diff --git a/usr.bin/sort/file.c b/usr.bin/sort/file.c
index 92371d7a15b2..bfe5e5c29b86 100644
--- a/usr.bin/sort/file.c
+++ b/usr.bin/sort/file.c
@@ -62,26 +62,18 @@ const char *compress_program;
 
 size_t max_open_files = 16;
 
-/*
- * How much space we read from file at once
- */
-#define READ_CHUNK (4096)
-
 /*
  * File reader structure
  */
 struct file_reader
 {
-	struct reader_buffer	 rb;
 	FILE			*file;
 	char			*fname;
 	char			*buffer;
 	unsigned char		*mmapaddr;
 	unsigned char		*mmapptr;
 	size_t			 bsz;
-	size_t			 cbsz;
 	size_t			 mmapsize;
-	size_t			 strbeg;
 	int			 fd;
 	char			 elsymb;
 };
@@ -662,19 +654,6 @@ file_reader_init(const char *fsrc)
 		ret->file = openfile(fsrc, "r");
 		if (ret->file == NULL)
 			err(2, NULL);
-
-		if (strcmp(fsrc, "-")) {
-			ret->cbsz = READ_CHUNK;
-			ret->buffer = sort_malloc(ret->cbsz);
-			ret->bsz = 0;
-			ret->strbeg = 0;
-
-			ret->bsz = fread(ret->buffer, 1, ret->cbsz, ret->file);
-			if (ret->bsz == 0) {
-				if (ferror(ret->file))
-					err(2, NULL);
-			}
-		}
 	}
 
 	return (ret);
@@ -707,79 +686,6 @@ file_reader_readline(struct file_reader *fr)
 				fr->mmapptr = strend + 1;
 			}
 		}
-
-	} else if (fr->file != stdin) {
-		char *strend;
-		size_t bsz1, remsz, search_start;
-
-		search_start = 0;
-		remsz = 0;
-		strend = NULL;
-
-		if (fr->bsz > fr->strbeg)
-			remsz = fr->bsz - fr->strbeg;
-
-		/* line read cycle */
-		for (;;) {
-			if (remsz > search_start)
-				strend = memchr(fr->buffer + fr->strbeg +
-				    search_start, fr->elsymb, remsz -
-				    search_start);
-			else
-				strend = NULL;
-
-			if (strend)
-				break;
-			if (feof(fr->file))
-				break;
-
-			if (fr->bsz != fr->cbsz)
-				/* NOTREACHED */
-				err(2, "File read software error 1");
-
-			if (remsz > (READ_CHUNK >> 1)) {
-				search_start = fr->cbsz - fr->strbeg;
-				fr->cbsz += READ_CHUNK;
-				fr->buffer = sort_realloc(fr->buffer,
-				    fr->cbsz);
-				bsz1 = fread(fr->buffer + fr->bsz, 1,
-				    READ_CHUNK, fr->file);
-				if (bsz1 == 0) {
-					if (ferror(fr->file))
-						err(2, NULL);
-					break;
-				}
-				fr->bsz += bsz1;
-				remsz += bsz1;
-			} else {
-				if (remsz > 0 && fr->strbeg>0)
-					bcopy(fr->buffer + fr->strbeg,
-					    fr->buffer, remsz);
-
-				fr->strbeg = 0;
-				search_start = remsz;
-				bsz1 = fread(fr->buffer + remsz, 1,
-				    fr->cbsz - remsz, fr->file);
-				if (bsz1 == 0) {
-					if (ferror(fr->file))
-						err(2, NULL);
-					break;
-				}
-				fr->bsz = remsz + bsz1;
-				remsz = fr->bsz;
-			}
-		}
-
-		if (strend == NULL)
-			strend = fr->buffer + fr->bsz;
-
-		if ((fr->buffer + fr->strbeg <= strend) &&
-		    (fr->strbeg < fr->bsz) && (remsz>0))
-			ret = bwscsbdup(fr->buffer + fr->strbeg, strend -
-			    fr->buffer - fr->strbeg);
-
-		fr->strbeg = (strend - fr->buffer) + 1;
-
 	} else {
 		int delim = sort_opts_vals.zflag ? '\0' : '\n';
 		ssize_t len = getdelim(&fr->buffer, &fr->bsz, delim, fr->file);