+
+/* Resolve the special FileIn paths ("-" or "-<<END" or filename).
+ * The caller (cmds.c) will call free_file_in after the command has
+ * run which should clean up resources.
+ */
+static char *file_in_heredoc (const char *endmarker);
+static char *file_in_tmpfile = NULL;
+
+char *
+file_in (const char *arg)
+{
+ char *ret;
+
+ if (STREQ (arg, "-")) {
+ ret = strdup ("/dev/stdin");
+ if (!ret) {
+ perror ("strdup");
+ return NULL;
+ }
+ }
+ else if (STRPREFIX (arg, "-<<")) {
+ const char *endmarker = &arg[3];
+ if (*endmarker == '\0') {
+ fprintf (stderr, "%s: missing end marker in -<< expression\n",
+ program_name);
+ return NULL;
+ }
+ ret = file_in_heredoc (endmarker);
+ if (ret == NULL)
+ return NULL;
+ }
+ else {
+ ret = strdup (arg);
+ if (!ret) {
+ perror ("strdup");
+ return NULL;
+ }
+ }
+
+ return ret;
+}
+
+static char *
+file_in_heredoc (const char *endmarker)
+{
+ static const char template[] = "/tmp/heredocXXXXXX";
+ file_in_tmpfile = strdup (template);
+ if (file_in_tmpfile == NULL) {
+ perror ("strdup");
+ return NULL;
+ }
+
+ int fd = mkstemp (file_in_tmpfile);
+ if (fd == -1) {
+ perror ("mkstemp");
+ goto error1;
+ }
+
+ size_t markerlen = strlen (endmarker);
+
+ char buffer[BUFSIZ];
+ int write_error = 0;
+ while (fgets (buffer, sizeof buffer, stdin) != NULL) {
+ /* Look for "END"<EOF> or "END\n" in input. */
+ size_t blen = strlen (buffer);
+ if (STREQLEN (buffer, endmarker, markerlen) &&
+ (blen == markerlen ||
+ (blen == markerlen+1 && buffer[markerlen] == '\n')))
+ goto found_end;
+
+ if (xwrite (fd, buffer, blen) == -1) {
+ if (!write_error) perror ("write");
+ write_error = 1;
+ /* continue reading up to the end marker */
+ }
+ }
+
+ /* Reached EOF of stdin without finding the end marker, which
+ * is likely to be an error.
+ */
+ fprintf (stderr, "%s: end of input reached without finding '%s'\n",
+ program_name, endmarker);
+ goto error2;
+
+ found_end:
+ if (write_error) {
+ close (fd);
+ goto error2;
+ }
+
+ if (close (fd) == -1) {
+ perror ("close");
+ goto error2;
+ }
+
+ return file_in_tmpfile;
+
+ error2:
+ unlink (file_in_tmpfile);
+
+ error1:
+ free (file_in_tmpfile);
+ file_in_tmpfile = NULL;
+ return NULL;
+}
+
+void
+free_file_in (char *s)
+{
+ if (file_in_tmpfile) {
+ if (unlink (file_in_tmpfile) == -1)
+ perror (file_in_tmpfile);
+ file_in_tmpfile = NULL;
+ }
+
+ /* Free the device or file name which was strdup'd in file_in().
+ * Note it's not immediately clear, but for -<< heredocs,
+ * s == file_in_tmpfile, so this frees up that buffer.
+ */
+ free (s);
+}
+
+/* Resolve the special FileOut paths ("-" or filename).
+ * The caller (cmds.c) will call free (str) after the command has run.
+ */
+char *
+file_out (const char *arg)
+{
+ char *ret;
+
+ if (STREQ (arg, "-"))
+ ret = strdup ("/dev/stdout");
+ else
+ ret = strdup (arg);
+
+ if (!ret) {
+ perror ("strdup");
+ return NULL;
+ }
+ return ret;
+}
git.annexia.org / libguestfs.git / blobdiff