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