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- /*
- * doustat - the heart of spacefor.ustat
- */
-
- #include <stdio.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <ustat.h>
-
- extern int debug;
-
- extern void error(), exit();
-
- /*
- - process - do the work
- */
- long
- process(filesize, fileonfs, wantspace, wantinodes, bperi)
- long filesize;
- char *fileonfs;
- long wantspace;
- long wantinodes;
- long bperi;
- {
- struct stat silly;
- struct ustat info;
- register long n;
- # define LOTS 10000
- #ifndef USTATBS
- # define USTATBS (512)
- #endif
- register long iperfile = filesize/bperi + 1;
-
- if (stat(fileonfs, &silly) < 0)
- error("cannot do stat(%s)", fileonfs);
- if (ustat(silly.st_dev, &info) < 0)
- error("cannot do ustat(%s)", fileonfs);
- if (debug)
- fprintf(stderr, "bsize %ld, avail %ld, inodes %ld\n",
- USTATBS, info.f_tfree, (long)info.f_tinode);
-
- n = LOTS;
- if (info.f_tfree <= wantspace)
- n = 0;
- else if (USTATBS > 0 && filesize > 0)
- n = (info.f_tfree - wantspace) / (filesize/USTATBS + 1);
-
- if (info.f_tinode < 0) /* information unavailable */
- ; /* bypass check, and pray */
- else if (info.f_tinode <= wantinodes)
- n = 0;
- else if ((info.f_tinode - wantinodes) / iperfile < n)
- n = (info.f_tinode - wantinodes) / iperfile;
-
- if (n < 0)
- n = 0;
- else if (n > LOTS)
- n = LOTS; /* to avert 16-bit trouble elsewhere */
-
- return(n);
- }
-