sbase

commit 74c0b4775f7a3ebffe02e8028b01066b37e771e7
parent 6b950e436b9d81edb982d740d02198ba184402fb
Author: Joachim Lundberg <joachim.lundberg@telia.com>
Date:   Wed,  3 Apr 2019 13:53:51 +0200

Add a header flag for sort.

Diffstat:
M
sort.1
 | 
2
++
M
sort.c
 | 
15
++++++++++++---

2 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/sort.1 b/sort.1
@@ -39,6 +39,8 @@ indicating the location of the disorder.
 Skip non-whitespace and non-alphanumeric characters.
 .It Fl f
 Ignore letter case when sorting.
+.It FL h
+First line is header line; do not sort it.
 .It FL i
 Skip non-printable characters.
 .It Fl k Ar key
diff --git a/sort.c b/sort.c
@@ -31,6 +31,7 @@ enum {
 	MOD_D      = 1 << 4,
 	MOD_F      = 1 << 5,
 	MOD_I      = 1 << 6,
+	MOD_H      = 1 << 7,
 };
 
 static TAILQ_HEAD(kdhead, keydef) kdhead = TAILQ_HEAD_INITIALIZER(kdhead);
@@ -319,7 +320,7 @@ addkeydef(char *kdstr, int flags)
 static void
 usage(void)
 {
-	enprintf(2, "usage: %s [-Cbcdfimnru] [-o outfile] [-t delim] "
+	enprintf(2, "usage: %s [-Cbcdfhimnru] [-o outfile] [-t delim] "
 	         "[-k def]... [file ...]\n", argv0);
 }
 
@@ -348,6 +349,9 @@ main(int argc, char *argv[])
 	case 'f':
 		global_flags |= MOD_F;
 		break;
+	case 'h':
+		global_flags |= MOD_H;
+		break;
 	case 'i':
 		global_flags |= MOD_I;
 		break;
@@ -417,8 +421,13 @@ main(int argc, char *argv[])
 		if (outfile && !(ofp = fopen(outfile, "w")))
 			eprintf("fopen %s:", outfile);
 
-		qsort(linebuf.lines, linebuf.nlines, sizeof(*linebuf.lines),
-				(int (*)(const void *, const void *))slinecmp);
+		if ((global_flags & MOD_H) && linebuf.nlines > 1) {
+			qsort(linebuf.lines + 1, linebuf.nlines - 1, sizeof(*linebuf.lines),
+					(int (*)(const void *, const void *))slinecmp);
+		} else {
+			qsort(linebuf.lines, linebuf.nlines, sizeof(*linebuf.lines),
+					(int (*)(const void *, const void *))slinecmp);
+		}
 
 		for (i = 0; i < linebuf.nlines; i++) {
 			if (!uflag || i == 0 ||