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Annotation of 42BSD/usr.lib/libpc/READ8.c, revision 1.1.1.1

1.1       root        1: /* Copyright (c) 1979 Regents of the University of California */
                      2: 
                      3: static char sccsid[] = "@(#)READ8.c 1.5 4/9/82";
                      4: 
                      5: #include "h00vars.h"
                      6: #include <errno.h>
                      7: extern int errno;
                      8: 
                      9: double
                     10: READ8(curfile)
                     11: 
                     12:        register struct iorec   *curfile;
                     13: {
                     14:        double                  data;
                     15:        int                     retval;
                     16: 
                     17:        if (curfile->funit & FWRITE) {
                     18:                ERROR("%s: Attempt to read, but open for writing\n",
                     19:                        curfile->pfname);
                     20:                return;
                     21:        }
                     22:        UNSYNC(curfile);
                     23:        errno = 0;
                     24:        retval = fscanf(curfile->fbuf, "%lf", &data);
                     25:        if (retval == EOF) {
                     26:                ERROR("%s: Tried to read past end of file\n", curfile->pfname);
                     27:                return;
                     28:        }
                     29:        if (retval == 0) {
                     30:                ERROR("%s: Bad data found on real read\n", curfile->pfname);
                     31:                return;
                     32:        }
                     33:        if (errno == ERANGE) {
                     34:                if (data == 0.0)
                     35:                        ERROR("%s: Underflow on real read\n", curfile->pfname);
                     36:                else
                     37:                        ERROR("%s: Overflow on real read\n", curfile->pfname);
                     38:                return;
                     39:        }
                     40:        if (errno != 0) {
                     41:                PERROR(curfile->pfname);
                     42:                return;
                     43:        }
                     44:        curfile->funit &= ~EOLN;
                     45:        curfile->funit |= SYNC;
                     46:        return data;
                     47: }

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