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authorRob Landley <rob@landley.net>2013-06-16 16:37:43 -0500
committerRob Landley <rob@landley.net>2013-06-16 16:37:43 -0500
commitc2305e895d92412761d5be258c2b73064a7061ed (patch)
tree66517bba1038959e0ce82cf39f0299c0e19776ee
parent5b2510562c26fbb41dd0f93326e4eb3f4f349b50 (diff)
downloadtoybox-c2305e895d92412761d5be258c2b73064a7061ed.tar.gz
Implement split.
-rw-r--r--toys/posix/split.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/toys/posix/split.c b/toys/posix/split.c
new file mode 100644
index 00000000..f80527d9
--- /dev/null
+++ b/toys/posix/split.c
@@ -0,0 +1,108 @@
+/* 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#<1", TOYFLAG_USR|TOYFLAG_BIN))
+
+config SPLIT
+ bool "split"
+ default y
+ help
+ usage: split [-a SUFFIX_LEN] [-b BYTES] [-l LINES] [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)
+*/
+
+#define FOR_split
+#include "toys.h"
+
+GLOBALS(
+ long lines;
+ long bytes;
+ long suflen;
+
+ char *outfile;
+)
+
+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);
+
+ 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.bytes && !bytesleft) || (TT.lines && !linesleft)) {
+ char *s = TT.outfile + strlen(TT.outfile);
+
+ j = filenum++;
+ for (i = 0; i<TT.suflen; i++) {
+ *(--s) = 'a'+(j%26);
+ j /= 26;
+ }
+ if (j) error_exit("bad suffix");
+ bytesleft = TT.bytes;
+ linesleft = TT.lines;
+ if (outfd != -1) close(outfd);
+ outfd = xcreate(TT.outfile, O_RDWR|O_CREAT|O_TRUNC, st.st_mode & 0777);
+ }
+
+ // Write next chunk of output.
+ if (TT.lines) {
+ 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) {
+ if (outfd != -1) close(outfd);
+ if (infd) close(infd);
+ free(TT.outfile);
+ }
+ xexit();
+}
+
+void split_main(void)
+{
+ if (!TT.bytes && !TT.lines) TT.lines = 1000;
+
+ // Allocate template for output filenames
+ TT.outfile = xmsprintf("%s% *c", (toys.optc == 2) ? toys.optargs[1] : "x",
+ (int)TT.suflen, ' ');
+
+ // We only ever use one input, but this handles '-' or no input for us.
+ loopfiles(toys.optargs, do_split);
+}