/* read_lines.cpp

 */



#include <stdio.h>

#include <string>

#include <vector>



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

{

	if (argc < 2)

	{

		fprintf(stderr, "Usage: read_lines filename\n");

		return 1;

	}



	FILE *fp = fopen(argv[1], "r");

	if (!fp)

	{

		fprintf(stderr, "Failed to open %s\n", argv[1]);

		return 2;

	}



	typedef std::vector< std::string > lines_t;

	lines_t lines;



	const size_t buffer_size = 1024;

	char *buffer = new char[buffer_size];



	std::string residue;



	while (!feof(fp) && !ferror(fp))

	{

		size_t bytes_read = fread(buffer, 1, buffer_size, fp);



		const char *buffer_end = buffer + bytes_read;

		

		const char *b = buffer;

		const char *e;

		while((e = (const char *)memchr(b, '\n', buffer_end - b)) != NULL)

		{

			std::string line(b, e);

			residue += line;

			lines.push_back(residue);

			residue.clear();



			b = e + 1;

		}



		// Is there any residue?

		if (b < buffer_end)

		{

			// There's some residue

			residue += std::string(b, buffer_end);

		}

	}



	if (!residue.empty())

		lines.push_back(residue);



	delete [] buffer;



	fclose(fp);



	int n = 0;

	for (lines_t::const_iterator i = lines.begin(); i != lines.end(); ++i)

	{

		++n;

		printf("%d: %s\n", n, i->c_str());

	}



	return 0;

}