source: MondoRescue/branches/stable/mindi-busybox/libbb/read_package_field.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.0 KB
RevLine 
[821]1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) many different people.
6 * If you wrote this, please acknowledge your work.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 */
23
24#include <stdlib.h>
25#include <string.h>
26#include "libbb.h"
27
28/*
29 * Gets the next package field from package_buffer, seperated into the field name
30 * and field value, it returns the int offset to the first character of the next field
31 */
32int read_package_field(const char *package_buffer, char **field_name, char **field_value)
33{
34    int offset_name_start = 0;
35    int offset_name_end = 0;
36    int offset_value_start = 0;
37    int offset_value_end = 0;
38    int offset = 0;
39    int next_offset;
40    int name_length;
41    int value_length;
42    int exit_flag = FALSE;
43
44    if (package_buffer == NULL) {
45        *field_name = NULL;
46        *field_value = NULL;
47        return(-1);
48    }
49    while (1) {
50        next_offset = offset + 1;
51        switch (package_buffer[offset]) {
52            case('\0'):
53                exit_flag = TRUE;
54                break;
55            case(':'):
56                if (offset_name_end == 0) {
57                    offset_name_end = offset;
58                    offset_value_start = next_offset;
59                }
60                /* TODO: Name might still have trailing spaces if ':' isnt
61                 * immediately after name */
62                break;
63            case('\n'):
64                /* TODO: The char next_offset may be out of bounds */
65                if (package_buffer[next_offset] != ' ') {
66                    exit_flag = TRUE;
67                    break;
68                }
69            case('\t'):
70            case(' '):
71                /* increment the value start point if its a just filler */
72                if (offset_name_start == offset) {
73                    offset_name_start++;
74                }
75                if (offset_value_start == offset) {
76                    offset_value_start++;
77                }
78                break;
79        }
80        if (exit_flag) {
81            /* Check that the names are valid */
82            offset_value_end = offset;
83            name_length = offset_name_end - offset_name_start;
84            value_length = offset_value_end - offset_value_start;
85            if (name_length == 0) {
86                break;
87            }
88            if ((name_length > 0) && (value_length > 0)) {
89                break;
90            }
91
92            /* If not valid, start fresh with next field */
93            exit_flag = FALSE;
94            offset_name_start = offset + 1;
95            offset_name_end = 0;
96            offset_value_start = offset + 1;
97            offset_value_end = offset + 1;
98            offset++;
99        }
100        offset++;
101    }
102    if (name_length == 0) {
103        *field_name = NULL;
104    } else {
105        *field_name = bb_xstrndup(&package_buffer[offset_name_start], name_length);
106    }
107    if (value_length > 0) {
108        *field_value = bb_xstrndup(&package_buffer[offset_value_start], value_length);
109    } else {
110        *field_value = NULL;
111    }
112    return(next_offset);
113}
114
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