lib/sysutil/env_get_prm.c

   1 #include "sysutil.h"
   2 #include <minix/config.h>
   3 #include <string.h>
   4
   5 PRIVATE int argc = 0;
   6 PRIVATE char **argv = NULL;
   7
   8 FORWARD _PROTOTYPE( char *find_key, (const char *params, const char *key));
   9
  10 /*===========================================================================*
  11  *                              env_setargs                                  *
  12  *===========================================================================*/
  13 PUBLIC void env_setargs(arg_c, arg_v)
  14 int arg_c;
  15 char *arg_v[];
  16 {
  17         argc= arg_c;
  18         argv= arg_v;
  19 }
  20
  21 /*===========================================================================*
  22  *                              env_get_param                                *
  23  *===========================================================================*/
  24 PUBLIC int env_get_param(key, value, max_len)
  25 char *key;                              /* which key to look up */
  26 char *value;                            /* where to store value */
  27 int max_len;                            /* maximum length of value */
  28 {
  29   message m;
  30   static char mon_params[128*sizeof(char *)];   /* copy parameters here */
  31   char *key_value;
  32   int i, s, keylen;
  33
  34   if (key == NULL)
  35         return EINVAL;
  36
  37   keylen= strlen(key);
  38   for (i= 1; i<argc; i++)
  39   {
  40         if (strncmp(argv[i], key, keylen) != 0)
  41                 continue;
  42         if (strlen(argv[i]) <= keylen)
  43                 continue;
  44         if (argv[i][keylen] != '=')
  45                 continue;
  46         key_value= argv[i]+keylen+1;
  47         if (strlen(key_value)+1 > EP_BUF_SIZE)
  48               return(E2BIG);
  49         strcpy(value, key_value);
  50         return OK;
  51   }
  52
  53   /* Get copy of boot monitor parameters. */
  54   m.m_type = SYS_GETINFO;
  55   m.I_REQUEST = GET_MONPARAMS;
  56   m.I_ENDPT = SELF;
  57   m.I_VAL_LEN = sizeof(mon_params);
  58   m.I_VAL_PTR = mon_params;
  59   if ((s=_taskcall(SYSTASK, SYS_GETINFO, &m)) != OK) {
  60         printf("SYS_GETINFO: %d (size %u)\n", s, sizeof(mon_params));
  61         return(s);
  62   }
  63
  64   /* We got a copy, now search requested key. */
  65   if ((key_value = find_key(mon_params, key)) == NULL)
  66         return(ESRCH);
  67
  68   /* Value found, make the actual copy (as far as possible). */
  69   strncpy(value, key_value, max_len);
  70
  71   /* See if it fits in the client's buffer. */
  72   if ((strlen(key_value)+1) > max_len) return(E2BIG);
  73   return(OK);
  74 }
  75
  76
  77 /*==========================================================================*
  78  *                              find_key                                            *
  79  *==========================================================================*/
  80 PRIVATE char *find_key(params,name)
  81 const char *params;
  82 const char *name;
  83 {
  84   register const char *namep;
  85   register char *envp;
  86
  87   for (envp = (char *) params; *envp != 0;) {
  88         for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
  89                 ;
  90         if (*namep == '\0' && *envp == '=')
  91                 return(envp + 1);
  92         while (*envp++ != 0)
  93                 ;
  94   }
  95   return(NULL);
  96 }
  97