coreutils

yes: Add yes utility

Diffstat

4 files changed, 45 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e05d39..8cf8706 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,3 +16,4 @@ ADD_EXECUTABLE(dirname  ${CMAKE_SOURCE_DIR}/src/dirname.c)
 ADD_EXECUTABLE(echo     ${CMAKE_SOURCE_DIR}/src/echo.c)
 ADD_EXECUTABLE(false    ${CMAKE_SOURCE_DIR}/src/false.c)
 ADD_EXECUTABLE(true     ${CMAKE_SOURCE_DIR}/src/true.c)
+ADD_EXECUTABLE(yes      ${CMAKE_SOURCE_DIR}/src/yes.c)
diff --git a/README.md b/README.md
index 0ba8b2e..1378735 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ commonly found on UNIX-like systems.
 | echo             | Write arguments to standard output       | POSIX    |
 | false            | Return false value                       | POSIX    |
 | true             | Return true value                        | POSIX    |
+| yes              | Output a string repeatedly               |          |
 
 ## Build Instructions
 
diff --git a/man/yes.1 b/man/yes.1
new file mode 100644
index 0000000..dc77e8a
--- /dev/null
+++ b/man/yes.1
@@ -0,0 +1,18 @@
+.TH YES 1 2020-06-26 "OMKOV coreutils" "General Commands Manual"
+.SH NAME
+yes \(em output a string repeatedly
+.SH SYNOPSYS
+\fByes\fR [\fIstring\fR]
+.SH DESCRIPTION
+Repeatedly output \fIstring\fR, or 'y' if unspecified, to standard output.
+.SH OPERANDS
+The following operand is supported:
+.TP
+.I string
+A string to be written to standard output.
+.SH COPYRIGHT
+.nf
+Copyright (C) 2020, Jakob Wakeling
+All rights reserved.
+OMKOV Public Domain Licence (https://www.omkov.net/OLPD)
+.fi
diff --git a/src/yes.c b/src/yes.c
new file mode 100644
index 0000000..8f8c342
--- /dev/null
+++ b/src/yes.c
@@ -0,0 +1,25 @@
+// yes.c, version 1.0.0
+// OMKOV coreutils implementation of yes
+// Copyright (C) 2020, Jakob Wakeling
+// All rights reserved.
+
+/*
+OMKOV Public Domain Licence, version 1.0
+
+Permission is hereby granted to deal with this software and its associated
+documentation files without restriction.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT
+HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
+*/
+
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+	if (argc == 1) for (;;) { fputc('y', stdout); fputc('\n', stdout); }
+	else for (;;) { puts(argv[1]); } return 0;
+}