git.distorted.org.uk Git - u/mdw/catacomb/blob - cc-subcmd.c

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Subcommand infrastructure
   6  *
   7  * (c) 2004 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Header files ------------------------------------------------------*/
  31
  32 #include <mLib/quis.h>
  33 #include <mLib/report.h>
  34
  35 #include "cc.h"
  36
  37 /*----- Main code ---------------------------------------------------------*/
  38
  39 /* --- @findcmd@ --- *
  40  *
  41  * Arguments:   @const cmd *cmds@ = pointer to command table
  42  *              @const char *name@ = a command name
  43  *
  44  * Returns:     Pointer to the command structure.
  45  *
  46  * Use:         Looks up a command by name.  If the command isn't found, an
  47  *              error is reported and the program is terminated.
  48  */
  49
  50 const cmd *findcmd(const cmd *cmds, const char *name)
  51 {
  52   const cmd *c, *chosen = 0;
  53   size_t sz = strlen(name);
  54
  55   for (c = cmds; c->name; c++) {
  56     if (strncmp(name, c->name, sz) == 0) {
  57       if (c->name[sz] == 0) {
  58         chosen = c;
  59         break;
  60       } else if (chosen)
  61         die(EXIT_FAILURE, "ambiguous command name `%s'", name);
  62       else
  63         chosen = c;
  64     }
  65   }
  66   if (!chosen)
  67     die(EXIT_FAILURE, "unknown command name `%s'", name);
  68   return (chosen);
  69 }
  70
  71 /* --- @sc_help@ --- *
  72  *
  73  * Arguments:   @const cmd *cmds@ = pointer to command table
  74  *              @FILE *fp@ = output file handle
  75  *              @char *const *argv@ = remaining arguments
  76  *
  77  * Returns:     ---
  78  *
  79  * Use:         Prints a help message, maybe with help about subcommands.
  80  */
  81
  82 void sc_help(const cmd *cmds, FILE *fp, char *const *argv)
  83 {
  84   const cmd *c;
  85
  86   version(fp);
  87   fputc('\n', fp);
  88   if (!*argv) {
  89     help_global(fp);
  90     fputs("\n\
  91 The following commands are understood:\n\n",
  92           fp);
  93     for (c = cmds; c->name; c++)
  94       fprintf(fp, "%s\n", c->usage);
  95   } else {
  96     while (*argv) {
  97       c = findcmd(cmds, *argv);
  98       fprintf(fp, "Usage: %s [-OPTIONS] %s\n", QUIS, c->usage);
  99       if (c->help) {
 100         fputc('\n', fp);
 101         pquis(fp, c->help);
 102       }
 103       argv++;
 104       if (*argv) fputc('\n', fp);
 105     }
 106   }
 107 }
 108
 109 /*----- That's all, folks -------------------------------------------------*/