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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define BUFFER 65
  6. #define PROC_STR(pstr) if((pstr[strlen((pstr)) - 1]) == '\n') (pstr[strlen((pstr)) - 1]) = '\0'
  7. #define PROC_STR1(pstr) strcspn(pstr, "\n") = 0
  8.  
  9. typedef struct blck{
  10.     char string[BUFFER];
  11.  
  12.     struct blck *prev;
  13.     struct blck *next;
  14. }Block;
  15.  
  16. typedef struct blkch{
  17.     long unsigned int len;
  18.  
  19.     Block *gen;
  20.     Block *tail;
  21. }BlockChain;
  22.  
  23. /* Create the list */
  24. BlockChain *createBlockChain(){
  25.     BlockChain *newChain = calloc(1, sizeof(BlockChain));
  26.  
  27.     newChain->gen = NULL;
  28.     newChain->tail = NULL;
  29.     newChain->len = 0;
  30.  
  31.     return newChain;
  32. }
  33.  
  34. /* Create a node */
  35. Block *createBlock(char *pstring){
  36.     Block *newBlock = calloc(1, sizeof(Block));
  37.  
  38.     strcpy(newBlock->string, pstring);
  39.  
  40.     return newBlock;
  41. }
  42.  
  43. /* Append Block to the list*/
  44. BlockChain *appendToChain(BlockChain *pChain, char *pstring){
  45.     Block *newBlock = createBlock(pstring);
  46.  
  47.     newBlock->prev = pChain->tail;
  48.     newBlock->next = NULL;
  49.     if(pChain->tail != NULL)
  50.         pChain->tail->next = newBlock;
  51.     pChain->tail = newBlock;
  52.     if(pChain->gen == NULL)
  53.         pChain->gen = newBlock;
  54.     pChain->len++;
  55.  
  56.     return pChain;
  57. }
  58.  
  59. void printBlock(Block *pblock){
  60.     printf("String: %s\n", pblock->string);
  61.     printf("Prev: %p\n", (void *) pblock->prev);
  62.     printf("Cur: %p\n", (void *) pblock);
  63.     printf("Next: %p\n", (void *) pblock->next);
  64. }
  65.  
  66. void printChain(Block *pgen){
  67.     Block *tmp = pgen;
  68.  
  69.     while(tmp != NULL){
  70.         printBlock(tmp);
  71.         tmp = tmp->next;
  72.     }
  73. }
  74.  
  75. int main(void){
  76.     BlockChain *myChain = createBlockChain();
  77.  
  78.     appendToChain(myChain, "Hello1");
  79.     appendToChain(myChain, "Hello2");
  80.     printChain(myChain->gen);
  81.     free(myChain);
  82.     return 0;
  83. }
Compilation error #stdin compilation error #stdout 0s 4392KB
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stdin
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Standard input is empty
compilation info 
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/iRDHkS
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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