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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <ctype.h>
  5.  
  6. char charheap[32];
  7.  
  8. char *char_alloc(int s) {
  9.  int len = 32;
  10.   for (int i = 0; i < len; i++) {
  11.   if (charheap[0] == '\0') {
  12.    //char a = charheap[0];
  13.    return charheap;
  14.  } else if (charheap[i] == '\0') {
  15.    //char b = charheap[i+1];
  16.    return &charheap[i+1];
  17.   }
  18.  }
  19.  return NULL;
  20. }
  21.  
  22. void arr_print () {
  23.     for (char *p = charheap; p < charheap + sizeof(charheap); ++p) {
  24.         if (isprint(*p)) putchar(*p);
  25.         else putchar('\\');
  26.     }
  27.     putchar('\n');
  28. }
  29.  
  30.  char *alloc_and_print(int s, const char *cpy) {
  31.    char *ncb = char_alloc(s);// allocate the next contiguous block
  32.    if (ncb == NULL) {
  33.     printf("Failed\n");
  34.    } else {
  35.     strcpy(ncb, cpy);
  36.     arr_print();// print the array
  37.   }
  38.   return ncb;
  39.  }
  40.  
  41. int main(void) {
  42.    char *str1 = alloc_and_print(5,  "hello");
  43.    char *str2 = alloc_and_print(5,  "brian");
  44.    puts(str1);
  45.    puts(str2);
  46.  }
  47.  
Success #stdin #stdout 0s 1832KB
comments (?)
stdin
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Standard input is empty
stdout
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hello\\\\\\\\\\\\\\\\\\\\\\\\\\\
hello\brian\\\\\\\\\\\\\\\\\\\\\
hello
brian
https://ideone.com/BrrHUh
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
public

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