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Standard C Libraries
fseek (Continued)
y = fseek(myfile, -16L, SEEK_END);
if (y)
perror("Fseek failed");
else
{
fgets(s, 70, myfile);
printf("\"%s\"\n", s);
}
fclose(myfile);
}
}
Output:
"This is the beginning"
"this is the middle and this is the end."
"this is the end."
Explanation:
The file afile.out is created with the text, “This is the beginning, this
is the middle and this is the end”.
The function fseek uses an offset of zero and SEEK_SET to set the file
pointer to the beginning of the file. fgets then reads 22 characters
which are “This is the beginning”, and adds a null character to the
string.
Next, fseek uses an offset of two and SEEK_CURRENT to set the file
pointer to the current position plus two (skipping the comma and
space). fgets then reads up to the next 70 characters. The first 39
characters are “this is the middle and this is the end”. It stops when it
reads EOF and adds a null character to the string.
FInally, fseek uses an offset of negative 16 characters and SEEK_END
to set the file pointer to 16 characters from the end of the file. fgets
then reads up to 70 characters. It stops at the EOF after reading 16
characters “this is the end”. and adds a null character to the string.
fsetpos
Description:
Include:
Prototype:
Sets the stream's file position.
<stdio.h>
int fsetpos(FILE * stream , const fpos_t * pos );
Arguments:
stream
pos
to fgetpos
target stream
position-indicator storage as returned by an earlier call
Return Value:
Remarks:
? 2008 Microchip Technology Inc.
Returns 0 if successful; otherwise, returns a non-zero value.
The function sets the file-position indicator for the given stream in * pos
if successful; otherwise, fsetpos sets errno .
DS51456E-page 65
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