Remove custom getdelim(3) and fix a small memory leak.

Originally from Andre Smagin.

Obtained from:	OpenBSD
MFC after:	1 week

3 files changed, 28 insertions, 72 deletions

diff --git a/usr.bin/sort/file.c b/usr.bin/sort/file.c
index 7a35a1be023ce..0a0088947deef 100644
--- a/usr.bin/sort/file.c
+++ b/usr.bin/sort/file.c
@@ -188,42 +188,6 @@ file_is_tmp(const char* fn)
 }
 
 /*
- * Read zero-terminated line from a file
- */
-char *
-read_file0_line(struct file0_reader *f0r)
-{
-	size_t pos = 0;
-	int c;
-
-	if ((f0r->f == NULL) || feof(f0r->f))
-		return (NULL);
-
-	if (f0r->current_line && f0r->current_sz > 0)
-		f0r->current_line[0] = 0;
-
-	while (!feof(f0r->f)) {
-		c = fgetc(f0r->f);
-		if (feof(f0r->f) || (c == -1))
-			break;
-		if ((pos + 1) >= f0r->current_sz) {
-			size_t newsz = (f0r->current_sz + 2) * 2;
-			f0r->current_line = sort_realloc(f0r->current_line,
-			    newsz);
-			f0r->current_sz = newsz;
-		}
-		f0r->current_line[pos] = (char)c;
-		if (c == 0)
-			break;
-		else
-			f0r->current_line[pos + 1] = 0;
-		++pos;
-	}
-
-	return f0r->current_line;
-}
-
-/*
  * Generate new temporary file name
  */
 char *
diff --git a/usr.bin/sort/file.h b/usr.bin/sort/file.h
index dbb03609585ef..e87fafda1c851 100644
--- a/usr.bin/sort/file.h
+++ b/usr.bin/sort/file.h
@@ -70,16 +70,6 @@ struct file_list
 	bool			 tmp;
 };
 
-/*
- * Structure for zero-separated file reading (for input files list)
- */
-struct file0_reader
-{
-	char			*current_line;
-	FILE			*f;
-	size_t			 current_sz;
-};
-
 /* memory */
 
 /**/
@@ -110,8 +100,6 @@ struct file_reader *file_reader_init(const char *fsrc);
 struct bwstring *file_reader_readline(struct file_reader *fr);
 void file_reader_free(struct file_reader *fr);
 
-char *read_file0_line(struct file0_reader *f0r);
-
 void init_tmp_files(void);
 void clear_tmp_files(void);
 char *new_tmp_file_name(void);
diff --git a/usr.bin/sort/sort.c b/usr.bin/sort/sort.c
index 0d725d622891e..43ae43ce4650a 100644
--- a/usr.bin/sort/sort.c
+++ b/usr.bin/sort/sort.c
@@ -229,34 +229,38 @@ usage(bool opt_err)
 static void
 read_fns_from_file0(const char *fn)
 {
-	if (fn) {
-		struct file0_reader f0r;
-		FILE *f;
+	FILE *f;
+	char *line = NULL;
+	size_t linesize = 0;
+	ssize_t linelen;
 
-		f = fopen(fn, "r");
-		if (f == NULL)
-			err(2, NULL);
-
-		memset(&f0r, 0, sizeof(f0r));
-		f0r.f = f;
-
-		while (!feof(f)) {
-			char *line = read_file0_line(&f0r);
+	if (fn == NULL)
+		return;
 
-			if (line && *line) {
-				if (argc_from_file0 == (size_t)-1)
-					argc_from_file0 = 0;
-				++argc_from_file0;
-				argv_from_file0 = sort_realloc(argv_from_file0,
-				    argc_from_file0 * sizeof(char *));
-				if (argv_from_file0 == NULL)
-					err(2, NULL);
-				argv_from_file0[argc_from_file0 - 1] =
-				    sort_strdup(line);
-			}
+	f = fopen(fn, "r");
+	if (f == NULL)
+		err(2, "%s", fn);
+
+	while ((linelen = getdelim(&line, &linesize, '\0', f)) != -1) {
+		if (*line != '\0') {
+			if (argc_from_file0 == (size_t) - 1)
+				argc_from_file0 = 0;
+			++argc_from_file0;
+			argv_from_file0 = sort_realloc(argv_from_file0,
+			    argc_from_file0 * sizeof(char *));
+			if (argv_from_file0 == NULL)
+				err(2, NULL);
+			argv_from_file0[argc_from_file0 - 1] = line;
+		} else {
+			free(line);
 		}
-		closefile(f, fn);
+		line = NULL;
+		linesize = 0;
 	}
+	if (ferror(f))
+		err(2, "%s: getdelim", fn);
+
+	closefile(f, fn);
 }
 
 /*