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/*
* This file contains a function, get_dir_list() that will get a directory
* listing and put all the names into a table (an array of char *'s table)
* and return it to you (along with the number of entries in the directory
* if desired). The table is NULL terminated (i.e. the entry after the last
* one is a NULL), and is just like an argv style array.
*
* If an error occurs (memory allocation, bad directory name, etc), you
* will get a NULL back.
*
* Each entry of the returned table points to a NULL-terminated string
* that contains the name of a file in the directory. If the name is
* a directory, it has a slash appended to it.
*
* When you are done with the table, you should free it manually, or you
* can call the function free_table() provided down below.
*
* See the sample main() down below for how to use it. Ignore (or steal
* if you'd like) the other code that isn't particularly relevant (i.e.
* the support functions).
*
* Dominic Giampaolo
* dbg@sgi.com
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <dirent.h>
#include <sys/param.h>
#include <sys/stat.h>
extern char * freq_filter;
void free_table(char **table, int n)
{
char **orig = table;
for(; n > 0; n--, table++)
{
if (*table)
free(*table);
}
free(orig);
}
void free_dirlist(char **table)
{
char **orig = table;
while(*table)
{
free(*table);
table++;
}
free(orig);
}
int
dup_strcmp(char **a, char **b)
{
return strcmp(*a, *b);
}
char *get_file_name(struct dirent *d)
{
struct stat s;
char *name;
if (d == NULL)
{
fprintf(stderr, "BUG BUG BUG (got a NULL in get_file_name()).\n");
return NULL;
}
if (stat(d->d_name, &s) < 0)
{
perror(d->d_name);
return NULL;
}
if (S_ISDIR(s.st_mode))
{
name = (char *)malloc(strlen(d->d_name)+2);
if (name == NULL)
return NULL;
sprintf(name, "%s/", d->d_name);
}
else
{
name = (char *)strdup(d->d_name);
}
return name;
}
int freq_filter_check(char *scanit)
{
struct stat buf;
if (scanit == NULL) return 1;
if (!strcmp(scanit, "./")) return 1;
stat(scanit, &buf);
if (S_ISDIR(buf.st_mode)) return 0;
if (*freq_filter==0) return 0;
if (strstr(scanit, freq_filter))
return 0;
else
return 1;
}
#define CHUNK 100
char **get_dir_list(char *dirname, int *num_entries)
{
int i,size=CHUNK;
char **table, old_dir[MAXPATHLEN];
DIR *dir;
struct dirent *dirent;
getcwd(old_dir, MAXPATHLEN);
if (dirname && chdir(dirname) < 0)
return NULL;
dir = opendir(".");
if (dir == NULL)
{
chdir(old_dir);
return NULL;
}
table = (char **)calloc(size, sizeof(char *));
if (table == NULL)
{
closedir(dir);
chdir(old_dir);
return NULL;
}
dirent = NULL; i = 0;
for(dirent = readdir(dir); dirent != NULL; dirent = readdir(dir))
{
table[i] = get_file_name(dirent);
if (freq_filter_check(table[i])) continue;
/* continue if table[i] is void or doesn't match the filter */
i++;
if (i == size)
{
char **table2;
size *= 2;
table2 = (char **)realloc(table, size * sizeof(char *));
if (table2 == NULL)
{
free_table(table, i);
closedir(dir);
chdir(old_dir);
return NULL;
}
table = table2;
}
}
table[i] = NULL; /* make sure the table ends with a NULL */
if (num_entries)
*num_entries = i;
closedir(dir);
chdir(old_dir);
return table;
}
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