1 files changed, 23 insertions, 0 deletions

diff --git a/common/readline.c b/common/readline.c
index ed5801de..1c396a90 100644
--- a/common/readline.c
+++ b/common/readline.c
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 200809L
 #include "readline.h"
 #include "log.h"
 #include <stdlib.h>
@@ -48,6 +49,28 @@ char *read_line(FILE *file) {
         return string;
 }
 
+char *peek_line(FILE *file, int line_offset, long *position) {
+        long pos = ftell(file);
+        size_t length = 0;
+        char *line = NULL;
+        for (int i = 0; i <= line_offset; i++) {
+                ssize_t read = getline(&line, &length, file);
+                if (read < 0) {
+                        free(line);
+                        line = NULL;
+                        break;
+                }
+                if (read > 0 && line[read - 1] == '\n') {
+                        line[read - 1] = '\0';
+                }
+        }
+        if (position) {
+                *position = ftell(file);
+        }
+        fseek(file, pos, SEEK_SET);
+        return line;
+}
+
 char *read_line_buffer(FILE *file, char *string, size_t string_len) {
         size_t length = 0;
         if (!string) {