/*
?*?Copyright?（C）?2010?The?Android?Open?Source?Project
?*
?*?Licensed?under?the?Apache?License?Version?2.0?（the?“License“）;
?*?you?may?not?use?this?file?except?in?compliance?with?the?License.
?*?You?may?obtain?a?copy?of?the?License?at
?*
?*??????http://www.apache.org/licenses/LICENSE-2.0
?*
?*?Unless?required?by?applicable?law?or?agreed?to?in?writing?software
?*?distributed?under?the?License?is?distributed?on?an?“AS?IS“?BASIS
?*?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND?either?express?or?implied.
?*?See?the?License?for?the?specific?language?governing?permissions?and
?*?limitations?under?the?License.
?*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include??
#include??
#include??
#include??
#include??
#include?
#include?
#include?
#include?
#include?
#include?

#define??LOG_TAG??“GPS“
#define??GPS_DEBUG??0
#if?GPS_DEBUG
#define??D（...）???LOGD（__VA_ARGS__）
#else
#define??D（...）???（（void）0）
#endif

typedef?struct?{
????const?char*??p;
????const?char*??end;
}?Token;

#define??MAX_NMEA_TOKENS??21
typedef?struct?{
????int?????count;
????Token???tokens[?MAX_NMEA_TOKENS?];
}?NmeaTokenizer;

GpsStatus?g_status;

static?int
nmea_tokenizer_init（?NmeaTokenizer*??t?const?char*??p?const?char*??end?）
{
????int????count?=?0;
????char*??q;

????//?the?initial?‘$‘?is?optional
????if?（p?????????p?+=?1;
????//?remove?trailing?newline
????if?（end?>?p?&&?end[-1]?==?‘\n‘）?{
????????end?-=?1;
????????if?（end?>?p?&&?end[-1]?==?‘\r‘）
????????????end?-=?1;
????}
????//?get?rid?of?checksum?at?the?end?of?the?sentecne
????if?（end?>=?p+3?&&?end[-3]?==?‘*‘）?{
????????end?-=?3;
????}

????while?（p?????????const?char*??q?=?p;
????????q?=?memchr（p?‘‘?end-p）;
????????if?（q?==?NULL）{
????????????q?=?end;
		}
????????if?（q?>=?p）?{
????????????if?（count?????????????????t->tokens[count].p???=?p;
????????????????t->tokens[count].end?=?q;
????????????????count?+=?1;
????????????}
????????}
????????if?（q?????????????q?+=?1;
		}
????????p?=?q;
????}

????t->count?=?count;
????return?count;
}

static?Token
nmea_tokenizer_get（?NmeaTokenizer*??t?int??index?）
{
????Token??tok;
????static?const?char*??dummy?=?““;

????if?（index?=?t->count）?{
????????tok.p?=?tok.end?=?dummy;
????}?else?{
????????tok?=?t->tokens[index];
????}
????return?tok;
}

static?int
str2int（?const?char*??p?const?char*??end?）
{
????int???result?=?0;
????int???len????=?end?-?p;

????for?（?;?len?>?0;?len--?p++?）
????{
????????int??c;
????????if?（p?>=?end）
????????????goto?Fail;

????????c?=?*p?-?‘0‘;
????????if?（（unsigned）c?>=?10）
????????????goto?Fail;

????????result?=?result*10?+?c;
????}
????return??result;

Fail:
????return?-1;
}

static?double
str2float（?const?char*??p?const?char*??end?）
{

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????13652??2014-03-12?15:54??gps_hal\gps.default.so

?????文件??????30735??2014-03-12?15:54??gps_hal\gps.c

?????文件???????1045??2014-03-12?09:53??gps_hal\Android.mk

?????目錄??????????0??2014-03-12?15:54??gps_hal

-----------?---------??----------?-----??----

????????????????45432????????????????????4