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memset.c (639B)

      1 /* SPDX-header:  */
      2 
      3 #include "../stdint.h"
      4 #include "string.h"
      5 
      6 
      7 void *memset (void *ptr, int x, size_t n) {
      8 
      9     unsigned char *p = (unsigned char *)ptr;
     10 
     11     size_t i = 0; // initialize i to the beginning as a counter
     12     while (1) {
     13 
     14         if (i == n) { // check if i == n that means loop has completed filling "n" bytes of p with x
     15             break;
     16         }
     17 
     18         *p = (unsigned char)x; // dereference 'p' and set it to 'x' by casting the int x to a char
     19 
     20         p++; // increment address of pointer by one byte
     21         i++; // increment i to move for next 'n' byte
     22     }
     23 
     24     return ptr; // return original pointer passed
     25 }