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authorHendrik Leppkes <h.leppkes@gmail.com>2012-09-14 12:45:34 -0400
committerDerek Buitenhuis <derek.buitenhuis@gmail.com>2012-09-15 19:49:34 -0400
commite3a1eb9edf65edda301f3a727f11e0224b9f5ae2 (patch)
tree8e44a00c97ec69e428d20160e877e6fa75f53b52 /doc/developer.texi
parentd512e74dec756787417b72776eece32466552724 (diff)
downloadffmpeg-e3a1eb9edf65edda301f3a727f11e0224b9f5ae2.tar.gz
af_pan: Fix sscanf formats to work with buggy sscanf implementations
Some implementations of sscanf do not handle a space before a trailing %n properly. As an example, MSVC's does this for the second insatnce in this patch, for an input of "0x3:c0=c1:c1=c0": 1) Match the final "c0" or "c1". 2) Realize it's at the end of the string. 3) Check for %n. 4) There is no %n, but a space instead. 5) Leave 'len' unitilialized. So, move it out of the sscanf format strings, and call skip_spaces instead. This bug does not affect skip_spaces since %n is the first and only formatting string. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
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