ftell function
| Prototype | <![CDATA[ long int ftell (FILE * Stream);]]> |
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| Purpose | To get the location of a file pointer. |
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| Header File | #include <stdio.h> |
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| Parameters |
| Stream | Pointer to an open FILE |
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| Return Value | |
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| Side Effects |
| errno | Set on failure to:
| EBADF | Bad file pointer |
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| ESPIPE | Illegal seek on device |
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- These error number constants and the variable errno
are defined in errno.h.
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| Notes |
- File pointer position returned is bytes from the beginning of the file.
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| Example | <![CDATA[
#include <stdio.h>
#include <errno.h>
. . .
FILE * Account_Master;
long int File_Size;
. . .
if (fseek (Account_Master, 0, SEEK_END) == 0) {
File_Size = ftell (Account_Master);
if (File_Size >= 0)
printf ("File is %i bytes long.", File_Size);
else
printf ("Function ftell failed with error %i.", errno);
} else {
printf ("Seek failed.");
}]]> |
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| Related functions |
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