65C816 SW: printf() family functions
Posted: Fri Apr 05, 2019 2:52 pm
Hello,
i'm developing a "c-like" printf() family function, in assembler, for the 65c816 uP.
Six function are in develop here:
1) cprintf(lpFmt, ..., wCount) - format parameters basis the format string and print on console
2) tprintf(lpFmt, ..., wCount) - print on default text device (useful for monitor, to redirect console)
3) printf(lpFmt, ..., wCount) - print to standard out device
4) dprintf(bHandle, lpFmt, ..., wCount) - send output to an open file handle
5) fprintf(lpStream, lpFmt, ..., wCount) - send output to an open file stream
6) snprintf(lpBuf, wSize, lpFmt, ..., wCount) - format to an user buffer
For now just cprintf() and snprintf() are fully implemented: the Others functions requires the right system calls to write a buffer to a file handle or file stream, a section that is under develop.
All functions accept a variable number of parameters, passed on stack by the caller. For an explanation about format and the method to manage a variable number of parameters on stack look at source code PRINTF.ASM on my web site:
http://65xx.unet.bz/c16sw/index.php
where also i put a revisioned source code for float point unit and for strings.
Functions on printf.asm and strings.asm are intended to be a "static library" that be used both by assembler or by an high Language like c; all are declared in fact as "pascal": parameters on stack are pushed by the caller in left-to-right order and stack cleanup is managed by functions itselfs.
Marco
i'm developing a "c-like" printf() family function, in assembler, for the 65c816 uP.
Six function are in develop here:
1) cprintf(lpFmt, ..., wCount) - format parameters basis the format string and print on console
2) tprintf(lpFmt, ..., wCount) - print on default text device (useful for monitor, to redirect console)
3) printf(lpFmt, ..., wCount) - print to standard out device
4) dprintf(bHandle, lpFmt, ..., wCount) - send output to an open file handle
5) fprintf(lpStream, lpFmt, ..., wCount) - send output to an open file stream
6) snprintf(lpBuf, wSize, lpFmt, ..., wCount) - format to an user buffer
For now just cprintf() and snprintf() are fully implemented: the Others functions requires the right system calls to write a buffer to a file handle or file stream, a section that is under develop.
All functions accept a variable number of parameters, passed on stack by the caller. For an explanation about format and the method to manage a variable number of parameters on stack look at source code PRINTF.ASM on my web site:
http://65xx.unet.bz/c16sw/index.php
where also i put a revisioned source code for float point unit and for strings.
Functions on printf.asm and strings.asm are intended to be a "static library" that be used both by assembler or by an high Language like c; all are declared in fact as "pascal": parameters on stack are pushed by the caller in left-to-right order and stack cleanup is managed by functions itselfs.
Marco