Improve compatibility groff's soelim

While here implement -C from GNU groff

Reported by:	delphij

2 files changed, 29 insertions, 10 deletions

diff --git a/usr.bin/soelim/soelim.1 b/usr.bin/soelim/soelim.1
index af6e7f7..b6ec13c 100644
--- a/usr.bin/soelim/soelim.1
+++ b/usr.bin/soelim/soelim.1
@@ -48,9 +48,9 @@ it replace the line by processing
 Otherwise the line is printed to stdout.
 .Bl -tag -width "-I dir"
 .It Fl C
-Compatibility with GNU groff's
-.Xr soelim 1
-(does nothing).
+Recognise
+.Em .so
+when not followed by a space character.
 .It Fl r
 Compatibility with GNU groff's
 .Xr soelim 1
diff --git a/usr.bin/soelim/soelim.c b/usr.bin/soelim/soelim.c
index 26f85d6..700ae57 100644
--- a/usr.bin/soelim/soelim.c
+++ b/usr.bin/soelim/soelim.c
@@ -39,6 +39,8 @@ __FBSDID("$FreeBSD$");
 #include <err.h>
 #include <ctype.h>
 
+#define C_OPTION 0x1
+
 static StringList *includes;
 
 static void
@@ -81,10 +83,10 @@ soelim_fopen(const char *name)
 }
 
 static int
-soelim_file(FILE *f)
+soelim_file(FILE *f, int flag)
 {
 	char *line = NULL;
-	char *walk;
+	char *walk, *cp;
 	size_t linecap = 0;
 	ssize_t linelen;
 
@@ -96,13 +98,27 @@ soelim_file(FILE *f)
 			printf("%s", line);
 			continue;
 		}
+
 		walk = line + 3;
+		if (!isspace(*walk) && ((flag & C_OPTION) == 0)) {
+			printf("%s", line);
+			continue;
+		}
+
 		while (isspace(*walk))
 			walk++;
 
-		while (isspace(walk[strlen(walk) - 1]))
-			walk[strlen(walk) - 1] = '\0';
-		if (soelim_file(soelim_fopen(walk)) == 1) {
+		cp = walk + strlen(walk) - 1;
+		while (cp > walk && isspace(*cp)) {
+			*cp = 0;
+			cp--;
+		}
+
+		if (*walk == '\0') {
+			printf("%s", line);
+			continue;
+		}
+		if (soelim_file(soelim_fopen(walk), flag) == 1) {
 			free(line);
 			return (1);
 		}
@@ -119,6 +135,7 @@ main(int argc, char **argv)
 {
 	int ch, i;
 	int ret = 0;
+	int flags = 0;
 
 	includes = sl_init();
 	if (includes == NULL)
@@ -127,6 +144,8 @@ main(int argc, char **argv)
 	while ((ch = getopt(argc, argv, "CrtvI:")) != -1) {
 		switch (ch) {
 		case 'C':
+			flags |= C_OPTION;
+			break;
 		case 'r':
 		case 'v':
 		case 't':
@@ -145,10 +164,10 @@ main(int argc, char **argv)
 	argv += optind;
 
 	if (argc == 0)
-		ret = soelim_file(stdin);
+		ret = soelim_file(stdin, flags);
 
 	for (i = 0; i < argc; i++)
-		ret = soelim_file(soelim_fopen(argv[i]));
+		ret = soelim_file(soelim_fopen(argv[i]), flags);
 
 	sl_free(includes, 0);