release/src-rt/wl/nas/unix.c

   1 /*
   2  * Unix support routines
   3  *
   4  * Copyright (C) 2010, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Broadcom Corporation;
   8  * the contents of this file may not be disclosed to third parties, copied
   9  * or duplicated in any form, in whole or in part, without the prior
  10  * written permission of Broadcom Corporation.
  11  *
  12  * $Id: unix.c 241388 2011-02-18 03:33:22Z stakita $
  13  */
  14
  15 #include <typedefs.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18
  19 void initopt(void);
  20 int getopt(int argc, char **argv, char *ostr);
  21
  22 /* ****************************************** */
  23 /* Some support functionality to match unix */
  24
  25 /* get option letter from argument vector  */
  26 int opterr = 1;
  27 int optind = 1;
  28 int optopt;                     /* character checked for validity */
  29 char *optarg;                /* argument associated with option */
  30
  31 #define EMSG    ""
  32 #define BADCH ('?')
  33
  34 static char *place = EMSG;        /* option letter processing */
  35
  36 void initopt(void)
  37 {
  38         opterr = 1;
  39         optind = 1;
  40         place = EMSG;        /* option letter processing */
  41 }
  42
  43 int getopt(int argc, char **argv, char *ostr)
  44 {
  45         register char *oli;                        /* option letter list index */
  46
  47         if (!*place) {
  48                 /* update scanning pointer */
  49                 if (optind >= argc || *(place = argv[optind]) != '-' || !*++place) {
  50                         return EOF;
  51                 }
  52                 if (*place == '-') {
  53                         /* found "--" */
  54                         ++optind;
  55                         return EOF;
  56                 }
  57         }
  58
  59         /* option letter okay? */
  60         if ((optopt = (int)*place++) == (int)':' ||
  61             !(oli = strchr(ostr, optopt))) {
  62                 if (!*place) {
  63                         ++optind;
  64                 }
  65                 printf("illegal option");
  66                 return BADCH;
  67         }
  68         if (*++oli != ':') {
  69                 /* don't need argument */
  70                 optarg = NULL;
  71                 if (!*place)
  72                         ++optind;
  73         } else {
  74                 /* need an argument */
  75                 if (*place) {
  76                         optarg = place;                /* no white space */
  77                 } else  if (argc <= ++optind) {
  78                         /* no arg */
  79                         place = EMSG;
  80                         printf("option requires an argument");
  81                         return BADCH;
  82                 } else {
  83                         optarg = argv[optind];                /* white space */
  84                 }
  85                 place = EMSG;
  86                 ++optind;
  87         }
  88         return optopt; /* return option letter */
  89 }