1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
/* return number of bytes read, throw string on error */
#ifndef CPPFILEUTIL_H
#define CPPFILEUTIL_H
#include "stringutil.h"
template <class W>
u_int32_t fread_loop(FILE *theFile, u_int32_t elems2Read, W *bufp) {
u_int32_t totalRead = fread(bufp, sizeof(W), elems2Read, theFile);
bufp += totalRead;
while (elems2Read > totalRead) {
u_int32_t numread = fread(bufp+numread, sizeof(W), elems2Read - totalRead, theFile);
if (!numread) {
string errstring = string("Data read failed after ") +
doubleToString(totalRead+numread) +
"bytes: ";
int err = ferror(theFile);
if (err) throw errstring + "error "+doubleToString(err);
if (feof(theFile)) throw errstring + "unexpected EOF";
else throw errstring + "zero items read, but no error or EOF (impossible!)";
}
bufp += numread;
totalRead += numread;
}
return totalRead;
}
#endif
|
