pexpert/gen/bootargs.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <pexpert/pexpert.h>
  29
  30 extern boolean_t isargsep( char c);
  31 extern int argstrcpy(char *from, char *to);
  32 extern int getval(char *s, int *val);
  33
  34 int argstrcpy2(char *from,char *to, unsigned maxlen);
  35
  36 #define NUM     0
  37 #define STR     1
  38
  39 boolean_t
  40 PE_parse_boot_arg(
  41         const char  *arg_string,
  42         void            *arg_ptr)
  43 {
  44         int max_len = -1;
  45
  46 #if CONFIG_EMBEDDED
  47         /* Limit arg size to 4 byte when no size is given */
  48         max_len = 4;
  49 #endif
  50
  51         return PE_parse_boot_argn(arg_string, arg_ptr, max_len);
  52 }
  53
  54 boolean_t
  55 PE_parse_boot_argn(
  56         const char      *arg_string,
  57         void            *arg_ptr,
  58         int                     max_len)
  59 {
  60         char *args;
  61         char *cp, c;
  62         unsigned int i;
  63         int val;
  64         boolean_t arg_boolean;
  65         boolean_t arg_found;
  66
  67         args = PE_boot_args();
  68         if (*args == '\0') return FALSE;
  69
  70         arg_found = FALSE;
  71
  72         while(isargsep(*args)) args++;
  73
  74         while (*args)
  75         {
  76                 if (*args == '-')
  77                         arg_boolean = TRUE;
  78                 else
  79                         arg_boolean = FALSE;
  80
  81                 cp = args;
  82                 while (!isargsep (*cp) && *cp != '=')
  83                         cp++;
  84                 if (*cp != '=' && !arg_boolean)
  85                         goto gotit;
  86
  87                 c = *cp;
  88
  89                 i = cp-args;
  90                 if (strncmp(args, arg_string, i) ||
  91                     (i!=strlen(arg_string)))
  92                         goto gotit;
  93                 if (arg_boolean) {
  94                         *(unsigned int *)arg_ptr = TRUE;
  95                         arg_found = TRUE;
  96                         break;
  97                 } else {
  98                         while (isargsep (*cp))
  99                                 cp++;
 100                         if (*cp == '=' && c != '=') {
 101                                 args = cp+1;
 102                                 goto gotit;
 103                         }
 104                         if ('_' == *arg_string) /* Force a string copy if the argument name begins with an underscore */
 105                         {
 106                                 int hacklen = 17 > max_len ? 17 : max_len;
 107                                 argstrcpy2 (++cp, (char *)arg_ptr, hacklen - 1); /* Hack - terminate after 16 characters */
 108                                 arg_found = TRUE;
 109                                 break;
 110                         }
 111                         switch (getval(cp, &val))
 112                         {
 113                                 case NUM:
 114                                         *(unsigned int *)arg_ptr = val;
 115                                         arg_found = TRUE;
 116                                         break;
 117                                 case STR:
 118                                         if(max_len > 0) //max_len of 0 performs no copy at all
 119                                                 argstrcpy2(++cp, (char *)arg_ptr, max_len - 1);
 120                                         else if(max_len == -1)
 121                                                 argstrcpy(++cp, (char *)arg_ptr);
 122                                         arg_found = TRUE;
 123                                         break;
 124                         }
 125                         goto gotit;
 126                 }
 127 gotit:
 128                 /* Skip over current arg */
 129                 while(!isargsep(*args)) args++;
 130
 131                 /* Skip leading white space (catch end of args) */
 132                 while(*args && isargsep(*args)) args++;
 133         }
 134
 135         return(arg_found);
 136 }
 137
 138 boolean_t isargsep(
 139         char c)
 140 {
 141         if (c == ' ' || c == '\0' || c == '\t')
 142                 return(TRUE);
 143         else
 144                 return(FALSE);
 145 }
 146
 147 int
 148 argstrcpy(
 149         char *from,
 150         char *to)
 151 {
 152         int i = 0;
 153
 154         while (!isargsep(*from)) {
 155                 i++;
 156                 *to++ = *from++;
 157         }
 158         *to = 0;
 159         return(i);
 160 }
 161
 162 int
 163 argstrcpy2(
 164         char *from,
 165         char *to,
 166         unsigned maxlen)
 167 {
 168         unsigned int i = 0;
 169
 170         while (!isargsep(*from) && i < maxlen) {
 171                 i++;
 172                 *to++ = *from++;
 173         }
 174         *to = 0;
 175         return(i);
 176 }
 177
 178 int
 179 getval(
 180         char *s,
 181         int *val)
 182 {
 183         unsigned int radix, intval;
 184     unsigned char c;
 185         int sign = 1;
 186
 187         if (*s == '=') {
 188                 s++;
 189                 if (*s == '-')
 190                         sign = -1, s++;
 191                 intval = *s++-'0';
 192                 radix = 10;
 193                 if (intval == 0) {
 194                         switch(*s) {
 195
 196                         case 'x':
 197                                 radix = 16;
 198                                 s++;
 199                                 break;
 200
 201                         case 'b':
 202                                 radix = 2;
 203                                 s++;
 204                                 break;
 205
 206                         case '0': case '1': case '2': case '3':
 207                         case '4': case '5': case '6': case '7':
 208                                 intval = *s-'0';
 209                                 s++;
 210                                 radix = 8;
 211                                 break;
 212
 213                         default:
 214                                 if (!isargsep(*s))
 215                                         return (STR);
 216                         }
 217                 } else if (intval >= radix) {
 218                     return (STR);
 219                 }
 220                 for(;;) {
 221                         c = *s++;
 222                         if (isargsep(c))
 223                             break;
 224                         if ((radix <= 10) &&
 225                             ((c >= '0') && (c <= ('9' - (10 - radix))))) {
 226                                 c -= '0';
 227                         } else if ((radix == 16) &&
 228                                    ((c >= '0') && (c <= '9'))) {
 229                                 c -= '0';
 230                         } else if ((radix == 16) &&
 231                                    ((c >= 'a') && (c <= 'f'))) {
 232                                 c -= 'a' - 10;
 233                         } else if ((radix == 16) &&
 234                                    ((c >= 'A') && (c <= 'F'))) {
 235                                 c -= 'A' - 10;
 236                         } else if (c == 'k' || c == 'K') {
 237                                 sign *= 1024;
 238                                 break;
 239                         } else if (c == 'm' || c == 'M') {
 240                                 sign *= 1024 * 1024;
 241                                 break;
 242                         } else if (c == 'g' || c == 'G') {
 243                                 sign *= 1024 * 1024 * 1024;
 244                                 break;
 245                         } else {
 246                                 return (STR);
 247                         }
 248                         if (c >= radix)
 249                                 return (STR);
 250                         intval *= radix;
 251                         intval += c;
 252                 }
 253                 if (!isargsep(c) && !isargsep(*s))
 254                     return STR;
 255                 *val = intval * sign;
 256                 return (NUM);
 257         }
 258         *val = 1;
 259         return (NUM);
 260 }