mirror of
https://github.com/sheumann/hush.git
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142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* split - split a file into pieces
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* Copyright (c) 2007 Bernhard Fischer
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT: SUSv3 compliant
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* SUSv3 requirements:
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* http://www.opengroup.org/onlinepubs/009695399/utilities/split.html
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*/
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#include "busybox.h"
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static unsigned suffix_len = 2;
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static const struct suffix_mult split_suffices[] = {
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#if ENABLE_FEATURE_SPLIT_FANCY
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{ "b", 512 },
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#endif
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{ "k", 1024 },
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{ "m", 1024*1024 },
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#if ENABLE_FEATURE_SPLIT_FANCY
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{ "g", 1024*1024*1024 },
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#endif
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{ NULL, 0 }
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};
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/* Increment the suffix part of the filename.
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* Returns 0 on success and 1 on error (if we are out of files)
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*/
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static bool next_file(char **old)
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{
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size_t end = strlen(*old);
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unsigned i = 1;
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char *curr;
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do {
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curr = *old + end - i;
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if (*curr < 'z') {
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*curr += 1;
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break;
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}
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i++;
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if (i > suffix_len) {
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bb_error_msg("Suffices exhausted");
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return 1;
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}
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*curr = 'a';
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} while (i <= suffix_len);
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return 0;
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}
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#define SPLIT_OPT_l (1<<0)
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#define SPLIT_OPT_b (1<<1)
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#define SPLIT_OPT_a (1<<2)
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int split_main(int argc, char **argv);
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int split_main(int argc, char **argv)
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{
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char *pfx;
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char *count_p;
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char *sfx_len;
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unsigned cnt = 1000;
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char *input_file;
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bool ret = EXIT_SUCCESS;
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FILE *fp;
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//XXX: FIXME opt_complementary = "+2"; /* at most 2 non-option arguments */
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getopt32(argc, argv, "l:b:a:", &count_p, &count_p, &sfx_len);
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argv += optind;
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if (option_mask32 & SPLIT_OPT_l)
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cnt = xatoi(count_p);
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if (option_mask32 & SPLIT_OPT_b)
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cnt = xatoul_sfx(count_p, split_suffices);
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if (option_mask32 & SPLIT_OPT_a)
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suffix_len = xatoi(sfx_len);
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if (!*argv)
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*--argv = (char*) "-";
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input_file = *argv;
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if (NAME_MAX < strlen(*argv) + suffix_len)
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bb_error_msg_and_die("Suffix too long");
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fp = fopen_or_warn_stdin(input_file);
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{
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char *char_p = xzalloc(suffix_len);
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memset(char_p, 'a', suffix_len);
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pfx = xasprintf("%s%s", (argc > optind + 1) ? *++argv : "x", char_p);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(char_p);
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}
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//XXX:FIXME: unify those two file-handling schemata below (FILE vs fd) !
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if (option_mask32 & SPLIT_OPT_b) {
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char *buf;
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ssize_t i;
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ssize_t bytes = 0;
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int flags = O_WRONLY | O_CREAT | O_TRUNC;
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int inp = fileno(fp);
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do {
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int out = xopen(pfx, flags);
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buf = xzalloc(cnt);
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lseek(inp, bytes, SEEK_SET);
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bytes += i = full_read(inp, buf, cnt);
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xwrite(out, buf, i);
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close(out);
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free(buf);
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if (next_file(&pfx)) {
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ret++;
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goto bail;
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}
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} while (i == cnt); /* if we read less than cnt, then nothing is left */
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} else { /* -l */
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char *buf;
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do {
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unsigned i = cnt;
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int flags = O_WRONLY | O_CREAT | O_TRUNC;
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int out = xopen(pfx, flags);
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buf = NULL;
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while (i--) {
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buf = xmalloc_fgets(fp);
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if (buf == NULL)
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break;
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xwrite(out, buf, buf ? strlen(buf) : 0);
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free(buf);
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};
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close(out);
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if (next_file(&pfx)) {
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ret++;
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goto bail;
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}
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} while (buf);
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}
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bail:
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(pfx);
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fclose_if_not_stdin(fp);
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}
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return ret;
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}
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