1#include <stdlib.h>
2#include <string.h>
3#include "libbb.h"
4
5/*
6 * Gets the next package field from package_buffer, seperated into the field name
7 * and field value, it returns the int offset to the first character of the next field
8 */
9int read_package_field(const char *package_buffer, char **field_name, char **field_value)
10{
11	int offset_name_start = 0;
12	int offset_name_end = 0;
13	int offset_value_start = 0;
14	int offset_value_end = 0;
15	int offset = 0;
16	int next_offset;
17	int name_length;
18	int value_length;
19	int exit_flag = FALSE;
20
21	if (package_buffer == NULL) {
22		*field_name = NULL;
23		*field_value = NULL;
24		return(-1);
25	}
26	while (1) {
27		next_offset = offset + 1;
28		switch (package_buffer[offset]) {
29			case('\0'):
30				exit_flag = TRUE;
31				break;
32			case(':'):
33				if (offset_name_end == 0) {
34					offset_name_end = offset;
35					offset_value_start = next_offset;
36				}
37				/* TODO: Name might still have trailing spaces if ':' isnt
38				 * immediately after name */
39				break;
40			case('\n'):
41				/* TODO: The char next_offset may be out of bounds */
42				if (package_buffer[next_offset] != ' ') {
43					exit_flag = TRUE;
44					break;
45				}
46			case('\t'):
47			case(' '):
48				/* increment the value start point if its a just filler */
49				if (offset_name_start == offset) {
50					offset_name_start++;
51				}
52				if (offset_value_start == offset) {
53					offset_value_start++;
54				}
55				break;
56		}
57		if (exit_flag == TRUE) {
58			/* Check that the names are valid */
59			offset_value_end = offset;
60			name_length = offset_name_end - offset_name_start;
61			value_length = offset_value_end - offset_value_start;
62			if (name_length == 0) {
63				break;
64			}
65			if ((name_length > 0) && (value_length > 0)) {
66				break;
67			}
68
69			/* If not valid, start fresh with next field */
70			exit_flag = FALSE;
71			offset_name_start = offset + 1;
72			offset_name_end = 0;
73			offset_value_start = offset + 1;
74			offset_value_end = offset + 1;
75			offset++;
76		}
77		offset++;
78	}
79	if (name_length == 0) {
80		*field_name = NULL;
81	} else {
82		*field_name = xstrndup(&package_buffer[offset_name_start], name_length);
83	}
84	if (value_length > 0) {
85		*field_value = xstrndup(&package_buffer[offset_value_start], value_length);
86	} else {
87		*field_value = NULL;
88	}
89	return(next_offset);
90}
91
92