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regression in scanf #6791

vicuna opened this issue Feb 23, 2015 · 2 comments


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commented Feb 23, 2015

Original bug ID: 6791
Reporter: milanst
Assigned to: @gasche
Status: closed (set by @xavierleroy on 2016-12-07T10:47:17Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.02.1
Category: standard library
Monitored by: @hcarty

Bug description

There is a scanf regression where @c doesn't stop scanning for every character 'c'. In particular, it seems it is broken when character is a valid format specifier.

Steps to reproduce

utop # Scanf.sscanf "some-thing{1..3}" "%s@{%d..%d}" (fun s n1 n2 -> s,n1,n2);;
Exception: End_of_file.

But this works:
utop # Scanf.sscanf "some-thingI{1..3}" "%s@I{%d..%d}" (fun s n1 n2 ->

  • : bytes * int * int = ("some-thing", 1, 3)

I haven't tried but apparently both work fine in 4.01.

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commented Feb 23, 2015

Comment author: @gasche

Benoît Vaugon wrote a patch to fix this, I'll upload it here for reference. It looks good, I'd like a testsuite occurence of the issue, which I will probably add when the patch is merged.


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commented Mar 7, 2015

Comment author: @gasche

Merged in trunk and 4.02.

@vicuna vicuna closed this Dec 7, 2016

@vicuna vicuna added the stdlib label Mar 14, 2019

@vicuna vicuna added the bug label Mar 20, 2019

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