89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#define BUFFER_SIZE 256
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void create_file(const char *filename) {
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FILE *file = fopen(filename, "w");
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if (file == NULL) {
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printf("Error creating file: %s\n", filename);
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exit(1);
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}
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fclose(file);
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}
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void write_to_file(const char *filename, const char *content) {
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FILE *file = fopen(filename, "w");
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if (file == NULL) {
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printf("Error opening file: %s\n", filename);
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exit(1);
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}
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fputs(content, file);
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fclose(file);
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}
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void read_from_file(const char *filename) {
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FILE *file = fopen(filename, "r");
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if (file == NULL) {
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printf("Error opening file: %s\n", filename);
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exit(1);
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}
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char ch;
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while ((ch = fgetc(file)) != EOF) {
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putchar(ch);
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}
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fclose(file);
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}
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void append_to_file(const char *filename, const char *content) {
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FILE *file = fopen(filename, "a");
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if (file == NULL) {
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printf("Error opening file: %s\n", filename);
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exit(1);
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}
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fputs(content, file);
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fclose(file);
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}
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void delete_file(const char *filename) {
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if (remove(filename) != 0) {
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printf("Error deleting file: %s\n", filename);
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exit(1);
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}
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}
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int main() {
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char filename[BUFFER_SIZE];
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char input_buffer[BUFFER_SIZE];
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memset(filename, 0, BUFFER_SIZE);
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memset(input_buffer, 0, BUFFER_SIZE);
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printf("Enter the filename: ");
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// last byte can be non-zero -> leak
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fgets(filename, BUFFER_SIZE, stdin);
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create_file(filename);
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printf("Enter content to write to the file: ");
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fgets(input_buffer, BUFFER_SIZE, stdin);
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write_to_file(filename, input_buffer);
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printf("Content of the file:\n");
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read_from_file(filename);
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printf("\nEnter content to append to the file: ");
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fgets(input_buffer, BUFFER_SIZE, stdin);
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append_to_file(filename, input_buffer);
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printf("\nContent of the file after appending:\n");
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read_from_file(filename);
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delete_file(filename);
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return 0;
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}
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