C, GLib: Is there a method to get the size - can be applied to text file, binary file, folder, and symbolic link in common?

Question

// gcc z.c -o z $(pkg-config --cflags --libs gtk+-2.0) #include <string.h> #include <gtk/gtk.h> #include <gdk/gdkkeysyms.h> struct tst { GtkWidget *win, *vb, *ent, *btn, *lbl; GtkAccelGroup *acc; GClosure *cls; }; static void print_val(struct tst *prg) { const char *nam = gtk_entry_get_text(GTK_ENTRY(prg->ent)); char *cont; g_file_get_contents(nam, &cont, NULL, NULL); int siz = strlen(cont); g_printf("%d\n", siz); } static void window_new() { struct tst *prg = g_new0(struct tst, 1); prg->win = gtk_window_new(GTK_WINDOW_TOPLEVEL); prg->vb = gtk_vbox_new(TRUE, 0); prg->ent = gtk_entry_new(); prg->btn = gtk_button_new_with_label("Print!"); prg->lbl = gtk_label_new("Enter the string."); gtk_container_add(GTK_CONTAINER(prg->win), GTK_WIDGET(prg->vb)); gtk_box_pack_start(GTK_BOX(prg->vb), GTK_WIDGET(prg->ent), FALSE, FALSE, 0); gtk_box_pack_start(GTK_BOX(prg->vb), GTK_WIDGET(prg->btn), FALSE, FALSE, 0); gtk_box_pack_start(GTK_BOX(prg->vb), GTK_WIDGET(prg->lbl), FALSE, FALSE, 0); g_signal_connect_swapped(prg->win, "destroy", G_CALLBACK(gtk_main_quit), NULL); g_signal_connect_swapped(prg->btn, "clicked", G_CALLBACK(print_val), prg); gtk_window_set_title(GTK_WINDOW(prg->win), "Enter the string"); gtk_widget_show_all(GTK_WIDGET(prg->win)); } int main(int argc, char *argv[]) { gtk_init(&argc, &argv); window_new(); gtk_main(); return 0; }

With g_file_get_contents(), at least in this example program, I can get the size of text file, but I can't get the size of binary file, folder, and symbolic link.

When I try to get the size of binary file with that, it gives the weird value, not the size of binary file.

When I try to get the size of folder with that, it crashes with segmentation fault.

And when I try to get the size of symbolic link with that, it gives the size of regular file which link refers, not link itself.

Is there a method to get the size - can be applied to text file, binary file, folder, and symbolic link in common?

I believe the second parameter of g_file_get_contents (gSize *length) works, at least for binary types. I don't think it's going to work for directories and sym links, however. — GabrielF
– GabrielF, Commented Jan 3, 2014 at 13:36

geekosaur · Accepted Answer · 2011-03-19 03:37:31Z

The usual way is

#include <sys/stat.h> struct stat st; if (lstat(filepath, &st) == -1) { perror(filepath); exit(1); } filesize = st.st_size;

Note that with lstat() the size reported will be the size of the symlink itself, not the object it references; if you didn't actually want the symlink's own size, use stat() instead.

atx · Accepted Answer · 2011-03-19 03:36:21Z

You might have to use realpath() to resolve the symbolic links. After that you could just use fstat().

struct stat *s; int fd; s = malloc(sizeof(struct stat)); fd = open("somefile", O_RDONLY); fstat(fd, s); printf("%d\n", s->st_size);

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