104 lines
1.7 KiB
C
104 lines
1.7 KiB
C
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/**
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* @file sprintf.h
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* @brief Library for sprintf() function.
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* @author Miguel I. Garcia Lopez / FloppySoftware
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*
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* Implementation of sprintf() function, for MESCC (Mike's Enhanced
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* Small C Compiler for Z80 & CP/M).
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*
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* Revisions:
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* - 20 Oct 2000 : Last revision.
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* - 16 Apr 2007 : GPL'd.
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* - 14 Apr 2015 : Ammended a bad closed comment.
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* - 25 Aug 2016 : Documented. GPL v3.
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*
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* Copyright (c) 1999-2016 Miguel I. Garcia Lopez / FloppySoftware.
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*
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* Licensed under the GNU General Public License v3.
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*
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* http://www.floppysoftware.es
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* floppysoftware@gmail.com
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*/
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#ifndef SPRINTF_H
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#define SPRINTF_H
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// Dependencies
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// ------------
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#ifndef XPRINTF_H
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#include <xprintf.h>
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#endif
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/**
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* @fn int sprintf(char *dst, char *fmt, arg1, arg2, ...)
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* @brief Formatted output to memory.
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*
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* See the documentation for xprintf.h to learn about the string format.
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*
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* @param dst - destination
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* @param fmt - string format
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* @param arg1 - argument #1
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* @param arg? - argument #?
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* @return number or characters written, or -1 on failure (currently always #).
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*/
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#asm
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sprintf:
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ADD HL,HL
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ADD HL,SP ;HL=Adr. fmt
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LD DE,xspfout
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PUSH DE
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LD DE,xspfend
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PUSH DE
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PUSH HL
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INC HL
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INC HL ;HL=Adr. dst
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LD A,(HL)
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INC HL
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LD H,(HL)
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LD L,A
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LD (xspfout+2),HL
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CALL xprintf
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POP BC
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POP BC
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POP BC
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RET
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#endasm
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// int xspfout(char ch) : output ch to memory; return 0 on success, !=0 on failure (currently always returns 0).
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#asm
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xspfout:
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LD A,L
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LD HL,0 ;Adr.
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LD (HL),A
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INC HL
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LD (xspfout+2),HL
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LD HL,0
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RET
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#endasm
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// void xspfend(void) : end formatted output; writes a trailing zero byte.
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#asm
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xspfend:
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LD HL,(xspfout+2)
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LD (HL),0
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RET
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#endasm
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#endif
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