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[gapil.git] / sources / dir_scan.c

diff --git a/sources/dir_scan.c b/sources/dir_scan.c
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+/* dir_scan.c
+ * 
+ * Copyright (C) 2002 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*****************************************************************************
+ *
+ * File dir_scan.c: routine for directory scan 
+ *
+ * Author: S. Piccardi Jan. 2003
+ *
+ *****************************************************************************/
+#include <sys/types.h>   /* primitive system data types */
+#include <sys/stat.h>    /* file characteristics constants and functions */
+#include <dirent.h>      /* directory operation constants and functions */
+#include <stdlib.h>      /* C standard library */
+#include <stdio.h>      /* standard I/O library */
+#include <unistd.h>      /* unix standard library */
+
+/*
+ * Function dir_scan: 
+ * 
+ * Scan all entries in a directory, executing the provided function
+ * on each one.
+ *
+ * Input:  the directory name and a computation function
+ * Return: 0 if OK, -1 on errors
+ */
+int dir_scan(char * dirname, int(*compute)(struct dirent *)) 
+{
+    DIR * dir;
+    struct dirent *direntry;
+    int fd;
+
+    if ( (dir = opendir(dirname)) == NULL) {               /* oper directory */
+       printf("Opening %s\n", dirname);          /* on error print messages */
+       perror("Cannot open directory");                  /* and then return */
+       return -1;
+    }
+    fd = dirfd(dir);                                  /* get file descriptor */
+    fchdir(fd);                                          /* change directory */
+    /* loop on directory entries */
+    while ( (direntry = readdir(dir)) != NULL) {               /* read entry */
+       if (compute(direntry)) {                   /* execute function on it */
+           return -1;                                    /* on error return */
+       }
+    }
+    closedir(dir);
+    return 0;
+}