sbase

commit e27c55aec3550024a66a2b8a32047b7518b2cac1
parent 7a5369ae04736f0f83a253b5a598822b10fb39fb
Author: sin <sin@2f30.org>
Date:   Tue,  7 Jan 2014 11:53:55 +0000

Implement -E eofstr for xargs(1)

Diffstat:
M
xargs.1
 | 
7
++++++-
M
xargs.c
 | 
12
+++++++++---

2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/xargs.1 b/xargs.1
@@ -4,8 +4,10 @@ xargs \- constuct argument list(s) and execute command
 .SH SYNOPSIS
 .B xargs
 .RB [ \-r ]
+.RB [ \-E
+.IR eofstr ]
 .RI [ cmd
-.RI [arg... ] ]
+.IR [arg... ] ]
 .SH DESCRIPTION
 xargs reads space, tab, newline and EOF delimited strings from stdin
 and executes the specified cmd with the strings as arguments.
@@ -26,6 +28,9 @@ newlines, may be escaped by a backslash.
 .BI \-r
 Do not run the command if there are no arguments.  Normally the command is
 executed at least once even if there are no arguments.
+.TP
+.B \-E eofstr
+Use eofstr as a logical EOF marker.
 .SH EXIT STATUS
 xargs exits with one of the following values:
 
diff --git a/xargs.c b/xargs.c
@@ -27,12 +27,13 @@ static char *argb;
 static size_t argbsz = 1;
 static size_t argbpos;
 static int nerrors = 0;
+static char *eofstr;
 static int rflag = 0;
 
 static void
 usage(void)
 {
-	eprintf("usage: %s [-r] [cmd [arg...]]\n", argv0);
+	eprintf("usage: %s [-r] [-E eofstr] [cmd [arg...]]\n", argv0);
 }
 
 int
@@ -46,6 +47,9 @@ main(int argc, char *argv[])
 	case 'r':
 		rflag = 1;
 		break;
+	case 'E':
+		eofstr = EARGF(usage());
+		break;
 	default:
 		usage();
 	} ARGEND;
@@ -186,9 +190,8 @@ poparg(void)
 	while ((ch = inputc()) != EOF) {
 		switch (ch) {
 		case ' ': case '\t': case '\n':
-			fillbuf('\0');
 			deinputc(ch);
-			return argb;
+			goto out;
 		case '\'':
 			if (parsequote('\'') == -1)
 				enprintf(EXIT_FAILURE,
@@ -209,8 +212,11 @@ poparg(void)
 			break;
 		}
 	}
+out:
 	if (argbpos > 0) {
 		fillbuf('\0');
+		if (eofstr && strcmp(argb, eofstr) == 0)
+			return NULL;
 		return argb;
 	}
 	return NULL;