ed: Implement non truncate writes - sbase - suckless unix tools
HTML git clone git://git.suckless.org/sbase
DIR Log
DIR Files
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DIR README
DIR LICENSE
---
DIR commit 5765a6e6b434ce692a15ed2e64bc2ea0d1c5a2e1
DIR parent 08b8c73ddaf92727f8e9a93f2c0d60eb0183caa4
HTML Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date: Sat, 13 Dec 2025 12:05:39 +0100
ed: Implement non truncate writes
The trunc parameter of dowrite() was ignored, making no difference
between the w and W commands.
Diffstat:
M ed.c | 4 +++-
A tests/0018-ed.sh | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+), 1 deletion(-)
---
DIR diff --git a/ed.c b/ed.c
@@ -761,6 +761,7 @@ dowrite(const char *fname, int trunc)
FILE *aux;
static int sh;
static FILE *fp;
+ char *mode;
if (fp) {
sh ? pclose(fp) : fclose(fp);
@@ -774,7 +775,8 @@ dowrite(const char *fname, int trunc)
error("bad exec");
} else {
sh = 0;
- if ((fp = fopen(fname, "w")) == NULL)
+ mode = (trunc) ? "w" : "a";
+ if ((fp = fopen(fname, mode)) == NULL)
error("cannot open input file");
}
DIR diff --git a/tests/0018-ed.sh b/tests/0018-ed.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+tmp=tmp.$$
+
+trap 'rm -f $tmp' EXIT
+trap 'rm -f $tmp; kill -KILL $$' HUP INT TERM
+
+touch $tmp
+../ed -s $tmp <<EOF | (read a && test $a = 1)
+a
+1
+.
+w
+,c
+2
+.
+W
+e
+1p
+EOF