fseek function
| Prototype | <![CDATA[ int fseek (FILE * Stream, long int Offset, int Reference);]]> |
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| Purpose | To position the file pointer to a specified location |
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| Header File | #include <stdio.h> |
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| Parameters |
| Stream | Pointer to an open FILE |
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| Offset | Byte count from Reference |
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| Reference |
| SEEK_SET | Beginning of file |
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| SEEK_CUR | Beginning of file |
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| SEEK_END | End of file |
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| Return Value |
| 0 | Success |
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| EBADF | Bad file pointer |
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| EINVAL | Invalid argument |
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| ESPIPE | Illegal seek on device |
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- These error number constants are defined in errno.h.
- With streams not capable of seeking, the return value is undefined
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| Notes |
- fseek wipes out any previous ungetc.
- for a stream opened in text mode, fseek may not function as expected
unless positions returned by ftell are used.
- fseek clears end-of-file.
- The position specified can be beyond the end of the file.
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| Example | <![CDATA[
#include <stdio.h>
. . .
FILE * Account_Master;
long int Record_Number;
int LRecl;
. . .
if (fseek (Account_Master, Record_Number * LRecl, SEEK_SET) == 0)
printf ("Seek succeeded.");
else
printf ("Seek failed.");]]> |
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| Related functions |
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