file_age.c

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <sys/time.h>
 
/* returns the age of a file in hours */
 
int file_age(char *directory, char *file, int debug)
{
FILE *pf, *popen();
char fmt[80];
char filename[256];
char line[256];
char info[256];
int age;
int yr,mo,dy,hr,mn,sd;
float fsd;
long t_file,t_system;
 
  strcpy(filename,directory);
  strcat(filename,"/");
  strcat(filename,file);
 
  if(debug)
  {
    printf("dir:   <%s>\n",directory);
    printf("file:  <%s>\n",file);
    printf("both:  <%s>\n",filename);
  }
 
  strncpy(fmt,"%z",2);
  *(fmt+2)='\0';
  sprintf(line,"stat -c %s %s",fmt,filename);
 
  if(debug)
    printf("cmd: <%s>\n",line);
 
  pf=popen(line,"r");
  fgets(info,sizeof(info),pf);
  if(debug)
    printf("info: <%s>\n",info);
  pclose(pf);
 
  if(strlen(info) < 10)
  {
    if(debug)
      printf("File does not exist.\n");
    age=-1;
  }
  else
  {
    sscanf(info,"%d-%d-%d %d:%d:%f",&yr,&mo,&dy,&hr,&mn,&fsd);
    sd=(int)fsd;
    if(debug)
      printf("%02d/%02d/%04d %02d:%02d:%02d\n",mo,dy,yr,hr,mn,sd);
 
    t_file=ouptime(yr,mo,dy,hr,mn,sd);
    if(debug)
      printf("file_time: %d\n",t_file);
 
    strncpy(fmt,"'+%Y %m %d %H %M %S'",20);
    *(fmt+20)='\0';
    sprintf(line,"date %s",fmt);
    if(debug)
      printf("cmd: <%s>\n",line);
    pf=popen(line,"r");
    fgets(info,sizeof(info),pf);
    if(debug)
      printf("info: <%s>\n",info);
    pclose(pf);
 
    sscanf(info,"%d %d %d %d %d %d",&yr,&mo,&dy,&hr,&mn,&sd);
    t_system=ouptime(yr,mo,dy,hr,mn,sd);
    if(debug)
      printf("system_time: %d\n",t_system);
 
    age=(int)((t_system - t_file)/3600);
   
  }
  if(debug)
    printf("file_age is %d hrs.\n",age);
 
  return(age);
}