env.c

ADAM2 sources (modified by Oleg)

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/*-----------------------------------------------------------------------------*/

#include "_stdio.h"
#include "env.h"
#include "flashop.h"
#include "hw.h"
#include "sio.h"
#include "shell.h"

t_env_var env_vars[SYS_USER_ENVIRONMENT_MAX_INDEX];

/*control,checksum,index,size,name,val                                       */
/*42/ff   sum      env   ##   ascii                                          */

int sys_unsetenv(char *var)
  {
  return(sys_setenv(var,0));
  }

char *EnvGetEnvBase(int *bs)
  {
  int blocksize;
  bit32u itmp;

  blocksize=FWBGetBlockSize(CS0_BASE);
  if (blocksize<(MIN_ENV_BLOCK_SIZE)) blocksize=MIN_ENV_BLOCK_SIZE;
  *bs=blocksize;
  itmp=(CS0_BASE+CS0_SIZE)-blocksize;
  return((char *)itmp);
  }

int EnvInit(void)
  {
  char *fb,*cp,control;
  int i,sts,blocksize;
#ifdef ACPEP
  FWBGet_flash_type();
#endif /* ACPEP */

  cp=fb=EnvGetEnvBase(&blocksize);
  control=*fb;
  if (control==0x42)
    return(TRUE);
  for(i=0;(i<128)&&(*fb==((char)0xff));i++,fb++)
    {
    }
  if (i==128)
    return(TRUE);
  
  /*Env flash is invalid!                                                    */
#ifdef _STAND_ALONE_
  SioReset();
#endif
  sts=FWBErase((bit32u)cp,blocksize,0);
    
  return(sts==0);
  }

int setenv(char *var,char *val)
  {
  char *nfe,*cfe,checksum,esum,control,*s1ptr,*s2ptr,*fb,*wfe,envrec[FLASH_ENV_ENTRY_SIZE],*cp,*eval,*evar;
  int varindex,index,size,s1len,s2len,done,i,highest,blocksize,j;

  varindex=-1;
  highest=0;
  fb=EnvGetEnvBase(&blocksize);
  for(done=FALSE,wfe=cfe=fb,i=0;(!done)&&(i<MAX_ENV_ENTRY);i++,cfe=nfe)
    {
  	if (cfe>=(fb+blocksize)) return(4);
    wfe=cfe;
    nfe=cfe+FLASH_ENV_ENTRY_SIZE;
    control=*cfe++;
    checksum=*cfe++;
    index=((int)*cfe++)&0x0ff;
    size=(control==0x42)?(((int)*cfe++)&0x0ff):0;
    if (size>(FLASH_ENV_ENTRY_SIZE-4)) 
      return(1);
    s1ptr=cfe;
    s1len=((control==0x42)&&(size))?strlen(s1ptr):0;
    if (s1len>(FLASH_ENV_ENTRY_SIZE-5)) 
      return(1);
    s2ptr=cfe+s1len+1;
    s2len=((control==0x42)&&(size))?strlen(s2ptr):0;
    if (s2len>(FLASH_ENV_ENTRY_SIZE-5)) 
      return(1);
    if ((s2len+s1len)>(FLASH_ENV_ENTRY_SIZE-6))
      return(1);
    esum=0;
    for(j=0;j<size;j++) esum+=s1ptr[j];

    if (control==(char)0xff) done=TRUE;
    if ((control!=(char)0x42)&&(control!=(char)0xff)) return(1);
    if (control==0x42)
      {
      if (checksum!=esum) return(2);
      if ((size)&&((size<(s1len+s2len+2))||(size>(s1len+s2len+2+3)))) return(3);
      if (size)
        {
        if (index>highest) highest=index;
        if (strcmp(s1ptr,var)==0)
          varindex=index;
        }
       else
        {
        if (index==highest) highest=index-1; /*last env deleted!             */
        if (varindex==index) varindex=-1;
        }
      }
    }
  if (i>=MAX_ENV_ENTRY) return(4);

  /*See if the current value is what we want!                                */