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annotate regex/main.cc @ 40:c25b75f764a7

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add Regex.h
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Mon, 02 Mar 2015 22:18:37 +0900
parents 120c8116e831
children e1c5ecbf8836
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <math.h>
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5 #include <string.h>
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6 #include <sys/mman.h>
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7 #include <sys/stat.h>
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8 #include <sys/types.h>
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9 #include <fcntl.h>
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10 #include "Regex.h"
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11
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12 const char *usr_help_str = "Usage: ./regex [-file filename] [-sw SearchWord]\n";
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13
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14 //Boyer Moore法に使用するテーブルを作成
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15 int *
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16 createBMskiptable(BMDataPtr bmdata)
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17 {
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18 int searchWordLen = bmdata->searchWordLen;
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19 char *searchWord = bmdata->searchWord;
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20 int* skipTable = (int*)malloc(sizeof(int)*256);
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21
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22 for(int i = 0; i < 256; ++i){
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23 bmdata->skipTable[i] = searchWordLen;
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24 }
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25
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26 for(int j = 0; j < searchWordLen - 1; ++j){
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27 bmdata->skipTable[(u_char)searchWord[j]] = searchWordLen - j - 1;
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28 }
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29 return skipTable;
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30 }
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31
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32 //Boyer Moore法による文字列検索アルゴリズム
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33 static void* BMmethod(BMDataPtr bmdata,ResultPtr result)
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34 {
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35 int i = bmdata->searchWordLen - 1;
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36 int matchCounter = 0;
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37
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38 while ( i < bmdata->readTextLen){
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39 int j = bmdata->searchWordLen - 1;
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40 while (bmdata->readText[i] == bmdata->searchWord[j]){
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41 if (j == 0){
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42 matchCounter++;
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43 }
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44 --i;
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45 --j;
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46 }
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47 i = i + fmax(bmdata->skipTable[(u_char)bmdata->readText[i]],bmdata->searchWordLen - j);
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48 }
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49
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50 result->matchNum = matchCounter;
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51 return result;
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52 }
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53
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54 int main(int argc, char* argv[]) {
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55
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56 char *filename = 0;
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57 char *searchWord = 0;
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58
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59 // check argument
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60 for (int i = 0; argv[i]; i++) {
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61 if (strcmp(argv[i], "-file") == 0) {
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62 filename = (char*)argv[i+1]; i++;
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63 }else if (strcmp(argv[i], "-sw") == 0) {
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64 searchWord = (char*)argv[i+1]; i++;
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65 }
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66 }
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68 // prepare file read
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69 if (filename == 0) {
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70 puts(usr_help_str);
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71 exit(1);
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72 }
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73
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74 struct stat sb;
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75 long fd = 0;
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76 char *textfile;
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77
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78 if ((fd=open(filename,O_RDONLY,0666))==0) {
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79 fprintf(stderr,"can't open %s\n",filename);
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80 }
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81
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82 if (fstat(fd,&sb)) {
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83 fprintf(stderr,"can't fstat %s\n",filename);
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84 }
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85
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86 BMDataPtr bmdata = (BMDataPtr)malloc(sizeof(BMData));
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87
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88 textfile = (char*)malloc(sb.st_size);
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89 read(fd,textfile,sb.st_size);
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90
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91 bmdata->readText = textfile;
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92 bmdata->readTextLen = sb.st_size;
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93 bmdata->skipTable = (int*)malloc(sizeof(int)*256);
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94
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95 if (textfile == (char*)-1) {
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96 fprintf(stderr,"Can't mmap file\n");
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97 perror(NULL);
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98 exit(0);
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99 }
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100
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101 // prepare Boyer Moore Search
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102 bmdata->searchWord = searchWord;
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103 bmdata->searchWordLen = strlen((const char*)bmdata->searchWord);
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104 bmdata->skipTable = createBMskiptable(bmdata);
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105
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106 ResultPtr result = (ResultPtr)malloc(sizeof(Result));
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107
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108 BMmethod(bmdata,result);
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109
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110 printf("sword: %s len: %d\n",bmdata->searchWord,bmdata->searchWordLen);
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111 printf("Match : %d\n",result->matchNum);
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112
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113 free(result);
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114 free(bmdata);
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115 return 0;
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116 }