The branch main has been updated by christos: URL: https://cgit.FreeBSD.org/src/commit/?id=ac17fc816e67a4e5e2e481b5001577a8d589f8b6
commit ac17fc816e67a4e5e2e481b5001577a8d589f8b6 Author: Jan Schaumann <[email protected]> AuthorDate: 2023-05-30 13:13:16 +0000 Commit: Christos Margiolis <[email protected]> CommitDate: 2023-05-30 13:13:16 +0000 split(1): add '-c' to continue creating files Currently, split(1) will clobber any existing output files: $ split file; ls xaa xab xac xad $ split second-file; ls xaa xab xac xad xae xaf This patch adds a flag "-c" (mnemonic "create, don't overwrite" or "continue where you left off"): $ split file; ls xaa xab xac xad $ split -c second-file; ls xaa xab xac xad xae xaf xag xah xai xaj Reviewed by: christos Approved by: kevans Different Revision: https://reviews.freebsd.org/D38553 --- usr.bin/split/split.1 | 20 ++++++++++++++++---- usr.bin/split/split.c | 28 ++++++++++++++++++++-------- 2 files changed, 36 insertions(+), 12 deletions(-) diff --git a/usr.bin/split/split.1 b/usr.bin/split/split.1 index ee7c3d412db4..31a82073a801 100644 --- a/usr.bin/split/split.1 +++ b/usr.bin/split/split.1 @@ -36,12 +36,12 @@ .Nd split a file into pieces .Sh SYNOPSIS .Nm -.Op Fl d +.Op Fl cd .Op Fl l Ar line_count .Op Fl a Ar suffix_length .Op Ar file Op Ar prefix .Nm -.Op Fl d +.Op Fl cd .Fl b Ar byte_count Ns .Oo .Sm off @@ -51,12 +51,12 @@ .Op Fl a Ar suffix_length .Op Ar file Op Ar prefix .Nm -.Op Fl d +.Op Fl cd .Fl n Ar chunk_count .Op Fl a Ar suffix_length .Op Ar file Op Ar prefix .Nm -.Op Fl d +.Op Fl cd .Fl p Ar pattern .Op Fl a Ar suffix_length .Op Ar file Op Ar prefix @@ -112,6 +112,9 @@ or is appended to the number, the file is split into .Ar byte_count gigabyte pieces. +.It Fl c +Continue creating files and do not overwrite existing +output files. .It Fl d Use a numeric suffix instead of a alphabetic suffix. .It Fl l Ar line_count @@ -163,6 +166,15 @@ argument is not specified, the file is split into lexically ordered files named with the prefix .Dq Li x and with suffixes as above. +.Pp +By default, +.Nm +will overwrite any existing output files. +If the +.Fl c +flag is specified, +.Nm +will instead create files with names that do not already exist. .Sh ENVIRONMENT The .Ev LANG , LC_ALL , LC_CTYPE diff --git a/usr.bin/split/split.c b/usr.bin/split/split.c index 769567b28325..91710899a9e9 100644 --- a/usr.bin/split/split.c +++ b/usr.bin/split/split.c @@ -67,6 +67,7 @@ static const char sccsid[] = "@(#)split.c 8.2 (Berkeley) 4/16/94"; static off_t bytecnt; /* Byte count to split on. */ static off_t chunks = 0; /* Chunks count to split into. */ +static bool clobber = true; /* Whether to overwrite existing output files. */ static long numlines; /* Line count to split on. */ static int file_open; /* If a file open. */ static int ifd = -1, ofd = -1; /* Input/output file descriptors. */ @@ -93,7 +94,7 @@ main(int argc, char **argv) setlocale(LC_ALL, ""); dflag = false; - while ((ch = getopt(argc, argv, "0123456789a:b:dl:n:p:")) != -1) + while ((ch = getopt(argc, argv, "0123456789a:b:cdl:n:p:")) != -1) switch (ch) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': @@ -125,6 +126,9 @@ main(int argc, char **argv) if (error == -1) errx(EX_USAGE, "%s: offset too large", optarg); break; + case 'c': /* Continue, don't overwrite output files. */ + clobber = false; + break; case 'd': /* Decimal suffix */ dflag = true; break; @@ -347,6 +351,10 @@ newfile(void) static char *fpnt; char beg, end; int pattlen; + int flags = O_WRONLY | O_CREAT | O_TRUNC; + + if (!clobber) + flags |= O_EXCL; if (ofd == -1) { if (fname[0] == '\0') { @@ -355,9 +363,10 @@ newfile(void) } else { fpnt = fname + strlen(fname); } - ofd = fileno(stdout); - } + } else if (close(ofd) != 0) + err(1, "%s", fname); + again: if (dflag) { beg = '0'; end = '9'; @@ -417,8 +426,11 @@ newfile(void) fpnt[sufflen] = '\0'; ++fnum; - if (!freopen(fname, "w", stdout)) + if ((ofd = open(fname, flags, DEFFILEMODE)) < 0) { + if (!clobber && errno == EEXIST) + goto again; err(EX_IOERR, "%s", fname); + } file_open = 1; } @@ -426,9 +438,9 @@ static void usage(void) { (void)fprintf(stderr, -"usage: split [-d] [-l line_count] [-a suffix_length] [file [prefix]]\n" -" split [-d] -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]]\n" -" split [-d] -n chunk_count [-a suffix_length] [file [prefix]]\n" -" split [-d] -p pattern [-a suffix_length] [file [prefix]]\n"); +"usage: split [-cd] [-l line_count] [-a suffix_length] [file [prefix]]\n" +" split [-cd] -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]]\n" +" split [-cd] -n chunk_count [-a suffix_length] [file [prefix]]\n" +" split [-cd] -p pattern [-a suffix_length] [file [prefix]]\n"); exit(EX_USAGE); }
