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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define NUM_MODE_NONE 0
#define NUM_MODE_ALL 1
#define NUM_MODE_NONBLANK 2
static void
help(void)
{
printf(
"usage: cat <flags> <file>\n"
"[-b] do not number blank lines\n"
"[-n] number all lines\n"
);
}
static void
cat(const char *pathname, int num_mode)
{
FILE *file;
char buf[64];
int fd;
size_t lineno = 1;
file = fopen(pathname, "r");
if (file == NULL) {
return;
}
while (fgets(buf, sizeof(buf), file) != NULL) {
switch (num_mode) {
case NUM_MODE_NONE:
break;
case NUM_MODE_ALL:
printf("%d ", lineno);
break;
case NUM_MODE_NONBLANK:
if (buf[0] == '\n') {
break;
}
printf("%d ", lineno);
break;
}
printf("%s", buf);
++lineno;
}
fclose(file);
}
int
main(int argc, char **argv)
{
int num_mode = NUM_MODE_NONE;
int c;
if (argc < 2) {
help();
return -1;
}
while ((c = getopt(argc, argv, "nb")) != -1) {
switch (c) {
case 'n':
num_mode = NUM_MODE_ALL;
break;
case 'b':
num_mode = NUM_MODE_NONBLANK;
break;
}
}
for (size_t i = optind; i < argc; ++i) {
cat(argv[i], num_mode);
}
return 0;
}
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