sys/boot/dloader/subs.c

   1 /*
   2  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <stand.h>
  36 #include <string.h>
  37 #include "bootstrap.h"
  38 #include "dloader.h"
  39
  40 dvar_t dvbase;
  41 dvar_t *dvlastp = &dvbase;
  42
  43 dvar_t
  44 dvar_get(const char *name)
  45 {
  46         dvar_t var;
  47
  48         for (var = dvbase; var; var = var->next) {
  49                 if (strcmp(name, var->name) == 0)
  50                         return(var);
  51         }
  52         return(NULL);
  53 }
  54
  55 void
  56 dvar_set(const char *name, char **data, int count)
  57 {
  58         dvar_t var;
  59
  60         for (var = dvbase; var; var = var->next) {
  61                 if (strcmp(name, var->name) == 0)
  62                         break;
  63         }
  64         if (var == NULL) {
  65                 var = malloc(sizeof(*var) + strlen(name) + 1);
  66                 var->name = (char *)(void *)(var + 1);
  67                 strcpy(var->name, name);
  68                 var->next = NULL;
  69                 *dvlastp = var;
  70                 dvlastp = &var->next;
  71         } else {
  72                 while (--var->count >= 0)
  73                         free(var->data[var->count]);
  74                 free(var->data);
  75                 /* var->data = NULL; not needed */
  76         }
  77         var->count = count;
  78         var->data = malloc(sizeof(char *) * (count + 1));
  79         var->data[count] = NULL;
  80         while (--count >= 0)
  81                 var->data[count] = strdup(data[count]);
  82 }
  83
  84 dvar_t
  85 dvar_copy(dvar_t ovar)
  86 {
  87         dvar_t var;
  88         int count;
  89
  90         var = malloc(sizeof(*var));
  91         bzero(var, sizeof(*var));
  92         count = ovar->count;
  93
  94         var->count = count;
  95         var->data = malloc(sizeof(char *) * (count + 1));
  96         var->data[count] = NULL;
  97         while (--count >= 0)
  98                 var->data[count] = strdup(ovar->data[count]);
  99         return (var);
 100 }
 101
 102 void
 103 dvar_unset(const char *name)
 104 {
 105         dvar_t *lastp;
 106         dvar_t var;
 107         char *p;
 108
 109         lastp = &dvbase;
 110         if ((p = strchr(name, '*')) != NULL) {
 111                 while ((var = *lastp) != NULL) {
 112                         if (strlen(var->name) >= p - name &&
 113                             strncmp(var->name, name, p - name) == 0) {
 114                                 dvar_free(lastp);
 115                         } else {
 116                                 lastp = &var->next;
 117                         }
 118                 }
 119         } else {
 120                 while ((var = *lastp) != NULL) {
 121                         if (strcmp(name, var->name) == 0) {
 122                                 dvar_free(lastp);
 123                                 break;
 124                         }
 125                         lastp = &var->next;
 126                 }
 127         }
 128 }
 129
 130 dvar_t
 131 dvar_first(void)
 132 {
 133         return(dvbase);
 134 }
 135
 136 dvar_t
 137 dvar_next(dvar_t var)
 138 {
 139         return(var->next);
 140 }
 141
 142 dvar_t *
 143 dvar_firstp(void)
 144 {
 145         return(&dvbase);
 146 }
 147
 148 dvar_t *
 149 dvar_nextp(dvar_t var)
 150 {
 151         return(&var->next);
 152 }
 153
 154 void
 155 dvar_free(dvar_t *lastp)
 156 {
 157         dvar_t dvar = *lastp;
 158
 159         if (dvlastp == &dvar->next)
 160                 dvlastp = lastp;
 161         *lastp = dvar->next;
 162         while (--dvar->count >= 0)
 163                 free(dvar->data[dvar->count]);
 164         free(dvar->data);
 165         free(dvar);
 166 }
 167
 168 int
 169 dvar_istrue(dvar_t var)
 170 {
 171         int retval = 0;
 172
 173         if (var != NULL && (strcasecmp(var->data[0], "yes") == 0 ||
 174             strcasecmp(var->data[0], "true") == 0 ||
 175             strcasecmp(var->data[0], "on") == 0 ||
 176             strcasecmp(var->data[0], "1") == 0))
 177                 retval = 1;
 178
 179         return (retval);
 180 }