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/* vi: set sw=4 ts=4: */
/*
* split - split a file into pieces
* Copyright (c) 2007 Bernhard Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT: not yet SUSV3 compliant; FIXME: add -bN{k,m}
* SUSv3 requirements:
* http://www.opengroup.org/onlinepubs/009695399/utilities/split.html
*/
#include "busybox.h"
static unsigned suffix_len = 2;
static const struct suffix_mult split_suffices[] = {
#if ENABLE_FEATURE_SPLIT_FANCY
{ "b", 512 },
#endif
{ "k", 1024 },
{ "m", 1024*1024 },
#if ENABLE_FEATURE_SPLIT_FANCY
{ "g", 1024*1024*1024 },
#endif
{ NULL, 0 }
};
/* Increment the suffix part of the filename.
* Returns 0 on success and 1 on error (if we are out of files)
*/
static bool next_file(char **old)
{
size_t end = strlen(*old);
unsigned i = 1;
char *curr;
do {
curr = *old + end - i;
if (*curr < 'z') {
*curr += 1;
break;
}
*curr = 'a';
i++;
} while (i <= suffix_len);
if ((*curr == 'z') && (i == suffix_len))
return 1;
return 0;
}
#define SPLIT_OPT_l (1<<0)
#define SPLIT_OPT_b (1<<1)
#define SPLIT_OPT_a (1<<2)
int split_main(int argc, char **argv);
int split_main(int argc, char **argv)
{
char *pfx;
char *count_p;
char *sfx_len;
unsigned cnt = 1000;
char *input_file;
//XXX: FIXME opt_complementary = "+2"; /* at most 2 non-option arguments */
getopt32(argc, argv, "l:b:a:", &count_p, &count_p, &sfx_len);
argv += optind;
if (option_mask32 & (SPLIT_OPT_l|SPLIT_OPT_b))
cnt = xatoi(count_p);
if (option_mask32 & SPLIT_OPT_a)
suffix_len = xatoul(sfx_len);
if (!*argv)
*--argv = (char*) "-";
input_file = *argv;
if (NAME_MAX < strlen(*argv) + suffix_len)
bb_error_msg_and_die("Suffix too long");
{
char *char_p = xzalloc(suffix_len);
memset(char_p, 'a', suffix_len);
pfx = xasprintf("%s%s", (argc > optind + 1) ? *++argv : "x", char_p);
if (ENABLE_FEATURE_CLEAN_UP)
free(char_p);
}
//XXX:FIXME: unify those two file-handling schemata below (FILE vs fd) !
if (option_mask32 & SPLIT_OPT_b) {
char *buf;
ssize_t i;
ssize_t bytes = 0;
int inp = xopen(input_file, O_RDONLY);
int flags = O_WRONLY | O_CREAT | O_TRUNC;
do {
int out = xopen(pfx, flags);
buf = xzalloc(cnt);
lseek(inp, bytes, SEEK_SET);
bytes += i = full_read(inp, buf, cnt);
xwrite(out, buf, i);
close(out);
free(buf);
if (next_file(&pfx))
flags = O_WRONLY | O_APPEND;
} while(i > 0);
} else { /* -l */
FILE *fp = fopen_or_warn_stdin(input_file);
char *buf;
do {
unsigned i = cnt;
int flags = O_WRONLY | O_CREAT | O_TRUNC;
int out = xopen(pfx, flags);
buf = NULL;
while (i--) {
buf = xmalloc_fgets(fp);
if (buf == NULL)
break;
xwrite(out, buf, buf ? strlen(buf) : 0);
free(buf);
};
close(out);
if (next_file(&pfx))
flags = O_WRONLY | O_APPEND;
} while (buf);
if (ENABLE_FEATURE_CLEAN_UP)
fclose_if_not_stdin(fp);
}
if (ENABLE_FEATURE_CLEAN_UP) {
free(pfx);
}
return EXIT_SUCCESS;
}
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