sbase/head.c
sin b8edf3b4ee Add weprintf() and replace fprintf(stderr, ...) calls
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.
2013-11-13 11:41:43 +00:00

61 lines
963 B
C

/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
static void head(FILE *, const char *, long);
static void
usage(void)
{
eprintf("usage: %s [-n] [FILE...]\n", argv0);
}
int
main(int argc, char *argv[])
{
long n = 10;
FILE *fp;
ARGBEGIN {
case 'n':
n = estrtol(EARGF(usage()), 0);
break;
ARGNUM:
n = ARGNUMF(0);
break;
default:
usage();
} ARGEND;
if(argc == 0) {
head(stdin, "<stdin>", n);
} else for(; argc > 0; argc--, argv++) {
if(!(fp = fopen(argv[0], "r"))) {
weprintf("fopen %s:", argv[0]);
continue;
}
head(fp, argv[0], n);
fclose(fp);
}
return EXIT_SUCCESS;
}
void
head(FILE *fp, const char *str, long n)
{
char buf[BUFSIZ];
long i = 0;
while(i < n && fgets(buf, sizeof buf, fp)) {
fputs(buf, stdout);
if(buf[strlen(buf)-1] == '\n')
i++;
}
if(ferror(fp))
eprintf("%s: read error:", str);
}