#include <stdio.h>
#include <memory.h>

void
main( int argc, char *argv[] )
{

	FILE *fp;

	fp = fopen( argv[1], "rt" );
	if ( fp == NULL ) {
		exit( 1 );
	}

	char buffer[4096];
	int line;
	int len;
	int i;
	int TargetLen;

	TargetLen = strlen( argv[2] );

	line = 0;
	while( 1 ) {
		fgets( buffer, 4096, fp );
		if ( feof( fp ) ) {
			break;
		}

		line++;
		len = strlen( buffer );
		for( i = 0; i < len; i++ ) {
			if ( memcmp( buffer+i, argv[2], TargetLen ) == 0 ) {
				printf( "%d : %s", line, buffer );
				break;
			}
		}

	}

	fclose( fp );

}

#include <stdio.h>
#include <memory.h>

void
main( int argc, char *argv[] )
{

	FILE *fp;

	fp = fopen( argv[1], "rt" );
	if ( fp == NULL ) {
		exit( 1 );
	}

	char buffer[4096];
	char buffer2[4096];
	int line;
	int len;
	int i,j;
	int TargetLen;
	int ReplaceLen;

	TargetLen = strlen( argv[2] );
	ReplaceLen = strlen( argv[3] );

	line = 0;
	while( 1 ) {
		fgets( buffer, 4096, fp );
		if ( feof( fp ) ) {
			break;
		}

		memset( buffer2, 0x00, 4096 );
		line++;
		len = strlen( buffer );
		j = 0;
		for( i = 0; i < len; i++ ) {
			if ( memcmp( buffer+i, argv[2], TargetLen ) == 0 ) {
				strcat( buffer2, argv[3] );
				j = j + ReplaceLen;
				i = i + TargetLen - 1;
			}
			else {
				buffer2[j] = buffer[i];
				j++;
			}
		}

		printf( "%s", buffer2 );

	}

	fclose( fp );

}