pgfnames.c

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/*-------------------------------------------------------------------------
 *
 * pgfnames.c
 *    directory handling functions
 *
 * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *    src/common/pgfnames.c
 *
 *-------------------------------------------------------------------------
 */
 
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
 
#include <dirent.h>
 
#ifndef FRONTEND
#define pg_log_warning(...) elog(WARNING, __VA_ARGS__)
#else
#include "common/logging.h"
#endif
 
/*
 * pgfnames
 *
 * return a list of the names of objects in the argument directory.  Caller
 * must call pgfnames_cleanup later to free the memory allocated by this
 * function.
 */
char      **
pgfnames(const char *path)
{
    DIR        *dir;
    struct dirent *file;
    char      **filenames;
    int         numnames = 0;
    int         fnsize = 200;   /* enough for many small dbs */
 
    dir = opendir(path);
    if (dir == NULL)
    {
        pg_log_warning("could not open directory \"%s\": %m", path);
        return NULL;
    }
 
    filenames = (char **) palloc(fnsize * sizeof(char *));
 
    while (errno = 0, (file = readdir(dir)) != NULL)
    {
        if (strcmp(file->d_name, ".") != 0 && strcmp(file->d_name, "..") != 0)
        {
            if (numnames + 1 >= fnsize)
            {
                fnsize *= 2;
                filenames = (char **) repalloc(filenames,
                                               fnsize * sizeof(char *));
            }
            filenames[numnames++] = pstrdup(file->d_name);
        }
    }
 
    if (errno)
        pg_log_warning("could not read directory \"%s\": %m", path);
 
    filenames[numnames] = NULL;
 
    if (closedir(dir))
        pg_log_warning("could not close directory \"%s\": %m", path);
 
    return filenames;
}
 
 
/*
 *  pgfnames_cleanup
 *
 *  deallocate memory used for filenames
 */
void
pgfnames_cleanup(char **filenames)
{
    char      **fn;
 
    for (fn = filenames; *fn; fn++)
        pfree(*fn);
 
    pfree(filenames);
}