StackOverflow2013

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primarykey
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18250638
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2013-08-15T10:16:39.350
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2013-08-15T10:42:05.440
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2013-08-15T10:42:05.440
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text
Body
I presume you know what the code is supposed to do. The function has a very <a href="http://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string_search_algorithm" rel="nofollow">evocative</a> <a href="http://en.wikipedia.org/wiki/Boyer-Moore-Horspool_algorithm" rel="nofollow">name</a>. So, addressing the queries in code directly, without analysing the code too much (it's incomplete): <code>search</code> is a pointer. Not the string itself, but a pointer to that string. One might expect <code>string</code> to be pointing the start of some string, and <code>search</code> is set to point to the same value. <code>skipTable[*search++] = i;</code> dereferences the pointer, obtaining the value at whatever <code>search</code> was pointing at, and then increments the pointer. Since <code>skipTable</code> is an array of 255 ints and <code>search</code> is a char pointer, this will never fall out of bounds on x86 if a char is unsigned (compiler dependent). Really, there should be a cast; <code>skipTable[(unsigned char) *search++]</code>. (strictly speaking, this still isn't portable). So <code>i</code> is set to the value at <code>skipTable[*search]</code> and <code>search</code> (which is a pointer) is incremented (presumably to point to the next value in some array). <code>lastChar = *--search;</code> is similar to before. <code>search</code> is decremented and then dereferenced. So this gets the previous value in the string. <code>search += (strLength - i + 1);</code> again, a pointer is being increased. If <code>strLength</code> represents the length of a string As has been pointed in out in comments, the following is not a good idea: <code>char *data ="nice bad good worst";</code> The string you've defined in code cannot be modified, but because you have a pointer to it, you're allowed to try. The result of trying to modify the string pointed to be <code>data</code> is undefined, but will almost invariably result in a crash.
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1. POUnderstanding c programming data structure
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