0002599: libsvgtiny uses sscanf() to parse decimal fractions in path data, which is locale-dependent

MantisBT - LibSVGTiny
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ID	Project	Category	View Status	Date Submitted	Last Update
0002599	LibSVGTiny	[All Projects] General	public	2018-05-11 06:36	2019-02-17 10:30

Reporter	Felix S.
Assigned To	Michael Drake
Priority	normal	Severity	minor	Reproducibility	always
Status	confirmed	Resolution	open
Platform		OS		OS Version
Fixed in CI build #
Reported in CI build #

Summary	0002599: libsvgtiny uses sscanf() to parse decimal fractions in path data, which is locale-dependent
Description	libsvgtiny uses the C standard library function sscanf() to parse decimal fractions into floating-point values. Unfortunately, the exact format accepted by this function is locale-dependent. This makes parsing fail in locales where the decimal point character is different from '.'. Given that sscanf() does not offer a portable way to enforce locale-independent parsing, libsvgtiny should probably implement its own fraction-parsing function from scratch.
Steps To Reproduce	0. Ensure that the de_DE.UTF-8 locale (or any other locale with decimal point ',') is available on your system. 1. In libsvgtiny's test/data/ directory, launch `LC_NUMERIC=de_DE.UTF-8 netsurf-fb file://`pwd`/tiger.svg` from the shell (replacing de_DE.UTF-8 with the respective locale if necessary). 2. Observe numerous 'parse failed at ...' messages in the console. 3. In the same directory, launch `LC_NUMERIC=C netsurf-fb file://`pwd`/tiger.svg`. 4. Observe no failure messages.
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