[ipxe-devel] [ipxe/ipxe] Parse ${name:offset:length} in setting values (#95)

[Joe Groocock]

This emulates the bash `${varname:offset:length}` syntax allowing substring manipulation of settings values. It operates during the `fetchf_setting` stage so should work for show, echo and any form of setting substitution.

It extends the existing syntax like name:type:offset:length, e.g.

```
show smbios/product:string:0:8
show smbios/uuid::0:24
echo ${ifname::3:4}
```
You can view, comment on, or merge this pull request online at:

  https://github.com/ipxe/ipxe/pull/95

-- Commit Summary --

  * Parse ${name:offset:length} in setting values

-- File Changes --

    M src/core/settings.c (112)
    M src/include/ipxe/settings.h (6)

-- Patch Links --

https://github.com/ipxe/ipxe/pull/95.patch
https://github.com/ipxe/ipxe/pull/95.diff

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