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- /* split.c - split a file into smaller files
- *
- * Copyright 2013 Rob Landley <rob@landley.net>
- *
- * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/split.html
- *
- * Standard does not cover:
- * - should splitting an empty file produce an empty outfile? (Went with "no".)
- * - permissions on output file
- USE_SPLIT(NEWTOY(split, ">2a#<1=2>9b#<1l#<1n#<1[!bl][!bn][!ln]", TOYFLAG_USR|TOYFLAG_BIN))
- config SPLIT
- bool "split"
- default y
- help
- usage: split [-a SUFFIX_LEN] [-b BYTES] [-l LINES] [-n PARTS] [INPUT [OUTPUT]]
- Copy INPUT (or stdin) data to a series of OUTPUT (or "x") files with
- alphabetically increasing suffix (aa, ab, ac... az, ba, bb...).
- -a Suffix length (default 2)
- -b BYTES/file (10, 10k, 10m, 10g...)
- -l LINES/file (default 1000)
- -n PARTS many equal length files
- */
- #define FOR_split
- #include "toys.h"
- GLOBALS(
- long n, l, b, a;
- char *outfile;
- )
- static void do_split(int infd, char *in)
- {
- unsigned long bytesleft, linesleft, filenum, len, pos;
- int outfd = -1;
- struct stat st;
- // posix doesn't cover permissions on output file, so copy input (or 0777)
- st.st_mode = 0777;
- st.st_size = 0;
- fstat(infd, &st);
- if (TT.n && (TT.b = st.st_size/TT.n)<1) return error_msg("%s: no size", in);
- len = pos = filenum = bytesleft = linesleft = 0;
- for (;;) {
- int i, j;
- // Refill toybuf?
- if (len == pos) {
- if (!(len = xread(infd, toybuf, sizeof(toybuf)))) break;
- pos = 0;
- }
- // Start new output file?
- if ((TT.b && !bytesleft) || (TT.l && !linesleft)) {
- char *s = TT.outfile + strlen(TT.outfile);
- j = filenum++;
- for (i = 0; i<TT.a; i++) {
- *(--s) = 'a'+(j%26);
- j /= 26;
- }
- if (j) error_exit("bad suffix");
- bytesleft = TT.b + ((filenum == TT.n) ? st.st_size%TT.n : 0);
- linesleft = TT.l;
- xclose(outfd);
- outfd = xcreate(TT.outfile, O_RDWR|O_CREAT|O_TRUNC, st.st_mode & 0777);
- }
- // Write next chunk of output.
- if (TT.l) {
- for (i = pos; i < len; ) {
- if (toybuf[i++] == '\n' && !--linesleft) break;
- if (!--bytesleft) break;
- }
- j = i - pos;
- } else {
- j = len - pos;
- if (j > bytesleft) j = bytesleft;
- bytesleft -= j;
- }
- xwrite(outfd, toybuf+pos, j);
- pos += j;
- }
- if (CFG_TOYBOX_FREE) {
- xclose(outfd);
- if (infd) close(infd);
- free(TT.outfile);
- }
- xexit();
- }
- void split_main(void)
- {
- if (!TT.b && !TT.l && !TT.n) TT.l = 1000;
- // Allocate template for output filenames
- TT.outfile = xmprintf("%s%*c", (toys.optc == 2) ? toys.optargs[1] : "x",
- (int)TT.a, ' ');
- // We only ever use one input, but this handles '-' or no input for us.
- loopfiles(toys.optargs, do_split);
- }
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