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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. struct String {
  6.     int* symbols;
  7.     int size;
  8.     int cap;
  9. };
  10.  
  11. void add_symbol(struct String* s, int symbol) {
  12.     if (s->cap <= s->size) {
  13.         s->cap = (1+s->cap)*2;
  14.         s->symbols = realloc(s->symbols, s->cap*sizeof(int));
  15.     }
  16.     s->symbols[s->size++] = symbol;
  17. }
  18.  
  19. int next_or_die(unsigned char** p) {
  20.     if (((**p) >> 6) != 0x2) {
  21.         printf("UPS\n"); exit(-1);
  22.     }
  23.     return (*((*p)++)) & 0x3f;
  24. }
  25.  
  26. struct String readline() {
  27.     struct String r;
  28.     char buf[100000];
  29.     unsigned char* p = (unsigned char*)&buf[0];
  30.     memset(&r, 0, sizeof(r));
  31.     fgets(buf, sizeof(buf), stdin);
  32.     while (*p) {
  33.         if ((*p & 0x80) == 0) {
  34.             add_symbol(&r, *p++);
  35.         } else if (((*p) >> 5) == 0x6) {
  36.             int symbol = 0;
  37.             symbol  = ((*p++) & 0x1f) << 6;
  38.             symbol |= next_or_die(&p);
  39.             add_symbol(&r, symbol);
  40.         } else if (((*p) >> 4) == 0xe) {
  41.             int symbol = 0;
  42.             symbol  = ((*p++) & 0xf)  << 12;
  43.             symbol |= next_or_die(&p) << 6;
  44.             symbol |= next_or_die(&p);
  45.             add_symbol(&r, symbol);
  46.         } else if (((*p) >> 3) == 0x1e) {
  47.             int symbol = 0;
  48.             symbol  = ((*p++) & 0x7)  << 18;
  49.             symbol |= next_or_die(&p) << 12;
  50.             symbol |= next_or_die(&p) << 6;
  51.             symbol |= next_or_die(&p);
  52.             add_symbol(&r, symbol);
  53.         }
  54.     }
  55.  
  56.     return r;
  57. };
  58.  
  59. void printline(struct String s) {
  60.     int i;
  61.     for (i = 0; i < s.size; i++) {
  62.         if (s.symbols[i] <= 0x7f) {
  63.             putchar(s.symbols[i]);
  64.         } else if (s.symbols[i] <= 0x7ff) {
  65.             putchar((s.symbols[i] >> 6)   | 0xc0);
  66.             putchar((s.symbols[i] & 0x3f) | 0x80);
  67.         } else if (s.symbols[i] <= 0xffff) {
  68.             putchar((s.symbols[i] >> 12)  | 0xe0);
  69.             putchar(((s.symbols[i] >> 6)&0x3f)| 0x80);
  70.             putchar((s.symbols[i]&0x3f)  | 0x80);
  71.         } else {
  72.             putchar((s.symbols[i] >> 18)  | 0xf0);
  73.             putchar(((s.symbols[i] >> 12)&0x3f)| 0x80);
  74.             putchar(((s.symbols[i] >> 6)&0x3f) | 0x80);
  75.             putchar((s.symbols[i]&0x3f)  | 0x80);
  76.         }
  77.     }
  78.     putchar('\n');
  79. }
  80.  
  81. int min(int a, int b) {
  82.     return a<b?a:b;
  83. }
  84.  
  85. struct String substring(struct String s, int from, int len) {
  86.     struct String r = {
  87.         s.symbols+min(s.size, from),
  88.         min(s.size, from+len)-min(s.size, from)
  89.     };
  90.     return r;
  91. }
  92.  
  93. int main() {
  94.     struct String r = readline();
  95.     printf("len=%d\n", r.size);
  96.     printline(r);
  97.     printline(substring(r, 11, 11));
  98.     free(r.symbols);
  99.     return 0;
  100. }
  101.  
Success #stdin #stdout 0s 5624KB
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stdin
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Работаем с подстроками в unicode
stdout
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len=32
Работаем с подстроками в unicode
подстроками
https://ideone.com/ByPo7v
language:
C (gcc 8.3)
created:
2 years ago
visibility:
secret

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