files.cpp
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	#include "stdio.h"
	#include "string.h"
	#include "files.h"

	#define MAXLINE 256

	/* ---------------------------------------------------------------------- */

	void replace(char file, char header, int n, char **lines)
	{
	FILE *fpr = fopen(file,"r");
	FILE *fpw = fopen("tmp.file","w");

	char line[MAXLINE];
	while (fgets(line,MAXLINE,fpr)) {
	if (strstr(line,header)) {
	fprintf(fpw,"%s",line);
	for (int i = 0; i < n; i++) {
	fgets(line,MAXLINE,fpr);
	fprintf(fpw,"%s",lines[i]);
	}
	} else fprintf(fpw,"%s",line);
	}

	fclose(fpr);
	fclose(fpw);
	rename("tmp.file",file);
	}

	/* ---------------------------------------------------------------------- */

	char *extract(char file, char header, int n, char *lines)
	{
	FILE *fp = fopen(file,"r");

	char line[MAXLINE];
	while (fgets(line,MAXLINE,fp)) {
	if (strstr(line,header)) {
	for (int i = 0; i < n; i++) {
	fgets(line,MAXLINE,fp);
	sprintf(lines[i],"%s",line);
	}
	break;
	}
	}

	fclose(fp);
	}