misc: Add `remove_trailing_whitespace()`

This function removes any whitespace found at the end of the supplied
string.

This can be useful when you have a string with whitespace throughout it,
but only want the whitespace at the end removed.

2 files changed, 12 insertions, 0 deletions

diff --git a/misc.c b/misc.c
index 36bbad4..462a3bd 100644
--- a/misc.c
+++ b/misc.c
@@ -89,6 +89,17 @@ char *find_delm(char *str, const char *delm, int skip_delm) {
 	}
 }
 
+char *remove_trailing_whitespace(char *str) {
+	const char *whitespace = " \t\v\r\n";
+	char *s = str;
+
+	for (char *tmp = s; !is_empty(tmp); s = tmp, tmp = find_delm(tmp, whitespace, 1));
+
+	s = find_delm(s, whitespace, 0);
+	*s = '\0';
+	return str;
+}
+
 char *get_str_delm_range(char *str, const char *start_delm, const char *end_delm, char **rhs) {
 	if (!is_empty(str)) {
 		char *start = find_delm(str, start_delm, 1);
diff --git a/misc.h b/misc.h
index eb839de..338c546 100644
--- a/misc.h
+++ b/misc.h
@@ -5,6 +5,7 @@
 
 extern char *read_file(const char *filename, long *size);
 extern char *find_delm(char *str, const char *delm, int skip_delm);
+extern char *remove_trailing_whitespace(char *str);
 extern char *get_str_delm_range(char *str, const char *start_delm, const char *end_delm, char **rhs);
 extern char *get_line(char **str);
 extern char *make_str(const char *str);