CopyFast/CopyFast.cpp at master · tsalmon/CopyFast · GitHub

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#include<iostream>
#include<stdlib.h>
#include<stdio.h>
#include<cstdio>
#include"CopyFast.h"

usingnamespacestd;

FILE *tmp_file = fopen("tmpfile.tmp", "w");

int size_origin_file = 0;
int size_target_file = 0;

intstrsize(char *str)
{
int i = 0;
while(str[i++] != '\0'){}
return (i);
}

intfilesize(char *f_name)
{
char c[100];
FILE* f = fopen(f_name, "r");
int k = 0;
while(fgets(c, sizeof c, f))
 {
 k++;
 }
return (k);
}

// x^y
intpow(int x, int y)
{
int i = 1, k = x;
for(i; i < y; i++)
 {
 x*= k;
 }
return x;
}

intStrToInt(char *str)
{
if(str[0] == '\0')
 {
return (-1);
 }
int k = 0;
int i = 0;
int p = pow(10, strsize(str) - 1);
while(str[i] != '\0'){
if(str[i] > 47 && str[i] < 58)
 {
	k += (str[i++] - 48) * p;
	p /= 10;
 }
else
 {
	cout << "'" << str << "' isn't a number" << endl;
return -1;
 }
 }
return (k/10);
}

//write the content of filename from x to y to tmpfile
voidwrite_file(FILE *f, int x, int y)
{
char line[1000];
int k = 0;
for(k; k < x && fgets(line, sizeof line, f); k++);
for(k; k < y && fgets(line, sizeof line, f); k++)
 {
printf("%s\n", line);
fputs(line, tmp_file);
 }
}

interror(FILE *origin_f, FILE *target_f, int l1, int l2, int l3)
{
if(l1 == -1 || l2 == -1 || l3 == -1)
return -1;
if(l1 > size_origin_file || l2 > size_origin_file || l3 > size_target_file)
 {
printf("lines must not be out of the files");
return -1;
 }
if(l1 > l2)
 {
 cout << "'" << l2 << "' doesn't be sup than '" << l1 << "'" << endl;
return -1;
 }
if(origin_f == NULL)
 {
 std::cout << "origin file doesnt exist" << endl;
return -1;
 }
if(target_f == NULL)
 {
 std::cout << "target file doesnt exist" << endl;
return -1;
 }
return0;
}

//Algorithm
//make tmp file
//write in tmpfile: read target_f [0; l3[
//write in tmpfile: read origin_f [l1; l2]
//write in tmpfile: read target_f [l3; EoF[
//rename tmp file: target_f
voidfile_copy(char *origin_f, char *l_1, char *l_2, char *target_f, char *l_3)
{
int l1 = StrToInt(l_1), l2 = StrToInt(l_2), l3 = StrToInt(l_3);
FILE *origin_file = fopen(origin_f, "r");
FILE *target_file = fopen(target_f, "r");
 size_origin_file = filesize(origin_f);
 size_target_file = filesize(target_f);
if(error(origin_file, target_file, l1, l2, l3) == -1)
return;
write_file(target_file, 0, l3);
write_file(origin_file, l1, l2);
write_file(target_file, l3+1, size_target_file);
rename("tmpfile.tmp", target_f);
fclose(origin_file);
fclose(target_file);
fclose(tmp_file);
}