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Happy Numbers (Long)

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A happy number is defined by the following Sequence: Starting with any positive integer, replace the number by the sum of the squares of its digits in base-ten, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are sad numbers.

For example, 19 is happy, as the associated Sequence is:

12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1.

Print all the happy numbers from 1 to 1,000 inclusive, each on their own line.

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Compiled from AT&T syntax to x86-64 Linux. Use syscalls to write output.
Top-level programs are supported, args holds ARGV. Implicit using directives for console applications are enabled.
Arguments are available via STDIN, each argument is NULL terminated. Taking input after EOF leaves the cell unchanged, the tape is circular with 65536 cells, and cells are 8-bit with wrapping.
Code is compiled with clang with -std=c++2b.
Code is compiled with LDC2.
Arguments are available via STDIN, each argument is NULL terminated. x is a no-op.
The stack is initialized with an array containing arguments, rather than the contents of STDIN.
Arguments are available via STDIN, each argument is NULL terminated.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
Code is run under -E, all current features are enabled.
$args to access the arguments.
prolog_flag(argv, Args) to access the arguments.
Arguments are available via STDIN, each argument is seperated with a null byte. The code is run with -E and -z. Output replaces null bytes with newlines.
SELECT arg FROM argv to access the arguments, only the first column of the first result set will be printed, NULL values will be skipped, and the dialect is SQLite.
Arguments are available via args list variable. To terminate script execution, write and quit the current buffer.
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