALL_MASK;
  44         int level = VARSYM_USER;
  45         int deleteOpt = 0;
  46         int verboseOpt = 1;
  47         int allOpt = 0;
  48
  49         while ((i = getopt(ac, av, "adhpqsu")) != -1) {
  50                 switch (i) {
  51                 case 'a':
  52                         allOpt = 1;
  53                         break;
  54                 case 'd':
  55                         deleteOpt = 1;
  56                         break;
  57                 case 'p':
  58                         mask = VARSYM_PROC_MASK;
  59                         level = VARSYM_PROC;
  60                         break;
  61                 case 'q':
  62                         verboseOpt = 0;
  63                         break;
  64                 case 's':
  65                         mask = VARSYM_SYS_MASK;
  66                         level = VARSYM_SYS;
  67                         break;
  68                 case 'u':
  69                         mask = VARSYM_USER_MASK;
  70                         level = VARSYM_USER;
  71                         break;
  72                 case 'h':
  73                 default:
  74                         usage();
  75                         return(-1);
  76                 }
  77         }
  78
  79         if (allOpt) {
  80                 char buf[1024];
  81                 int marker = 0;
  82                 int bytes;
  83
  84                 for (;;) {
  85                         bytes = varsym_list(level, buf, sizeof(buf), &marker);
  86                         if (bytes < 0)          /* error occured */
  87                             break;
  88                         dumpvars(buf, bytes);
  89                         if (marker < 0)         /* no more vars */
  90                             break;
  91                 }
  92                 if (bytes < 0)
  93                         fprintf(stderr, "varsym_list(): %s\n", strerror(errno));
  94         }
  95
  96         for ( ; optind < ac; optind++) {
  97                 char *name = av[optind];
  98                 char *data = strchr(name, '=');
  99                 int error;
 100                 char buf[MAXVARSYM_DATA];
 101
 102                 if (data)
 103                         *data++ = 0;
 104
 105                 if (deleteOpt) {
 106                         error = varsym_set(level, name, NULL);
 107                 }
 108                 else if (data) {
 109                         error = varsym_set(level, name, data);
 110                 }
 111                 else {
 112                         error = varsym_get(mask, name, buf, sizeof(buf));
 113                         if (error >= 0 && error <= (int)sizeof(buf)) {
 114                                 if (verboseOpt)
 115                                         printf("%s=", name);
 116                                 printf("%s\n", buf);
 117                         }
 118                 }
 119                 if (error < 0 && verboseOpt)
 120                         fprintf(stderr, "%s: %s\n", name, strerror(errno));
 121         }
 122
 123         return(0);
 124 }
 125
 126 static void
 127 dumpvars(char *buf, int bytes)
 128 {
 129     int b;
 130     int i;
 131     char *vname = NULL;
 132     char *vdata = NULL;
 133
 134     for (b = i = 0; i < bytes; ++i) {
 135         if (buf[i] == 0) {
 136             if (vname == NULL) {
 137                 vname = buf + b;
 138             } else {
 139                 vdata = buf + b;
 140                 printf("%s=%s\n", vname, vdata);
 141                 vname = vdata = NULL;
 142             }
 143             b = i + 1;
 144         }
 145     }
 146 }
 147
 148 static void
 149 usage(void)
 150 {
 151         fprintf(stderr, "usage: varsym [-adpqsu] [var[=data] ...]\n");
 152 }
 153