dwm/patch/autostart.c

void
runautostart(void)
{
	char *pathpfx;
	char *path;
	char *xdgdatahome;
	char *home;
	struct stat sb;

	if ((home = getenv("HOME")) == NULL)
		/* this is almost impossible */
		return;

	/* if $XDG_DATA_HOME is set and not empty, use $XDG_DATA_HOME/dwm,
	 * otherwise use ~/.local/share/dwm as autostart script directory
	 */
	xdgdatahome = getenv("XDG_DATA_HOME");
	if (xdgdatahome != NULL && *xdgdatahome != '\0') {
		/* space for path segments, separators and nul */
		pathpfx = ecalloc(1, strlen(xdgdatahome) + strlen(dwmdir) + 2);

		if (sprintf(pathpfx, "%s/%s", xdgdatahome, dwmdir) <= 0) {
			free(pathpfx);
			return;
		}
	} else {
		/* space for path segments, separators and nul */
		pathpfx = ecalloc(1, strlen(home) + strlen(localshare)
							 + strlen(dwmdir) + 3);

		if (sprintf(pathpfx, "%s/%s/%s", home, localshare, dwmdir) < 0) {
			free(pathpfx);
			return;
		}
	}

	/* check if the autostart script directory exists */
	if (! (stat(pathpfx, &sb) == 0 && S_ISDIR(sb.st_mode))) {
		/* the XDG conformant path does not exist or is no directory
		 * so we try ~/.dwm instead
		 */
		char *pathpfx_new = realloc(pathpfx, strlen(home) + strlen(dwmdir) + 3);
		if(pathpfx_new == NULL) {
			free(pathpfx);
			return;
		}
		pathpfx = pathpfx_new;

		if (sprintf(pathpfx, "%s/.%s", home, dwmdir) <= 0) {
			free(pathpfx);
			return;
		}
	}

	/* try the blocking script first */
	path = ecalloc(1, strlen(pathpfx) + strlen(autostartblocksh) + 2);
	if (sprintf(path, "%s/%s", pathpfx, autostartblocksh) <= 0) {
		free(path);
		free(pathpfx);
	}

	if (access(path, X_OK) == 0)
		system(path);

	/* now the non-blocking script */
	if (sprintf(path, "%s/%s", pathpfx, autostartsh) <= 0) {
		free(path);
		free(pathpfx);
	}

	if (access(path, X_OK) == 0)
		system(strcat(path, " &"));

	free(pathpfx);
	free(path);
}