Mercurial > vim
diff runtime/doc/builtin.txt @ 30922:ed6acfafa17e v9.0.0795
patch 9.0.0795: readblob() always reads the whole file
Commit: https://github.com/vim/vim/commit/11df3aeee548b959ccd4b9a4d3c44651eab6b3ce
Author: K.Takata <kentkt@csc.jp>
Date: Wed Oct 19 14:02:40 2022 +0100
patch 9.0.0795: readblob() always reads the whole file
Problem: readblob() always reads the whole file.
Solution: Add arguments to read part of the file. (Ken Takata,
closes #11402)
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Wed, 19 Oct 2022 15:15:05 +0200 |
| parents | 3295247d97a5 |
| children | 84f6f91ca02a |
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--- a/runtime/doc/builtin.txt +++ b/runtime/doc/builtin.txt @@ -445,7 +445,8 @@ pyxeval({expr}) any evaluate |python_x rand([{expr}]) Number get pseudo-random number range({expr} [, {max} [, {stride}]]) List items from {expr} to {max} -readblob({fname}) Blob read a |Blob| from {fname} +readblob({fname} [, {offset} [, {size}]]) + Blob read a |Blob| from {fname} readdir({dir} [, {expr} [, {dict}]]) List file names in {dir} selected by {expr} readdirex({dir} [, {expr} [, {dict}]]) @@ -6847,10 +6848,21 @@ range({expr} [, {max} [, {stride}]]) GetExpr()->range() < -readblob({fname}) *readblob()* +readblob({fname} [, {offset} [, {size}]]) *readblob()* Read file {fname} in binary mode and return a |Blob|. + If {offset} is specified, read the file from the specified + offset. If it is a negative value, it is used as an offset + from the end of the file. E.g., to read the last 12 bytes: > + readblob('file.bin', -12) +< If {size} is specified, only the specified size will be read. + E.g. to read the first 100 bytes of a file: > + readblob('file.bin', 0, 100) +< If {size} is -1 or omitted, the whole data starting from + {offset} will be read. When the file can't be opened an error message is given and the result is an empty |Blob|. + When trying to read bytes beyond the end of the file the + result is an empty blob. Also see |readfile()| and |writefile()|.