Implement 'split -d' which allows a numeric suffix instead of an

alphabetic one.

PR:		bin/116209
Submitted by:	Marcin Gryszkalis <mg@fork.pl> (adapted from)
Reviewed by:	will
MFC after:	1 week

2 files changed, 29 insertions, 5 deletions

diff --git a/usr.bin/split/split.1 b/usr.bin/split/split.1
index 308b016..f6056bb 100644
--- a/usr.bin/split/split.1
+++ b/usr.bin/split/split.1
@@ -36,10 +36,12 @@
 .Nd split a file into pieces
 .Sh SYNOPSIS
 .Nm
+.Fl d
 .Op Fl l Ar line_count
 .Op Fl a Ar suffix_length
 .Op Ar file Op Ar prefix
 .Nm
+.Fl d
 .Fl b Ar byte_count Ns
 .Oo
 .Sm off
@@ -49,10 +51,12 @@
 .Op Fl a Ar suffix_length
 .Op Ar file Op Ar prefix
 .Nm
+.Fl d
 .Fl n Ar chunk_count
 .Op Fl a Ar suffix_length
 .Op Ar file Op Ar prefix
 .Nm
+.Fl d
 .Fl p Ar pattern
 .Op Fl a Ar suffix_length
 .Op Ar file Op Ar prefix
@@ -108,6 +112,8 @@ or
 is appended to the number, the file is split into
 .Ar byte_count
 gigabyte pieces.
+.It Fl d
+Use a numeric suffix instead of a alphabetic suffix.
 .It Fl l Ar line_count
 Create split files
 .Ar line_count
diff --git a/usr.bin/split/split.c b/usr.bin/split/split.c
index be4befe..561113e 100644
--- a/usr.bin/split/split.c
+++ b/usr.bin/split/split.c
@@ -51,6 +51,7 @@ static const char sccsid[] = "@(#)split.c	8.2 (Berkeley) 4/16/94";
 #include <inttypes.h>
 #include <limits.h>
 #include <locale.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -70,6 +71,7 @@ static char	 bfr[MAXBSIZE];		/* I/O buffer. */
 static char	 fname[MAXPATHLEN];	/* File name prefix. */
 static regex_t	 rgx;
 static int	 pflag;
+static bool	 dflag;
 static long	 sufflen = 2;		/* File name suffix length. */
 
 static void newfile(void);
@@ -88,7 +90,8 @@ main(int argc, char **argv)
 
 	setlocale(LC_ALL, "");
 
-	while ((ch = getopt(argc, argv, "0123456789a:b:l:n:p:")) != -1)
+	dflag = false;
+	while ((ch = getopt(argc, argv, "0123456789a:b:dl: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':
@@ -131,6 +134,9 @@ main(int argc, char **argv)
 				errx(EX_USAGE, "%s: offset too large", optarg);
 			bytecnt = (off_t)(bytecnti * scale);
 			break;
+		case 'd':		/* Decimal suffix */
+			dflag = true;
+			break;
 		case 'l':		/* Line count. */
 			if (numlines != 0)
 				usage();
@@ -348,6 +354,8 @@ newfile(void)
 	long i, maxfiles, tfnum;
 	static long fnum;
 	static char *fpnt;
+	char beg, end;
+	int pattlen;
 
 	if (ofd == -1) {
 		if (fname[0] == '\0') {
@@ -359,9 +367,19 @@ newfile(void)
 		ofd = fileno(stdout);
 	}
 
-	/* maxfiles = 26^sufflen, but don't use libm. */
+	if (dflag) {
+		beg = '0';
+		end = '9';
+	}
+	else {
+		beg = 'a';
+		end = 'z';
+	}
+	pattlen = end - beg + 1;
+
+	/* maxfiles = pattlen^sufflen, but don't use libm. */
 	for (maxfiles = 1, i = 0; i < sufflen; i++)
-		if ((maxfiles *= 26) <= 0)
+		if ((maxfiles *= pattlen) <= 0)
 			errx(EX_USAGE, "suffix is too long (max %ld)", i);
 
 	if (fnum == maxfiles)
@@ -371,8 +389,8 @@ newfile(void)
 	tfnum = fnum;
 	i = sufflen - 1;
 	do {
-		fpnt[i] = tfnum % 26 + 'a';
-		tfnum /= 26;
+		fpnt[i] = tfnum % pattlen + beg;
+		tfnum /= pattlen;
 	} while (i-- > 0);
 	fpnt[sufflen] = '\0';