03-26-2008
Quote:
char data[80];
long cur_pos;
while( feof(fh) == 0){
cur_pos = ftell(fh);
printf( "cur_cursor = %ld \n", cur_pos);
fgets(data, 80, fh);
}
A simple change to this code may work:
char data[80];
int ct_str_length;
long new_byte_position;
long cur_pos;
while( feof(fh) == 0){
cur_pos = ftell(fh);
printf( "cur_cursor = %ld \n", cur_pos);
fgets(data, 80, fh);
ct_str_length=strlen(data);
new_byte_position=ct_str_length+1;
printf("new_byte_position or cursor position is %ld" ,new_byte_position);
fseek(fh,new_byte_position,SEEKSET);
}
we know that fgets() stops once it reaches newline characte/EOF.
Till EO of file is reached(feof(fp)==0), with the curent byte position as 0th byte or first byte of first line, we are reading the first line by fgets() till newline characte is reached. Once \n is reached, fgets() tops its function and the ead content is stored in data array. the string length in this aray is the total number of characters/bytes in first line. So adding 1 byte more than that, now the current byte position becomes the beginning byte of the next line. Check this.
-Ramkrix
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FGETS(3) BSD Library Functions Manual FGETS(3)
NAME
fgets, gets -- get a line from a stream
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
char *
fgets(char * restrict str, int size, FILE * restrict stream);
char *
gets(char *str);
DESCRIPTION
The fgets() function reads at most one less than the number of characters specified by size from the given stream and stores them in the
string str. Reading stops when a newline character is found, at end-of-file or error. The newline, if any, is retained. If any characters
are read and there is no error, a '