utils-std

commit: 950209f1a77e7bcdb063f9c56c0502517085fa9b
parent 69cbb114a926327ac256e2007d4208ba734e1fad
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Thu,  5 Feb 2026 11:51:28 +0100

cmd/cut: Add support for -u option

Another method is to flush stdout after each read(), but switching
from FILE* + getdelim() to something else would be a bit of a
hassle right now.

Diffstat:
M
cmd/cut.1
12
+++++++++---
M
cmd/cut.c
7
+++++--

2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/cmd/cut.1 b/cmd/cut.1
@@ -10,16 +10,16 @@
 .Sh SYNOPSIS
 .Nm
 .Fl b Ar list
-.Op Fl nz
+.Op Fl nuz
 .Op Ar file...
 .Nm
 .Fl c Ar list
-.Op Fl z
+.Op Fl uz
 .Op Ar file...
 .Nm
 .Fl f Ar list
 .Op Fl d Ar delim
-.Op Fl sz
+.Op Fl suz
 .Op Ar file...
 .Sh DESCRIPTION
 .Nm
@@ -79,6 +79,8 @@ If the last byte of a codepoint is part of the selection, it gets printed, other
 .It Fl s
 Suppress lines with no delimiter characters,
 otherwise whole delimiter-less lines are printed as-is.
+.It Fl u
+Switch to line-buffering, instead of full-buffering when non-interactive.
 .It Fl z
 Use NULL as line separator instead of newline.
 .El
@@ -89,5 +91,9 @@ Use NULL as line separator instead of newline.
 should be compliant with the
 IEEE Std 1003.1-2024 (“POSIX.1”)
 specification.
+.Pp
+The
+.Fl u
+option is an utils-std extension.
 .Sh AUTHORS
 .An Haelwenn (lanodan) Monnier Aq Mt contact+utils@hacktivis.me
diff --git a/cmd/cut.c b/cmd/cut.c
@@ -458,9 +458,9 @@ main(int argc, char *argv[])
 	// clang-format on
 
 	// Need + as first character to get POSIX-style option parsing
-	for(int c = -1; (c = getopt_long(argc, argv, "+:b:c:d:f:nsz", opts, NULL)) != -1;)
+	for(int c = -1; (c = getopt_long(argc, argv, "+:b:c:d:f:nsuz", opts, NULL)) != -1;)
 #else
-	for(int c = -1; (c = getopt_nolong(argc, argv, ":b:c:d:f:nsz")) != -1;)
+	for(int c = -1; (c = getopt_nolong(argc, argv, ":b:c:d:f:nsuz")) != -1;)
 #endif
 	{
 		switch(c)
@@ -509,6 +509,9 @@ main(int argc, char *argv[])
 		case 's':
 			opt_s = true;
 			break;
+		case 'u':
+			setvbuf(stdout, NULL, _IOLBF, 0);
+			break;
 		case 'z':
 			line_delim = '\0';
 			line_delim_w = L'\0';