RE: recursion calls

["Urbanek, Marty" <Marty_Urbanek@xxxxxxxxxxxx>]

Heba,

You can do recursive calls in C and C++.

Here is a C program I posted a few weeks ago for listing files in IFS. It
uses recursion to go through the directory tree. When the listdir function
encounters a subdirectory entry it calls itself. Beware, this pgm was just
slapped together and may not be "ready for prime time".

-Marty

/*********************************************************************/
/*                                                                   */
/*********************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>

void listdir(char *dirparm);

int main(int argc, char *argv[]) {
    char inparm[201];

    if (argc < 2) {
      fprintf(stderr,"PARM ERROR - NO PATH SPECIFIED");
      return 1;
    }
    sscanf(argv[1], "%s ", inparm);     /* make copy w/ null term */
    listdir(inparm);
    return 0;
}

void listdir(char *dirparm) {
    char inparm[1025];
    struct stat info;
    DIR *dir;
    struct dirent *entry;
    char path[1025];

    sscanf(dirparm, "%s ", inparm);     /* make copy w/ null term */

    if ((dir = opendir(inparm)) == NULL)
      perror("opendir() error");
    else {
/*    printf("contents of dir %s:\n", inparm);   */
      while ((entry = readdir(dir)) != NULL) {
        sprintf(path, "%s/%s", inparm, entry->d_name);
        if (stat(path, &info) != 0) {
            fprintf(stderr, "stat() error on %s: %s\n", path,
               strerror(errno));
        }
        /* print name only if it is a regular file (no dirs, etc) */
        if (S_ISREG(info.st_mode))
        /*  printf("%s/%s\n", inparm, entry->d_name); */
            printf("%s\n", path);
        /* recurse for dirs, but not . and .. */
        if ((S_ISDIR(info.st_mode)) && (entry->d_name[0] != '.'))
/*          printf("DIR>%s\n", path);   */
            listdir(path);
      }
      closedir(dir);
    }
    return;
}
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