mirror of
git://git.suckless.org/sbase
synced 2024-12-23 15:34:38 +00:00
b8edf3b4ee
There is still some programs left to be updated for this. Many of these programs would stop on the first file that they could not open.
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
/* See LICENSE file for copyright and license details. */
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include "text.h"
|
|
#include "util.h"
|
|
|
|
static void dropinit(FILE *, const char *, long);
|
|
static void taketail(FILE *, const char *, long);
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
eprintf("usage: %s [-n lines] [file]\n", argv0);
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
long n = 10;
|
|
FILE *fp;
|
|
void (*tail)(FILE *, const char *, long) = taketail;
|
|
char *lines;
|
|
|
|
ARGBEGIN {
|
|
case 'n':
|
|
lines = EARGF(usage());
|
|
n = abs(estrtol(lines, 0));
|
|
if(lines[0] == '+')
|
|
tail = dropinit;
|
|
break;
|
|
ARGNUM:
|
|
n = ARGNUMF(0);
|
|
break;
|
|
default:
|
|
usage();
|
|
} ARGEND;
|
|
if(argc == 0) {
|
|
tail(stdin, "<stdin>", n);
|
|
} else {
|
|
for (; argc > 0; argc--, argv++) {
|
|
if(!(fp = fopen(argv[0], "r"))) {
|
|
weprintf("fopen %s:", argv[0]);
|
|
continue;
|
|
}
|
|
tail(fp, argv[0], n);
|
|
fclose(fp);
|
|
}
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
void
|
|
dropinit(FILE *fp, const char *str, long n)
|
|
{
|
|
char buf[BUFSIZ];
|
|
long i = 0;
|
|
|
|
while(i < n && fgets(buf, sizeof buf, fp))
|
|
if(buf[strlen(buf)-1] == '\n')
|
|
i++;
|
|
concat(fp, str, stdout, "<stdout>");
|
|
}
|
|
|
|
void
|
|
taketail(FILE *fp, const char *str, long n)
|
|
{
|
|
char **ring;
|
|
long i, j;
|
|
size_t *size = NULL;
|
|
|
|
if(!(ring = calloc(n, sizeof *ring)) || !(size = calloc(n, sizeof *size)))
|
|
eprintf("calloc:");
|
|
for(i = j = 0; afgets(&ring[i], &size[i], fp); i = j = (i+1)%n)
|
|
;
|
|
if(ferror(fp))
|
|
eprintf("%s: read error:", str);
|
|
|
|
do {
|
|
if(ring[j]) {
|
|
fputs(ring[j], stdout);
|
|
free(ring[j]);
|
|
}
|
|
} while((j = (j+1)%n) != i);
|
|
free(ring);
|
|
free(size);
|
|
}
|