finally put this under version control

mvwtimg.c

@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <string.h>
+#include <skalibs/buffer.h>
+#include <skalibs/skamisc.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/strerr.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/exec.h>
+
+#define USAGE "mvwtimg host path filename"
+#define HTTPOK "HTTP/1.1 200 OK"
+
+int
+download(int infd, char *path)
+{
+	int outfd;
+
+	outfd = open_trunc(path);
+	if (outfd < 0)
+		return -1;
+
+	if (fd_cat(infd, outfd) < 0) {
+		fd_close(outfd);
+		return -1;
+	}
+
+	fd_sync(outfd);
+	fd_close(outfd);
+	
+	return 0;
+}
+
+int
+fdgetln(int fd, stralloc *sa, int sep)
+{
+	char s[1];
+	ssize_t r;
+
+	sa->len = 0;
+	for (;;) {
+		r = fd_read(fd, s, 1);
+		if (r < 0)
+			return -1;
+		if (s[0] == EOF)
+			break;
+		stralloc_append(sa, s[0]);
+		if (s[0] == sep)
+			break;
+	}
+	return 0;
+}
+
+int
+http_recv_header(int fd)
+{
+	stralloc sa = STRALLOC_ZERO;
+
+	if (fdgetln(fd, &sa, '\n') < 0)
+		return -1;
+	if (sa.len < sizeof(HTTPOK) || !strncmp(sa.s, HTTPOK, sizeof(HTTPOK)))
+		return -1;
+	sa.len = 0;
+
+	for (;;) {
+		if (fdgetln(fd, &sa, '\n') < 0)
+			return -1;
+		if (!strncmp(sa.s, "\r\n", 2)) {
+			break;
+		}
+		sa.len = 0;
+	}
+
+	stralloc_free(&sa);
+
+	return 0;
+}
+
+int
+http_send(int fd, char *path, char *host)
+{
+	char buf[BUFFER_OUTSIZE];
+
+	buffer b = BUFFER_INIT(&buffer_write, fd, buf, BUFFER_OUTSIZE);
+
+	buffer_putsnoflush(&b, "GET ");
+	buffer_putsnoflush(&b, path);
+	buffer_putsnoflush(&b, " HTTP/1.0\r\n");
+	buffer_putsnoflush(&b, "Host: ");
+	buffer_putsnoflush(&b, host);
+	buffer_putsnoflush(&b, "\r\nConnection: close\r\n");
+	buffer_putsnoflush(&b, "User-Agent: mvwt\r\n\r\n");
+	buffer_flush(&b);
+
+	return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+	PROG = "mvwtimg";
+
+	if (argc != 4)
+		strerr_dieusage(100, USAGE);
+
+	if (http_send(7, argv[2], argv[1]) < 0)
+		strerr_diefu(111, "send http request");
+	if (http_recv_header(6) < 0)
+		strerr_diefu(111, "recieve image header");
+	if (download(6, argv[3]) < 0)
+		strerr_diefu(111, "downloading and saving image");
+	fd_shutdown(7, 1);
+	fd_close(7);
+	fd_shutdown(6, 0);
+	fd_close(6);
+
+	char const *hsetroot_argv[] = { "hsetroot", "-cover", argv[3], 0 };
+	xexec(hsetroot_argv);
+	return 0;
+}