summaryrefslogtreecommitdiffhomepage
path: root/tests/custom/02_runtime/00_scoping
diff options
context:
space:
mode:
authorJo-Philipp Wich <jo@mein.io>2022-01-24 18:14:36 +0100
committerJo-Philipp Wich <jo@mein.io>2022-01-24 22:10:17 +0100
commita1b3c5dfbe0aaf46d3d71656e65d72526bfa5543 (patch)
tree22a01f1f8350ae65eff996cd504fdf5e11fb5105 /tests/custom/02_runtime/00_scoping
parentb2fac62699687368559af06487338f282e30c723 (diff)
struct: implement `*` format, fix invalid memory accesses
Implement a new `*` format which acts like `s` on unpack but accepts input records which are shorter than the specified length, e.g. the following call will yield "abc" while an equivalent "10s" format would fail: unpack("2*", "abc") // [ "ab" ] unpack("10*", "abc") // [ "abc" ] unpack("10s", "abc") // null The `*` format is primarily useful to extract the remainder of a variable length record without having to encode the specific length of the record directly into the format string. When packing records, the `*` format takes at most as many bytes as specified in the format string repeat count. If the input string is shorter than the given repeat count, only as many bytes as present in the input string are taken. A bare `*` without any repeat count will take all bytes from the given input string: pack("2*", "abc") // "ab" pack("10*", "abc") // "abc" pack("*", "abc") // "abc" pack("10s", "abc") // "abc\0\0\0\0\0\0\0" Additionally prevent invalid memory accesses when unpacking a buffer shorter than the length expected by the format string. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Diffstat (limited to 'tests/custom/02_runtime/00_scoping')
0 files changed, 0 insertions, 0 deletions