#include <fcntl.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/types.h>
#include "debug.h"
#include "sysfs.h"

// Validate if we found a file named cpu[0-9][0-9]
int cpufreq_is_cpu(char *name)
{
 if (strncmp(name,"cpu",3)!=0) return 0;
 if ((name[3]<'0') || (name[3]>'9')) return 0;
 if (name[4]==0) return 1;

 if ((name[4]<'0') || (name[4]>'9')) return 0;
 if (name[5]==0) return 1;

 return 0;
}

// Set a cpufreq parameter to a value
int cpufreq_set_str(char *parameter,char *value,long int checkdelay)
{
 DIR *cpudir;
 struct dirent *cpu_dirent;
 char sysfs_file[128];
 int done=0;

 DEBUG1_CPUFREQ("Set %s to %s\n",parameter,value)

// Open the CPU directory in sysfs
 cpudir=opendir("/sys/devices/system/cpu");
 if (cpudir==NULL)
 {
  DEBUG1_CPUFREQ("Unable to find CPU's\n");
  return -1;
 }

 cpu_dirent=readdir(cpudir);
 while(cpu_dirent!=NULL)
 {
// If it's a CPU, set our parameter
  if (cpufreq_is_cpu(cpu_dirent->d_name))
  {
   DEBUG2_CPUFREQ("Found CPU %s\n",cpu_dirent->d_name);
   snprintf(sysfs_file,128,"/sys/devices/system/cpu/%s/cpufreq/%s",cpu_dirent->d_name,parameter);
   if (sysfs_write_str(sysfs_file,value,checkdelay)!=0)
   {
    DEBUG1_CPUFREQ("Failed to set %s\n",cpu_dirent->d_name);
    closedir(cpudir);
    return -1;
   }
   done++;
  }

  cpu_dirent=readdir(cpudir);
 }
 closedir(cpudir);

 return done;
}

// This is just a wrapper around cpufreq_set_str with long int to string
// conversion
int cpufreq_set_long_int(char *parameter,long int value,long int checkdelay)
{
 char buf[255];

 snprintf(buf,255,"%ld",value);
 return cpufreq_set_str(parameter,buf,checkdelay);
}