usr/src/lib/libshare/common/parser.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  * Copyright 2012 Milan Jurik. All rights reserved.
  26  */
  27
  28 #include <stdio.h>
  29 #include <ctype.h>
  30
  31 #define TK_INIT         0
  32 #define TK_TOKEN        1
  33 #define TK_SKIPWHITE    2
  34 #define TK_QUOTED       3
  35
  36 /*
  37  * assumes quoted strings are delimited by white space (i.e sp
  38  * "string" sp). Backslash can be used to quote a quote mark.
  39  * quoted strings will have the quotes stripped.
  40  */
  41
  42 char *
  43 _sa_get_token(char *string)
  44 {
  45         static char *orig = NULL;
  46         static char *curp;
  47         char *ret;
  48         int state = TK_INIT;
  49         int c;
  50         int quotechar;
  51
  52         if (string != orig || string == NULL) {
  53                 orig = string;
  54                 curp = string;
  55                 if (string == NULL) {
  56                         return (NULL);
  57                 }
  58         }
  59         ret = curp;
  60         while ((c = *curp) != '\0') {
  61                 switch (state) {
  62                 case TK_SKIPWHITE:
  63                 case TK_INIT:
  64                         if (isspace(c)) {
  65                                 while (*curp && isspace(*curp))
  66                                         curp++;
  67                                 ret = curp;
  68                         }
  69                         if (c == '"' || c == '\'') {
  70                                 state = TK_QUOTED;
  71                                 curp++;
  72                                 ret = curp;
  73                                 quotechar = c; /* want to match for close */
  74                         } else {
  75                                 state = TK_TOKEN;
  76                         }
  77                         break;
  78                 case TK_TOKEN:
  79                         switch (c) {
  80                         case '\\':
  81                                 curp++;
  82                                 if (*curp) {
  83                                         curp++;
  84                                         break;
  85                                 }
  86                                 return (ret);
  87                         default:
  88                                 if (*curp == '\0' || isspace(c)) {
  89                                         *curp++ = '\0';
  90                                         return (ret);
  91                                 }
  92                                 curp++;
  93                                 break;
  94                         }
  95                         break;
  96                 case TK_QUOTED:
  97                         switch (c) {
  98                         case '\\':
  99                                 curp++;
 100                                 if (*curp) {
 101                                         curp++;
 102                                         break;
 103                                 }
 104                                 curp++;
 105                                 break;
 106                         default:
 107                                 if (c == '\0' || c == quotechar) {
 108                                         *curp++ = '\0';
 109                                         return (ret);
 110                                 }
 111                                 curp++;
 112                                 break;
 113                         }
 114                         break;
 115                 }
 116         }
 117         return (NULL);
 118 }