HomeworkSubstringSearch

substringSearch/substringSearch.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "substringSearch", "substringSearch\substringSearch.vcxproj", "{991473C0-010E-492B-91D1-3EFBDEB6FAB3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Debug|x64.ActiveCfg = Debug|x64
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Debug|x64.Build.0 = Debug|x64
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Debug|x86.ActiveCfg = Debug|Win32
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Debug|x86.Build.0 = Debug|Win32
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Release|x64.ActiveCfg = Release|x64
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Release|x64.Build.0 = Release|x64
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Release|x86.ActiveCfg = Release|Win32
+		{991473C0-010E-492B-91D1-3EFBDEB6FAB3}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7A1CB94E-03B1-4922-AC28-FD130F1083F6}
+	EndGlobalSection
+EndGlobal

substringSearch/substringSearch/KMP.c

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+#include "KMP.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int* prefixFunction(const char* string) {
+	int* prefixArray = calloc(strlen(string), sizeof(int));
+	if (prefixArray == NULL) {
+		return NULL;
+	}
+	prefixArray[0] = 0;
+	size_t sizeString = strlen(string);
+	for (size_t i = 1, j = 0; i < sizeString; ++i) {
+		while (j > 0 && string[j] != string[i]) {
+			j = prefixArray[j - 1];
+		}
+		if (string[i] == string[j]) {
+			++j;
+		}
+		prefixArray[i] = j;
+	}
+	return prefixArray;
+}
+
+int findIndexSubstring(const char* string, const char* substring, int* errorCode) {
+	size_t sizeString = strlen(string);
+	size_t sizeSubstring = strlen(substring);
+	int result = -1;
+	if (sizeString == 0 || sizeSubstring == 0 || sizeString < sizeSubstring) {
+		return -1;
+	}
+	int* prefixArray = prefixFunction(substring);
+	for (int i = 0, j = 0; i < sizeString; ++i) {
+		while (j > 0 && substring[j] != string[i]) {
+			j = prefixArray[j - 1];
+		}
+		if (substring[j] == string[i]) {
+			++j;
+		}
+		if (j == sizeSubstring) {
+			free(prefixArray);
+			return i - j + 1;
+		}
+	}
+	free(prefixArray);
+	return -1;
+}

substringSearch/substringSearch/KMP.h

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+#pragma once
+
+//the KMP algorithm for finding a substring in a string
+int findIndexSubstring(const char* string, const char* substring, int* errorCode);

substringSearch/substringSearch/main.c

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+#include "test.h"
+#include "KMP.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+
+char* getLine(int* lengthString, int* errorCode) {
+	*lengthString = 0;
+	int index = 1;
+	char* string = (char*)malloc(sizeof(char));
+	if (string == NULL) {
+		*errorCode = -1;
+		return NULL;
+	}
+	char symbol = getchar();
+	while (symbol != '\n') {
+		string[*lengthString] = symbol;
+		++(*lengthString);
+		if (*lengthString >= index) {
+			index *= 2;
+			char* copy = (char*)realloc(string, index * sizeof(char));
+			if (copy == NULL) {
+				*errorCode = -1;
+				free(string);
+				return NULL;
+			}
+			string = copy;
+		}
+		symbol = getchar();
+	}
+	if (string == NULL) {
+		*errorCode = -1;
+		return NULL;
+	}
+	string[*lengthString] = '\0';
+
+	return string;
+}
+
+int workWithFile(const char* nameFile, int* errorCode, int sizeSubstring, const char* substring) {
+	FILE* file = NULL;
+	*errorCode = fopen_s(&file, nameFile, "r");
+	if (*errorCode != 0 || file == NULL) {
+		*errorCode = -1;
+		return -1;
+	}
+
+	char buffer[400] = { '\0' };
+	char copyText[200] = { '\0' };
+	int steps = 1;
+	size_t sizeBuffer = 0;
+	size_t sizeCopyText = 0;
+	int index = 0;
+	int indexToReturn = 0;
+	while (fgets(copyText, 200, file) != NULL) {
+		switch (steps)
+		{
+		case 1:
+			index = findIndexSubstring(copyText, substring, errorCode);
+			strcpy(buffer, copyText);
+			steps = 2;
+			break;
+		case 2:
+			sizeBuffer = strlen(buffer);
+			sizeCopyText = strlen(copyText);
+			for (int i = sizeBuffer; i < sizeBuffer + sizeCopyText; ++i) {
+				buffer[i] = copyText[i - 199];
+			}
+			steps = 3;
+			index = findIndexSubstring(buffer, substring, errorCode);
+			break;
+		case 3:
+			indexToReturn += 199;
+			sizeBuffer = strlen(buffer);
+			if (sizeBuffer >= 200) {
+				int difference = sizeBuffer - 199;
+				for (int i = sizeBuffer - 199; i < sizeBuffer; ++i) {
+					buffer[i - difference] = buffer[i];
+				}
+			}
+			sizeCopyText = strlen(copyText);
+			for (int i = 0; i < sizeCopyText; ++i) {
+				buffer[i + 199] = copyText[i];
+			}
+			index = findIndexSubstring(buffer, substring, errorCode);
+			break;
+		}
+		if (index != -1) {
+			fclose(file);
+			return index + indexToReturn;
+		}
+		if (*errorCode != 0) {
+			fclose(file);
+			return -1;
+		}
+		memset(copyText, 0, 200);
+	}
+	fclose(file);
+}
+
+int main() {
+	if (test()) {
+		printf("Test correct!\n");
+	} else {
+		printf("Test not correct!\n");
+	}
+	printf("Input file name with extension\n");
+	int errorCode = 0;
+	int sizeFile = 0;
+	const char* nameFile = getLine(&sizeFile, &errorCode);
+	if (errorCode != 0) {
+		printf("Error\n");
+		return -1;
+	}
+	printf("Input substring. No more than 99 symbols\n");
+	int sizeSubstring = 0;
+	char* substring = getLine(&sizeSubstring, &errorCode);
+	if (errorCode != 0 || substring == NULL) {
+		printf("Error\n");
+		free(nameFile);
+		return -1;
+	}
+	while (sizeSubstring > 100) {
+		printf("No more than 99 symbols");
+		free(substring);
+		substring = getLine(&sizeSubstring, &errorCode);
+		if (errorCode != 0 || substring == NULL) {
+			printf("Error\n");
+			free(nameFile);
+			return -1;
+		}
+	}
+	int number = workWithFile(nameFile, &errorCode, sizeSubstring, substring);
+	if (errorCode != 0) {
+		printf("Error\n");
+		free(nameFile);
+		free(substring);
+		return -1;
+	}
+	free(nameFile);
+	free(substring);
+	if (number != -1) {
+		printf("%d\n", number);
+	} else {
+		printf("No occurrences found\n");
+	}
+}

substringSearch/substringSearch/substringSearch.vcxproj

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+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
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+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
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+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
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+    <ProjectConfiguration Include="Release|x64">
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+      <Platform>x64</Platform>
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+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{991473c0-010e-492b-91d1-3efbdeb6fab3}</ProjectGuid>
+    <RootNamespace>substringSearch</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
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+    <CharacterSet>Unicode</CharacterSet>
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+    <Link>
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+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
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+    <ClCompile Include="main.c" />
+    <ClCompile Include="test.c" />
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+  <ItemGroup>
+    <Text Include="test.txt" />
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