| 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 | #define _FILE_OFFSET_BITS 64 |
| 33 | |
| 34 | #include <mLib/quis.h> |
| 35 | #include <mLib/report.h> |
| 36 | |
| 37 | #include "cc.h" |
| 38 | |
| 39 | /*----- Main code ---------------------------------------------------------*/ |
| 40 | |
| 41 | /* --- @findcmd@ --- * |
| 42 | * |
| 43 | * Arguments: @const cmd *cmds@ = pointer to command table |
| 44 | * @const char *name@ = a command name |
| 45 | * |
| 46 | * Returns: Pointer to the command structure. |
| 47 | * |
| 48 | * Use: Looks up a command by name. If the command isn't found, an |
| 49 | * error is reported and the program is terminated. |
| 50 | */ |
| 51 | |
| 52 | const cmd *findcmd(const cmd *cmds, const char *name) |
| 53 | { |
| 54 | const cmd *c, *chosen = 0; |
| 55 | size_t sz = strlen(name); |
| 56 | |
| 57 | for (c = cmds; c->name; c++) { |
| 58 | if (strncmp(name, c->name, sz) == 0) { |
| 59 | if (c->name[sz] == 0) { |
| 60 | chosen = c; |
| 61 | break; |
| 62 | } else if (chosen) |
| 63 | die(EXIT_FAILURE, "ambiguous command name `%s'", name); |
| 64 | else |
| 65 | chosen = c; |
| 66 | } |
| 67 | } |
| 68 | if (!chosen) |
| 69 | die(EXIT_FAILURE, "unknown command name `%s'", name); |
| 70 | return (chosen); |
| 71 | } |
| 72 | |
| 73 | /* --- @sc_help@ --- * |
| 74 | * |
| 75 | * Arguments: @const cmd *cmds@ = pointer to command table |
| 76 | * @FILE *fp@ = output file handle |
| 77 | * @char *const *argv@ = remaining arguments |
| 78 | * |
| 79 | * Returns: --- |
| 80 | * |
| 81 | * Use: Prints a help message, maybe with help about subcommands. |
| 82 | */ |
| 83 | |
| 84 | void sc_help(const cmd *cmds, FILE *fp, char *const *argv) |
| 85 | { |
| 86 | const cmd *c; |
| 87 | |
| 88 | version(fp); |
| 89 | fputc('\n', fp); |
| 90 | if (!*argv) { |
| 91 | help_global(fp); |
| 92 | fputs("\n\ |
| 93 | The following commands are understood:\n\n", |
| 94 | fp); |
| 95 | for (c = cmds; c->name; c++) |
| 96 | fprintf(fp, "%s\n", c->usage); |
| 97 | } else { |
| 98 | while (*argv) { |
| 99 | c = findcmd(cmds, *argv); |
| 100 | fprintf(fp, "Usage: %s [-OPTIONS] %s\n", QUIS, c->usage); |
| 101 | if (c->help) { |
| 102 | fputc('\n', fp); |
| 103 | pquis(fp, c->help); |
| 104 | } |
| 105 | argv++; |
| 106 | if (*argv) fputc('\n', fp); |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /*----- That's all, folks -------------------------------------------------*/ |