Thread: Path problems

I'm in the middle of implementing ps, except I have a problem with the concatenation of some of my paths. It's supposed to look like this

/proc/xxx/stat

Where xxx is the process id, instead I get this

/proc/xxx/xxx/stat

Code:

/*This program will scan through a directory
 if it finds subdirectories within it, it will
 check if the name of the directory is a digit
 if it is it will return 1, otherwise a 0. Based
 upon the return value, the program will print the
 filename which was matched i.e. 1 was returned. */

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <regex.h>
#include <unistd.h>

/*prototypes*/
int matchDetails(char* filename,char* path);
void printDetails(char* filename,char* path);
char *get_regerror(int errcode,regex_t *compiled);

int main(void){
  int result,count,index;   /*Set Conditions*/
  char path[] = "/proc";    /*Path to the proc directory*/
  struct dirent **direntp;  /*Directory entry pointer*/
  struct stat sbuf;         /*Holds information about files*/

  if (stat(path,&sbuf) != -1){
    if(S_ISDIR(sbuf.st_mode)){
       count = scandir(path,&direntp,NULL,alphasort);
       if(count){
         char temp[FILENAME_MAX];
         printf("PID\tTTY\t\tTIME\tCMD\n");
         for(index=0; index<count; ++index){
           strcpy(temp,path);
           result = matchDetails(direntp[index]->d_name,temp);
           if(result > 0)   /*If directory name was matched*/
             printDetails(direntp[index]->d_name,temp);
           free(direntp[index]);
         }
       }else{
         fprintf(stderr,"Can't open %s\n",path);
         exit(EXIT_FAILURE);
       }
    }else
      return;
  }else{
    fprintf(stderr,"Can't stat %s\n",path);
    return;
  } 
  return EXIT_SUCCESS;
}

/*Used to find process directories*/
int matchDetails(char* filename,char* path){
  int status,regstat;
  char *pattern = "[0-9]+"; /*Match digits only*/
  char *result;
  struct stat sbuf;

  /*Get the full pathname*/
  strcat(path,"/");
  strcat(path,filename);

  /*Stat the full path name*/
  if(stat(path,&sbuf) != -1){
    if(S_ISDIR(sbuf.st_mode)){ /*If a directory*/
      regex_t re;
      if((regstat = regcomp(&re,pattern,REG_EXTENDED | REG_NOSUB)) != 0){
        result = get_regerror(regstat,&re);
        fprintf(stderr,"%s\n",result);
        return(0);
      }
      if((status = regexec(&re,filename,(size_t) 0,NULL,0)) != 0)
        return(0);
      regfree(&re);
    }else
      return(0);
  }else{
    fprintf(stderr,"Can't stat %s\n",filename);
    return(0);
  }
  return(1);

}

/*Print the process information*/
void printDetails(char* filename,char* path){
  FILE *f_name;
  int pid;

  /*Format the path*/
  strcat(path,"/");
  strcat(path,filename);
  strcat(path,"/");
  strcat(path,"stat");

  if((f_name = fopen(path,"r")) != NULL){
    fscanf(f_name,"%d",pid);
    printf("%d\n",pid);
    fclose(f_name);
  }else
    fprintf(stderr,"Can't open %s\n",path);

}

/*Used to store regex errors*/
char *get_regerror(int errcode,regex_t *compiled){
  size_t length = regerror(errcode,compiled,NULL,0);
  char *buffer = malloc(length);
  (void) regerror(errcode,compiled,buffer,length);
  return buffer;
}