src/options.c

   1 /*
   2  * Copyright (C) 1995-2007, Index Data ApS
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: options.c,v 1.5 2007-01-03 08:42:15 adam Exp $
   6  */
   7 /**
   8  * \file options.c
   9  * \brief Implements command line options parsing
  10  */
  11 #if HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #include <stdlib.h>
  16
  17 #include <yaz/options.h>
  18
  19 static int arg_no = 1;
  20 static int arg_off = 0;
  21
  22 int options (const char *desc, char **argv, int argc, char **arg)
  23 {
  24     int ch, i = 0;
  25
  26     if (arg_no >= argc)
  27         return -2;
  28     if (arg_off == 0)
  29     {
  30         while (argv[arg_no][0] == '\0')
  31         {
  32             arg_no++;
  33             if (arg_no >= argc)
  34                 return -2;
  35         }
  36         if (argv[arg_no][0] != '-' || argv[arg_no][1] == '\0')
  37         {
  38             *arg = argv[arg_no++];
  39             return 0;
  40         }
  41         arg_off++;
  42     }
  43     ch = argv[arg_no][arg_off++];
  44     while (desc[i])
  45     {
  46         int desc_char = desc[i++];
  47         int type = 0;
  48         if (desc[i] == ':')
  49         {       /* string argument */
  50             type = desc[i++];
  51         }
  52         if (desc_char == ch)
  53         { /* option with argument */
  54             if (type)
  55             {
  56                 if (argv[arg_no][arg_off])
  57                 {
  58                     *arg = argv[arg_no]+arg_off;
  59                     arg_no++;
  60                     arg_off =  0;
  61                 }
  62                 else
  63                 {
  64                     arg_no++;
  65                     arg_off = 0;
  66                     if (arg_no < argc)
  67                         *arg = argv[arg_no++];
  68                     else
  69                         *arg = "";
  70                 }
  71             }
  72             else /* option with no argument */
  73             {
  74                 if (argv[arg_no][arg_off])
  75                     arg_off++;
  76                 else
  77                 {
  78                     arg_off = 0;
  79                     arg_no++;
  80                 }
  81             }
  82             return ch;
  83         }
  84     }
  85     *arg = argv[arg_no]+arg_off-1;
  86     arg_no = arg_no + 1;
  87     arg_off = 0;
  88     return -1;
  89 }
  90 /*
  91  * Local variables:
  92  * c-basic-offset: 4
  93  * indent-tabs-mode: nil
  94  * End:
  95  * vim: shiftwidth=4 tabstop=8 expandtab
  96  */
  97