open_file, close_file, get_line

open_file("filename")

:: Opens filename for reading.

close_file(num)

:: Closes the file indicated by a descriptor num.

get_line(num)

:: Reads a line from the file indicated by a descriptor num.

return

open_file() : integer (fild id); close_file() : 1; get_line() : string

filename

file (path) name

num

non-negative integer (file descriptor)

• open_file() opens a file for reading. If successful, it returns a non-negative integer as the file descriptor. Otherwise the system error function is called. Unnecessary files should be closed by close_file().
• get_line() reads a line from an opened file and returns the line as a string.
• A get_line() call after reading the end of file returns an integer 0.
• Strings can be converted into internal forms with string manipulation functions such as sub_str(), eval_str().

[185] Id = open_file("test");
0
[186] get_line(Id);
12345

[187] get_line(Id);
67890

[188] get_line(Id);
0
[189] type(@@);
0

References

section eval_str, section str_len, str_chr, sub_str.

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