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7.8

how to free pointer after doing pointer-arithmetic?

Asked by gcssolve in C Programming Language

Tags: free, programming

If you move the char-pointer as done in the code below how would you free the memory originally assigned to the pointer? The call to the free-function makes the program crash.

regards,
Thorbjørn


#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>


int main(void)
{
   FILE *fhin;
   char *LinePtr;
   char line[1024];

   while (1) {
      if (!(fhin = fopen("/tmp/testfile", "r"))) {
         printf("error");
         exit(0);
      }

      while (fgets(line, sizeof(line), fhin) != NULL) {
         printf("got line %s\n", line);
         LinePtr = (char *) calloc(sizeof(line), sizeof(char));
         strcpy(LinePtr, line);
         *LinePtr++;
         free(LinePtr);

      }
      fclose(fhin);
      sleep(5);
   }
}
 
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Zone: C Programming Language
Tags: free, programming
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Solution Provided By: Axter
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Solution Grade: A
 
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