General utilities cleanup. Add signature support to catcrypt. Throw in

[u/mdw/catacomb] / cc-subcmd.c

diff --git a/cc-subcmd.c b/cc-subcmd.c
new file mode 100644 (file)
index 0000000..9af70e1
--- /dev/null
+++ b/cc-subcmd.c
@@ -0,0 +1,109 @@
+/* -*-c-*-
+ *
+ * $Id$
+ *
+ * Subcommand infrastructure
+ *
+ * (c) 2004 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/quis.h>
+#include <mLib/report.h>
+
+#include "cc.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @findcmd@ --- *
+ *
+ * Arguments:  @const cmd *cmds@ = pointer to command table
+ *             @const char *name@ = a command name
+ *
+ * Returns:    Pointer to the command structure.
+ *
+ * Use:                Looks up a command by name.  If the command isn't found, an
+ *             error is reported and the program is terminated.
+ */
+
+const cmd *findcmd(const cmd *cmds, const char *name)
+{
+  const cmd *c, *chosen = 0;
+  size_t sz = strlen(name);
+
+  for (c = cmds; c->name; c++) {
+    if (strncmp(name, c->name, sz) == 0) {
+      if (c->name[sz] == 0) {
+       chosen = c;
+       break;
+      } else if (chosen)
+       die(EXIT_FAILURE, "ambiguous command name `%s'", name);
+      else
+       chosen = c;
+    }
+  }
+  if (!chosen)
+    die(EXIT_FAILURE, "unknown command name `%s'", name);
+  return (chosen);
+}
+
+/* --- @sc_help@ --- *
+ *
+ * Arguments:  @const cmd *cmds@ = pointer to command table
+ *             @FILE *fp@ = output file handle
+ *             @char *const *argv@ = remaining arguments
+ *
+ * Returns:    ---
+ *
+ * Use:                Prints a help message, maybe with help about subcommands.
+ */
+
+void sc_help(const cmd *cmds, FILE *fp, char *const *argv)
+{
+  const cmd *c;
+
+  version(fp);
+  fputc('\n', fp);
+  if (!*argv) {
+    help_global(fp);
+    fputs("\n\
+The following commands are understood:\n\n",
+         fp);
+    for (c = cmds; c->name; c++)
+      fprintf(fp, "%s\n", c->usage);
+  } else {
+    while (*argv) {
+      c = findcmd(cmds, *argv);
+      fprintf(fp, "Usage: %s [-OPTIONS] %s\n", QUIS, c->usage);
+      if (c->help) {
+       fputc('\n', fp);        
+       pquis(fp, c->help);
+      }
+      argv++;
+      if (*argv) fputc('\n', fp);
+    }
+  }
+}
+
+/*----- That's all, folks -------------------------------------------------*/