This was a fun little project. It’s the unix cat command, but the code’s shaped like a cat! :D
The only warning that might show up is due to libc #includes (<sys/errno.h> vs <errno.h>)
Supports -n (number) and -s (squeeze) options.
If you’re too lazy to just go to the repository, here’s the cat code:
#include <sys/errno.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "argp.h"
void cat
(FILE* f,int
num,int squeeze)
{unsigned cur,last,i;
char /* >:3 */ *line =
NULL;size_t linecap=0
;ssize_t len;cur =last
= i = 0;while((len = getline
(&line, &linecap, f)) > 0) { i++; if (squeeze) { cur =
len == 1; if (cur && last) continue; last = cur;}if (num)
printf("%-8d%s", i, line);else printf("%s", line);}free(line);
}int main(int argc, char **argv) { int i, nflag, sflag ;
FILE *fp; nflag = sflag = 0;ARGBEGIN {case 'n':nflag++ ; ;
break;case 's':sflag++;break ; default: fprintf(stderr , //
"%s [-ns] [file ...]\n" , progname) ;;;
return 1;} ARGEND;
if(argc ==0){
cat(stdin , nflag,
sflag) ; }else{
for(i =0;i<
argc; i++){
if (! strcmp
(argv[i] ,"-"))fp
= stdin;else fp = fopen(argv[i], "r");if (fp != NULL) cat(fp,
nflag, sflag);else err(errno, "couldn't open \'%s\'", argv[i]
);fclose(fp);}}}/***************** ROOMBA ******************/