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Annotation of 43BSD/contrib/notes/src/pagein.c, revision 1.1.1.1

1.1       root        1: #include "parms.h"
                      2: #include "structs.h"
                      3: 
                      4: #ifdef RCSIDENT
                      5: static char rcsid[] = "$Header: pagein.c,v 1.7 85/01/18 15:33:36 notes Rel $";
                      6: #endif RCSIDENT
                      7: 
                      8: /*
                      9:  *     pagein(zfile, where)
                     10:  *     FILE *zfile; struct daddr_f *where;
                     11:  *
                     12:  *     reads in a single 'page' as defined by the notesfile system and
                     13:  *     returns the count of characters moved.
                     14:  *
                     15:  *     Original Coding:        Ray Essick      Long agao
                     16:  *             moved out of gtext.c and mult.c and others   4/5/82
                     17:  *     Converted for infinite size notes       RBE 5/8/82
                     18:  *
                     19:  */
                     20: 
                     21: long    pagein (io, zfile, where)
                     22: struct io_f *io;
                     23: FILE * zfile;
                     24: struct daddr_f *where;
                     25: {
                     26: 
                     27:     register int    c;
                     28:     register int    i;
                     29:     register long   nchars;
                     30:     register long   ignored;                           /* number ignored */
                     31:     register int    ignoring;                          /* whether ignoring */
                     32:     struct daddr_f  nwhere;
                     33:     struct txtbuf_f buf;                               /* hold text */
                     34: 
                     35:     locknf (io, TXTLOCK);                              /* CRITICAL */
                     36:     x (lseek (io -> fidtxt, 0L, 0) < 0, "pagein: bad seek 0");
                     37:     x (read (io -> fidtxt, where, sizeof *where) < 0, "pagein: read 0");
                     38:     x (lseek (io -> fidtxt, where -> addr, 0) < 0,
                     39:            "pagein: bad seek 1");
                     40: 
                     41:     where -> textlen = 0;                              /* no text yet */
                     42:     nchars = 0;
                     43:     i = 0;
                     44:     ignoring = 0;                                      /* save em for now */
                     45:     ignored = 0;
                     46:     while ((c = getc (zfile)) != EOF)                  /* grab input */
                     47:     {
                     48:        if (!ignoring)
                     49:        {
                     50:            if (i == BUFSIZE)                           /* flush full buffer */
                     51:            {
                     52:                x (write (io -> fidtxt, buf.txtbuf, BUFSIZE) != BUFSIZE, "pagein: bad text");
                     53:                i = 0;                                  /* reset buffer */
                     54:            }
                     55:            buf.txtbuf[i++] = c;
                     56:            if (++nchars >= io -> descr.d_longnote)     /* count characters */
                     57:            {
                     58:                ignoring++;                             /* don't add any more */
                     59:            }
                     60:        }
                     61:        else                                            /* ignoring */
                     62:        {
                     63:            ignored++;
                     64:        }
                     65:     }
                     66:     if (i != 0)                                                /* if we've got some */
                     67:        x (write (io -> fidtxt, buf.txtbuf, i) != i, "pagein: bad text");
                     68:     if (ignored)                                       /* write warning */
                     69:     {
                     70:        sprintf (buf.txtbuf, "\n\n%s ignored %ld excess bytes\n",
                     71:                System, ignored);
                     72:        i = strlen (buf.txtbuf);                        /* get length */
                     73:        x (write (io -> fidtxt, buf.txtbuf, i) != i, "pagein: bad text");
                     74:        nchars += i;                                    /* count extras */
                     75:     }
                     76: /*
                     77:  *     fix count in the header
                     78:  */
                     79:     where -> textlen = nchars;                         /* fill header */
                     80: /*
                     81:  *     fix free pointer
                     82:  */
                     83:     x (lseek (io -> fidtxt, 0l, 0) < 0, "pagein:bad reseek");
                     84:     nwhere.addr = where -> addr + nchars;
                     85:     if (nwhere.addr & 1)                               /* odd?? */
                     86:        nwhere.addr++;                                  /* round to word boundary */
                     87:     x (write (io -> fidtxt, &nwhere, sizeof nwhere) != sizeof nwhere, "pagein: badupdate");
                     88: 
                     89:     unlocknf (io, TXTLOCK);
                     90:     return ((long) nchars);
                     91: }

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