scan folder to search file

os2 · 03-03-2005, 11:53 AM

hi

in a c program, we need to scan a directory and find all: hist*.htm file

are there any special c function to do the job

thanks

itsme86 · 03-03-2005, 12:02 PM

Scanning a directory is implementation-dependent. Which OS and compiler are you using?

os2 · 03-03-2005, 12:07 PM

Quote:

Originally posted by itsme86
Scanning a directory is implementation-dependent. Which OS and compiler are you using?

we use linux and gcc (ppc)

os2 · 03-03-2005, 01:12 PM

the file i need to search are: hist_2005-02-24.htm..

hist_0000-00-00.htm

0 can be any number

i begining to write this code

Code:

int searchfile(char *history_dir, char *filename){
  DIR *pdir;
  pdir = opendir(history_dir);
  struct dirent *pent;
  if (!pdir){
    printf ("%s - Incapable d'utiliser opendir()", strerror (errno));
    return 1;
 }
 while ((pent=readdir(pdir))!=NULL){
   printf("%s", pent->d_name);
 }
  closedir(pdir);
  return 0;
}

itsme86 · 03-03-2005, 01:25 PM

You can do something like:

Code:

if(strncmp(pent->d_name, "hist", 4) == 0 && strcmp(pent->d_name+15, ".htm") == 0)
{
  // It's a match
}

Hko · 03-03-2005, 01:26 PM

I have made this some time ago.
I don't know if that's what you need, but it scans down sub-directories.

Change the line: #define FILENAME_FILTER "*.txt" to the shell pattern as you need.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <fnmatch.h>
#include <sys/types.h>
#include <unistd.h>
#include <dirent.h>

#define FILENAME_FILTER "*.txt"

int scandirectory(const char *dirname)
{
    DIR *dir;
    struct dirent *entry;
    char path[PATH_MAX];

    dir = opendir(dirname);
    if (dir == NULL) {
        perror("Error opendir()");
        return 0;
    }
    while ((entry = readdir(dir)) != NULL) {
        if (entry->d_type == DT_DIR) {
            if (strcmp(entry->d_name, ".")
                && strcmp(entry->d_name, "..")) {
                snprintf(path, (size_t) PATH_MAX, "%s/%s", dirname,
                         entry->d_name);
                scandirectory(path);
            }
        } else if (entry->d_type == DT_REG) {
            if (!fnmatch(FILENAME_FILTER, entry->d_name, 0)) {

                /*
                 * This is the place where a file matching the filter is
                 * found. Do file processing here, in this case, just print. 
                 */

                printf("%s/%s\n", dirname, entry->d_name);
            }
        }
    }
    closedir(dir);
    return 1;
}


int main(int argc, char *argv[])
{
    if (argc != 2) {
        fprintf(stderr, "Usage:\t%s <directory>\n", *argv);
        return 1;
    }
    return !scandirectory(argv[1]);
}

Hko · 03-03-2005, 01:33 PM

-- Accidental double post.
-- Please ignore/remove.

itsme86 · 03-03-2005, 01:37 PM

Huh, I never came across fnmatch() before. That's cool.