131 lines
2.2 KiB
C
131 lines
2.2 KiB
C
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/*
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Directory Access Library
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FIND.C taken from DIRLIB.C by M. J. Weinstein
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Released to public domain 1-Jan-89
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The author may be contacted at:
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matt@cs.ucla.edu -or- POB 84524, L.A., CA 90073
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Modified by dvadura@watdragon.edu to work with dmake.
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(nuked the DOS version 2 code, since dmake needs version
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3.0 or greater to function).
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*/
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/*
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* revision history:
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*
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* VER MM/DD/YY COMMENTS
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* ---- -------- --------
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* 0.99 02/24/86 Beta release to INTERNET
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <alloc.h>
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#include <dos.h>
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#include "dosdta.h"
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#ifndef MK_FP
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#define MK_FP(seg,ofs) ((void far *) \
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(((unsigned long)(seg) << 16) | (unsigned)(ofs)))
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#endif
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#ifndef FP_SEG
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#define FP_SEG(fp) ((unsigned)((unsigned long)(fp) >> 16))
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#endif
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#ifndef FP_OFF
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#define FP_OFF(fp) ((unsigned)(fp))
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#endif
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int find_err;
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/*
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* get/set dta address
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*/
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static DTA far *
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_getsetdta(newdta)
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DTA far *newdta;
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{
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DTA far *olddta;
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union REGS r;
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struct SREGS s;
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/* get old dta */
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r.h.ah = 0x2f;
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intdos(&r, &r);
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segread(&s);
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olddta = (DTA far *) MK_FP(s.es, r.x.bx);
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/* conditionally set new dta */
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if (newdta) {
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r.h.ah = 0x1a;
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s.ds = FP_SEG(newdta);
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r.x.dx = FP_OFF(newdta);
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intdosx(&r, &r, &s);
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}
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return olddta;
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}
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/*
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* dos findfirst
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*/
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DTA *
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findfirst(name, dta)
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char *name;
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DTA *dta;
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{
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union REGS r;
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struct SREGS s;
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DTA far *dtasave;
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char far *nmp = (char far *)name;
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dtasave = _getsetdta((DTA far *)dta);
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/* do directory lookup */
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segread(&s);
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r.h.ah = 0x4e;
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r.x.cx = 0x10;
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r.x.dx = FP_OFF(nmp);
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s.ds = FP_SEG(nmp);
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intdosx(&r, &r, &s);
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/* restore dta */
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_getsetdta(dtasave);
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find_err = r.x.ax;
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if (r.x.cflag)
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return(NULL);
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return dta;
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}
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/*
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* dos findnext
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*/
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DTA *
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findnext(dta)
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DTA *dta;
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{
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union REGS r;
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DTA far *dtasave;
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dtasave = _getsetdta((DTA far *)dta);
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/* do directory lookup */
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r.h.ah = 0x4f;
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intdos(&r, &r);
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/* restore old dta */
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_getsetdta(dtasave);
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find_err = r.x.ax;
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if (r.x.cflag)
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return(NULL);
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return dta;
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}
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