1/******************************************************************************
2 *   Copyright (C) 2009, International Business Machines
3 *   Corporation and others.  All Rights Reserved.
4 *******************************************************************************
5 */
6
7#include "flagparser.h"
8#include "filestrm.h"
9
10#define LARGE_BUFFER_MAX_SIZE 2048
11
12static void extractFlag(char* buffer, int32_t bufferSize, char* flag);
13static int32_t getFlagOffset(const char *buffer, int32_t bufferSize);
14
15/*
16 * Opens the given fileName and reads in the information storing the data in flagBuffer.
17 */
18U_CAPI void U_EXPORT2
19parseFlagsFile(const char *fileName, char **flagBuffer, int32_t flagBufferSize, int32_t numOfFlags, UErrorCode *status) {
20    char buffer[LARGE_BUFFER_MAX_SIZE];
21    int32_t i;
22
23    FileStream *f = T_FileStream_open(fileName, "r");
24    if (f == NULL) {
25        *status = U_FILE_ACCESS_ERROR;
26    }
27
28    for (i = 0; i < numOfFlags; i++) {
29        if (T_FileStream_readLine(f, buffer, LARGE_BUFFER_MAX_SIZE) == NULL) {
30            *status = U_FILE_ACCESS_ERROR;
31            break;
32        }
33
34        extractFlag(buffer, LARGE_BUFFER_MAX_SIZE, flagBuffer[i]);
35    }
36
37    T_FileStream_close(f);
38}
39
40
41/*
42 * Extract the setting after the '=' and store it in flag excluding the newline character.
43 */
44static void extractFlag(char* buffer, int32_t bufferSize, char* flag) {
45    int32_t i;
46    char *pBuffer;
47    int32_t offset;
48    UBool bufferWritten = FALSE;
49
50    if (buffer[0] != 0) {
51        /* Get the offset (i.e. position after the '=') */
52        offset = getFlagOffset(buffer, bufferSize);
53        pBuffer = buffer+offset;
54        for(i = 0;;i++) {
55            if (pBuffer[i+1] == 0) {
56                /* Indicates a new line character. End here. */
57                flag[i] = 0;
58                break;
59            }
60
61            flag[i] = pBuffer[i];
62            if (i == 0) {
63                bufferWritten = TRUE;
64            }
65        }
66    }
67
68    if (!bufferWritten) {
69        flag[0] = 0;
70    }
71}
72
73/*
74 * Get the position after the '=' character.
75 */
76static int32_t getFlagOffset(const char *buffer, int32_t bufferSize) {
77    int32_t offset = 0;
78
79    for (offset = 0; offset < bufferSize;offset++) {
80        if (buffer[offset] == '=') {
81            offset++;
82            break;
83        }
84    }
85
86    if (offset == bufferSize || (offset - 1) == bufferSize) {
87        offset = 0;
88    }
89
90    return offset;
91}
92