stringHandling.c

#include "stringHandling.h"
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <string.h>

//gcc -c stringHandling.c -std=c99 -lm

String copyString(String s1, String s2) {
	return strcpy(s1, s2);
}

int stringSize(String string) {
	return strlen(string);
}

String intToString(int integer) {
	int stringSize = log10(integer) + 1;
	String string = (String) malloc(sizeof(stringSize));
	sprintf(string, "%d", integer);
	return string;
}
//string to integer
int stringToInt(String string) {
	return strtol(string, NULL, 10);
}

boolean isCapitalChar(char c) {
	if((c >= 'A') && (c <= 'Z'))
		return true;
	return false;
}

boolean isSmallChar(char c) {
	if((c >= 'a') && (c <= 'z'))
		return true;
	return false;
}

boolean isChar(char c) {
	if(isSmallChar(c) || isCapitalChar(c))
		return true;
	return false;
}

int checkOccurence(String string, char c) {
	int size = stringSize(string);
	int times = 0;
	for(int i = 0; i < size; i++)
		if(c == string[i]) 
			times++;
	return times;
}

char getCapitalChar(char c) {
	if(isCapitalChar(c))
		return c;
	return c - 32;
}

char getSmallChar(char c) {
	if(isSmallChar(c))
		return c;
	return c + 32;
}

String lowerToUpper(String s) {
	int size = strlen(s);
	String upper = (String) malloc(sizeof(size));
	int i = 0;
	while(s[i] != '\0') {
		if(s[i] >= 'a' && s[i] <= 'z') 
			upper[i] = s[i] - 32;
		else
			upper[i] = s[i];
		i++;
	}
	return upper;
} 

String upperToLower(String s) {
	int size = strlen(s);
	String lower = (String) malloc(sizeof(size));
	int i = 0;
	while(s[i] != '\0') {
		if(s[i] >= 'A' && s[i] <= 'Z') 
			lower[i] = s[i] + 32;
		else 
			lower[i] = s[i];
		i++;
	}
	return lower;
}

boolean isEqual(String s1, String s2) {
	return !strcmp(s1, s2);
} 

String concat(String s1, String s2) {
	strcat(s1, s2);
}

String substring(String s, int begin, int end) {
	String sub = (String) malloc(sizeof(char) * (end - begin + 2));
	int i, j;
	for(i = begin, j = 0; i <= end; i++, j++) {
		sub[j] = s[i];
	}
	sub[i] = '\0';
	return sub;
}