[821] | 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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