The delimited-I/O module can be accessed with:
(use-modules (ice-9 rdelim))
It can be used to read or write lines of text, or read text delimited by
a specified set of characters. It's similar to the
module from guile-scsh, but does not use multiple values or character
sets and has an extra procedure
Return a line of text from port if specified, otherwise from the value returned by
(current-input-port). Under Unix, a line of text is terminated by the first end-of-line character or by end-of-file.
If handle-delim is specified, it should be one of the following symbols:
- Discard the terminating delimiter. This is the default, but it will be impossible to tell whether the read terminated with a delimiter or end-of-file.
- Append the terminating delimiter (if any) to the returned string.
- Push the terminating delimiter (if any) back on to the port.
- Return a pair containing the string read from the port and the terminating delimiter or end-of-file object.
Read a line of text into the supplied string buf and return the number of characters added to buf. If buf is filled, then
#fis returned. Read from port if specified, otherwise from the value returned by
Read text until one of the characters in the string delims is found or end-of-file is reached. Read from port if supplied, otherwise from the value returned by
(current-input-port). handle-delim takes the same values as described for
Read text into the supplied string buf and return the number of characters added to buf (subject to handle-delim, which takes the same values specified for
read-line. If buf is filled,
#fis returned for both the number of characters read and the delimiter. Also terminates if one of the characters in the string delims is found or end-of-file is reached. Read from port if supplied, otherwise from the value returned by
Display obj and a newline character to port. If port is not specified,
(current-output-port)is used. This function is equivalent to:(display obj [port]) (newline [port])
Some of the abovementioned I/O functions rely on the following C primitives. These will mainly be of interest to people hacking Guile internals.
Read characters from port into str until one of the characters in the delims string is encountered. If gobble is true, discard the delimiter character; otherwise, leave it in the input stream for the next read. If port is not specified, use the value of
(current-input-port). If start or end are specified, store data only into the substring of str bounded by start and end (which default to the beginning and end of the string, respectively).
Return a pair consisting of the delimiter that terminated the string and the number of characters read. If reading stopped at the end of file, the delimiter returned is the eof-object; if the string was filled without encountering a delimiter, this value is
Read a newline-terminated line from port, allocating storage as necessary. The newline terminator (if any) is removed from the string, and a pair consisting of the line and its delimiter is returned. The delimiter may be either a newline or the eof-object; if
%read-lineis called at the end of file, it returns the pair
(#<eof> . #<eof>).