lib/getargs.c

   1 /*
   2  * lib/getargs.c      General argument parser.
   3  *
   4  * Version:     $Id: getargs.c,v 1.3 1998/11/15 20:09:43 freitag Exp $
   5  *
   6  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
   7  *              Copyright 1993,1994 MicroWalt Corporation
   8  *
   9  *              This program is free software; you can redistribute it
  10  *              and/or  modify it under  the terms of  the GNU General
  11  *              Public  License as  published  by  the  Free  Software
  12  *              Foundation;  either  version 2 of the License, or  (at
  13  *              your option) any later version.
  14  */
  15 #include "config.h"
  16 #include <sys/types.h>
  17 #include <sys/socket.h>
  18 #include <net/if.h>
  19 #include <errno.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include "net-support.h"
  26 #include "pathnames.h"
  27
  28
  29 /* Split the input string into multiple fields. */
  30 int getargs(char *string, char *arguments[])
  31 {
  32     int len = strlen(string);
  33     char temp[len+1];
  34     char *sp, *ptr;
  35     int i, argc;
  36     char want;
  37
  38     /*
  39      * Copy the string into a buffer.  We may have to modify
  40      * the original string because of all the quoting...
  41      */
  42     sp = string;
  43     i = 0;
  44     strcpy(temp, string);
  45     ptr = temp;
  46
  47     /*
  48      * Look for delimiters ("); if present whatever
  49      * they enclose will be considered one argument.
  50      */
  51     while (*ptr != '\0' && i < 31) {
  52         /* Ignore leading whitespace on input string. */
  53         while (*ptr == ' ' || *ptr == '\t')
  54             ptr++;
  55
  56         /* Set string pointer. */
  57         arguments[i++] = sp;
  58
  59         /* Check for any delimiters. */
  60         if (*ptr == '"' || *ptr == '\'') {
  61             /*
  62              * Copy the string up to any whitespace OR the next
  63              * delimiter. If the delimiter was escaped, skip it
  64              * as it if was not there.
  65              */
  66             want = *ptr++;
  67             while (*ptr != '\0') {
  68                 if (*ptr == want && *(ptr - 1) != '\\') {
  69                     ptr++;
  70                     break;
  71                 }
  72                 *sp++ = *ptr++;
  73             }
  74         } else {
  75             /* Just copy the string up to any whitespace. */
  76             while (*ptr != '\0' && *ptr != ' ' && *ptr != '\t')
  77                 *sp++ = *ptr++;
  78         }
  79         *sp++ = '\0';
  80
  81         /* Skip trailing whitespace. */
  82         if (*ptr != '\0') {
  83             while (*ptr == ' ' || *ptr == '\t')
  84                 ptr++;
  85         }
  86     }
  87     argc = i;
  88     while (i < 32)
  89         arguments[i++] = (char *) NULL;
  90     return (argc);
  91 }