Hello,
I was running my application which uses SQLite in debug mode, and I noticed some very bizarre behaviour in this function:
The character in question was the pound sign ('£') whose value the debugger said was -93 (the watch window however said 163). It seems that inside my implementation of islower, it does the following assertion:
Sounds like chars in your environment are signed by default. This means that any char that you expect to be between 128 and 255 reads as -128 to -1 instead. This often doesn't matter if you are just writing the char back to memory but if you try and pass it to an OS routine like toupper() or cast it to unsigned as you do then you'll get incorrect results.
Your choices are to either change your compile settings so that chars are unsigned by default (probably safest) or to change your code to explicitly use unsigned chars, declare z as 'unsigned char *z'.
Hope this helps.
--
Simon Middleton, Senior Software Engineer
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TI integrates ANT Galio for advanced digital TV applications www.antlimited.com/news/2005-01-05-ti-ces.htm
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