C Programming - Difficulty with Parsing a Temp Folder - c

Question

I'm having some trouble with parsing a temp.txt folder which contains the basenames of various files in a directory. I'd like to sort through this file, figure out what each of the file types are line by line, and then delete them from the temp file. I have been able to do carry out the parsing of the file names to discover their type, but when I call my delete function... it only works for some of the files and leaves behind some junk occasionally.
The input file looks like this:
temp.txt input
The output file after running looks like this:
temp.txt output
#include < stdio.h >
#include < string.h >
#include < unistd.h >
#include < stdlib.h >
/* This program module parses through the temp.txt file and finds .gif, .png, and .bmp files
and prints to standard output their file type in the order in which they're found.
It also takes all the files that aren't of those three types and puts them in a junk file.
*/
int deleteline(int delete_line);
int main(int argc, char * argv[]) {
FILE * file = fopen("temp.txt", "r"); /* should check the result */
FILE * myfile = fopen("junkfiles.txt", "w");
char line[4069];
char * gif = ".gif";
char * png = ".png";
char * bmp = ".bmp";
int i = 0;
int j = 0;
// if tempfile cannot be created, error handle
if (!file) {
puts("Some kind of file error!");
return 1;
}
// if junkfile cannot be created, error handle
if (!myfile) {
puts("Some kind of file error!");
return 1;
}
while (fgets(line, sizeof(line), file)) {
i++;
if (strstr(line, gif) != NULL) {
j = deleteline(i);
fflush(NULL);
if (j == 0) {
printf("File on line %d is: ", i);
puts(line);
printf("This is a .gif\n\n");
} else {
printf("Some error on line %d\n", i);
}
} else if (strstr(line, png) != NULL) {
j = deleteline(i);
if (j == 0) {
printf("File on line %d is: ", i);
puts(line);
printf("This is a .png\n\n");
} else {
printf("Some error on line %d\n", i);
}
} else if (strstr(line, bmp) != NULL) {
j = deleteline(i);
if (j == 0) {
printf("File on line %d is: ", i);
puts(line);
printf("This is a .bmp\n\n");
} else {
printf("Some error on line %d\n", i);
}
} else {
j = deleteline(i);
if (j == 0) {
printf("The file on line %d is junk.\n\n", i);
} else {
printf("Some error on line %d\n\n", i);
}
fprintf(myfile, "%s", line);
}
}
/* may check feof here to make a difference between eof and io failure -- network
timeout for instance */
fclose(file);
fclose(myfile);
fflush(NULL);
return 0;
}
int deleteline(int delete_line) {
FILE * fileptr1, * fileptr2;
char * filename = "temp.txt";
char ch;
int temp = 1;
//open file in read mode
fileptr1 = fopen(filename, "r");
ch = getc(fileptr1);
//rewind
rewind(fileptr1);
//open new file in write mode
fileptr2 = fopen("replica.txt", "w");
while (ch != EOF) {
ch = getc(fileptr1);
if (ch == '\n')
temp++;
//except the line to be deleted
if (temp != delete_line) {
//copy all lines in file replica.c
putc(ch, fileptr2);
}
}
fclose(fileptr1);
fclose(fileptr2);
remove(filename);
//rename the file replica.c to original name
rename("replica.txt", filename);
return 0;
}