[segyio] 263/376: Return early on successive calls to segy_mmap

[Jørgen Kvalsvik]

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jokva-guest pushed a commit to branch debian
in repository segyio.

commit 7e31935e31652fc28d382af03f78fb82e2684dec
Author: Jørgen Kvalsvik <jokva at statoil.com>
Date:   Wed Mar 29 13:43:37 2017 +0200

    Return early on successive calls to segy_mmap
---
 lib/src/segy.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/src/segy.c b/lib/src/segy.c
index 4d482c3..07d693f 100644
--- a/lib/src/segy.c
+++ b/lib/src/segy.c
@@ -353,6 +353,9 @@ int segy_mmap( segy_file* fp ) {
     return SEGY_MMAP_INVALID;
 #else
 
+    /* don't re-map; i.e. multiple consecutive calls should be no-ops */
+    if( fp->addr ) return SEGY_OK;
+
     long long fsize;
     int err = file_size( fp->fp, &fsize );
 

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