utils

echo.c (1107B)

// Collection of Unix tools, comparable to coreutils
// SPDX-FileCopyrightText: 2017-2022 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
#define _POSIX_C_SOURCE 200809L
#include <stdio.h>  /* perror */
#include <stdlib.h> /* malloc */
#include <string.h> /* strlen */
#include <unistd.h> /* write */
int
main(int argc, char *argv[])
{
	size_t arg_len = 0;
	char *buffer, *buffer_p;
	int err = 0;
	if(argc < 2)
	{
		arg_len++;
	}
	for(int i = 1; i < argc; i++)
	{
		arg_len += strlen(argv[i]) + 1; // str + space|newline
	}
	buffer = malloc(arg_len);
	if(buffer == NULL)
	{
		perror("malloc(arg_len)");
		return 1;
	}
	buffer_p = buffer;
	for(int i = 1; i < argc; i++)
	{
		/* flawfinder: ignore, consider that arguments are safely separated by NULL */
		buffer_p = strcpy(buffer_p, argv[i]);
		buffer_p += strlen(buffer_p);
		if(i < argc - 1)
		{
			*buffer_p++ = ' ';
		}
	}
	*buffer_p++ = '\n';
	if(write(1, buffer, arg_len) < (ssize_t)arg_len)
	{
		perror("write(1, buffer, arg_len)");
		err++;
	}
	free(buffer);
	return err;
}