sources: update source headers

All C and H files now (should) feature the proper project curl source
code header, which includes basic info, a copyright statement and some
basic disc

sources: update source headers

All C and H files now (should) feature the proper project curl source
code header, which includes basic info, a copyright statement and some
basic disclaimers.

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remove the CVSish $Id$ lines

removed trailing whitespace

Addes OOM handling for curl_easy_setopt() calls in test

include "memdebug.h"

Made sure to pass longs in to curl_easy_setopt where necessary in the
libtest code.

Don't abort tests 518 and 537 when unable to raise the open-file soft limit

Fix missing right parenthesis

Fix comparison between signed and unsigned

unify fopen() failure error message among tests, allowing
the testsuite to count them as errors of the same kind

add debug message and expand comment

test can be allowed to run if fopen() is capable of fopen()ing
three additional files once that we have already open()ed the
big bunch of file descriptors.

cleanup

test can be allowed to run if fopen() is capable of fopen()ing
SAFETY_MARGIN additional files once that we have already open()ed
the big bunch of file descriptors.

Verify if the test is limited by an ancient stdio with a 256
open file limit. In this case the test is skipped with a
message showing this limitation when the number of open files
needed

Verify if the test is limited by an ancient stdio with a 256
open file limit. In this case the test is skipped with a
message showing this limitation when the number of open files
needed for the test is greater than 256.

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use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling

when using select() instead of poll, skip the test if the number of
open file descriptors is greater than FD_SETSIZE minus SAFETY_MARGIN,
also skip the test if any of the open file descriptor

when using select() instead of poll, skip the test if the number of
open file descriptors is greater than FD_SETSIZE minus SAFETY_MARGIN,
also skip the test if any of the open file descriptors has a number
greater than FD_SETSIZE minus SAFETY_MARGIN.

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skip test on platforms on which we use select() instead
of poll() and select() happens to be bound by FD_SETSIZE

Compiler warning fix

add a couple more of debugging messages

reduce max size of dinamically allocated arrays to minimize the nasty
behaviour some versions of IRIX exhibit of committing suicide on big
mallocs instead of just returning a friendly null po

reduce max size of dinamically allocated arrays to minimize the nasty
behaviour some versions of IRIX exhibit of committing suicide on big
mallocs instead of just returning a friendly null pointer

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fix comments and renumber rlimit return codes

update and split test cases 518 and 537 into its own source code file

code cleanup

use our internal string functions and replace sprintf with snprintf