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