pexpert/gen/bootargs.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 #include <pexpert/pexpert.h>
  23
  24 extern boolean_t isargsep( char c);
  25 extern int argstrcpy(char *from, char *to);
  26 extern int getval(char *s, int *val);
  27
  28 #define NUM     0
  29 #define STR     1
  30
  31 boolean_t
  32 PE_parse_boot_arg(
  33         const char  *arg_string,
  34         void            *arg_ptr)
  35 {
  36         return PE_parse_boot_argn(arg_string, arg_ptr, -1);
  37 }
  38
  39 boolean_t
  40 PE_parse_boot_argn(
  41         const char      *arg_string,
  42         void            *arg_ptr,
  43         int                     max_len)
  44 {
  45         char *args;
  46         char *cp, c;
  47         int i;
  48         int val;
  49         boolean_t arg_boolean;
  50         boolean_t arg_found;
  51
  52         args = PE_boot_args();
  53         if (*args == '\0') return FALSE;
  54
  55         arg_found = FALSE;
  56
  57         while(isargsep(*args)) args++;
  58
  59         while (*args)
  60         {
  61                 if (*args == '-')
  62                         arg_boolean = TRUE;
  63                 else
  64                         arg_boolean = FALSE;
  65
  66                 cp = args;
  67                 while (!isargsep (*cp) && *cp != '=')
  68                         cp++;
  69                 if (*cp != '=' && !arg_boolean)
  70                         goto gotit;
  71
  72                 c = *cp;
  73
  74                 i = cp-args;
  75                 if (strncmp(args, arg_string, i) ||
  76                     (i!=strlen(arg_string)))
  77                         goto gotit;
  78                 if (arg_boolean) {
  79                         *(unsigned int *)arg_ptr = TRUE;
  80                         arg_found = TRUE;
  81                         break;
  82                 } else {
  83                         while (isargsep (*cp))
  84                                 cp++;
  85                         if (*cp == '=' && c != '=') {
  86                                 args = cp+1;
  87                                 goto gotit;
  88                         }
  89                         if ('_' == *arg_string) /* Force a string copy if the argument name begins with an underscore */
  90                         {
  91                                 int hacklen = 16 > max_len ? 16 : max_len;
  92                                 argstrcpy2 (++cp, (char *)arg_ptr, hacklen); /* Hack - terminate after 16 characters */
  93                                 arg_found = TRUE;
  94                                 break;
  95                         }
  96                         switch (getval(cp, &val))
  97                         {
  98                                 case NUM:
  99                                         *(unsigned int *)arg_ptr = val;
 100                                         arg_found = TRUE;
 101                                         break;
 102                                 case STR:
 103                                         if(max_len > 0) //max_len of 0 performs no copy at all
 104                                                 argstrcpy2(++cp, (char *)arg_ptr, max_len);
 105                                         else if(max_len == -1)
 106                                                 argstrcpy(++cp, (char *)arg_ptr);
 107                                         arg_found = TRUE;
 108                                         break;
 109                         }
 110                         goto gotit;
 111                 }
 112 gotit:
 113                 /* Skip over current arg */
 114                 while(!isargsep(*args)) args++;
 115
 116                 /* Skip leading white space (catch end of args) */
 117                 while(*args && isargsep(*args)) args++;
 118         }
 119
 120         return(arg_found);
 121 }
 122
 123 boolean_t isargsep(
 124         char c)
 125 {
 126         if (c == ' ' || c == '\0' || c == '\t')
 127                 return(TRUE);
 128         else
 129                 return(FALSE);
 130 }
 131
 132 int
 133 argstrcpy(
 134         char *from,
 135         char *to)
 136 {
 137         int i = 0;
 138
 139         while (!isargsep(*from)) {
 140                 i++;
 141                 *to++ = *from++;
 142         }
 143         *to = 0;
 144         return(i);
 145 }
 146
 147 int
 148 argstrcpy2(
 149         char *from,
 150         char *to,
 151         unsigned maxlen)
 152 {
 153         int i = 0;
 154
 155         while (!isargsep(*from) && i < maxlen) {
 156                 i++;
 157                 *to++ = *from++;
 158         }
 159         *to = 0;
 160         return(i);
 161 }
 162
 163 int
 164 getval(
 165         char *s,
 166         int *val)
 167 {
 168         register unsigned radix, intval;
 169         register unsigned char c;
 170         int sign = 1;
 171
 172         if (*s == '=') {
 173                 s++;
 174                 if (*s == '-')
 175                         sign = -1, s++;
 176                 intval = *s++-'0';
 177                 radix = 10;
 178                 if (intval == 0)
 179                         switch(*s) {
 180
 181                         case 'x':
 182                                 radix = 16;
 183                                 s++;
 184                                 break;
 185
 186                         case 'b':
 187                                 radix = 2;
 188                                 s++;
 189                                 break;
 190
 191                         case '0': case '1': case '2': case '3':
 192                         case '4': case '5': case '6': case '7':
 193                                 intval = *s-'0';
 194                                 s++;
 195                                 radix = 8;
 196                                 break;
 197
 198                         default:
 199                                 if (!isargsep(*s))
 200                                         return (STR);
 201                         }
 202                 for(;;) {
 203                         if (((c = *s++) >= '0') && (c <= '9'))
 204                                 c -= '0';
 205                         else if ((c >= 'a') && (c <= 'f'))
 206                                 c -= 'a' - 10;
 207                         else if ((c >= 'A') && (c <= 'F'))
 208                                 c -= 'A' - 10;
 209                         else if (c == 'k' || c == 'K')
 210                                 { sign *= 1024; break; }
 211                         else if (c == 'm' || c == 'M')
 212                                 { sign *= 1024 * 1024; break; }
 213                         else if (c == 'g' || c == 'G')
 214                                 { sign *= 1024 * 1024 * 1024; break; }
 215                         else if (isargsep(c))
 216                                 break;
 217                         else
 218                                 return (STR);
 219                         if (c >= radix)
 220                                 return (STR);
 221                         intval *= radix;
 222                         intval += c;
 223                 }
 224                 *val = intval * sign;
 225                 return (NUM);
 226         }
 227         *val = 1;
 228         return (NUM);
 229 }