mirror of
https://github.com/sheumann/hush.git
synced 2024-08-14 11:28:58 +00:00
function old new delta bkm_suffixes - 32 +32 static.km_suffixes 24 - -24 suffixes 32 - -32 static.bkm 32 - -32 head_tail_suffixes 32 - -32 ------------------------------------------------------------------------------ (add/remove: 2/6 grow/shrink: 0/0 up/down: 72/-160) Total: -88 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
259 lines
5.3 KiB
C
259 lines
5.3 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* head implementation for busybox
|
|
*
|
|
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
/* BB_AUDIT SUSv3 compliant */
|
|
/* BB_AUDIT GNU compatible -c, -q, and -v options in 'fancy' configuration. */
|
|
/* http://www.opengroup.org/onlinepubs/007904975/utilities/head.html */
|
|
|
|
//kbuild:lib-$(CONFIG_HEAD) += head.o
|
|
|
|
//usage:#define head_trivial_usage
|
|
//usage: "[OPTIONS] [FILE]..."
|
|
//usage:#define head_full_usage "\n\n"
|
|
//usage: "Print first 10 lines of each FILE (or stdin) to stdout.\n"
|
|
//usage: "With more than one FILE, precede each with a filename header.\n"
|
|
//usage: "\n -n N[kbm] Print first N lines"
|
|
//usage: IF_FEATURE_FANCY_HEAD(
|
|
//usage: "\n -n -N[kbm] Print all except N last lines"
|
|
//usage: "\n -c [-]N[kbm] Print first N bytes"
|
|
//usage: "\n -q Never print headers"
|
|
//usage: "\n -v Always print headers"
|
|
//usage: )
|
|
//usage: "\n"
|
|
//usage: "\nN may be suffixed by k (x1024), b (x512), or m (x1024^2)."
|
|
//usage:
|
|
//usage:#define head_example_usage
|
|
//usage: "$ head -n 2 /etc/passwd\n"
|
|
//usage: "root:x:0:0:root:/root:/bin/bash\n"
|
|
//usage: "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
|
|
|
|
#include "libbb.h"
|
|
|
|
/* This is a NOEXEC applet. Be very careful! */
|
|
|
|
#if !ENABLE_FEATURE_FANCY_HEAD
|
|
# define print_first_N(fp,count,bytes) print_first_N(fp,count)
|
|
#endif
|
|
static void
|
|
print_first_N(FILE *fp, unsigned long count, bool count_bytes)
|
|
{
|
|
#if !ENABLE_FEATURE_FANCY_HEAD
|
|
const int count_bytes = 0;
|
|
#endif
|
|
while (count) {
|
|
int c = getc(fp);
|
|
if (c == EOF)
|
|
break;
|
|
if (count_bytes || (c == '\n'))
|
|
--count;
|
|
putchar(c);
|
|
}
|
|
}
|
|
|
|
#if ENABLE_FEATURE_FANCY_HEAD
|
|
static void
|
|
print_except_N_last_bytes(FILE *fp, unsigned count)
|
|
{
|
|
unsigned char *circle = xmalloc(++count);
|
|
unsigned head = 0;
|
|
for(;;) {
|
|
int c;
|
|
c = getc(fp);
|
|
if (c == EOF)
|
|
goto ret;
|
|
circle[head++] = c;
|
|
if (head == count)
|
|
break;
|
|
}
|
|
for (;;) {
|
|
int c;
|
|
if (head == count)
|
|
head = 0;
|
|
putchar(circle[head]);
|
|
c = getc(fp);
|
|
if (c == EOF)
|
|
goto ret;
|
|
circle[head] = c;
|
|
head++;
|
|
}
|
|
ret:
|
|
free(circle);
|
|
}
|
|
|
|
static void
|
|
print_except_N_last_lines(FILE *fp, unsigned count)
|
|
{
|
|
char **circle = xzalloc((++count) * sizeof(circle[0]));
|
|
unsigned head = 0;
|
|
for(;;) {
|
|
char *c;
|
|
c = xmalloc_fgets(fp);
|
|
if (!c)
|
|
goto ret;
|
|
circle[head++] = c;
|
|
if (head == count)
|
|
break;
|
|
}
|
|
for (;;) {
|
|
char *c;
|
|
if (head == count)
|
|
head = 0;
|
|
fputs(circle[head], stdout);
|
|
c = xmalloc_fgets(fp);
|
|
if (!c)
|
|
goto ret;
|
|
free(circle[head]);
|
|
circle[head++] = c;
|
|
}
|
|
ret:
|
|
head = 0;
|
|
for(;;) {
|
|
free(circle[head++]);
|
|
if (head == count)
|
|
break;
|
|
}
|
|
free(circle);
|
|
}
|
|
#else
|
|
/* Must never be called */
|
|
void print_except_N_last_bytes(FILE *fp, unsigned count);
|
|
void print_except_N_last_lines(FILE *fp, unsigned count);
|
|
#endif
|
|
|
|
#if !ENABLE_FEATURE_FANCY_HEAD
|
|
# define eat_num(negative_N,p) eat_num(p)
|
|
#endif
|
|
static unsigned long
|
|
eat_num(bool *negative_N, const char *p)
|
|
{
|
|
#if ENABLE_FEATURE_FANCY_HEAD
|
|
if (*p == '-') {
|
|
*negative_N = 1;
|
|
p++;
|
|
}
|
|
#endif
|
|
return xatoul_sfx(p, bkm_suffixes);
|
|
}
|
|
|
|
static const char head_opts[] ALIGN1 =
|
|
"n:"
|
|
#if ENABLE_FEATURE_FANCY_HEAD
|
|
"c:qv"
|
|
#endif
|
|
;
|
|
|
|
#define header_fmt_str "\n==> %s <==\n"
|
|
|
|
int head_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int head_main(int argc, char **argv)
|
|
{
|
|
unsigned long count = 10;
|
|
#if ENABLE_FEATURE_FANCY_HEAD
|
|
int header_threshhold = 1;
|
|
bool count_bytes = 0;
|
|
bool negative_N = 0;
|
|
#else
|
|
# define header_threshhold 1
|
|
# define count_bytes 0
|
|
# define negative_N 0
|
|
#endif
|
|
FILE *fp;
|
|
const char *fmt;
|
|
char *p;
|
|
int opt;
|
|
int retval = EXIT_SUCCESS;
|
|
|
|
#if ENABLE_INCLUDE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD
|
|
/* Allow legacy syntax of an initial numeric option without -n. */
|
|
if (argv[1] && argv[1][0] == '-'
|
|
&& isdigit(argv[1][1])
|
|
) {
|
|
--argc;
|
|
++argv;
|
|
p = argv[0] + 1;
|
|
goto GET_COUNT;
|
|
}
|
|
#endif
|
|
|
|
/* No size benefit in converting this to getopt32 */
|
|
while ((opt = getopt(argc, argv, head_opts)) > 0) {
|
|
switch (opt) {
|
|
#if ENABLE_FEATURE_FANCY_HEAD
|
|
case 'q':
|
|
header_threshhold = INT_MAX;
|
|
break;
|
|
case 'v':
|
|
header_threshhold = -1;
|
|
break;
|
|
case 'c':
|
|
count_bytes = 1;
|
|
/* fall through */
|
|
#endif
|
|
case 'n':
|
|
p = optarg;
|
|
#if ENABLE_INCLUDE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD
|
|
GET_COUNT:
|
|
#endif
|
|
count = eat_num(&negative_N, p);
|
|
break;
|
|
default:
|
|
bb_show_usage();
|
|
}
|
|
}
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (!*argv)
|
|
*--argv = (char*)"-";
|
|
|
|
fmt = header_fmt_str + 1;
|
|
if (argc <= header_threshhold) {
|
|
#if ENABLE_FEATURE_FANCY_HEAD
|
|
header_threshhold = 0;
|
|
#else
|
|
fmt += 11; /* "" */
|
|
#endif
|
|
}
|
|
if (negative_N) {
|
|
if (count >= INT_MAX / sizeof(char*))
|
|
bb_error_msg("count is too big: %lu", count);
|
|
}
|
|
|
|
do {
|
|
fp = fopen_or_warn_stdin(*argv);
|
|
if (fp) {
|
|
if (fp == stdin) {
|
|
*argv = (char *) bb_msg_standard_input;
|
|
}
|
|
if (header_threshhold) {
|
|
printf(fmt, *argv);
|
|
}
|
|
if (negative_N) {
|
|
if (count_bytes) {
|
|
print_except_N_last_bytes(fp, count);
|
|
} else {
|
|
print_except_N_last_lines(fp, count);
|
|
}
|
|
} else {
|
|
print_first_N(fp, count, count_bytes);
|
|
}
|
|
die_if_ferror_stdout();
|
|
if (fclose_if_not_stdin(fp)) {
|
|
bb_simple_perror_msg(*argv);
|
|
retval = EXIT_FAILURE;
|
|
}
|
|
} else {
|
|
retval = EXIT_FAILURE;
|
|
}
|
|
fmt = header_fmt_str;
|
|
} while (*++argv);
|
|
|
|
fflush_stdout_and_exit(retval);
|
|
}
|