dirname.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
  18 #define VERSION "0.01"
  19
  20 int main(int argc, char* argv[])
  21 {
  22     if (argc < 2) {
  23         printf("%s: missing operand\n"
  24                "Run '%s --help' for usage.\n",
  25                argv[0], argv[0]);
  26         return 1;
  27     }
  28
  29     char sep = '\n';
  30
  31     // flag parsing
  32     int arg = 0;
  33     for (arg = 1; arg < argc; arg++)
  34     {
  35         if (strcmp(argv[arg], "-z") == 0 || strcmp(argv[arg], "--zero") == 0) {
  36             sep = '\0';
  37         } else if (strcmp(argv[arg], "-h") == 0 || strcmp(argv[arg], "--help") == 0) {
  38             printf("Usage: %s [options ...] [name ...]\n", argv[0]);
  39             printf("Output each [name] with its last non-slash component and trailing slashes removed.\n"
  40                    "If [name] contains no /'s, then output is '.' (meaning the current directory)."
  41                    "\n"
  42                    "    -z, --zero              Separate output with NUL rather than newline.\n"
  43                    "\n"
  44                    "    -h, --help              Print this message.\n"
  45                    "    -v, --version           Show version info.\n");
  46             return 0;
  47         } else if (strcmp(argv[arg], "-v") == 0 || strcmp(argv[arg], "--version") == 0) {
  48             printf("dirname (mutos) v"VERSION"\n");
  49             return 0;
  50         } else {
  51             // no more flags
  52             break;
  53         }
  54     }
  55
  56     for ( ; arg < argc; arg++)
  57     {
  58         int last_slash = -1;
  59         for (size_t i = 0; i < strlen(argv[arg]); i++)
  60         {
  61             if (argv[arg][i] == '/' && i != strlen(argv[arg]) - 1) {
  62                 last_slash = i;
  63             }
  64         }
  65         if (last_slash == -1) {
  66             argv[arg] = ".";
  67         } else {
  68             argv[arg][last_slash] = '\0';
  69         }
  70         printf("%s%c", argv[arg], sep);
  71     }
  72 }