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Annotation of 43BSD/usr.lib/libpc/READ4.c, revision 1.1.1.1

1.1       root        1: /* Copyright (c) 1979 Regents of the University of California */
                      2: 
                      3: static char sccsid[] = "@(#)READ4.c 1.8 10/28/83";
                      4: 
                      5: #include "h00vars.h"
                      6: #include <errno.h>
                      7: extern int errno;
                      8: 
                      9: long
                     10: READ4(curfile)
                     11: 
                     12:        register struct iorec   *curfile;
                     13: {
                     14:        long                    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, "%ld", &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 integer read\n", curfile->pfname);
                     31:                return;
                     32:        }
                     33:        if (errno == ERANGE) {
                     34:                ERROR("%s: Overflow on integer read\n", curfile->pfname);
                     35:                return;
                     36:        }
                     37:        if (errno != 0) {
                     38:                PERROR("Error encountered on integer read ", curfile->pfname);
                     39:                return;
                     40:        }
                     41:        return data;
                     42: }

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