Cat & Split

/*

 * Copyright (c) 2005 by Romuald DELAVERGNE

 * It can be redistributed under the terms of the GNU General Public License.

*/

#include <stdlib.h>

#include <stdio.h>

#include <fcntl.h>

#include <io.h>

#include <dir.h>

void

exitOnError(char *msg) {

	perror(msg);

	exit(1);

}

int

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

	void *buf;

	int handle, n, done;

	struct ffblk ffblk;

	char *prog = argv[0];

	buf = malloc(BUFSIZ);

	if (argc == 1) {

		printf("%s: too few parameters !\n", prog);

		printf("concatenate files and print on the standard output\n");

		printf("usage: %s FILE [FILE...]\n", prog);

		exit(0);

	}

	while (--argc > 0) {

		done = findfirst(*++argv, &ffblk, 0);

		while (!done) {

			if ((handle = _open(ffblk.ff_name, O_RDONLY|O_BINARY)) == -1) exitOnError(prog);

			while (!eof(handle))

				if ((n = _read(handle, buf, BUFSIZ)) == -1 || _write(1, buf, n) == -1)

					exitOnError(prog);

			_close(handle);

			done = findnext(&ffblk);

		}

	}

	return 0;

}

/*

 * Copyright (c) 2005 by Romuald DELAVERGNE

 * It can be redistributed under the terms of the GNU General Public License.

*/

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <sys/stat.h>

#include <io.h>

void

exitOnError(char *msg) {

	perror(msg);

	exit(1);

}

int

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

	void *buf;

	struct stat statFileIn;

	FILE *fileIn, *fileOut;

	char

		fileName[255],

		*prog = argv[0],

		*prefix = argv[3];

	unsigned long

		nbFiles, lastSize, maxSize, size, nb, nbWrited, nbRest;

	int i;

	buf = malloc(BUFSIZ);

	if (argc < 4) {

		printf("%s: too few parameters !\n", prog);

		printf("split a file into pieces\n");

		printf("usage: %s FILE SIZE PREFIX\n", prog);

		printf("  FILE  : big file to split\n");

		printf("  SIZE  : size in bytes\n");

		printf("  PREFIX: result files without suffix\n");

		exit(0);

	}

	if ((fileIn = fopen(argv[1], "rb")) == NULL) exitOnError(argv[1]);

	if (fstat(fileIn->fd, &statFileIn) == -1) exitOnError(argv[1]);

	if (sscanf(argv[2], "%lu", &maxSize) == 0) {

		fprintf(stderr, "%s: invalid size !\n", argv[2]);

		exit(1);

	}

	nbFiles = statFileIn.st_size/maxSize;

	lastSize = statFileIn.st_size%maxSize;

	if (lastSize > 0) nbFiles++; else lastSize = maxSize;

	i = 0;

	while (i < nbFiles) {

		i++;

		size = (i == nbFiles) ? lastSize: maxSize;

		sprintf(fileName, "%s.%03d", prefix, i);

		if (access(fileName, 0) == 0) {

			fprintf(stderr, "%s: file already exists !\n", fileName);

			exit(1);

		}

		if ((fileOut = fopen(fileName, "wb")) == NULL) exitOnError(fileName);

		nbWrited = 0;

		while (nbWrited < size) {

			nbRest = size - nbWrited;

			nb = (nbRest < BUFSIZ) ? nbRest: BUFSIZ;

			if (fread(buf, nb, 1, fileIn) != 1) exitOnError(prog);

			if (fwrite(buf, nb, 1, fileOut) != 1) exitOnError(prog);

			nbWrited += nb;

		}

		fclose(fileOut);

	}

	fclose(fileIn);

	return 0;

}