I'm having some problems with this little function that can read a file:
void ReadFile(char *name) {
FILE *fr;
int lenght, i;
fr = fopen(name, "r"); //Open the file reader
fseek(fr, 0, 2); //Set the pointer at the EOF
lenght = ftell(fr); //Read the ending position
printf("\nDEBUG lenght:%d\n", lenght);
fseek(fr, 0, 0); //Return at the beginning of the file
printf("File read:\n\n");
for (i = 1; i <= lenght; i++) {
printf("%c", getc(fr));
fseek(fr, i, 0);
}
fclose(fr);
}
This is the file that it reads:
qwerty
asdfgh
zxcvbn
But this is the output of the program:
DEBUG lenght:24
File read:
qwerty
asdfgh
zxcvbn
It is basically reading an extra "\n" when there is one before.
Any ideas of why the code doesn't work?
Thanks
If you open a file in text mode (as you do), then a call to fseek may only contain offset values that have been previously retrieved by an ftell function (cf, for example, cppreference/fseek):
If the stream is open in text mode, the only supported values for offset are zero (which works with any origin) and a value returned by an earlier call to ftell on a stream associated with the same file (which only works with origin of SEEK_SET).
In your for-loop, however, you are passing the value of i, which is not retrieved by ftell.
Besides that, your fseek in the loop is superflous, as fgetc moves the read pointer forward anyway. So for (i = 1; i <= lenght; i++) { printf("%c", getc(fr)); } should do the job.