src/meta/sort.c

#ifndef lint
static const char       RCSid[] = "$Id: sort.c,v 1.3 2003/06/10 14:26:03 schorsch Exp $";
#endif
/*
 *   Sorting routines for meta-files
 */

#include  "paths.h"
#include  "meta.h"

#ifdef _WIN32
  #include <process.h> /* getpid() */
#endif


#define  PBSIZE  1000           /* max size of sort block */
                                /* maxalloc must be >= this */

#define  NFILES  4              /* number of sort files */


static void treemerge(int height, int nt, int nf, PLIST *pl,
                int (*pcmp)(), FILE *ofp);
static void sendsort( PLIST  *pl, int  (*pcmp)());
static void order(PRIMITIVE  *pa[], int  n, PLIST  *pl);
static char * tfname( int  lvl, int num);

/*
 *   This sort routine does a combination quicksort and
 *   n-ary mergesort
 */


void
sort(           /* sort primitives according to pcmp */
FILE  *infp,
int  (*pcmp)()          /* compares pointers to pointers to primitives! */
)
{
 PRIMITIVE  *prims[PBSIZE];             /* pointers to primitives */
 PLIST  primlist;                       /* our primitives list */
 int  nprims;
 short  done;

 do  {

    for (nprims = 0; nprims < PBSIZE; nprims++)  {      /* read to global */

       if ((prims[nprims] = palloc()) == NULL)
          error(SYSTEM, "memory exhausted in sort");

       readp(prims[nprims], infp);

       if (isglob(prims[nprims]->com))
          break;
       }

        qsort(prims, nprims, sizeof(*prims), pcmp);     /* sort pointer array */

        if (nprims < PBSIZE)                    /* tack on global if one */
            nprims++;

        order(prims, nprims, &primlist);        /* make array into list */

        sendsort(&primlist, pcmp);              /* send to merge sorter */

        done = primlist.pbot->com == PEOF;

        plfree(&primlist);                      /* free up array */

    }  while (!done);

 }


/*
 *  The following routine merges up to NFILES sorted primitive files
 *     with 0 or 1 primitive lists.  Each set of primitives can end with
 *     0 or 1 global commands.
 */

void
mergesort(      /* merge sorted files with list */

FILE  *fi[],            /* array of input files */
int  nf,                /* number of input files */
PLIST  *pl,             /* sorted list */
int  (*pcmp)(),         /* comparison function, takes primitive handles */
FILE  *ofp              /* output file */
)
{
    PRIMITIVE  *plp;            /* position in list */
    PRIMITIVE  *pp[NFILES];     /* input primitives */
    int  minf;
    PRIMITIVE  *minp;
    register int i;

    if (pl == NULL)
        plp = NULL;                     /* initialize list */
    else
        plp = pl->ptop;

    for (i = 0; i < nf; i++) {          /* initialize input files */
        if ((pp[i] = palloc()) == NULL)
            error(SYSTEM, "memory exhausted in mergesort");
        readp(pp[i], fi[i]);
    }

    for ( ; ; ) {

        if (plp != NULL && isprim(plp->com))
            minp = plp;
        else
            minp = NULL;

        for (i = 0; i < nf; i++)
            if (isprim(pp[i]->com) &&
                        (minp == NULL || (*pcmp)(&pp[i], &minp) < 0))
                minp = pp[minf=i];

        if (minp == NULL)
            break;

        writep(minp, ofp);

        if (minp == plp)
            plp = plp->pnext;
        else {
            fargs(pp[minf]);
            readp(pp[minf], fi[minf]);
        }
    }

    if (plp != NULL && plp->com != PEOF)
        writep(plp, ofp);

    for (i = 0; i < nf; i++) {
        if (pp[i]->com != PEOF)
            writep(pp[i], ofp);
        pfree(pp[i]);
    }

}


static void
treemerge(      /* merge into one file */

int  height, int nt, int nf,
PLIST  *pl,
int  (*pcmp)(),
FILE  *ofp
)
{
    FILE  *fi[NFILES], *fp;
    int  i;
    
    if (nf <= NFILES) {

        for (i = 0; i < nf; i++)
            fi[i] = efopen(tfname(height, i + nt*NFILES), "r");
        
        if ((fp = ofp) == NULL)
            fp = efopen(tfname(height + 1, nt), "w");
        
        mergesort(fi, nf, pl, pcmp, fp);
        
        for (i = 0; i < nf; i++) {
            fclose(fi[i]);
            unlink(tfname(height, i + nt*NFILES));
        }
        if (ofp == NULL) {
            writeof(fp);
            fclose(fp);
        }
        
    } else {
    
        for (i = 0; i < (nf-1)/NFILES; i++)
            treemerge(height, i, NFILES, NULL, pcmp, NULL);
            
        treemerge(height, (nf-1)/NFILES, (nf-1)%NFILES + 1, pl, pcmp, NULL);

        treemerge(height + 1, 0, (nf-1)/NFILES + 1, NULL, pcmp, ofp);
            
    }

}


static void
sendsort(               /* send a sorted list */

PLIST  *pl,
int  (*pcmp)()
)
{
    static int  nf = 0,
                intree = FALSE;
    FILE  *fp;

    if (isglob(pl->pbot->com)) {

                                        /* send sorted output to stdout */
        if (intree && nf <= NFILES)

            treemerge(0, 0, nf, pl, pcmp, stdout);

        else if (nf%NFILES == 0)

            if (intree) {
                treemerge(0, nf/NFILES - 1, NFILES, pl, pcmp, NULL);
                treemerge(1, 0, nf/NFILES, NULL, pcmp, stdout);
            } else
                treemerge(1, 0, nf/NFILES, pl, pcmp, stdout);

        else {

            treemerge(0, nf/NFILES, nf%NFILES, pl, pcmp, NULL);
            treemerge(1, 0, nf/NFILES + 1, NULL, pcmp, stdout);

        }

        nf = 0;                         /* all done */
        intree = FALSE;                 /* reset for next time */
        
    } else if (intree && nf%NFILES == 0) {

                                        /* merge NFILES with list */
        treemerge(0, nf/NFILES - 1, NFILES, pl, pcmp, NULL);
        intree = FALSE;

    } else {

                                        /* output straight to temp file */
        treemerge(-1, nf++, 0, pl, pcmp, NULL);
        intree = TRUE;

    }


}


static void
order(  /* order the first n array primitives into list */

PRIMITIVE  *pa[],
int  n,
PLIST  *pl
)
{
 register int  i;

 for (i = 1; i < n; i++)
    pa[i-1]->pnext = pa[i];

 pa[n-1]->pnext = NULL;
 pl->ptop = pa[0];
 pl->pbot = pa[n-1];

 }


static char *
tfname(         /* create temporary file name */

int  lvl, int num
)
{
        static char  pathbuf[PATH_MAX];
    static char  fnbuf[PATH_MAX];
        static size_t psiz;

        if (pathbuf[0] == '\0') { /* first time */
                temp_directory(pathbuf, sizeof(pathbuf));
                psiz = strlen(pathbuf);
        }
        snprintf(fnbuf, sizeof(pathbuf)-psiz,
                        "%s/S%d%c%d", pathbuf, getpid(), lvl+'A', num);
    /*sprintf(fnbuf, "%sS%d%c%d", TDIR, getpid(), lvl+'A', num);*/

    return(fnbuf);
}
Revision:	1.4
Committed:	Tue Jun 10 14:51:15 2003 UTC (20 years, 10 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+2 -2 lines
Log Message:	stupid typo.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	1.4	static const char RCSid[] = "$Id: sort.c,v 1.3 2003/06/10 14:26:03 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* Sorting routines for meta-files
6			*/
7
8	schorsch	1.2	#include "paths.h"
9			#include "meta.h"
10
11	schorsch	1.3	#ifdef _WIN32
12			#include <process.h> /* getpid() */
13			#endif
14
15	greg	1.1
16			#define PBSIZE 1000 /* max size of sort block */
17			/* maxalloc must be >= this */
18
19			#define NFILES 4 /* number of sort files */
20
21
22	schorsch	1.2	static void treemerge(int height, int nt, int nf, PLIST *pl,
23			int (pcmp)(), FILE ofp);
24			static void sendsort( PLIST pl, int (pcmp)());
25			static void order(PRIMITIVE pa[], int n, PLIST pl);
26			static char * tfname( int lvl, int num);
27	greg	1.1
28			/*
29			* This sort routine does a combination quicksort and
30			* n-ary mergesort
31			*/
32
33
34	schorsch	1.2	void
35			sort( /* sort primitives according to pcmp */
36			FILE *infp,
37			int (pcmp)() / compares pointers to pointers to primitives! */
38			)
39	greg	1.1	{
40			PRIMITIVE prims[PBSIZE]; / pointers to primitives */
41			PLIST primlist; /* our primitives list */
42			int nprims;
43			short done;
44
45			do {
46
47			for (nprims = 0; nprims < PBSIZE; nprims++) { /* read to global */
48
49			if ((prims[nprims] = palloc()) == NULL)
50			error(SYSTEM, "memory exhausted in sort");
51
52			readp(prims[nprims], infp);
53
54			if (isglob(prims[nprims]->com))
55			break;
56			}
57
58			qsort(prims, nprims, sizeof(prims), pcmp); / sort pointer array */
59
60			if (nprims < PBSIZE) /* tack on global if one */
61			nprims++;
62
63			order(prims, nprims, &primlist); /* make array into list */
64
65			sendsort(&primlist, pcmp); /* send to merge sorter */
66
67			done = primlist.pbot->com == PEOF;
68
69			plfree(&primlist); /* free up array */
70
71			} while (!done);
72
73			}
74
75
76
77
78
79			/*
80			* The following routine merges up to NFILES sorted primitive files
81			* with 0 or 1 primitive lists. Each set of primitives can end with
82			* 0 or 1 global commands.
83			*/
84
85	schorsch	1.2	void
86			mergesort( /* merge sorted files with list */
87	greg	1.1
88	schorsch	1.2	FILE fi[], / array of input files */
89			int nf, /* number of input files */
90			PLIST pl, / sorted list */
91			int (pcmp)(), / comparison function, takes primitive handles */
92			FILE ofp / output file */
93			)
94	greg	1.1	{
95			PRIMITIVE plp; / position in list */
96			PRIMITIVE pp[NFILES]; / input primitives */
97			int minf;
98			PRIMITIVE *minp;
99			register int i;
100
101			if (pl == NULL)
102			plp = NULL; /* initialize list */
103			else
104			plp = pl->ptop;
105
106			for (i = 0; i < nf; i++) { /* initialize input files */
107			if ((pp[i] = palloc()) == NULL)
108			error(SYSTEM, "memory exhausted in mergesort");
109			readp(pp[i], fi[i]);
110			}
111
112			for ( ; ; ) {
113
114			if (plp != NULL && isprim(plp->com))
115			minp = plp;
116			else
117			minp = NULL;
118
119			for (i = 0; i < nf; i++)
120			if (isprim(pp[i]->com) &&
121			(minp == NULL \|\| (*pcmp)(&pp[i], &minp) < 0))
122			minp = pp[minf=i];
123
124			if (minp == NULL)
125			break;
126
127			writep(minp, ofp);
128
129			if (minp == plp)
130			plp = plp->pnext;
131			else {
132			fargs(pp[minf]);
133			readp(pp[minf], fi[minf]);
134			}
135			}
136
137			if (plp != NULL && plp->com != PEOF)
138			writep(plp, ofp);
139
140			for (i = 0; i < nf; i++) {
141			if (pp[i]->com != PEOF)
142			writep(pp[i], ofp);
143			pfree(pp[i]);
144			}
145
146			}
147
148
149
150	schorsch	1.2	static void
151			treemerge( /* merge into one file */
152	greg	1.1
153	schorsch	1.2	int height, int nt, int nf,
154			PLIST *pl,
155			int (*pcmp)(),
156			FILE *ofp
157			)
158	greg	1.1	{
159			FILE fi[NFILES], fp;
160			int i;
161
162			if (nf <= NFILES) {
163
164			for (i = 0; i < nf; i++)
165			fi[i] = efopen(tfname(height, i + nt*NFILES), "r");
166
167			if ((fp = ofp) == NULL)
168			fp = efopen(tfname(height + 1, nt), "w");
169
170			mergesort(fi, nf, pl, pcmp, fp);
171
172			for (i = 0; i < nf; i++) {
173			fclose(fi[i]);
174			unlink(tfname(height, i + nt*NFILES));
175			}
176			if (ofp == NULL) {
177			writeof(fp);
178			fclose(fp);
179			}
180
181			} else {
182
183			for (i = 0; i < (nf-1)/NFILES; i++)
184			treemerge(height, i, NFILES, NULL, pcmp, NULL);
185
186			treemerge(height, (nf-1)/NFILES, (nf-1)%NFILES + 1, pl, pcmp, NULL);
187
188			treemerge(height + 1, 0, (nf-1)/NFILES + 1, NULL, pcmp, ofp);
189
190			}
191
192			}
193
194
195
196
197	schorsch	1.2	static void
198			sendsort( /* send a sorted list */
199	greg	1.1
200	schorsch	1.2	PLIST *pl,
201			int (*pcmp)()
202			)
203	greg	1.1	{
204			static int nf = 0,
205			intree = FALSE;
206			FILE *fp;
207
208			if (isglob(pl->pbot->com)) {
209
210			/* send sorted output to stdout */
211			if (intree && nf <= NFILES)
212
213			treemerge(0, 0, nf, pl, pcmp, stdout);
214
215			else if (nf%NFILES == 0)
216
217			if (intree) {
218			treemerge(0, nf/NFILES - 1, NFILES, pl, pcmp, NULL);
219			treemerge(1, 0, nf/NFILES, NULL, pcmp, stdout);
220			} else
221			treemerge(1, 0, nf/NFILES, pl, pcmp, stdout);
222
223			else {
224
225			treemerge(0, nf/NFILES, nf%NFILES, pl, pcmp, NULL);
226			treemerge(1, 0, nf/NFILES + 1, NULL, pcmp, stdout);
227
228			}
229
230			nf = 0; /* all done */
231			intree = FALSE; /* reset for next time */
232
233			} else if (intree && nf%NFILES == 0) {
234
235			/* merge NFILES with list */
236			treemerge(0, nf/NFILES - 1, NFILES, pl, pcmp, NULL);
237			intree = FALSE;
238
239			} else {
240
241			/* output straight to temp file */
242			treemerge(-1, nf++, 0, pl, pcmp, NULL);
243			intree = TRUE;
244
245			}
246
247
248
249			}
250
251
252
253	schorsch	1.2	static void
254			order( /* order the first n array primitives into list */
255	greg	1.1
256	schorsch	1.2	PRIMITIVE *pa[],
257			int n,
258			PLIST *pl
259			)
260	greg	1.1	{
261			register int i;
262
263			for (i = 1; i < n; i++)
264			pa[i-1]->pnext = pa[i];
265
266			pa[n-1]->pnext = NULL;
267			pl->ptop = pa[0];
268			pl->pbot = pa[n-1];
269
270			}
271
272
273
274
275			static char *
276	schorsch	1.2	tfname( /* create temporary file name */
277	greg	1.1
278	schorsch	1.2	int lvl, int num
279			)
280	greg	1.1	{
281	schorsch	1.2	static char pathbuf[PATH_MAX];
282	schorsch	1.3	static char fnbuf[PATH_MAX];
283			static size_t psiz;
284	greg	1.1
285	schorsch	1.3	if (pathbuf[0] == '\0') { /* first time */
286			temp_directory(pathbuf, sizeof(pathbuf));
287			psiz = strlen(pathbuf);
288			}
289	schorsch	1.4	snprintf(fnbuf, sizeof(pathbuf)-psiz,
290	schorsch	1.3	"%s/S%d%c%d", pathbuf, getpid(), lvl+'A', num);
291	schorsch	1.2	/sprintf(fnbuf, "%sS%d%c%d", TDIR, getpid(), lvl+'A', num);/
292	greg	1.1
293	schorsch	1.3	return(fnbuf);
294	greg	1.1	}