mirror of
https://github.com/sheumann/hush.git
synced 2024-11-18 17:10:36 +00:00
122 lines
2.3 KiB
C
122 lines
2.3 KiB
C
/*
|
|
* rev implementation for busybox
|
|
*
|
|
* Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
//applet:IF_REV(APPLET(rev, BB_DIR_BIN, BB_SUID_DROP))
|
|
|
|
//kbuild:lib-$(CONFIG_REV) += rev.o
|
|
|
|
//config:config REV
|
|
//config: bool "rev"
|
|
//config: default y
|
|
//config: help
|
|
//config: Reverse lines of a file or files.
|
|
|
|
//usage:#define rev_trivial_usage
|
|
//usage: "[FILE]..."
|
|
//usage:#define rev_full_usage "\n\n"
|
|
//usage: "Reverse lines of FILE"
|
|
|
|
#include "libbb.h"
|
|
#include "unicode.h"
|
|
|
|
#undef CHAR_T
|
|
#if ENABLE_UNICODE_SUPPORT
|
|
# define CHAR_T wchar_t
|
|
#else
|
|
# define CHAR_T char
|
|
#endif
|
|
|
|
/* In-place invert */
|
|
static void strrev(CHAR_T *s, int len)
|
|
{
|
|
int i;
|
|
|
|
if (len != 0) {
|
|
len--;
|
|
if (len != 0 && s[len] == '\n')
|
|
len--;
|
|
}
|
|
|
|
for (i = 0; i < len; i++, len--) {
|
|
CHAR_T c = s[i];
|
|
s[i] = s[len];
|
|
s[len] = c;
|
|
}
|
|
}
|
|
|
|
int rev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int rev_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int retval;
|
|
size_t bufsize;
|
|
char *buf;
|
|
|
|
init_unicode();
|
|
|
|
getopt32(argv, "");
|
|
argv += optind;
|
|
if (!argv[0])
|
|
argv = (char **)&bb_argv_dash;
|
|
|
|
retval = EXIT_SUCCESS;
|
|
bufsize = 256;
|
|
buf = xmalloc(bufsize);
|
|
do {
|
|
size_t pos;
|
|
FILE *fp;
|
|
|
|
fp = fopen_or_warn_stdin(*argv++);
|
|
if (!fp) {
|
|
retval = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
|
|
pos = 0;
|
|
while (1) {
|
|
/* Read one line */
|
|
buf[bufsize - 1] = 1; /* not 0 */
|
|
if (!fgets(buf + pos, bufsize - pos, fp))
|
|
break; /* EOF/error */
|
|
if (buf[bufsize - 1] == '\0' /* fgets filled entire buffer */
|
|
&& buf[bufsize - 2] != '\n' /* and did not read '\n' */
|
|
&& !feof(fp)
|
|
) {
|
|
/* Line is too long, extend buffer */
|
|
pos = bufsize - 1;
|
|
bufsize += 64 + bufsize / 8;
|
|
buf = xrealloc(buf, bufsize);
|
|
continue;
|
|
}
|
|
|
|
/* Process and print it */
|
|
#if ENABLE_UNICODE_SUPPORT
|
|
{
|
|
wchar_t *tmp = xmalloc(bufsize * sizeof(wchar_t));
|
|
/* Convert to wchar_t (might error out!) */
|
|
int len = mbstowcs(tmp, buf, bufsize);
|
|
if (len >= 0) {
|
|
strrev(tmp, len);
|
|
/* Convert back to char */
|
|
wcstombs(buf, tmp, bufsize);
|
|
}
|
|
free(tmp);
|
|
}
|
|
#else
|
|
strrev(buf, strlen(buf));
|
|
#endif
|
|
fputs(buf, stdout);
|
|
}
|
|
fclose(fp);
|
|
} while (*argv);
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
free(buf);
|
|
|
|
fflush_stdout_and_exit(retval);
|
|
}
|