altri pezzi di codice da aggiungere

[gapil.git] / listati / DirScan.c

diff --git a/listati/DirScan.c b/listati/DirScan.c
new file mode 100644 (file)
index 0000000..725b524
--- /dev/null
+++ b/listati/DirScan.c
@@ -0,0 +1,33 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>        /* directory */
+#include <stdlib.h>        /* C standard library */
+#include <unistd.h>
+
+/*
+ * Function DirScan: 
+ * 
+ * Input:  the directory name and a computation function
+ * Return: 0 if OK, -1 on errors
+ */
+int DirScan(char * dirname, int(*compute)(struct dirent *)) 
+{
+    DIR * dir;
+    struct dirent *direntry;
+
+    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;
+}