tools lib: Adopt strim() from the kernel

Since we're working on moving stuff out of tools/perf/util/ to
tools/lib/, take the opportunity to adopt routines from the kernel that
are equivalent, so that tools/ code look more like the kernel.

Cc: Adrian Hunter <[email protected]>
Cc: André Goddard Rosa <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 25 insertions, 0 deletions

diff --git a/tools/lib/string.c b/tools/lib/string.c
index 50d400822bb3..80472e6b3829 100644
--- a/tools/lib/string.c
+++ b/tools/lib/string.c
@@ -120,3 +120,28 @@ char *skip_spaces(const char *str)
 		++str;
 	return (char *)str;
 }
+
+/**
+ * strim - Removes leading and trailing whitespace from @s.
+ * @s: The string to be stripped.
+ *
+ * Note that the first trailing whitespace is replaced with a %NUL-terminator
+ * in the given string @s. Returns a pointer to the first non-whitespace
+ * character in @s.
+ */
+char *strim(char *s)
+{
+	size_t size;
+	char *end;
+
+	size = strlen(s);
+	if (!size)
+		return s;
+
+	end = s + size - 1;
+	while (end >= s && isspace(*end))
+		end--;
+	*(end + 1) = '\0';
+
+	return skip_spaces(s);
+}