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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. typedef struct {
  6.   char *str;
  7. } StringBuilder;
  8.  
  9. void append(StringBuilder *sb, const char *str) {
  10.     if (!str) return;
  11.  
  12.     const size_t len = sb->str ? strlen(sb->str) : 0;
  13.     char *newstr = (char *) realloc(sb->str, len + strlen(str) + 1);
  14.     if (newstr) {
  15.         sb->str = newstr;
  16.         strcpy(newstr + len, str);
  17.     }
  18. }
  19.  
  20. void setLength(StringBuilder *sb, size_t n) {
  21.     char *newstr = (char *) realloc(sb->str, n + 1);
  22.     if (newstr) {
  23.         sb->str = newstr;
  24.         sb->str[n] = '\0';
  25.     }
  26. }
  27.  
  28. int main() {
  29.     StringBuilder sb = { .str = 0 };
  30.     append(&sb, "Привет америкосам");
  31.     printf("%s\n", sb.str);
  32.     append(&sb, ", я вас уделаю!");
  33.     printf("%s\n", sb.str);
  34.     setLength(&sb, 2);
  35.     printf("%s\n", sb.str);
  36.     setLength(&sb, 0);
  37.     printf("%s\n", sb.str);
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 9416KB
comments (?)
stdin 
Standard input is empty
stdout 
Привет америкосам
Привет америкосам, я вас уделаю!
П
https://ideone.com/5tJQn1
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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