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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
*/
#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;
fstat(infd, &st);
if (!TT.b && TT.n) {
if (lseek(infd, 0, SEEK_CUR) < 0)
error_exit("cannot determine file size");
TT.b = st.st_size / TT.n;
}
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;
if (TT.n && filenum == TT.n && st.st_size % 2)
++bytesleft;
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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