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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define MAX_PATH_LEN 1024
  5.  
  6. void print_menu() {
  7.   printf("1. Указать путь к текстовому файлу\n");
  8.   printf("-1. Выход\n");
  9.   printf("Выберите пункт меню: ");
  10. }
  11.  
  12. int read_line(char *buffer, size_t size) {
  13.   if (fgets(buffer, (int)size, stdin) == NULL) {
  14.     return 0;
  15.   }
  16.  
  17.   char *p = buffer;
  18.   while (*p != '\0') {
  19.     if (*p == '\n') {
  20.       *p = '\0';
  21.       break;
  22.     }
  23.     p++;
  24.   }
  25.   return 1;
  26. }
  27.  
  28. void process_file(const char *filepath) {
  29.   FILE *f = fopen(filepath, "r");
  30.   if (!f) {
  31.     printf("n/a\n");
  32.     return;
  33.   }
  34.  
  35.   int c = fgetc(f);
  36.   if (c == EOF) {
  37.     fclose(f);
  38.     printf("n/a\n");
  39.     return;
  40.   }
  41.  
  42.   putchar(c);
  43.  
  44.   while ((c = fgetc(f)) != EOF) {
  45.     putchar(c);
  46.   }
  47.   fclose(f);
  48.   putchar('\n');
  49. }
  50.  
  51. int main(void) {
  52.   char input[MAX_PATH_LEN];
  53.  
  54.   while (1) {
  55.     print_menu();
  56.     if (!read_line(input, sizeof(input))) {
  57.       break;
  58.     }
  59.  
  60.     if (input[0] == '-' && input[1] == '1' && input[2] == '\0') {
  61.       break;
  62.     }
  63.  
  64.     if (input[0] == '1' && (input[1] == ' ' || input[1] == '\t')) {
  65.       char *path = input + 2;
  66.       while (*path == ' ' || *path == '\t')
  67.         path++;
  68.       if (*path == '\0') {
  69.         printf("n/a\n");
  70.         continue;
  71.       }
  72.       process_file(path);
  73.       continue;
  74.     }
  75.  
  76.     printf("n/a\n");
  77.   }
  78.  
  79.   return 0;
  80. }
  81.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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1. Указать путь к текстовому файлу
-1. Выход
Выберите пункт меню:
https://ideone.com/vaqN9Z
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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