echo.c

   1 /*
   2     Copyright © 2013 Alastair Stuart
   3
   4     This program is open source software: you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation, either version 3 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12     GNU General Public License for more details.
  13 */
  14
  15 #include <stdio.h>
  16 #include <string.h>
  17 #include <stdbool.h>
  18
  19 #define VERSION "0.01"
  20
  21 struct {
  22     bool newline;
  23 } flags;
  24
  25 int main(int argc, char* argv[])
  26 {
  27     flags.newline = false;
  28
  29     // flag parsing
  30     int arg = 0;
  31     for (arg = 1; arg < argc; arg++)
  32     {
  33         if (strcmp("-n", argv[arg]) == 0) {
  34             flags.newline = true;
  35         } else if (strcmp("--help", argv[arg]) == 0 || strcmp("-h", argv[arg]) == 0) {
  36             printf("Usage: %s [options] [string ...]\n", argv[0]);
  37             printf("\n"
  38                    "    -n                  Don't print the trailing newline.\n"
  39                    "\n"
  40                    "    --help              Print this message.\n"
  41                    "    --version           Show version info.\n");
  42             return 0;
  43         } else if (strcmp("--version", argv[arg]) == 0 || strcmp("-v", argv[arg]) == 0) {
  44             printf("echo (mutos) v"VERSION"\n");
  45             return 0;
  46         } else if (strcmp("--", argv[arg]) == 0) {
  47             arg++;
  48             break;
  49         } else {
  50             // no more flags
  51             break;
  52         }
  53     }
  54
  55     for ( ; arg < argc; arg++)
  56     {
  57         printf("%s%s", argv[arg], arg != argc - 1 ? " " : (flags.newline ? "" : "\n"));
  58     }
  59
  60     return 0;
  61 }