Return NULL if EOF is encountered before terminating_string.

1 files changed, 7 insertions, 10 deletions

diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c
index 33d8d00cc..4943464d5 100644
--- a/libbb/fgets_str.c
+++ b/libbb/fgets_str.c
@@ -19,11 +19,10 @@
 #include <stdlib.h>
 #include <string.h>
 
-/*
- * Continue reading from file until the terminating string is encountered.
- * Return data as string.
- * e.g. fgets_str(file, "\n"); will read till end of file
- */
+#include "libbb.h"
+
+/* Read up to (and including) TERMINATING_STRING from FILE and return it.
+ * Return NULL on EOF.  */
 
 char *fgets_str(FILE *file, const char *terminating_string)
 {
@@ -37,12 +36,13 @@ char *fgets_str(FILE *file, const char *terminating_string)
         while (1) {
                 ch = fgetc(file);
                 if (ch == EOF) {
-                        break;
+                        free(linebuf);
+                        return NULL;
                 }
 
                 /* grow the line buffer as necessary */
                 while (idx > linebufsz - 2) {
-                        linebuf = realloc(linebuf, linebufsz += 1000); /* GROWBY */
+                        linebuf = xrealloc(linebuf, linebufsz += 1000);
                 }
 
                 linebuf[idx] = ch;
@@ -55,9 +55,6 @@ char *fgets_str(FILE *file, const char *terminating_string)
                         break;
                 }
         }
-        if (idx == 0) {
-                return NULL;
-        }
         linebuf[idx] = '\0';
         return(linebuf);
 }