(determine_real_coding_system): Check by nread instead of 4096.

diff --git a/src/file-coding.c b/src/file-coding.c
index 9dd0922..9d3afe7 100644 (file)
--- a/src/file-coding.c
+++ b/src/file-coding.c
@@ -1629,25 +1629,25 @@ determine_real_coding_system (Lstream *stream, Lisp_Object *codesys_in_out,
        {
          unsigned char *cp = random_buffer;
 
-         while (cp < random_buffer + 4096)
+         while (cp < random_buffer + nread)
            {
-             if ((*cp++ == 'c') && (cp < random_buffer + 4096) &&
-                 (*cp++ == 'o') && (cp < random_buffer + 4096) &&
-                 (*cp++ == 'd') && (cp < random_buffer + 4096) &&
-                 (*cp++ == 'i') && (cp < random_buffer + 4096) &&
-                 (*cp++ == 'n') && (cp < random_buffer + 4096) &&
-                 (*cp++ == 'g') && (cp < random_buffer + 4096) &&
-                 (*cp++ == ':') && (cp < random_buffer + 4096))
+             if ((*cp++ == 'c') && (cp < random_buffer + nread) &&
+                 (*cp++ == 'o') && (cp < random_buffer + nread) &&
+                 (*cp++ == 'd') && (cp < random_buffer + nread) &&
+                 (*cp++ == 'i') && (cp < random_buffer + nread) &&
+                 (*cp++ == 'n') && (cp < random_buffer + nread) &&
+                 (*cp++ == 'g') && (cp < random_buffer + nread) &&
+                 (*cp++ == ':') && (cp < random_buffer + nread))
                {
                  unsigned char coding_system_name[4096 - 6];
                  unsigned char *np = coding_system_name;
 
-                 while ( (cp < random_buffer + 4096)
+                 while ( (cp < random_buffer + nread)
                          && ((*cp == ' ') || (*cp == '\t')) )
                    {
                      cp++;
                    }
-                 while ( (cp < random_buffer + 4096) &&
+                 while ( (cp < random_buffer + nread) &&
                          (*cp != ' ') && (*cp != '\t') && (*cp != ';') )
                    {
                      *np++ = *cp++;