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annotate regexParser/fileread.cc @ 232:1a34e702776a

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add fileread.cc
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Tue, 19 Jan 2016 13:16:35 +0900
parents
children 6d0a0126ddda
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232
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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1 #include <stdio.h>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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2 #include <string.h>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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3 #include <unistd.h>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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4 #include <fcntl.h>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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5 #include <sys/stat.h>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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6 #include <sys/mman.h>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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7
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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8 #include "sequentialSearch.h"
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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9 #include "fileread.h"
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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10
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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11 st_mmap_t createSt_mmap(char* filename,int fd) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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12 st_mmap_t st_mmap;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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13 int map = MAP_PRIVATE;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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14 struct stat sb;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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15 if ((fd=open(filename,O_RDONLY,0666))==0) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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16 perror("");
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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17 fprintf(stderr,"can't open %s\n",filename);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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18 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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19
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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20 if (fstat(fd,&sb)) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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21 perror("");
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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22 fprintf(stderr,"can't fstat %s\n",filename);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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23 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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24 st_mmap.size = sb.st_size;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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25 unsigned char *file_mmap = (unsigned char*)mmap(NULL,st_mmap.size,PROT_WRITE|PROT_READ,map,fd,(off_t)0);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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26 if (file_mmap == NULL) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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27 perror("");
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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28 fprintf(stderr,"cannot mmap %s\n",filename);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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29 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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30 st_mmap.file_mmap = file_mmap;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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31 return st_mmap;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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32 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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33
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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34 Buffer createBuffer(st_mmap_t st_mmap) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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35 Buffer buff;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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36 buff.buff = buff.buffptr = buff.matchBegin = st_mmap.file_mmap;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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37 buff.buffend = buff.buff + st_mmap.size;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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38 return buff;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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39 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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40