Utils: Include stdint.h and fix signess in sdigits10().

Utils: added function to get radix 10 string length of signed integer.

Better memtoll() error checking.

Related to PR #2357.

The seed must be static in getRandomHexChars().

The seed must be static in getRandomHexChars().

counter must be static in getRandomHexChars().

getRandomHexChars(): use /dev/urandom just to seed.

On Darwin /dev/urandom depletes terribly fast. This is not an issue
normally, but with Redis Cluster we generate a lot of unique IDs, for
example

getRandomHexChars(): use /dev/urandom just to seed.

On Darwin /dev/urandom depletes terribly fast. This is not an issue
normally, but with Redis Cluster we generate a lot of unique IDs, for
example during nodes handshakes. Our IDs need just to be unique without
other strong crypto requirements, so this commit turns the function into
something that gets a 20 bytes seed from /dev/urandom, and produces the
rest of the output just using SHA1 in counter mode.

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Add simple ll2string() tests

Allow all code tests to run using Redis args

Previously, many files had individual main() functions for testing,
but each required being compiled with their own testing flags.
That gets difficult wh

Allow all code tests to run using Redis args

Previously, many files had individual main() functions for testing,
but each required being compiled with their own testing flags.
That gets difficult when you have 8 different flags you need
to set just to run all tests (plus, some test files required
other files to be compiled aaginst them, and it seems some didn't
build at all without including the rest of Redis).

Now all individual test main() funcions are renamed to a test
function for the file itself and one global REDIS_TEST define enables
testing across the entire codebase.

Tests can now be run with:
- `./redis-server test <test>`

e.g. ./redis-server test ziplist

If REDIS_TEST is not defined, then no tests get included and no
tests are included in the final redis-server binary.

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Clean up text throughout project

- Remove trailing newlines from redis.conf
- Fix comment misspelling
- Clarifies zipEncodeLength usage and a C API mention (#1243, #1242)
- Fix cluster typos

Clean up text throughout project

- Remove trailing newlines from redis.conf
- Fix comment misspelling
- Clarifies zipEncodeLength usage and a C API mention (#1243, #1242)
- Fix cluster typos (inspired by @papanikge #1507)
- Fix rewite -> rewrite in a few places (inspired by #682)

Closes #1243, #1242, #1507

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Fix undefined behavior in ll2string().

The bug was found by @CAFxX, thanks!
See issue #1940.

Fix util.c compilation by including stdint.h.

Faster ll2string() implementation.

Based on ideas documented in this blog post:

https://www.facebook.com/notes/facebook-engineering/three-optimization-tips-for-c/10151361643253920

The original cod

Faster ll2string() implementation.

Based on ideas documented in this blog post:

https://www.facebook.com/notes/facebook-engineering/three-optimization-tips-for-c/10151361643253920

The original code was modified to handle signed integers, reformetted to
fit inside the Redis code base, and was stress-tested with a program
in order to validate the implementation against snprintf().

Redis was measured to be measurably faster from the point of view of
clients in real-world operations because of this change, since sometimes
number to string conversion is used extensively (for example every time
a GET results into an integer encoded object to be returned to the
user).

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fix null pointer access with no file pointer

I happen to be working on a system that lacks urandom. While the code does try
to handle this case and artificially create some bytes if the file pointer

fix null pointer access with no file pointer

I happen to be working on a system that lacks urandom. While the code does try
to handle this case and artificially create some bytes if the file pointer is
empty, it does try to close it unconditionally, leading to a segfault.

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Ignore sdsrange return value.

pathIsBaseName() added to utils.c

The function is used to test that the specified string looks like just
as the basename of a path, without any absolute or relative path.

getAbsolutePath() moved into utils.c

BSD license added to every C source and header file.

Use correct variable name for value to convert.

Note by @antirez: this code was never compiled because utils.c lacked the
float.h include, so we never noticed this variable was mispelled in the
past

Use correct variable name for value to convert.

Note by @antirez: this code was never compiled because utils.c lacked the
float.h include, so we never noticed this variable was mispelled in the
past.

This should provide a noticeable speed boost when saving certain types
of databases with many sorted sets inside.

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clusterGetRandomName() generalized into getRandomHexChars() so that we can use it for the run_id field as well.

string2* functions take a const pointer

fmacros in utils.c to avoid warning about strcasecmp()

Extra tests for string2ll

Tests for string2ll; move isObject* to object.c

Fixed a problem with string2ll()