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Problem with msdos86 and msdos386 targets #365
Description
Activity
It looks like "rb" is broken:
test.c:#include <stdio.h> int main(void) { FILE * fp1 = fopen ("test.c", "r"); FILE * fp2 = fopen ("test.c", "rb"); printf (" r=%d\n", fgetc (fp1)); printf ("rb=%d\n", fgetc (fp2)); return 0; }
- Result:
$ /opt/ack/bin/ack -mmsdos86 -O3 test.c -o test.com $ emu2 test.com r=35 rb=-1
@davidgiven I fixed it - PR coming.
@davidgiven #366 fixes the problem - binary mode file I/O was broken, it was always returning EOF and never what was read.
- added a commit that references this issue
on Jul 15, 2026
See https://github.com/johnsonjh/pcdos-crc (or https://GitLab.com/dps8m/crc).
This program currently works on over 50 different compilers on nearly 30 tested platforms, however, Ack targeting msdos86/msdos386 does not work, it seems to miscompile somehow and always shows a 0 CRC.
I didn’t investigate much further, however the UNIX V7 and CP/M-80 Ack builds have been fully tested and work correctly.