Fixes to SYS_READ changes in PR #727 per review. (#729)#1
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donmr merged 1 commit intodonmr:masterfrom Jul 28, 2018
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* Use local variable for read_result instead of *ret, and fix calculation of *ret for EOF case. * Found a problem when reading an odd (%4) number of bytes at the end of a file. fread (on stm32) get them (say 3 bytes), then askes for more. do_semihosting gets a read return of 0 and tries to write that. mem_write alters the address to be aligned and overwrites then 3 bytes from the last read. This change simply tells mem_write to do nothing if len is 0. * Fix Issues from Fabien-Chouteau's review of my previous patch in isue #727. * Revert change to mem_write() so it does not confuse fixes to do_semihosting(). * Add cast to avoid warning.
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Use local variable for read_result instead of *ret, and fix
calculation of *ret for EOF case.
Found a problem when reading an odd (%4) number of bytes at the end
of a file. fread (on stm32) get them (say 3 bytes), then askes for
more. do_semihosting gets a read return of 0 and tries to write that.
mem_write alters the address to be aligned and overwrites then 3 bytes
from the last read.
This change simply tells mem_write to do nothing if len is 0.
Fix Issues from Fabien-Chouteau's review of my previous patch in isue For Issue 726, Semihost SYS_READ returns incorrect value on EOF stlink-org/stlink#727.
Revert change to mem_write() so it does not confuse fixes to do_semihosting().
Add cast to avoid warning.