vendor/flex/2.5.37

1 files changed, 20 insertions, 5 deletions

diff --git a/buf.c b/buf.c
index 33a5a9f0b2b3a..e5deb4e81c3a7 100644
--- a/buf.c
+++ b/buf.c
@@ -74,6 +74,8 @@ struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
         size_t tsz;
 
 	t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1);
+	if (!t)
+	    flexfatal (_("Allocation of buffer to print string failed"));
 	snprintf (t, tsz, fmt, s);
 	buf = buf_strappend (buf, t);
 	flex_free (t);
@@ -88,11 +90,20 @@ struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
  */
 struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
 {
-    char   *t, *fmt = "#line %d \"%s\"\n";
-    size_t tsz;
-    
-    t = flex_alloc (tsz = strlen (fmt) + strlen (filename) + (int)(1 + log10(lineno>=0?lineno:-lineno)) + 1);
-    snprintf (t, tsz, fmt, lineno, filename);
+    char *dst, *src, *t;
+
+    t = flex_alloc (strlen ("#line \"\"\n")          +   /* constant parts */
+                    2 * strlen (filename)            +   /* filename with possibly all backslashes escaped */
+                    (int) (1 + log10 (abs (lineno))) +   /* line number */
+                    1);                                  /* NUL */
+    if (!t)
+      flexfatal (_("Allocation of buffer for line directive failed"));
+    for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
+      if (*src == '\\')   /* escape backslashes */
+        *dst++ = '\\';
+    *dst++ = '"';
+    *dst++ = '\n';
+    *dst   = '\0';
     buf = buf_strappend (buf, t);
     flex_free (t);
     return buf;
@@ -162,6 +173,8 @@ struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val)
 
     val = val?val:"";
     str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2);
+    if (!str)
+        flexfatal (_("Allocation of buffer for m4 def failed"));
 
     snprintf(str, strsz, fmt, def, val);
     buf_append(buf, &str, 1);
@@ -180,6 +193,8 @@ struct Buf *buf_m4_undefine (struct Buf *buf, const char* def)
     size_t strsz;
 
     str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2);
+    if (!str)
+        flexfatal (_("Allocation of buffer for m4 undef failed"));
 
     snprintf(str, strsz, fmt, def);
     buf_append(buf, &str, 1);