Warning: This is the manual of the legacy Guile 2.0 series. You may want to read the manual of the current stable series instead.

6.6.6.2 Manipulating Bytevectors

Bytevectors can be created, copied, and analyzed with the following procedures and C functions.

Scheme Procedure: make-bytevector len [fill]

C Function: scm_make_bytevector (len, fill)

C Function: scm_c_make_bytevector (size_t len)

Return a new bytevector of len bytes. Optionally, if fill is given, fill it with fill; fill must be in the range [-128,255].

Scheme Procedure: bytevector? obj

C Function: scm_bytevector_p (obj)

Return true if obj is a bytevector.

C Function: int scm_is_bytevector (SCM obj)

Equivalent to scm_is_true (scm_bytevector_p (obj)).

Scheme Procedure: bytevector-length bv

C Function: scm_bytevector_length (bv)

Return the length in bytes of bytevector bv.

C Function: size_t scm_c_bytevector_length (SCM bv)

Likewise, return the length in bytes of bytevector bv.

Scheme Procedure: bytevector=? bv1 bv2

C Function: scm_bytevector_eq_p (bv1, bv2)

Return is bv1 equals to bv2—i.e., if they have the same length and contents.

Scheme Procedure: bytevector-fill! bv fill

C Function: scm_bytevector_fill_x (bv, fill)

Fill bytevector bv with fill, a byte.

Scheme Procedure: bytevector-copy! source source-start target target-start len

C Function: scm_bytevector_copy_x (source, source_start, target, target_start, len)

Copy len bytes from source into target, starting reading from source-start (a positive index within source) and start writing at target-start. It is permitted for the source and target regions to overlap.

Scheme Procedure: bytevector-copy bv

C Function: scm_bytevector_copy (bv)

Return a newly allocated copy of bv.

C Function: scm_t_uint8 scm_c_bytevector_ref (SCM bv, size_t index)

Return the byte at index in bytevector bv.

C Function: void scm_c_bytevector_set_x (SCM bv, size_t index, scm_t_uint8 value)

Set the byte at index in bv to value.

Low-level C macros are available. They do not perform any type-checking; as such they should be used with care.

C Macro: size_t SCM_BYTEVECTOR_LENGTH (bv)

Return the length in bytes of bytevector bv.

C Macro: signed char * SCM_BYTEVECTOR_CONTENTS (bv)

Return a pointer to the contents of bytevector bv.