1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) many different people.
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6 | * If you wrote this, please acknowledge your work.
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7 | *
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8 | * This program is free software; you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation; either version 2 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful, but
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 | * General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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21 | * USA
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22 | */
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23 |
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24 | #include <stdlib.h>
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25 | #include <string.h>
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26 | #include "libbb.h"
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27 |
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28 | /*
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29 | * Gets the next package field from package_buffer, seperated into the field name
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30 | * and field value, it returns the int offset to the first character of the next field
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31 | */
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32 | int read_package_field(const char *package_buffer, char **field_name, char **field_value)
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33 | {
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34 | int offset_name_start = 0;
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35 | int offset_name_end = 0;
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36 | int offset_value_start = 0;
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37 | int offset_value_end = 0;
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38 | int offset = 0;
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39 | int next_offset;
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40 | int name_length;
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41 | int value_length;
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42 | int exit_flag = FALSE;
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43 |
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44 | if (package_buffer == NULL) {
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45 | *field_name = NULL;
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46 | *field_value = NULL;
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47 | return(-1);
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48 | }
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49 | while (1) {
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50 | next_offset = offset + 1;
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51 | switch (package_buffer[offset]) {
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52 | case('\0'):
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53 | exit_flag = TRUE;
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54 | break;
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55 | case(':'):
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56 | if (offset_name_end == 0) {
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57 | offset_name_end = offset;
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58 | offset_value_start = next_offset;
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59 | }
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60 | /* TODO: Name might still have trailing spaces if ':' isnt
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61 | * immediately after name */
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62 | break;
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63 | case('\n'):
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64 | /* TODO: The char next_offset may be out of bounds */
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65 | if (package_buffer[next_offset] != ' ') {
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66 | exit_flag = TRUE;
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67 | break;
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68 | }
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69 | case('\t'):
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70 | case(' '):
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71 | /* increment the value start point if its a just filler */
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72 | if (offset_name_start == offset) {
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73 | offset_name_start++;
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74 | }
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75 | if (offset_value_start == offset) {
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76 | offset_value_start++;
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77 | }
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78 | break;
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79 | }
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80 | if (exit_flag) {
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81 | /* Check that the names are valid */
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82 | offset_value_end = offset;
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83 | name_length = offset_name_end - offset_name_start;
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84 | value_length = offset_value_end - offset_value_start;
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85 | if (name_length == 0) {
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86 | break;
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87 | }
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88 | if ((name_length > 0) && (value_length > 0)) {
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89 | break;
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90 | }
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91 |
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92 | /* If not valid, start fresh with next field */
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93 | exit_flag = FALSE;
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94 | offset_name_start = offset + 1;
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95 | offset_name_end = 0;
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96 | offset_value_start = offset + 1;
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97 | offset_value_end = offset + 1;
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98 | offset++;
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99 | }
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100 | offset++;
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101 | }
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102 | if (name_length == 0) {
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103 | *field_name = NULL;
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104 | } else {
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105 | *field_name = bb_xstrndup(&package_buffer[offset_name_start], name_length);
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106 | }
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107 | if (value_length > 0) {
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108 | *field_value = bb_xstrndup(&package_buffer[offset_value_start], value_length);
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109 | } else {
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110 | *field_value = NULL;
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111 | }
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112 | return(next_offset);
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113 | }
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114 |
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