LibBSD | Symbol expansion problem in strxxx function (#10)

[Doreamon 66 (@doraemon)]

Doreamon 66 created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/10



## Summary
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When testing the rcconf01 example in aarch64 mode with cpu memory in the range 0x80000000-0x90000000, since rtems-bsd-rc-conf.c does not include string.h, This causes symbol extension problems when calling functions such as strdup and strchr, which can cause system crashes.

This problem also exists in rtemsbsd/ftpd/ftpd-service.c and rtemsbsd/rtems/rtems-routes.c.

![image](/uploads/2d3dc6594884532506b69f59d9bc8719/image.png)

## Steps to reproduce

Aarch64 mode, cpu memory in the range 0x80000000-0x90000000, run rtems-libbsd/testsuite/rcconf01/test_main.c example.

## Steps to resolve

Add `#include <string.h>` in these files.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/10
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